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Solution Synthesis And Characterization Of Silicon And Silicon Germanium Nanoparticles
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Book Synopsis Solution Synthesis and Characterization of Silicon and Silicon/germanium Nanoparticles by : Katherine Ann Pettigrew
Download or read book Solution Synthesis and Characterization of Silicon and Silicon/germanium Nanoparticles written by Katherine Ann Pettigrew and published by . This book was released on 2004 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterization of Silicon and Germanium Nanoparticles by : Jimmy Yi-Jie Jia
Download or read book Characterization of Silicon and Germanium Nanoparticles written by Jimmy Yi-Jie Jia and published by . This book was released on 2002 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of New Low-valent Silicon, Germanium and Tin Compounds by :
Download or read book Synthesis and Characterization of New Low-valent Silicon, Germanium and Tin Compounds written by and published by . This book was released on 2012 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Silicon and Germanium Nanocrystals and Titanium Disulphide Nanostructures by : Sujay Prabakar
Download or read book Synthesis and Characterization of Silicon and Germanium Nanocrystals and Titanium Disulphide Nanostructures written by Sujay Prabakar and published by . This book was released on 2010 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Silicon Nanoparticles by : Wenjie Qin
Download or read book Synthesis and Characterization of Silicon Nanoparticles written by Wenjie Qin and published by . This book was released on 2002 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Ge Nanoparticles for Flexible Thin-film Photovoltaics by : Hsiang Wei Chiu
Download or read book Synthesis and Characterization of Ge Nanoparticles for Flexible Thin-film Photovoltaics written by Hsiang Wei Chiu and published by . This book was released on 2005 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Silicon, Germanium, and Their Alloys by : Gudrun Kissinger
Download or read book Silicon, Germanium, and Their Alloys written by Gudrun Kissinger and published by CRC Press. This book was released on 2014-12-09 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite the vast knowledge accumulated on silicon, germanium, and their alloys, these materials still demand research, eminently in view of the improvement of knowledge on silicon–germanium alloys and the potentialities of silicon as a substrate for high-efficiency solar cells and for compound semiconductors and the ongoing development of nanodevices based on nanowires and nanodots. Silicon, Germanium, and Their Alloys: Growth, Defects, Impurities, and Nanocrystals covers the entire spectrum of R&D activities in silicon, germanium, and their alloys, presenting the latest achievements in the field of crystal growth, point defects, extended defects, and impurities of silicon and germanium nanocrystals. World-recognized experts are the authors of the book’s chapters, which span bulk, thin film, and nanostructured materials growth and characterization problems, theoretical modeling, crystal defects, diffusion, and issues of key applicative value, including chemical etching as a defect delineation technique, the spectroscopic analysis of impurities, and the use of devices as tools for the measurement of materials quality.
Book Synopsis Synthesis, Characterization, and Application of Silicon and Cu/Ge Nanomaterials by : Yi Zhai
Download or read book Synthesis, Characterization, and Application of Silicon and Cu/Ge Nanomaterials written by Yi Zhai and published by . This book was released on 2015 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicon nanocrystals (SiNCs) have been suggested as promising candidates for bioimaging because of their abundance, biocompatibility, and stable photoluminescent properties. However, "naked" SiNCs are insoluble in water and very reactive. As a result, NC surface functionalization is necessary to induce stability - fortunately this also offers the opportunity to target specific cell structures for imaging. This present thesis describes the preparation of photoluminescent D-mannose and L-alanine functionalized SiNCs obtained from the chlorination of hydride-terminated Si-NCs followed by reaction with appropriate carbohydrate and amino acid modifiers. Detailed characterization of the prepared nanoparticles was performed. Water soluble mannose and alanine functionalized SiNCs can be internalized by MCF-7 human breast cancer cells as shown in the detailed cell imaging studies. Copper germanide is an appealing metallization material for Si-based devices due to the low resistivity and oxidatively stable up to 520 °C. A synthetic method of copper-germanium alloy (Cu3Ge and Cu0.85Ge0.15) nanocrystals is described within this thesis. Copper-germanium alloy nanocrystals have been prepared by synthesis of Cu/GeO2 core shell nanocrystals (Cu@GeO2) followed by reductive thermal annealing process. This method affords freestanding, diameters of 70-300 nm copper-germanium alloy nanocrystals depend on the annealing temperature.
Book Synopsis Synthesis and Characterization of Silicon Nanowires, Silicon Nanorods, and Magnetic Nanocrystals by : Andrew Theron Heitsch
Download or read book Synthesis and Characterization of Silicon Nanowires, Silicon Nanorods, and Magnetic Nanocrystals written by Andrew Theron Heitsch and published by . This book was released on 2010 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicon nanowires, silicon nanorods, and magnetic nanocrystals have shown interesting size, shape, mechanical, electronic, and/or magnetic properties and many have proposed their use in exciting applications. However, before these materials can be applied, it is critical to fully understand their properties and how to synthesize them economically and reproducibly. Silicon nanowires were synthesized in high boiling point ambient pressure solvents using gold and bismuth nanocrystals seeds and trisilane as the silicon precursor. Reactions temperatures as low as 410°C were used to promote the solution-liquid-solid (SLS) growth of silicon nanowires. The silicon nanowires synthesis was optimized to produce 5 mg of silicon nanowires with average diameters of 30 nm and lengths exceeding 2 [mu]m by adjusting the silicon to gold ratio in the injection mixture and reaction temperature. Silicon nanorods were synthesized using a solution-based arrested-SLS growth approach where gold seeds, trisilane, and a dodecylamine were vital to the success. Dodecylamine was found to prevent gold seed coalescence at high temperatures -- creating small diameter rods -- and bond to the crystalline silicon surface -- preventing silicon nanorod aggregation. Furthermore, an etching strategy was developed using an emulsion of aqua regia and chloroform to remove the gold seeds from the silicon nanorods tip. A thin silicon shell surrounding the gold seed of the silicon nanorod was subsequently observed. Multifunctional colloidal core-shell nanoparticles of iron platinum or iron oxide encapsulated in fluorescent dye doped silica shells were also synthesized. The as-prepared magnetic nanocrystals are initially hydrophobic and were coated with a uniform silica shell using a microemulsion approach. These colloidal heterostructures have the potential to be used as dual-purpose tags, exhibiting a fluorescent signal that could be combined with enhanced magnetic resonance imaging contrast. Compositionally-ordered, single domain, antiferromagnetic L12 FePt3 and ferromagnetic L10 FePt nanocrystals were synthesized by coating colloidally-grown Pt-rich or stoichiometricly equal Fe-Pt nanocrystals with thermally-stable SiO2 and annealing at high temperature. Without the silica coating, the nanocrystals transform predominately into the L10 FePt phase due to interparticle diffusion of Fe and Pt atoms. Magnetization measurements of the L12 FePt3 nanocrystals revealed two antiferromagnetic transitions near the bulk Neél temperatures of 100K and 160K. Combining L12 FePt3 nanocrystals with L10 FePt nanocrystals was found to produce a constriction in field-dependent magnetization loops that has previously been observed near zero applied field in ensemble measurements of single domain silica-coated L10 FePt nanocrystals. Dipole interactions between FePt@SiO2 nanoparticles with varying SiO2 shell thickness was also explored.
Book Synopsis The Novel Synthesis of Silicon and Germanium Nanocrystallites by :
Download or read book The Novel Synthesis of Silicon and Germanium Nanocrystallites written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in the synthesis of semiconductor nanoparticles has been generated by their unusual optical and electronic properties arising from quantum confinement effects. We have synthesized silicon and germanium nanoclusters by reacting Zintl phase precursors with either silicon or germanium tetrachloride in various solvents. Strategies have been investigated to stabilize the surface, including reactions with RLi and MgBrR (R = alkyl). This synthetic method produces group IV nanocrystals with passivated surfaces. These nanoparticle emit over a very large range in the visible region. These particles have been characterized using HRTEM, FTIR, UV-Vis, solid state NMR, and fluorescence. The synthesis and characterization of these nanoclusters will be presented.
Book Synopsis Synthesis and Characterization of Silicon Nanoparticles for Bioimaging and Dynamic Nuclear Polarization Magnetic Resonance Imaging by : Tonya Marie Atkins
Book Synopsis Synthesis and Characterization of Silicon and Germanium Nanowires, Silica Nanotubes, and Germanium Telluride/tellurium Nanostructures by : Hsing-Yu Tuan
Download or read book Synthesis and Characterization of Silicon and Germanium Nanowires, Silica Nanotubes, and Germanium Telluride/tellurium Nanostructures written by Hsing-Yu Tuan and published by . This book was released on 2007 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heterostructured nanomaterials are interesting since they merge the properties of the individual materials and can be used in diverse applications. GeTe/Te heterostructures were synthesized by reacting diphenylgermane (DPG) and TOP-Te in the presence of organic surfactants. Aligned Te nanorods were grown on the surface facets of micrometer-size germanium telluride particles.
Book Synopsis Solution Preparation of Quantum-confined Germanium Nanoparticles, and Their Characterization by : Boyd Rex Taylor
Download or read book Solution Preparation of Quantum-confined Germanium Nanoparticles, and Their Characterization written by Boyd Rex Taylor and published by . This book was released on 1999 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Synthesis and Characterization of Germanium Nanoparticles and Nanowires and the Study of Their Potential in Photovoltaics by : Stephen Corey Codoluto
Download or read book The Synthesis and Characterization of Germanium Nanoparticles and Nanowires and the Study of Their Potential in Photovoltaics written by Stephen Corey Codoluto and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increasing energy demand of an overpopulated society has bolstered the interest in exploring renewable energy forms, one of which is solar energy. Current solar cell technology is neither an efficient nor cost-effective alternative to currently used fossil fuels. Nanostructured semiconductor building blocks are expected to play a central role in the development of next-generation cost-effective solar cell technology. Among the various materials that have been explored and studied, Ge holds particular promise due to it favorable band gap and good transport characteristic. A method to produce colloidal Ge nanocrystals, however, has not yet been established. Colloidal synthesis provides a scalable and cost-effective route to nanocrystalline semiconductor material as building blocks in low-cost PV energy conversion devices. This work describes the synthesis and characterization of Ge nanoparticles and Ge nanowires and their potential applications. Ge nanoparticles, 1.9 - 16.0 nm, are synthesized via colloidal synthesis by reducing germanium iodide using a strong reducing agent in various coordinating solvents. The effects of reaction and injection temperature, reaction time, and initial concentration are studied. A minimum temperature of 250 °C is required to crystallize Ge in a colloidal synthesis, below which only amorphous material is formed. An increase in reaction temperature from 250 to 300 °C has little effect on the final nanocrystal size and structure. A temperature of 200 °C was found to minimize crystal growth defects. Increasing or decreasing the injection temperature increased the crystal defects. The final crystalline products are analyzed using XRD, FTIR, TEM, HR-TEM, SEM, UV-vis spectroscopy, and PL to study oxidation, crystal structure, and optical properties. Spin coated germanium nanoparticles are combined with sputtered a-Si to create a polysilicon-Ge matrix which could direct charge transfer and decrease recombination of photogenerated charges. As a complementary nanocrystalline Ge building block nanowires were also synthesized by the thermal decomposition of DPG and TMG in supercritical hexane using a batch and a semicontinuous supercritical reactor. Up to 210 mg are synthesized and collected using this process with a diameter range of 20 nm to 60 nm and lengths up to 15 [MICRO SIGN]m. The continuously grown nanowire experimental yield is ~35%, compared to the batch experimental yield of 15%. The Ge nanowires were easily extracted from the collection vessel and characterized using TEM, SEM, and XRD to confirm the presence of Ge and to study the structure of the wires.
Book Synopsis Synthesis and Characterization of Germanium Nanowires and Germanium/silicon Radially Heterostructured Nanowires by : Irene Anne Goldthorpe
Download or read book Synthesis and Characterization of Germanium Nanowires and Germanium/silicon Radially Heterostructured Nanowires written by Irene Anne Goldthorpe and published by . This book was released on 2009 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Germanium-based Nanocrystals by : Hyun Gyung Kim
Download or read book Synthesis and Characterization of Germanium-based Nanocrystals written by Hyun Gyung Kim and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Approaches to colloidal synthesis have rapidly developed to control the size, shape, and composition of various semiconductors, offering cost reductions, controllability, and scalability. Of semiconductor materials, germanium nanomaterials are known to be the most difficult to synthesize in solution-based methods because of their high crystallization temperature. Zero-dimensional germanium nanocrystals were synthesized by the heat-up method, without any strong reducing agent. Subsequently, finely controlled size-selective precipitation narrowed size distributions, and size-selected nanocrystals successfully created a monolayer germanium nanocrystals superlattice. One-dimensional germanium nanorods were synthesized by the solution–liquid–solid method using tin nanoparticles as seeds. By forming a liquid alloy with the tin seed at the eutectic temperature, which is much lower than the crystallization temperature, germanium nanorods were grown from the tin seed. A monophenylsilane enhanced the yield of germanium nanorods by promoting the phenyl redistribution of diphenylgermane, a germanium precursor. Using a mixture of HCl and HF, tin seeds were completely removed from the tips of the germanium nanorods, leaving germanium crystalline nanorods. Nonvolatile memories, a key component in various electronics and portable systems, include phase-change memory, a leading technology that has seen exponential growth in demand over the last decade. One important class of phase change materials are compounds on the GeTe–Sb2Te3 tie line. Despite interesting properties of the nanomaterials, colloidal synthesis of phase change material nanocrystals has only been rarely reported. In the present study, three representative phase change material nanocrystals, GeTe, Sb2Te3, and Ge2Sb2Te5, were successfully synthesized using the hot-injection method. A poly(vinylpyrrolidinone)–hexadecane (PVP–HDE) polymer was essential for the nanocrystal dispersion and making ternary Ge2Sb2Te5 nanocrystals. Two solvents, oleylamine and trioctylphosphine, were studied for synthesizing all three nanocrystals and reveal the conversion chemistry of phase change material precursors
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
