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Synthesis Electrical Properties And Optical Characterization Of Hybrid Zinc Oxide Polymer Thin Films And Nanostructures
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Book Synopsis Synthesis, Electrical Properties, and Optical Characterization of Hybrid Zinc Oxide/polymer Thin Films and Nanostructures by : Masashi Matsumura
Download or read book Synthesis, Electrical Properties, and Optical Characterization of Hybrid Zinc Oxide/polymer Thin Films and Nanostructures written by Masashi Matsumura and published by . This book was released on 2007 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transparent Conductive Materials by : David Levy
Download or read book Transparent Conductive Materials written by David Levy and published by John Wiley & Sons. This book was released on 2018-10-29 with total page 501 pages. Available in PDF, EPUB and Kindle. Book excerpt: Der Herausgeber ist ein bekannter Pionier des Fachgebiets mit über 30 Jahren Erfahrung. Dieses Handbuch bietet einen umfassenden Überblick über transparente leitfähige Materialien und legt dabei den Schwerpunkt auf praktische Anwendungen. Nach einer Einführung in die Materialien und jüngsten Entwicklungen werden die Synthese und Charakterisierung sowie Beschichtungsverfahren erläutert, die für die Energiegewinnung und bei lichtemittierenden Anwendungen häufig zum Einsatz kommen. Zukünftige technologische Fortschritte werden am Ende des Buches erörtert. Dieses umfassende und aktuelle interdisziplinäre Fachbuch deckt das komplette Spektrum ab, von der Chemie und den Materialwissenschaften zum Ingenieurswesen, von Lehre und Forschung bis zur Industrie, von den grundlegenden Herausforderungen hin zu direkt verfügbaren Anwendungen.
Book Synopsis Zinc Oxide Bulk, Thin Films and Nanostructures by : Chennupati Jagadish
Download or read book Zinc Oxide Bulk, Thin Films and Nanostructures written by Chennupati Jagadish and published by Elsevier. This book was released on 2011-10-10 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: With an in-depth exploration of the following topics, this book covers the broad uses of zinc oxide within the fields of materials science and engineering: - Recent advances in bulk , thin film and nanowire growth of ZnO (including MBE, MOCVD and PLD), - The characterization of the resulting material (including the related ternary systems ZgMgO and ZnCdO), - Improvements in device processing modules (including ion implantation for doping and isolation ,Ohmic and Schottky contacts , wet and dry etching), - The role of impurities and defects on materials properties - Applications of ZnO in UV light emitters/detectors, gas, biological and chemical-sensing, transparent electronics, spintronics and thin film
Book Synopsis SYNTHESIS AND CHARACTERIZATION OF TRANSPARENT CONDUCTIVE ZINC OXIDE THIN FILMS BY SOL-GEL SPIN COATING METHOD by : David Winarski
Download or read book SYNTHESIS AND CHARACTERIZATION OF TRANSPARENT CONDUCTIVE ZINC OXIDE THIN FILMS BY SOL-GEL SPIN COATING METHOD written by David Winarski and published by . This book was released on 2015 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc oxide has been given much attention recently as it is promising for various semiconductor device applications. ZnO has a direct band gap of 3.3 eV, high exciton binding energy of 60 meV and can exist in various bulk powder and thin film forms for different applications. ZnO is naturally n-type with various structural defects, which sparks further investigation into the material properties. Although there are many potential applications for this ZnO, an overall lack of understand and control of intrinsic defects has proven difficult to obtain consistent, repeatable results. This work studies both synthesis and characterization of zinc oxide in an effort to produce high quality transparent conductive oxides. The sol-gel spin coating method was used to obtain highly transparent ZnO thin films with high UV absorbance. This research develops a new more consistent method for synthesis of these thin films, providing insight for maintaining quality control for each step in the procedure. A sol-gel spin coating technique is optimized, yielding highly transparent polycrystalline ZnO thin films with tunable electrical properties. Annealing treatment in hydrogen and zinc atmospheres is researched in an effort to increase electrical conductivity and better understand intrinsic properties of the material. These treatment have shown significant effects on the properties of ZnO. Characterization of doped and undoped ZnO synthesized by the sol-gel spin coating method was carried out using scanning electron microscopy, UV-Visible range absorbance, X-ray diffraction, and the Hall Effect. Treatment in hydrogen shows an overall decrease in the number of crystal phases and visible absorbance while zinc seems to have the opposite effect. The Hall Effect has shown that both annealing environments increase the n-type conductivity, yielding a ZnO thin film with a carrier concentration as high as 3.001 × 1021 cm-3.
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 ZnO and Their Hybrid Nano-Structures by : Gaurav Sharma
Download or read book ZnO and Their Hybrid Nano-Structures written by Gaurav Sharma and published by Materials Research Forum LLC. This book was released on 2023-06-05 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: ZnO and its hybrid nanostructures have unique optical, physical and chemical properties. The book covers recent trends in processing techniques and applications. Topics include solar cells, photo-voltaic devices, fuel cells, uv filters, lasers, light-emitting diodes, photo-detectors, spin-tronic devices, magnetic semiconductors, nano-generators, piezotronics, photo-catalytic applications against harmful organic pollutants like dyes, heavy metals, antibiotics, and sensors such as bio sensors, chemical sensors, gas sensors. Keywords: ZnO, Nano ZnO, Point Defects, Magnetic Semiconductors, Hybrid Nanostructures, Cell Applications, Nanoadsorbant for Heavy Metal Removals, Diagnostics, ZnO Nano-Carriers, ZnO Thin Films Fabrication.
Book Synopsis Nanostructured Metal Oxides and Devices by : M. K. Jayaraj
Download or read book Nanostructured Metal Oxides and Devices written by M. K. Jayaraj and published by Springer Nature. This book was released on 2020-04-16 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book primarily covers the fundamental science, synthesis, characterization, optoelectronic properties, and applications of metal oxide nanomaterials. It discusses the basic aspects of synthetic procedures and fabrication technologies, explains the related experimental techniques and also elaborates on the current status of nanostructured oxide materials and related devices. Two major aspects of metal oxide nanostructures – their optical and electrical properties – are described in detail. The first five chapters focus on the optical characteristics of semiconducting materials, especially metal oxides at the nanoscale. The following five chapters discuss the electrical properties observed in metal oxide-based semiconductors and the status quo of device-level developments in a variety of applications such as sensors, transistors, dilute magnetic semiconductors, and dielectric materials. The basic science and mechanism behind the optoelectronic phenomena are explained in detail, to aid readers interested in the structure–property symbiosis in semiconducting nanomaterials. In short, the book offers a valuable reference guide for researchers and academics in the areas of material science and semiconductor technology, especially nanophotonics and electronics.
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 Metal Oxide Nanostructures by : Daniela Nunes
Download or read book Metal Oxide Nanostructures written by Daniela Nunes and published by Elsevier. This book was released on 2018-11-01 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal Oxide Nanostructures: Synthesis, Properties and Applications covers the theoretical and experimental aspects related to design, synthesis, fabrication, processing, structural, morphological, optical and electronic properties on the topic. In addition, it reviews surface functionalization and hybrid materials, focusing on the advantages of these oxide nanostructures. The book concludes with the current and future prospective applications of these materials. Users will find a complete overview of all the important topics related to oxide nanostructures, from the physics of the materials, to its application. Delves into hybrid structured metal oxides and their promising use in the next generation of electronic devices Includes fundamental chapters on synthesis design and the properties of metal oxide nanostructures Provides an in-depth overview of novel applications, including chromogenics, electronics and energy
Book Synopsis Metal Oxide Nanocomposite Thin Films for Optoelectronic Device Applications by : Rayees Ahmad Zargar
Download or read book Metal Oxide Nanocomposite Thin Films for Optoelectronic Device Applications written by Rayees Ahmad Zargar and published by John Wiley & Sons. This book was released on 2023-11-07 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: METAL OXIDE NANOCOMPOSITE THIN FILMS FOR OPTOELECTRONIC DEVICE APPLICATIONS The book provides insight into the fundamental aspects, latest research, synthesis route development, preparation, and future applications of metal oxide nanocomposite thin films. The fabrication of thin film-based materials is important to the future production of safe, efficient, and affordable energy as the devices convert sunlight into electricity. Thin film devices allow excellent interface engineering for high-performance printable solar cells as their structures are highly reliable and stand-alone systems can provide the required megawatts. They have been used as power sources in solar home systems, remote buildings, water pumping, megawatt-scale power plants, satellites, communications, and space vehicles. Metal Oxide Nanocomposite Thin Films for Optoelectronic Device Applications covers the basics of advanced nanometal oxide-based materials, their synthesis, characterization, and applications, and all the updated information on optoelectronics. Topics discussed include the implications of metal oxide thin films, which are critical for device fabrications. It provides updated information on the economic aspect and toxicity, with great focus paid to display applications, and covers some core areas of nanotechnology, which are particularly concerned with optoelectronics and the available technologies. The book concludes with insights into the role of nanotechnology and the physics behind photovoltaics. Audience The book will be an important volume for electronics and electrical engineers, nanotechnologists, materials scientists, inorganic chemists in academic research, and those in industries, exploring the applications of nanoparticles in semiconductors, power electronics, and more.
Book Synopsis Oxide Thin Films, Multilayers, and Nanocomposites by : Paolo Mele
Download or read book Oxide Thin Films, Multilayers, and Nanocomposites written by Paolo Mele and published by Springer. This book was released on 2015-03-26 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive overview of the science of nanostructured oxides. It details the fundamental techniques and methodologies involved in oxides thin film and bulk growth, characterization and device processing, as well as heterostructures. Both, experts in oxide nanostructures and experts in thin film heteroepitaxy, contribute the interactions described within this book.
Book Synopsis Synthesis, Characterization, Structural, and Optical Properties of Zinc Oxide Nanostructures Embedded in Silicon Based Substrates by : Bimal Pandey
Download or read book Synthesis, Characterization, Structural, and Optical Properties of Zinc Oxide Nanostructures Embedded in Silicon Based Substrates written by Bimal Pandey and published by . This book was released on 2014 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Silicon-Based Hybrid Nanoparticles by : Sabu Thomas
Download or read book Silicon-Based Hybrid Nanoparticles written by Sabu Thomas and published by Elsevier. This book was released on 2021-09-24 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicon-Based Hybrid Nanoparticles: Fundamentals, Properties, and Applications focuses on the fundamental principles and promising applications of silicon-based hybrid nanoparticles in nanoelectronics, energy storage/conversion, catalysis, sensors, biomedicine, environment and imaging. This book is an important reference source for materials scientists and engineers who are seeking to understand more about the major properties and applications of silicon-based hybrid nanoparticles. As the hybridization of silicon nanoparticles with other semiconductors or metal oxides nanoparticles may exhibit superior features, when compared to lone, individual nanoparticles, this book provides the latest insights. In addition, the silicon/iron oxide hybrid nanoparticles also possess excellent fluorescence, super-paramagnetism, and biocompatibility that can be effectively used for the diagnostic imaging system in vivo. Similarly, gold-silicon nanohybrids could be used as highly efficient near-infrared hyperthermia agents for cancer cell destruction. Outlines the major thermal, electrical, optical, magnetic and toxic properties of silicon-based hybrid nanoparticles Describes major applications in energy, environmental science and catalysis Assesses the major challenges to manufacturing silicon-based nanostructured materials on an industrial scale
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nanocrystalline Zinc Oxide Thin Films for Solar Cell by : Akbar I. Inamdar
Download or read book Nanocrystalline Zinc Oxide Thin Films for Solar Cell written by Akbar I. Inamdar and published by LAP Lambert Academic Publishing. This book was released on 2010-12 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc oxide has attracted considerable attention due to its good optical, electrical, and piezoelectric properties and its potential applications in diverse areas. The novel functions of ZnO nanostructures arrays have been revealed successfully in the solar cells, gas sensors, piezoelectric, photodetectcors, LED, field emitters and so on. Films with well-aligned ZnO nanorods or nanowires may exhibit much larger surface areas than ZnO films prepared from randomly oriented nanoparticles. A plethora of physical and chemical methods have been used for the synthesis of ZnO nanostructures including physical and chemical techniques. Electrodeposition is of particular interest due to low cost, environmental friendly, and feasibility of room temperature growth. The central idea of this work is to test the applicability of simple and inexpensive electrodeposition technique as an update on previously studied methods for the synthesis of nanocrystalline ZnO thin films for solar cell. In this direction the attempts were made to fabricate zinc oxide nanocrystalline thin films by varying various process parameters and by using novel approaches, as well.
Book Synopsis Electrical properties of gas-phase synthesized nanoparticles by : Sonja Hartner
Download or read book Electrical properties of gas-phase synthesized nanoparticles written by Sonja Hartner and published by Cuvillier Verlag. This book was released on 2012-09-07 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract Zinc oxide (ZnO) doped with aluminum receives increasing attention for being an alternative material for the established but much more expensive indium tin oxide (ITO) due to the fact, that it has comparable electrical and optical properties. The electrical properties of mechanically compacted pellets prepared from nanosized ZnO powders are investigated using impedance spectroscopy. The impedance of the samples is measured in hydrogen and in synthetic air between room temperature and 400◦C. In both atmospheres, the measurements show two different electrical transport processes depending on the temperature and the doping level. In synthetic air, the conductivity increases for doping concentrations up to 7.74% of aluminum and collapses for higher doping levels. In hydrogen atmosphere, the conductivity decreases with rising doping level of Al. This behavior can be explained by generation of free charge carriers due to the incorporation of hydrogen and doping with aluminum, respectively. At higher temperatures and at high doping concentrations, scattering processes at grain boundaries as well as lattice defects increasingly affect the charge carrier transport processes leading to a decreasing overall conductivity. The electrical conductivity shows reversible behavior when the atmosphere is changed from hydrogen to ambient conditions and back. To replace ITO in applications, transparent conductive layers with good electrical and optical properties are required. ZnO dispersions are prepared and printed on pre-structured substrates by ink-jet printing to investigate the electrical and sensing properties of printed films. The properties are measured without any annealing steps from room temperature up to 200◦C in ambient conditions and in hydrogen atmosphere using impedance spectroscopy. Compared to the measurements in air, the resistance in hydrogen decreases by a factor of five even at room temperature. The ink-jet printed ZnO films with nanosized particles can be used as sensor without any annealing or post-processing for sensing. Silicon (Si) nanoparticles are envisioned for a broad range of applications, ranging from electroluminescent devices over biomarkers and lithium ion batteries to solar cells. One of the major challenges with respect to these applications is to effectively stabilize the silicon particles against oxidation. Electrical properties of as-prepared as well as functionalized silicon nanoparticles are investigated. The native oxide shell of the as-prepared silicon nanoparticles is removed and the electrical properties are measured and a re-oxidation of the silicon nanoparticles can be observed after a few hours. A fast and efficient process to functionalize silicon nanoparticles with n-alkenes is introduced. The freshly etched particles are subsequently grafted with even-numbered n-alkenes from C6 to C18 in order to prevent the particles from re-oxidation. FTIR spectra are used to confirm the successful attachment of the organic molecules and provide insight into the binding mechanism. Electrical properties are investigated by impedance spectroscopy showing the effect of surface functionalization on the conductivity of compacted nanoparticle ensembles. It is observed that particles covered with alkenes from C6 to C12 exhibit higher conductivity than the as-prepared materials, while surface functionalization with C14 and higher leads to almost insulating nanoparticle arrays. Despite freshly etched silicon nanoparticles, dodecene-terminated particles showed the best conductivity as well as a very good long-term stability against oxidation. FTIR spectroscopy indicated that particles stabilized with C6 to C10 are less stable due to a creeping re-oxidation. The most promising results is the functionalization of silicon nanoparticles with alkenes with twelve carbon atoms (C12). A variable range hopping transport mechanism or a charge carrier limited transport mechanism exist for all silicon nanoparticles. Especially for the functionalized particles, a dependence of the hopping distances can be observed. This does not mean that the charge carriers use the shortest way but the energetically most advantageous. Kurzzusammenfassung Zur Zeit wird Zinkoxid (ZnO) als aussichtsreicher Kandidat zum Ersatz des sehr teuren Indium Zinn Oxids (ITO) angesehen, da es vergleichbare elektrische und optische Eigenschaften zum ITO besitzt. Die elektrischen Eigenschaften von mechanisch kompaktierten Formkörpern aus ZnO-Nanopartikeln werden mittels der Impedanzspektroskopie untersucht. Die Impedanz der Proben wird in Wasserstoffatmosphäre und synthetischer Luft bis hin zu 400◦C untersucht. Die Messungen in Wasserstoffumgebung und synthetischer Luft zeigen unterschiedliche Ergebnisse, abhängig von Temperatur und Dotierkonzentration. In synthetischer Luft steigt die Leitfähigkeit bis zu einer Dotierkonzentration mit Aluminium (Al) von 7,7% an und bricht für höhere Al-Konzentrationen ein. Unter Wasserstoffatmosphäre sinkt die Leitfähigkeit mit zunehmender Al-Dotierkonzentration. Dieses Verhalten kann mit einer Bildung von freien Ladungsträgern aufgrund der Wasserstoffdotierung aus der Umgebung und der entsprechend ansteigenden Al-Konzentration erklärt werden. Zu höheren Temperaturen und Dotierkonzentrationen treten vermehrt Stoßprozesse an Korngrenzen und Gitterdefekten auf, die den Transport der Ladungsträger unterbrechen. Die unterschiedliche Leitfähigkeit zeigt reversibles Verhalten, wenn von Wasserstoffatmosphäre zu synthetischer Luft und zurück gewechselt wird. Für die Anwendung von ZnO für transparent leitfähige Filme und Sensoren aus kostengünstigen Materialien, werden stabile Dispersionen mit sehr kleinen (halb-) leitenden Partikeln im Nanometerbereich benötigt. Stabile ZnO-Dispersionen wurden hergestellt und auf vorstrukturierte Substrate mittels Ink-Jet Druckverfahren aufgebracht. Die elektrischen Senoreigenschaften der gedruckten Schichten wurden bis 200◦C in Umgebungsluft vermessen. Vor den Impedanzmessungen wurden die Schichten nicht ausgeheilt. Verglichen zu den Messungen in Luft wurde beobachtet, dass sich der Widerstand der Schicht unter Wasserstoffatmosphäre bei Raumtemperatur um einen Faktor von fünf reduziert. Die hergestellten, gedruckten ZnO-Schichten zeigen ein gutes Anprechverhalten auf Wasserstoff und sind ohne vorherige Ausheilprozesse zu verwenden. Siliziumpartikel werden gegenwärtig für eine Vielzahl an Anwendungen benutzt. Diese Anwendungen reichen von elektrolumineszierenden Bauteilen über Biomarker und Lithium-Ionen Batterien bis hin zu Solarzellen. Eine der Aufgaben zur Verbesserung der Eigenschaften ist das Auffinden einer Methode zur Stabilisierung der Siliziumoberfläche gegen die Oxidation. Die vorhandene Oxidhülle um das Siliziumnanopartikel nach der Synthese wird entfernt. Die elektrischen Eigenschaften der frisch geätzen Partikel werden gemessen und eine schnelle Reoxidation der Partikel wird innerhalb von Stunden beobachtet. Ein schneller und effektiver Prozess zur Funktionalisierung mit n-Alkenen wird vorgestellt. Die Partikel werden mit unterschiedlich langen Alkenen von C6 bis C18 präpariert um eine Reoxidation der Partikel nach dem Ätzprozess zu verhindern. Mit Hilfe von FTIR Messungen wird die erfolgreiche Anbringung der organischen Moleküle an die Siliziumoberfläche gezeigt. Elektrische Messungen werden mittels der Impedanzspektroskopie durchgeführt, um den Effekt der Funktionalisierung mit den unterschiedlichen Alkenen auf die elektrische Leitfähigkeit hin zu untersuchen. Es zeigt sich eine höhere Leitfähigkeit für alle Siliziumnanopartikel die mit den Alkenen von C6 bis C12 funktionalisiert werden. Die Partikel, die mit Alkenen von einer Kettenlänge von C14 und höher funktionalisiert werden, zeigen eine sehr niedrige Leitfähigkeit, die teilweise schlechter als die von den Silizium Partikeln im Ursprungszustand ist. Die Funktionalisierung mit dem Alken C12 zeigt die besten Ergebnisse und ist auch nach über einen halben Jahr in den elektrischen Eigenschaften stabil. Mit FTIR Messungen wird gezeigt, dass die Partikel, die mit C6 und C10 funktionalisiert werden, keine vollständige Stabilität gegen Reoxidation besitzen. Die Funktionalisierung von Silizium mit Dodecen ist am stabilsten gegenüber Reoxidation und zeigt die besten elektrischen Eigenschaften. Es ist ein ”variable range hopping” Transportmechanimus für die Ladungsträger zwischen den Partikeln zu beobachten. Besonders für die funktionalisierten Partikel ist die zurückgelegte Distanz der Ladungsträger abhängig von der Art der Funktionalisierung. Dies bedeutet aber nicht, dass der Ladungsträger den kürzesten Weg nimmt, sondern den energetisch günstigsten.
Book Synopsis Synthesis and Characterization of ZnO/Graphene Nanostructures for Electronics and Photocatalysis by : Seyed Ebrahim Chalangar
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.
