Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Download Properties Of Al Doped Zno Nanorods Synthesized Using Low Temperature Hydrothermal Method full books in PDF, epub, and Kindle. Read online Properties Of Al Doped Zno Nanorods Synthesized Using Low Temperature Hydrothermal Method ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)
Download or read book Properties of Al-Doped ZnO Nanorods Synthesized Using Low Temperature Hydrothermal Method written by and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hatim Alnoor
Publisher : Linköping University Electronic Press
ISBN 13 : 9176854817
Total Pages : 96 pages
Book Rating : 4.1/5 (768 download)
Download or read book Toward the Optimization of Low-temperature Solution-based Synthesis of ZnO Nanostructures for Device Applications written by Hatim Alnoor and published by Linköping University Electronic Press. This book was released on 2017-10-06 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: One-dimensional (1D) nanostructures (NSs) of Zinc Oxide (ZnO) such as nanorods (NRs) have recently attracted considerable research attention due to their potential for the development of optoelectronic devices such as ultraviolet (UV) photodetectors and light-emitting diodes (LEDs). The potential of ZnO NRs in all these applications, however, would require synthesis of high crystal quality ZnO NRs with precise control over the optical and electronic properties. It is known that the optical and electronic properties of ZnO NRs are mostly influenced by the presence of native (intrinsic) and impurities (extrinsic) defects. Therefore, understanding the nature of these intrinsic and extrinsic defects and their spatial distribution is critical for optimizing the optical and electronic properties of ZnO NRs. However, identifying the origin of such defects is a complicated matter, especially for NSs, where the information on anisotropy is usually lost due to the lack of coherent orientation. Thus, the aim of this thesis is towards the optimization of the lowtemperature solution-based synthesis of ZnO NRs for device applications. In this connection, we first started with investigating the effect of the precursor solution stirring durations on the deep level defects concentration and their spatial distribution along the ZnO NRs. Then, by choosing the optimal stirring time, we studied the influence of ZnO seeding layer precursor’s types, and its molar ratios on the density of interface defects. The findings of these investigations were used to demonstrate ZnO NRs-based heterojunction LEDs. The ability to tune the point defects along the NRs enabled us further to incorporate cobalt (Co) ions into the ZnO NRs crystal lattice, where these ions could occupy the vacancies or interstitial defects through substitutional or interstitial doping. Following this, high crystal quality vertically welloriented ZnO NRs have been demonstrated by incorporating a small amount of Co into the ZnO crystal lattice. Finally, the influence of Co ions incorporation on the reduction of core-defects (CDs) in ZnO NRs was systematically examined using electron paramagnetic resonance (EPR).
Author : Magnus Willander
Publisher : CRC Press
ISBN 13 : 9814411345
Total Pages : 225 pages
Book Rating : 4.8/5 (144 download)
Download or read book Zinc Oxide Nanostructures written by Magnus Willander and published by CRC Press. This book was released on 2014-07-22 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc oxide (ZnO) in its nanostructured form is emerging as a promising material with great potential for the development of many smart electronic devices. This book presents up-to-date information about various synthesis methods to obtain device-quality ZnO nanostructures. It describes both high-temperature (over 100 C) and low-temperature (under
Author : Amir Hassanpour
Publisher :
ISBN 13 :
Total Pages : 184 pages
Book Rating : 4.:/5 (113 download)
Download or read book Controlled Hydrothermal Growth of ZnO Nanorod Arrays written by Amir Hassanpour and published by . This book was released on 2017 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc oxide (ZnO) is a well-studied wide band gap (3̃.37 eV) n-type semiconductor material with significant properties such as large exciton binding energy (60 meV). Recently, 1-dimensional ZnO nanostructures have attracted a lot of attention owing to their dimensionality-dependent chemical, physical, electrical, and magnetic properties. In this project, we have grown patterned low-aspect-ratio, well-separated single ZnO nanorods using a hydrothermal method on two different substrates with dissimilar crystal orientations. ZnO nuclei have been used as a seed layer to compensate the crystal mismatch between the substrates and nanorods. Based on XRD results, in order to have highly oriented nanorods, the seed layer must be annealed over 300 ̊C. Micro-Raman spectra show that our patterned nanorods have a wurtzite crystal structure, with most nanorods presenting vertical orientation relative to the substrate. Room-temperature micro-photoluminescence spectra from the nanorods show sharp band edge emission at 385 nm and a common broadband defect emission in the visible range. This method is a significant step towards an economical controlled synthesis of 1-dimensional ZnO for application in mass-production advanced devices. In the second part, undoped and C-doped (C: Mg, Ni, Mn, Co, Cu, Cr, Na) ZnO nanorods were synthesized by a hydrothermal method at temperatures as low as 60 C̊. The effect of doping on morphology of the ZnO nanorods was visualized by taking their cross section and top SEM images. The crystallinity change of the ZnO nanorods due to each cationic dopant was thoroughly investigated according to their XRD patterns. The optical Raman active modes of undoped and cation-doped nanorods were measured with a micro-Raman set up at room temperature. The surface chemistry of undoped and doped ZnO nanorods were investigated by X-ray photoelectron spectroscopy and Energy-dispersive X-ray spectroscopy. Finally, the band gap shift and defect emission of undoped and doped nanorods were measured by a photoluminescence set up at room temperature. Our results can be used as a comprehensive reference regarding the engineering of the morphological, structural and optical properties of ZnO nanorods by using a low temperature doping synthesis as an economical mass production approach.
Author : Rajni Bagga
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)
Download or read book Hydrothermal Growth of Zinc Oxide Nanorods Doped with Manganese written by Rajni Bagga and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: ZnO nanostructures can be grown using a variety of techniques. Using a hydrothermal method, ZnO nanostructures can be produced easily on a large scale due to the low temperature involved. ZnO is a well-studied wide-band gap (3.37 eV) n-type semiconductor material with significant properties such as a large exciton binding energy (60 meV). In this project we have chosen the hydrothermal method to synthesize undoped and manganese doped zinc oxide nanorods at different growth temperatures of {60}^0C, {70}^0C, {80}^0C, and\ {90}^0C respectively for 20h. We made a seed layer of ZnO on the Si substrate by annealing zinc acetate at {400}^0 C. The morphology of the nanorods was visualised by taking their side and top SEM images. Micro Raman Spectra shows the crystal orientation of the nanorods with respect to substrate and optical Raman-active modes of undoped and doped nanorods. Room-temperature micro-Photoluminescence spectra of nanorods shows the sharp near band emission at 383 nm and broadband defect emission in the visible range. From EPR spectroscopy we find out whether a significant amount of Mn was incorporated into nanorods. Our findings indicate that the presence of Mn in the growth medium results in improved morphology, even though at the lowest growth temperatures there is no clear incorporation of Mn into the nanorods. This implies that the presence of the Mn ions in the group medium is enough to increase the growth rates of ZnO, regardless of whether the ions are incorporated into the crystal or not.
Author : Zhe Chuan Feng
Publisher : Taylor & Francis
ISBN 13 : 143985582X
Total Pages : 1008 pages
Book Rating : 4.4/5 (398 download)
Download or read book Handbook of Zinc Oxide and Related Materials written by Zhe Chuan Feng and published by Taylor & Francis. This book was released on 2012-09-26 with total page 1008 pages. Available in PDF, EPUB and Kindle. Book excerpt: Through their application in energy-efficient and environmentally friendly devices, zinc oxide (ZnO) and related classes of wide gap semiconductors, including GaN and SiC, are revolutionizing numerous areas, from lighting, energy conversion, photovoltaics, and communications to biotechnology, imaging, and medicine. With an emphasis on engineering a
Author : Teen-Hang Meen
Publisher : MDPI
ISBN 13 : 303928973X
Total Pages : 220 pages
Book Rating : 4.0/5 (392 download)
Download or read book Intelligent Electronic Devices written by Teen-Hang Meen and published by MDPI. This book was released on 2020-05-20 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a modern technological society, electronic engineering and design innovations are both academic and practical engineering fields that involve systematic technological materialization through scientific principles and engineering designs. Engineers and designers must work together with a variety of other professionals in their quest to find systems solutions to complex problems. Rapid advances in science and technology have broadened the horizons of engineering while simultaneously creating a multitude of challenging problems in every aspect of modern life. Current research is interdisciplinary in nature, reflecting a combination of concepts and methods that often span several areas of mechanics, mathematics, electrical engineering, control engineering, and other scientific disciplines. In addition, the 2nd IEEE International Conference on Knowledge Innovation and Invention 2019 (IEEE ICKII 2019) was held in Seoul, South Korea, on 12–15 July, 2019. This book, “Intelligent Electronic Devices”, includes 13 excellent papers form 260 papers presented in this conference about intelligent electronic devices. The main goals of this book were to encourage scientists to publish their experimental and theoretical results in as much detail as possible and to provide new scientific knowledge relevant to the topics of electronics.
Author : Seyed Ebrahim Chalangar
Publisher : Linköping University Electronic Press
ISBN 13 : 9179296823
Total Pages : 132 pages
Book Rating : 4.1/5 (792 download)
Download or read book Synthesis and Characterization of ZnO/Graphene Nanostructures for Electronics and Photocatalysis written by Seyed Ebrahim Chalangar and published by Linköping University Electronic Press. This book was released on 2021-04-08 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent rapid development of electronics and electro-optical devices demands affordable and reliable materials with enhanced performance. Forming nanocomposites of already well-known materials is one possible route towards novel functional materials with desirable synergistic enhanced properties. Incompatible chemical properties, mismatched crystal structures and weak bonding interactions between the substances, however, often limit the number of possible nanocomposites. Moreover, using an inexpensive, facile, large-area and flexible fabrication technique is crucial to employ the new composites in industrially viable applications. This thesis focuses on the synthesis and characterization of different zinc oxide/graphene (ZnO/GR) nanocomposites, well suited for optoelectronics and photocatalysis applications. Two different approaches of i) substrate-free random synthesis, and ii) template-assisted selective area synthesis were studied in detail. In the first approach, ZnO nanoparticles/rods were grown on GR. The obtained nanocomposites were investigated for better GR dispersity, electrical conductivity and optical properties. Besides, by adding silver iodide to the nanocomposite, an enhanced plasmonic solar-driven photocatalyst was synthesized and analyzed. In the second approach, arrays of single, vertically aligned ZnO nanorods were synthesized using a colloidal lithography-patterned sol-gel ZnO seed layer. Our demonstrated nanofabrication technique with simple, substrate independent, and large wafer-scale area compatibility improved the alignment and surface density of ZnO nanorods over large selective growth areas. Eventually, we found a novel method to further enhance the vertical alignment of the ZnO nanorods by introducing a GR buffer layer between the Si substrate and the ZnO seed layer, together with the mentioned patterning technique. The synthesized nanocomposites were analyzed using a large variety of experimental techniques including electron microscopy, photoelectron spectroscopy, x-ray diffraction, photoluminescence and cathodoluminescence spectroscopy for in-depth studies of their morphology, chemical and optical properties. Our findings show that the designed ZnO/GR nanocomposites with vertically aligned ZnO nanorods of high crystalline quality, synthesized with the developed low-cost nanofabrication technique, can lead to novel devices offering higher performance at a significantly lower fabrication cost.
Author : Crina Anastasescu
Publisher : Springer
ISBN 13 : 331932988X
Total Pages : 89 pages
Book Rating : 4.3/5 (193 download)
Download or read book 1D Oxide Nanostructures Obtained by Sol-Gel and Hydrothermal Methods written by Crina Anastasescu and published by Springer. This book was released on 2016-08-30 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents wet chemical sol-gel and hydrothermal methods for 1D oxide nanostructure preparation. These methods represent an attractive route to multifunctional nanomaterials synthesis, as they are versatile, inexpensive and, thus, appropriate for obtaining a wide range of oxide materials with tailored morphology and properties. Three specific oxides (SiO2, TiO2, ZnO) are discussed in detail in order to illustrate the principle of the sol-gel and hydrothermal preparation of 1D oxide nanostructures. Other oxides synthesized via this method are also briefly presented. Throughout the book, the correlation between the tubular structure and the physico-chemical properties of these materials is highlighted. 1D oxide nanostructures exhibit interesting optical and electrical properties, due to their confined morphology. In addition, a well-defined geometry can be associated with chemically active species. For example, the pure SiO2 nanotubes presented a slight photocatalytic activity, while the Pt-doped SiO2 tubular materials act as microreactors in catalytic reactions. In the case of titania and titanate nanotubes, large specific surface area and pore volume, ion-exchange ability, enhanced light absorption, and fast electron-transport capability have attracted significant research interest. The chemical and physical modifications (microwave assisted hydrothermal methods) discussed here improve the formation kinetics of the nanotubes. The ZnO nanorods/tubes were prepared as random particles or as large areas of small, oriented 1D ZnO nanostructures on a variety of substrates. In the latter case a sol-gel layer is deposited on the substrate prior to the hydrothermal preparation. Using appropriate dopants, coatings of ZnO nanorods with controlled electrical behavior can be obtained.
Author : Mohindar Seehra
Publisher : BoD – Books on Demand
ISBN 13 : 9535133713
Total Pages : 225 pages
Book Rating : 4.5/5 (351 download)
Download or read book Nanostructured Materials written by Mohindar Seehra and published by BoD – Books on Demand. This book was released on 2017-07-12 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: There continues to be a worldwide interest in the size-dependent properties of nanostructured materials and their applications in many diverse fields such as catalysis, sensors, energy conversion processes, and biomedicine to name a few. The eleven chapters of this book written by different researchers include four chapters on the different methods of fabrication of specific materials followed by characterization of their properties, and the remaining seven chapters focusing on the fabrications and applications including three chapters on biomedical applications, two chapters on sensors, one chapter on solar cells, and one chapter on the use of nanoparticles in herbicides. These chapters provide up-to-date reviews useful for current and future researchers in these specific areas.
Author : Claus F. Klingshirn
Publisher : Springer Science & Business Media
ISBN 13 : 3642105777
Total Pages : 366 pages
Book Rating : 4.6/5 (421 download)
Download or read book Zinc Oxide written by Claus F. Klingshirn and published by Springer Science & Business Media. This book was released on 2010-07-01 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book gives a comprehensive review of the present state-of-the-art in ZnO R+D, including growth, doping, lattice dynamics, electric magnetic and optical properties. The emphasis is on the electric and optical properties, because this is the area where novel applications may be expected with highest promise. The book highlights not only the most recent results but gives both an overview of past research and of the present status -- not avoiding critical and controversial discussions of various aspects such as bank symmetries and laser processes. Intended to have long-lasting impact on ZnO R+D, this monograph addresses (post-)graduate students but also advanced scientists, who want to embark on ZnO research or are already involved, the present state of the art and assists them in avoiding duplication of old results (or mistakes).
Author : Sotirios Baskoutas
Publisher : MDPI
ISBN 13 : 3038973025
Total Pages : 303 pages
Book Rating : 4.0/5 (389 download)
Download or read book Zinc Oxide Nanostructures: Synthesis and Characterization written by Sotirios Baskoutas and published by MDPI. This book was released on 2018-12-04 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Zinc Oxide Nanostructures: Synthesis and Characterization" that was published in Materials
Author : Hadis Morkoç
Publisher : John Wiley & Sons
ISBN 13 : 3527623957
Total Pages : 488 pages
Book Rating : 4.5/5 (276 download)
Download or read book Zinc Oxide written by Hadis Morkoç and published by John Wiley & Sons. This book was released on 2008-12-03 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first systematic, authoritative and thorough treatment in one comprehensive volume presents the fundamentals and technologies of the topic, elucidating all aspects of ZnO materials and devices. Following an introduction, the authors look at the general properties of ZnO, as well as its growth, optical processes, doping and ZnO-based dilute magnetic semiconductors. Concluding sections treat bandgap engineering, processing and ZnO nanostructures and nanodevices. Of interest to device engineers, physicists, and semiconductor and solid state scientists in general.
Author : Usha Chandra
Publisher : BoD – Books on Demand
ISBN 13 : 9535132458
Total Pages : 312 pages
Book Rating : 4.5/5 (351 download)
Download or read book Recent Applications in Sol-Gel Synthesis written by Usha Chandra and published by BoD – Books on Demand. This book was released on 2017-07-05 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Versatility, extended compositional ranges, better homogeneity, lesser energy consumption, and requirement of nonexpensive equipments have boosted the use of sol-gel process on top of the popularity in the synthesis of nanosystems. The sol-gel technique has not only revolutionized oxide ceramics industry and/or material science but has also extended widely into multidimensional applications. The book Recent Applications in Sol-Gel Synthesis comprises 14 chapters that deal mainly with the application-oriented aspects of the technique. Sol-gel prepared metal oxide (MO) nanostructures like nanospheres, nanorods, nanoflakes, nanotubes, and nanoribbons have been employed in biomedical applications involving drug deliveries, mimicking of natural bone, and antimicrobial activities. The possibility of controlling grain size in aerogel and preparation of ultrahigh-temperature ceramic (UHTC)-based materials, fluorescent glasses, ultraviolet photosensors, and photocatalysts have been discussed in detail by the experts in the field. The usefulness of sol-gel materials as active GRIN, as textile finisher, and as leather modifier with water-repellent and oil-resistive properties would be an incentive for researchers keen to pursue the field.
Author : Teofil Jesionowski
Publisher : MDPI
ISBN 13 : 3039213970
Total Pages : 204 pages
Book Rating : 4.0/5 (392 download)
Download or read book Multifunctional Oxide-Based Materials: From Synthesis to Application written by Teofil Jesionowski and published by MDPI. This book was released on 2019-09-03 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book deals with novel aspects and perspectives in metal oxide and hybrid material fabrication. The contributions are mainly focused on the search for a new group of advanced materials with designed physicochemical properties, especially an expanded porous structure and defined surface activity. The proposed technological procedures result in an enhanced activity of the synthesized hybrid materials, which is of great importance when considering their potential fields of application. The use of such materials in different technological disciplines, including aspects associated with environmental protection, allows for the verification of the proposed synthesis method. Thus, it can be stated that those aspects are of interdisciplinary character and may be located at the interface of three scientific disciplines—chemistry, materials science, and engineering—as well as environmental protection. Furthermore, the presented scientific scope is in some way an answer to the continuous demand for such types of materials and opens new perspectives for their practical use
Author : Hyoungwon Park
Publisher :
ISBN 13 :
Total Pages : 61 pages
Book Rating : 4.:/5 (899 download)
Download or read book Hydrothermal Synthesis of Al-doped ZnO Nanowires and Their Application for Photovoltaic Devices written by Hyoungwon Park and published by . This book was released on 2014 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor nanostructures exhibit distinct properties by virtue of nano-scale dimensionality, resulting in recent interest in semiconducting nanowires for electronic, photonic, and energy applications. Along with nanowires, quantum dots are solution-processable nanocrystals with tunable band gap energies as a function of their size. Based on all of these promising properties that nanostructures exhibit, nanowires and quantum dots are excellent candidates for next-generation optoelectronic devices, including solar cells and light-emitting diodes. However, the realization of nanostructured materials for solar cell device applications is limited by the fundamental trade-off between light absorption and photocarrier collection. Vertically aligned ZnO nanowire arrays can decouple absorption and collection by acting as highly-conductive channels for extracting photogenerated electrons from deep within the film. This thesis illustrates a scheme for the development of ordered bulk heterojunction photovoltaic devices incorporating solution-based n-type doped ZnO nanowires and PbS quantum dots. In order to improve the electrical properties of ZnO nanowires, Al doping of hydrothermally synthesized ZnO nanowires is studied along with the optimization of doping concentration. The morphology of ZnO nanowire arrays is also studied as a function of the doping concentration in the growth solution. Finally, photovoltaic devices are fabricated and the effect of Al-doping of ZnO nanowires is investigated by device characterization techniques.
Author : Hatim Alnoor
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (12 download)
Download or read book Toward the Optimization of Low-temperature Solution-based Synthesis of ZnO Nanostructures for Device Applications written by Hatim Alnoor and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: One-dimensional (1D) nanostructures (NSs) of Zinc Oxide (ZnO) such as nanorods (NRs) have recently attracted considerable research attention due to their potential for the development of optoelectronic devices such as ultraviolet (UV) photodetectors and light-emitting diodes (LEDs). The potential of ZnO NRs in all these applications, however, would require synthesis of high crystal quality ZnO NRs with precise control over the optical and electronic properties. It is known that the optical and electronic properties of ZnO NRs are mostly influenced by the presence of native (intrinsic) and impurities (extrinsic) defects. Therefore, understanding the nature of these intrinsic and extrinsic defects and their spatial distribution is critical for optimizing the optical and electronic properties of ZnO NRs. However, identifying the origin of such defects is a complicated matter, especially for NSs, where the information on anisotropy is usually lost due to the lack of coherent orientation. Thus, the aim of this thesis is towards the optimization of the lowtemperature solution-based synthesis of ZnO NRs for device applications. In this connection, we first started with investigating the effect of the precursor solution stirring durations on the deep level defects concentration and their spatial distribution along the ZnO NRs. Then, by choosing the optimal stirring time, we studied the influence of ZnO seeding layer precursor’s types, and its molar ratios on the density of interface defects. The findings of these investigations were used to demonstrate ZnO NRs-based heterojunction LEDs. The ability to tune the point defects along the NRs enabled us further to incorporate cobalt (Co) ions into the ZnO NRs crystal lattice, where these ions could occupy the vacancies or interstitial defects through substitutional or interstitial doping. Following this, high crystal quality vertically welloriented ZnO NRs have been demonstrated by incorporating a small amount of Co into the ZnO crystal lattice. Finally, the influence of Co ions incorporation on the reduction of core-defects (CDs) in ZnO NRs was systematically examined using electron paramagnetic resonance (EPR).
