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Hydrothermal Growth Of Zinc Oxide Nanorods Doped With Manganese
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Book Synopsis Hydrothermal Growth of Zinc Oxide Nanorods Doped with Manganese by : Rajni Bagga
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.
Book Synopsis Controlled Hydrothermal Growth of ZnO Nanorod Arrays by : Amir Hassanpour
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.
Book Synopsis Zinc Oxide Nanorods by : Kai-Hang Tam
Download or read book Zinc Oxide Nanorods written by Kai-Hang Tam and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Zinc Oxide Nanorods: Hydrothermal Growth, Properties and Applications" by Kai-hang, Tam, 譚啟鏗, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled ZINC OXIDE NANORODS: HYDROTHERMAL GROWTH, PROPERTIES AND APPLICATIONS Submitted by Tam Kai Hang for the degree of Master of Philosophy at The University of Hong Kong in December 2007 One-dimensional wide band-gap semiconductor nanostructures, such as nanorods, nanowires and nanobelts, have recently attracted much attention for their potential use as fundamental building blocks for new generation of electronic and photonic devices. Various semiconducting 1-D nanostructures have been synthesized, such as TiO, SnO, 2 2 GaN, GaAs, Si and ZnO. Among these nanostructures, zinc oxide (ZnO) has became particularly intersting in optoelectronic, field emission, gas sensing and biomedicine applications. ZnO is a wide band-gap (3.37 eV) semiconductor with high excitonic binding energy ( 60 meV), and it is non-toxic and environmentally friendly. Hydrothermal growth of ZnO provides an inexpensive method to fabricate large amounts of ZnO nanorods or nanowires on various substrates. However, the controversies still remain about the native defects in ZnO. In this work, ZnO nanorod arrays were fabricated by a hydrothermal method. The structural properties were characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray diffraction (XRD). Well-oriented nanorods, which exhibited strong defect-related photoluminescence (PL) were obtained. Stimulated UV emission was achieved in forming gas or oxygen annealed nanorods. Change in lasing threshold and defect emission, as well as spontaneous decay time, indicated that yellow defect emission was not caused by interstitial oxygen, which was commonly assumed to be dominant in the yellow emitted ZnO. The origins of defects emissions were investigated by x-ray photoelectron spectroscopy (XPS) and positron annihilation spectroscopy (PAS). The results showed that yellow emission of the as-grown nanorods originated from the presence of Zn(OH) on surface, while the green emission which appeared after annealing was due to the defect complex related to zinc vacancy. On the other hand, it was also observed that green emission originated from grain boundary in other ZnO nanostructures, such as nanoshells. The origin of the green emission has not yet been determined, but there was evidence that the emission was surface-related. Heterojunction of n-ZnO nanorod arrays / p-GaN film light-emitting-diodes (LEDs) were fabricated. Influence of annealing conditions on the performance of devices was examined. It was found that the position of recombination zone was shifted after annealing in some cases. Emission wavelength could be controlled through annealing processes. This study could help improve the performance of these heterojunction devices. In order to have more comprehensive studies on applications of these versatile ZnO nanorods, antibacterial properties of the nanorods were investigated. ZnO nanorods coating have exhibited great antibacterial activity. Other ZnO morphologies (nanoparticles and powder) were also studies for comparison. Mechanisms of ZnO against different bacteria were investigated. It was found that damaging of E. coli cell was partly due to the relaxation of hydrogen peroxide (H O ) from the structures. 2 2 DOI: 10.5353/th_b3955734 Subjects: Zinc oxide Nanostructures Nanotechnology
Book Synopsis Zinc Oxide and Manganese Doped Zinc Oxide Nanoparticles by : Yadollah Abdollahi
Download or read book Zinc Oxide and Manganese Doped Zinc Oxide Nanoparticles written by Yadollah Abdollahi and published by LAP Lambert Academic Publishing. This book was released on 2012-06 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book consists of synthesis and characterization of ZnO and Mn-doped ZnO nanoparticles for photocatalyst process. The work contains synthesis (co- precipitation), Characterization (TEM, SEM, EDX, FTIR, XRD, BET, UV-visible NIR) and application of ZnO and Mn-doped ZnO nanoparticles. The application included photodegradation of m-, o- and p-cresol that was carried out under UV and visible irradiation at room temperature, atmospheric pressure, and different PH by batch photoreactors. The intermediates were identified by UPLC and mineralization was confirmed by TOC measurement. As a result, 1%wt Mn-doped ZnO with lower particles size, higher surface area, high cresols adsorption, lower agglomerate, appropriate band gap and higher photodegradation ability than other % of Mn-doped ZnO is the best photocatalyst that may enhance the photocatalyst activity of ZnO under visible light. "
Book Synopsis Zinc-Based Nanostructures for Environmental and Agricultural Applications by : Kamel A. Abd-Elsalam
Download or read book Zinc-Based Nanostructures for Environmental and Agricultural Applications written by Kamel A. Abd-Elsalam and published by Elsevier. This book was released on 2021-05-22 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc-Based Nanostructures for Environmental and Agricultural Applications shows how zinc nanostructures are being used in agriculture, food and the environment. The book has been divided into two parts: Part I deals with the synthesis and characterization of zinc-based nanostructures such as biogenic, plant, microbial, and actinobacteria mediated synthesis of zinc nanoparticles, Part II is focused on agri-food applications such as antibacterial, antifungal, antimicrobial, plant disease management, controlling post-harvest diseases, pesticide sensing and degradations, plant promotions, ZnO nanostructure for food packaging application, safe animal food and feed supplement, elimination of mycotoxins, and veterinary applications. Part III reviews technological developments in environmental applications such as risks and benefits for aquatic organisms and the marine environment, antiseptic activity and toxicity mechanisms, wastewater treatment, and zinc oxide-based nanomaterials for photocatalytic degradation of environmental and agricultural pollutants. The book discusses various aspects, including the application of zinc-based nanostructures to enhance plant health and growth, the effect on soil microbial activity, antimicrobial mechanism, phytotoxicity and accumulation in plants, the possible impact of zinc-based nanostructures in the agricultural sector as nanofertilizer, enhancing crop productivity, and other possible antimicrobial mechanisms of ZnO nanomaterials. Explores the impact of a large variety of zinc-based nanostructures on agri-food and environment sectors Outlines how the properties of zinc-based nanostructures mean they are particularly efficient in environmental and agricultural application areas Assesses the major challenges of synthesizing and processing zinc-based nanostructured materials
Book Synopsis Zinc Oxide Nanorods by : Kai-hang Tam
Download or read book Zinc Oxide Nanorods written by Kai-hang Tam and published by . This book was released on 2007 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Growth of Aligned Sb- and Ga-doped Zinc Oxide Nanorod Arrays Using Hydrothermal for Triboelectric Nanogenerators by : 陳幸男
Download or read book Growth of Aligned Sb- and Ga-doped Zinc Oxide Nanorod Arrays Using Hydrothermal for Triboelectric Nanogenerators written by 陳幸男 and published by . This book was released on 2020 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Book Synopsis Zinc Oxide Nanostructures: Synthesis and Characterization by : Sotirios Baskoutas
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
Book Synopsis Zinc Oxide Nanostructures by : Magnus Willander
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
Book Synopsis Nanostructured Materials by : Mohindar Seehra
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.
Book Synopsis Nanostructured Zinc Oxide by : Kamlendra Awasthi
Download or read book Nanostructured Zinc Oxide written by Kamlendra Awasthi and published by Elsevier. This book was released on 2021-08-10 with total page 781 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured Zinc Oxide covers the various routes for the synthesis of different types of nanostructured zinc oxide including; 1D (nanorods, nanowires etc.), 2D and 3D (nanosheets, nanoparticles, nanospheres etc.). This comprehensive overview provides readers with a clear understanding of the various parameters controlling morphologies. The book also reviews key properties of ZnO including optical, electronic, thermal, piezoelectric and surface properties and techniques in order to tailor key properties. There is a large emphasis in the book on ZnO nanostructures and their role in optoelectronics. ZnO is very interesting and widely investigated material for a number of applications. This book presents up-to-date information about the ZnO nanostructures-based applications such as gas sensing, pH sensing, photocatalysis, antibacterial activity, drug delivery, and electrodes for optoelectronics. Reviews methods to synthesize, tailor, and characterize 1D, 2D, and 3D zinc oxide nanostructured materials Discusses key properties of zinc oxide nanostructured materials including optical, electronic, thermal, piezoelectric, and surface properties Addresses most relevant zinc oxide applications in optoelectronics such as light-emitting diodes, solar cells, and sensors
Book Synopsis Properties of Al-Doped ZnO Nanorods Synthesized Using Low Temperature Hydrothermal Method by :
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:
Book Synopsis Handbook of Nanoelectrochemistry by : Mahmood Aliofkhazraei
Download or read book Handbook of Nanoelectrochemistry written by Mahmood Aliofkhazraei and published by Springer. This book was released on 2015-11-03 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited book is devoted to different electrochemical aspects of nano materials. This comprehensive reference text is basically divided in 3 parts: electrochemical synthesis routes for nanosized materials, electrochemical properties of nano materials and electrochemical characterization methods for nanostructures. The Handbook is a reference work to chemists and materials scientists interested in the nano aspects of electrochemistry. The chapters are written by a number of international experts in the field and the content will assist members of both electrochemical and materials communities to keep abreast of developments in the field.
Book Synopsis Multifunctional Oxide-Based Materials: From Synthesis to Application by : Teofil Jesionowski
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
Book Synopsis Electrochemical Energy Conversion and Storage Systems for Future Sustainability by : Aneeya Kumar Samantara
Download or read book Electrochemical Energy Conversion and Storage Systems for Future Sustainability written by Aneeya Kumar Samantara and published by CRC Press. This book was released on 2020-11-16 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new volume discusses new and well-known electrochemical energy harvesting, conversion, and storage techniques. It provides significant insight into the current progress being made in this field and suggests plausible solutions to the future energy crisis along with approaches to mitigate environmental degradation caused by energy generation, production, and storage. Topics in Electrochemical Energy Conversion and Storage Systems for Future Sustainability: Technological Advancements address photoelectrochemical catalysis by ZnO, hydrogen oxidation reaction for fuel cell application, and miniaturized energy storage devices in the form of micro-supercapacitors. The volume looks at the underlying mechanisms and acquired first-hand information on how to overcome some of the critical bottlenecks to achieve long-term and reliable energy solutions. The detailed synthesis processes that have been tried and tested over time through rigorous attempts of many researchers can help in selecting the most effective and economical ways to achieve maximum output and efficiency, without going through time-consuming and complex steps. The theoretical analyses and computational results corroborate the experimental findings for better and reliable energy solutions.
Book Synopsis Cathodoluminescence by : Naoki Yamamoto
Download or read book Cathodoluminescence written by Naoki Yamamoto and published by BoD – Books on Demand. This book was released on 2012-03-28 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cathodoluminescence (CL) is a non-destructive technique to characterize optical and electronic properties of nanostructures in many kinds of materials. Major subject is to investigate basic parameters in semiconductors, impurities in oxides and phase determination of minerals. CL gives information on carrier concentration, diffusion length and life time of minority carriers in semiconductors, and impurity concentration and phase composition in composite materials. This book involves 13 chapters to present the basics in the CL technique and applications to particles, thin films and nanostructures in semiconductors, oxides and minerals. The chapters covered in this book include recent development of CL technique and applications to wide range of materials used in modern material science.
