Catalytic Chemical Vapor Deposition Synthesis Of Carbon Nanotubes From Methane On Sio Supported Fe And Fe Ni Catalysts

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Catalytic Chemical Vapor Deposition Synthesis of Carbon Nanotubes from Methane on SiO Supported Fe and Fe-Ni Catalysts

Author : Ayako Nakagawa
Publisher :
ISBN 13 :
Total Pages : 184 pages
Book Rating : 4.:/5 (239 download)

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Book Synopsis Catalytic Chemical Vapor Deposition Synthesis of Carbon Nanotubes from Methane on SiO Supported Fe and Fe-Ni Catalysts by : Ayako Nakagawa

Download or read book Catalytic Chemical Vapor Deposition Synthesis of Carbon Nanotubes from Methane on SiO Supported Fe and Fe-Ni Catalysts written by Ayako Nakagawa and published by . This book was released on 2009 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Influences of operating conditions on the production of carbon nanotubes (CNTs) were studied using Fe and Fe-Ni bimetallic catalysts supported on silicon monoxide (SiO). The catalysts were prepared in three steps: (1) impregnation of SiO powders with ferric nitride or combinations of ferric and nickel nitrides, (2) oxidation of nitrides in an air stream, and (3) grinding the powders obtained. CNTs were successfully synthesized by catalytic CVD using NH3/CH4 mixtures in a horizontal tubular flow reactor. The following process parameters were varied to investigate their effects on the growth rates of CNTs. The morphologies of catalysts and product CNTs were observed by scanning electron microscope (SEM). The particle size of SiO, metal composition, metal loading, temperature for catalyst oxidation, extent of grinding of catalysts, NH3 pretreatment time, reaction temperature for CNT growth, reaction time, and NH3/CH4 feed ratio. Two different average sizes of SiO particles, 8 [mu]m and 44 [mu]m, were compared based on the growth of CNTs in 5 min. Catalysts supported on 44 [mu]m average sized SiO particles demonstrated higher yields when they were not pretreated in an NH3 stream. When 1 wt% Fe was loaded, aligned CNTs were formed, and a highest growth rate per unit mass of catalyst was observed. The range of oxidation temperature to achieve highest catalyst activities depended on metals and metal contents: 600 - 750°C for 1 wt% Fe, 450 - 600°C for 3 wt% Fe, and 750 - 900°C for Fe-Ni. Grinding catalysts for at least 3 minutes increased the growth rate of CNTs by approximately 40 percent. The growth of CNTs was enhanced when no NH3 pretreatment of catalysts was carried out, regardless of metals and metal contents. However, CNTs did not grow appreciably from methane without ammonia. An NH3/CH4 feed ratio of 0.15 - 0.25 was observed to yield highest growth rates. The reaction temperature to achieve highest CNT growth rates was found to be in the range between 990 and 1000 °C. The growth of CNTs was not linear but decreased with reaction time.

Perspective of Carbon Nanotubes

Author : Hosam El-Din Saleh
Publisher : BoD – Books on Demand
ISBN 13 : 1789844010
Total Pages : 250 pages
Book Rating : 4.7/5 (898 download)

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Book Synopsis Perspective of Carbon Nanotubes by : Hosam El-Din Saleh

Download or read book Perspective of Carbon Nanotubes written by Hosam El-Din Saleh and published by BoD – Books on Demand. This book was released on 2019-12-11 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes belong to new nanomaterials and have been known for almost 20 years, but their history is somewhat lengthier. They have been identified as promising candidates for various applications.High-temperature preparation techniques are conventional techniques for the synthesis of carbon nanotubes using arc discharge or laser ablation, but today these methods are being replaced by low-temperature vapor deposition techniques, since orientation, alignment, nanotube length, diameter, purity, and density of carbon nanotubes can be precisely controlled. The synthesis of carbon nanotubes by chemical vapor deposition on catalyst arrays leads to nanotube models grown from specific sites on surfaces. The controlled synthesis of nanotubes opens up interesting possibilities in nanoscience and nanotechnologies, including electrical, mechanical and electromechanical properties and devices, chemical functionalization, surface chemistry and photochemistry, molecular sensors, and interfacing with moderate biological systems.Carbon nanotubes are used in many applications due to their unique electrical, mechanical, optical, thermal, and other properties. Conductive and high-strength composite materials, energy saving and energy conversion devices, sensors, visualization of field emissions and sources of radiation, means for storing hydrogen, and nanoscale semiconductor devices, probes, and interconnections are some of the many applications of carbon nanotubes.

Carbon and Oxide Nanostructures

Author : Noorhana Yahya
Publisher : Springer Science & Business Media
ISBN 13 : 3642146732
Total Pages : 413 pages
Book Rating : 4.6/5 (421 download)

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Book Synopsis Carbon and Oxide Nanostructures by : Noorhana Yahya

Download or read book Carbon and Oxide Nanostructures written by Noorhana Yahya and published by Springer Science & Business Media. This book was released on 2011-01-12 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume covers all aspects of carbon and oxide based nanostructured materials. The topics include synthesis, characterization and application of carbon-based namely carbon nanotubes, carbon nanofibres, fullerenes, carbon filled composites etc. In addition, metal oxides namely, ZnO, TiO2, Fe2O3, ferrites, garnets etc., for various applications like sensors, solar cells, transformers, antennas, catalysts, batteries, lubricants, are presented. The book also includes the modeling of oxide and carbon based nanomaterials. The book covers the topics: Synthesis, characterization and application of carbon nanotubes, carbon nanofibres, fullerenes Synthesis, characterization and application of oxide based nanomaterials. Nanostructured magnetic and electric materials and their applications. Nanostructured materials for petro-chemical industry. Oxide and carbon based thin films for electronics and sustainable energy. Theory, calculations and modeling of nanostructured materials.

The Effect of Catalyst Properties on the Synthesis of Carbon Nanotubes by Plasma Enhanced Chemical Vapor Deposition

Author : Surya Venkata Sekhar Cheemalapati
Publisher :
ISBN 13 :
Total Pages : 94 pages
Book Rating : 4.:/5 (821 download)

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Book Synopsis The Effect of Catalyst Properties on the Synthesis of Carbon Nanotubes by Plasma Enhanced Chemical Vapor Deposition by : Surya Venkata Sekhar Cheemalapati

Download or read book The Effect of Catalyst Properties on the Synthesis of Carbon Nanotubes by Plasma Enhanced Chemical Vapor Deposition written by Surya Venkata Sekhar Cheemalapati and published by . This book was released on 2012 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the effect of catalyst properties on the synthesis of carbon nanotubes (CNTs) is done in this thesis. Three different metal alloy catalysts, Fe/Ti, Ni/Ti, Co/Ti, have been studied. Various atomic concentrations and thicknesses were cosputter deposited on clean Si wafers using AJA Orion 4 RF Magnetron sputter deposition tool at 5mtorr and 17°C, and the films were characterized using a scanning electron microscope, Energy-dispersive X-ray spectroscopy. All the alloys have been annealed at 650°C and 3 torr in an argon atmosphere at 100 SCCM, followed by ammonia gas plasma etch at different powers at 3 torr and 50 SCCM NH3 flow in a modified parallel plate RF chemical vapor deposition tool for 1 minute. The influence of plasma power, thickness of catalyst and concentration of Ti the secondary metal in the alloy composition, on the surface morphology of the catalyst are investigated by characterizing them with atomic force microscopy. The study has shown that the surface roughness is affected by Ti concentration, thickness and plasma power. The 35 W power NH3 plasma produced rougher surfaces when compared to the 75 W NH3 plasma. The result is interpreted as follows: ion bombardment leads to greater etching of the catalyst surface. Thus, plasma power must be optimized for catalyst thin film and etch time. The study has provided an in depth analysis and understanding of the various factors that influence catalyst surface morphology which can be applied into further study for optimizing parameters for synthesis of single walled CNTs. Following this, a study on catalysts for CNT synthesis was performed using Plasma enhanced chemical vapor deposition and characterized by scanning electron microscope. CNTs were synthesized on Ni, Ni-Ti, Co, Co-Ti and Fe catalyst. Ni, Ni-Ti catalyst produced forest like vertically aligned CNTs whereas Co, Co-Ti produced vertically aligned free standing CNTs. The growth was dense and uniform across the substrate. Initial growth runs on Fe, Fe-Ti alloy did not produce any CNTs until catalyst was restructured with a thicker Ti under layer after an investigation using Secondary ion mass spectrometry of suspected Fe catalyst poisoning due to reaction with Si substrate. A room temperature run was carried out on annealed and plasma etched Ni catalyst and no CNTs were produced indicating the importance of substrate temperature of CNTs. A deeper understanding of factors of influence on CNTs such as catalyst types, structure/morphology, and substrate temperature has been achieved with this study.

Substrate and Catalyst Design for Chemical Vapor Deposition Synthesis of Carbon Nanotubes on Si, Cu and SiC

Author : Ge Li
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (811 download)

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Book Synopsis Substrate and Catalyst Design for Chemical Vapor Deposition Synthesis of Carbon Nanotubes on Si, Cu and SiC by : Ge Li

Download or read book Substrate and Catalyst Design for Chemical Vapor Deposition Synthesis of Carbon Nanotubes on Si, Cu and SiC written by Ge Li and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis discussed the design of substrate and catalyst for chemical vapor deposition synthesis of carbon nanotubes (CNT). It was focused on synthesis CNTs on the various substrates, such as Si, Cu and SiC. The research was structured as following: (1) characterization of the Al2O3 buffer layer produced by plasma oxidation in order to find out the its effect on CNT growth; (2) study of the position parameters in CVD system to optimize process condition for manufacturing CNTs; (3) exploring novel composite catalyst alloys; (4) design new substrate for synthesis of vertically aligned CNTs on Cu and SiC for thermal application. Advanced surface analysis techniques were used to explore the role of AI2O3 supporting layer and of the composite catalyst. Although the data is insufficient for coming to a conclusion on the mechanism behind CNT super-growth, the preliminary studies provide guidance for selecting catalyst composite which will allow scaling up CNT production. A series of experiments using two CVD system (ET 1000 & ET 3000) were conducted which allowed for optimize the growth parameter and produce CNT arrays with uniform length. Vertically aligned CNTs arrays were successfully synthesized on copper and SiC substrates by adding supporting layers and adjusting the CVD growth conditions. This achievement engenders a wide range of future application in the field of thermal management.

Mechanical Engineering for Sustainable Development: State-of-the-Art Research

Author : C.S.P. Rao
Publisher : CRC Press
ISBN 13 : 1351170155
Total Pages : 640 pages
Book Rating : 4.3/5 (511 download)

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Book Synopsis Mechanical Engineering for Sustainable Development: State-of-the-Art Research by : C.S.P. Rao

Download or read book Mechanical Engineering for Sustainable Development: State-of-the-Art Research written by C.S.P. Rao and published by CRC Press. This book was released on 2019-01-04 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides valuable insight into diverse topics related to mechanical engineering and presents state-of-the-art work on sustainable development being carried out throughout the world by budding researchers and scientists. Divided into three sections, the volume covers machine design, materials and manufacturing, and thermal engineering. It presents innovative research work on machine design that is of relevance to such varied fields as the automotive industry, agriculture, and human anatomy. The second section addresses materials characterization, an important tool in assessing proper materials for application-oriented jobs, and emerging unconventional machining processes that are important in design engineering for new products and tools. The section on thermal engineering broadly covers the use of viable alternate fuels, such as HHO, biodiesel, etc., with the objective of reducing the burden on petroleum reserves and the environment.

Preparation of Monodispersed Fe-Mo Nanoparticles as the Catalyst for CVD Synthesis of Carbon Nanotubes

Author :
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Preparation of Monodispersed Fe-Mo Nanoparticles as the Catalyst for CVD Synthesis of Carbon Nanotubes by :

Download or read book Preparation of Monodispersed Fe-Mo Nanoparticles as the Catalyst for CVD Synthesis of Carbon Nanotubes written by and published by . This book was released on 2001 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Uniform iron-molybdenum nanoparticles were prepared by thermal decomposition of metal carbonyl complexes using a mixture of long-chain carboxylic acid and long-chain amine as protective agents. The sizes of the nanoparticles can be systematically varied from 3 to 14 nm by changing the experimental conditions. High-resolution TEM images and EDX data show that the prepared nanoparticles are highly crystalline iron nanoparticles containing 4% molybdenum. The effects of the concentration, reaction time, the ratio of metal carbonyl complexes versus protective agents, and the ratio of acid/amine of the protective agents on the sizes of the produced nanoparticles were systematically studied. The prepared nanoparticles were used as catalysts for single-walled carbon nanotube growth and the results indicate that there is an upper limit for the size of the catalyst particles to nucleate singlewalled carbon nanotubes.

Carbon Nanostructured Materials

Author : Alexander Khovavko
Publisher : Springer Nature
ISBN 13 : 3031641213
Total Pages : 163 pages
Book Rating : 4.0/5 (316 download)

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Book Synopsis Carbon Nanostructured Materials by : Alexander Khovavko

Download or read book Carbon Nanostructured Materials written by Alexander Khovavko and published by Springer Nature. This book was released on with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Scalable Carbon Nanotube Growth and Design of Efficient Catalysts for Fischer-Tropsch Synthesis

Author : Haider H. Almkhelfe
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (12 download)

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Book Synopsis Scalable Carbon Nanotube Growth and Design of Efficient Catalysts for Fischer-Tropsch Synthesis by : Haider H. Almkhelfe

Download or read book Scalable Carbon Nanotube Growth and Design of Efficient Catalysts for Fischer-Tropsch Synthesis written by Haider H. Almkhelfe and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The continued depletion of fossil fuels and concomitant increase in greenhouse gases have encouraged worldwide research on alternative processes to produce clean fuel. Fischer-Tropsch synthesis (FTS) is a heterogeneous catalytic reaction that converts syngas (CO and H2) to liquid hydrocarbons. FTS is a well-established route for producing clean liquid fuels. However, the broad product distribution and limited catalytic activity are restricting the development of FTS. The strong interactions between the active metal catalyst (Fe or Co) and support (Al2O3, SiO2 and TiO2) during post-synthesis treatments of the catalyst (such as calcination at ~500°C and reduction ~550°C) lead to formation of inactive and unreducible inert material like Fe2SiO4, CoAl2O4, Co2SiO4. The activity of FTS catalyst is negatively impacted by the presence of these inactive compounds. In our study, we demonstrate the use of a modified photo-Fenton process for the preparation of carbon nanotube (CNT)-supported Co and Fe catalysts that are characterized by small and well-dispersed catalyst particles on CNTs that require no further treatments. The process is facile, highly scalable, and involves the use of green catalyst precursors and an oxidant. The reaction kinetic results show high CO conversion (85%), selectivity for liquid hydrocarbons and stability. Further, a gaseous product mixture from FTS (C1-C4) was utilized as an efficient feedstock for the growth of high-quality, well-aligned single-wall carbon nanotube (SWCNT) carpets of millimeter-scale heights on Fe and (sub) millimeter-scale heights on Co catalysts via chemical vapor deposition (CVD). Although SWCNT carpets were grown over a wide temperature range (between 650 and 850°C), growth conducted at optimal temperatures for Co (850°C) and Fe (750°C) yielded predominantly SWCNTs that are straight, clean, and with sidewalls that are largely free of amorphous carbon. Also, low-temperature CVD growth of CNT carpets from Fe and Fe-Cu catalysts using a gaseous product mixture from FTS as a superior carbon feedstock is demonstrated. The efficiency of the growth process is evidenced by the highly dense, vertically aligned CNT structures from both Fe and Fe-Cu catalysts even at temperatures as low as 400°C-a record low growth temperature for CNT carpets obtained via conventional thermal CVD. The use of FTS-GP facilitates low-temperature growth of CNT carpets on traditional (alumina film) and nontraditional substrates (aluminum foil) and has the potential of enhancing CNT quality, catalyst lifetime, and scalability. We demonstrate growth of SWCNT carpets with diameter distributions that are smaller than SWCNTs in conventional carpets using a CVD process that utilizes the product gaseous mixture from Fischer-Tropsch synthesis (FTS-GP). The high-resolution transmission electron microscopic (HR-TEM) and Raman spectroscopic results reveal that the use of a high melting point metal as a catalyst promoter in combination with either Co (1.5 nm ± 0.7) at 850oC or Fe (1.9 nm ± 0.8) at 750oC yields smaller-diameter SWCNT arrays with narrow diameter distributions. Scalable synthesis of carbon nanotubes (CNTs), carbon nanofibers (CNFs), and onion like carbon (OLC) in a batch reactor using supercritical fluids as a reaction media is demonstrated. The process utilizes toluene, ethanol, or butanol as a carbon precursor in combination with ferrocene that serves as a catalyst precursor and a secondary carbon source. The use of supercritical fluids for growth does not only provide a route for selective growth of a variety of carbon nanomaterials, but also provides a unique one-step approach that is free of aggressive acid treatment for synthesis of CNT-supported metallic nanoparticle composites for catalysis and energy storage applications.

Carbon Nanotubes

Author : Ajay Kumar Mishra
Publisher : Nova Science Publishers
ISBN 13 : 9781620819142
Total Pages : 0 pages
Book Rating : 4.8/5 (191 download)

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Book Synopsis Carbon Nanotubes by : Ajay Kumar Mishra

Download or read book Carbon Nanotubes written by Ajay Kumar Mishra and published by Nova Science Publishers. This book was released on 2012-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes possess unusual fascinating properties which have attracted the scientific world. This book covers a very wide domain of research and development where the synthesis and properties of carbon nanotubes are discussed. This book describes the carbon nanotube general introduction, various synthesis procedures and properties. This book is going to be beneficial to the researchers who are working for their postgraduate degree in nanomaterials and nanotechnology. This book also provides a platform for all the academics and researchers as it covers a vast background for the recent literature, abbreviations, and summaries. This book will be worth reading for the researchers who are more interested in the general overview of carbon nanotubes, fundamentals concepts and various synthetic procedures in the multidisciplinary areas. This book contains the fundamental knowledge with the recent advancements for the research and development in the field of nanomaterials and nanotechnology.

Plasma Catalysis

Author : Annemie Bogaerts
Publisher : MDPI
ISBN 13 : 3038977500
Total Pages : 248 pages
Book Rating : 4.0/5 (389 download)

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Book Synopsis Plasma Catalysis by : Annemie Bogaerts

Download or read book Plasma Catalysis written by Annemie Bogaerts and published by MDPI. This book was released on 2019-04-02 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma catalysis is gaining increasing interest for various gas conversion applications, such as CO2 conversion into value-added chemicals and fuels, N2 fixation for the synthesis of NH3 or NOx, methane conversion into higher hydrocarbons or oxygenates. It is also widely used for air pollution control (e.g., VOC remediation). Plasma catalysis allows thermodynamically difficult reactions to proceed at ambient pressure and temperature, due to activation of the gas molecules by energetic electrons created in the plasma. However, plasma is very reactive but not selective, and thus a catalyst is needed to improve the selectivity. In spite of the growing interest in plasma catalysis, the underlying mechanisms of the (possible) synergy between plasma and catalyst are not yet fully understood. Indeed, plasma catalysis is quite complicated, as the plasma will affect the catalyst and vice versa. Moreover, due to the reactive plasma environment, the most suitable catalysts will probably be different from thermal catalysts. More research is needed to better understand the plasma–catalyst interactions, in order to further improve the applications.

Synthesis, Technology and Applications of Carbon Nanomaterials

Author : Suraya Abdul Rashid
Publisher : Elsevier
ISBN 13 : 0128162597
Total Pages : 366 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Synthesis, Technology and Applications of Carbon Nanomaterials by : Suraya Abdul Rashid

Download or read book Synthesis, Technology and Applications of Carbon Nanomaterials written by Suraya Abdul Rashid and published by Elsevier. This book was released on 2018-10-10 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: Synthesis, Technology and Applications of Carbon Nanomaterials explores the chemical properties of different classes of carbon nanomaterials and their major applications. As carbon nanomaterials are used for a variety of applications due to their versatile properties and characteristics, this book discusses recent advances in synthesis methods, characterization, and applications of 0D -3D dimensional carbon nanomaterials. It is an essential resource for readers focusing on carbon nanomaterials research. Explores the chemical properties of different classes of carbon nanomaterials and their major applications Discusses recent advances in synthesis methods, characterization, and applications of 0D -3D dimensional carbon nanomaterials

Synthesis of Carbon Nanotubes by Catalytic Chemical Vapor Deposition

Author : GuiPing Dai
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (139 download)

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Book Synopsis Synthesis of Carbon Nanotubes by Catalytic Chemical Vapor Deposition by : GuiPing Dai

Download or read book Synthesis of Carbon Nanotubes by Catalytic Chemical Vapor Deposition written by GuiPing Dai and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a new carbon material in the twenty-first century, carbon nanotubes (CNTs) have excellent optical, electrical, magnetic, thermal, chemical, and mechanical properties. There are many synthesis methods to produce CNTs. Compared with other methods, chemical vapor deposition (CVD) is the most effective method that has broad prospects for large-scale control of CNTs in recent years due to its simple equipment, simple operation, and lower cost. In order to gain a comprehensive understanding of the controlling parameters about the formation of CNTs, this chapter reviews the latest progress in the preparation of CNTs by CVD from three of the most important influencing factors: carbon sources, catalysts, and substrates. Among them, the catalyst is the most influential factor for the morphology, structure, and properties of CNTs. It should be pointed out that many growth factors can control the particle size distribution, composition, and structure of the catalysts, such as catalyst substrate, metal transition components added, calcination temperature, etc.

Graphene Science Handbook, Six-Volume Set

Author : Mahmood Aliofkhazraei
Publisher : CRC Press
ISBN 13 : 1466591196
Total Pages : 3379 pages
Book Rating : 4.4/5 (665 download)

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Book Synopsis Graphene Science Handbook, Six-Volume Set by : Mahmood Aliofkhazraei

Download or read book Graphene Science Handbook, Six-Volume Set written by Mahmood Aliofkhazraei and published by CRC Press. This book was released on 2016-04-26 with total page 3379 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene is the strongest material ever studied and can be an efficient substitute for silicon. This six-volume handbook focuses on fabrication methods, nanostructure and atomic arrangement, electrical and optical properties, mechanical and chemical properties, size-dependent properties, and applications and industrialization. There is no other major reference work of this scope on the topic of graphene, which is one of the most researched materials of the twenty-first century. The set includes contributions from top researchers in the field and a foreword written by two Nobel laureates in physics. Volumes in the set: K20503 Graphene Science Handbook: Mechanical and Chemical Properties (ISBN: 9781466591233) K20505 Graphene Science Handbook: Fabrication Methods (ISBN: 9781466591271) K20507 Graphene Science Handbook: Electrical and Optical Properties (ISBN: 9781466591318) K20508 Graphene Science Handbook: Applications and Industrialization (ISBN: 9781466591332) K20509 Graphene Science Handbook: Size-Dependent Properties (ISBN: 9781466591356) K20510 Graphene Science Handbook: Nanostructure and Atomic Arrangement (ISBN: 9781466591370)

Synthesis of Carbon Nanotubes Over Supported Hybrid Catalyst Via Catalytic Chemical Vapor Deposition of Acetylene

Author : Harnini Azira Abdullah
Publisher :
ISBN 13 :
Total Pages : 54 pages
Book Rating : 4.:/5 (96 download)

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Book Synopsis Synthesis of Carbon Nanotubes Over Supported Hybrid Catalyst Via Catalytic Chemical Vapor Deposition of Acetylene by : Harnini Azira Abdullah

Download or read book Synthesis of Carbon Nanotubes Over Supported Hybrid Catalyst Via Catalytic Chemical Vapor Deposition of Acetylene written by Harnini Azira Abdullah and published by . This book was released on 2012 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Selective Area Synthesis of 3-D Carbon Nanotube Forest Microsctructures

Author : Ryan Patrick Hines
Publisher :
ISBN 13 :
Total Pages : 96 pages
Book Rating : 4.:/5 (19 download)

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Book Synopsis Selective Area Synthesis of 3-D Carbon Nanotube Forest Microsctructures by : Ryan Patrick Hines

Download or read book Selective Area Synthesis of 3-D Carbon Nanotube Forest Microsctructures written by Ryan Patrick Hines and published by . This book was released on 2018 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes (CNTs) are solid carbon allotropes that feature high strength and high transport capabilities. When large populations of CNTs are synthesized simultaneously, they self-assemble into vertically oriented CNT forests (also called CNT arrays or CNT turfs). In the current work, three-dimensional CNT forest microstructures are engineered by selectively activating CNT growth on specific regions of a patterned substrate. The process is realized using a combination of two distinct chemical vapor deposition (CVD) processes in concert with silicon substrates independently patterned with regions of alumina, iron, or alumina and iron. The CVD process of both techniques require a catalyst nanoparticle to facilitate CNT growth and a hydrocarbon gaseous precursor. Floating catalyst CVD, a process in which CNT catalyst is delivered to a substrate in the vapor state, is compatible with oxide-coated substrates and not compatible with bare silicon surfaces. Fixed catalyst CVD utilizes a static iron film catalyst layer to support CNT synthesis. Regions of alumina support selective CNT forest growth with floating catalyst CVD, while regions of layered Al2O3/Fe support both fixed and floating catalyst growth when the fixed catalyst is activated first. By selectively and sequentially activating specific regions of a lithographically-defined substrate using the various CVD processes, complex 3D microstructures are demonstrated. The resultant CNT forest microstructures are characterized using scanning electron microscopy (SEM) and nanoindentation. Atomic force microscopy is used to analyze the behavior of the fixed iron catalyst during the high temperatures required for CVD processing.

Nanostructured Carbon Materials for Catalysis

Author : Philippe Serp
Publisher : Royal Society of Chemistry
ISBN 13 : 1782624570
Total Pages : 570 pages
Book Rating : 4.7/5 (826 download)

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Book Synopsis Nanostructured Carbon Materials for Catalysis by : Philippe Serp

Download or read book Nanostructured Carbon Materials for Catalysis written by Philippe Serp and published by Royal Society of Chemistry. This book was released on 2015-03-02 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: "We heartily recommend this book to all readers who wish to gain a better understanding of nanostructured carbon materials surface properties and used in catalysis." An-Hui Lu, ChemCatChem There is great interest in using nanostructured carbon materials in catalysis, either as supports for immobilizing active species or as metal-free catalysts due to their unique structural, thermal, chemical, electronic and mechanical properties, and tailorable surface chemistry. This book looks at the structure and properties of different doped and undoped nanocarbons including graphene; fullerenes; nanodiamonds; carbon nanotubes and nanofibers; their synthesis and modification to produce catalysts. Special attention is paid to adsorption, as it impacts the application of these materials in various industrially relevant catalytic reactions discussed herein, in addition to photocatalysis and electrocatalysis. Written by leading experts in the area, this is the first book to provide a comprehensive view of the subject for the catalysis community.