Au, Ag, Cu and their core-shell nanoparticles: synthesis, self-assembly and tunable optical properties.

碩士 === 國立交通大學 === 材料科學與工程系所 === 97 ===  This thesis contains three main topics: synthesis, self-assembling dispersions and the optical properties of various metallic nanoparticles. Firstly, we have successfully synthesized pure Ag, Au, and Cu nanoparticles as well as core-shelled Au/Ag, and Au/Cu na...

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Main Authors: Chang, Chia-Lun, 張嘉倫
Other Authors: Chen, Chun-Hua
Format: Others
Language:zh-TW
Published: 2009
Online Access:http://ndltd.ncl.edu.tw/handle/07287895945268657498
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spelling ndltd-TW-097NCTU51590532015-10-13T15:42:33Z http://ndltd.ncl.edu.tw/handle/07287895945268657498 Au, Ag, Cu and their core-shell nanoparticles: synthesis, self-assembly and tunable optical properties. 金、銀、銅及其核殼奈米粒子之合成、自組裝及其光學特性之研究 Chang, Chia-Lun 張嘉倫 碩士 國立交通大學 材料科學與工程系所 97  This thesis contains three main topics: synthesis, self-assembling dispersions and the optical properties of various metallic nanoparticles. Firstly, we have successfully synthesized pure Ag, Au, and Cu nanoparticles as well as core-shelled Au/Ag, and Au/Cu nanoparticles by the polyol process. According to TEM analysis, the mean diameters of nanoparticles prepared were found to be smaller than 20 nm with a narrow size distribution. In the polyol process, PVP acts as a nucleation promoting agent for nanoparticles, a stabilizer for mono-dispersion, and a protective agent for oxidation. By varying the reaction temperature and PVP concentration, nanoparticles with different structures can be obtained for the further study.  Nanoparticles usually exhibit distinct structures as well as properties comparing with bulk materials. In order to distinguish these special structures, FCC, Decahedron and Icosahedrons, by nondestructive characterization of X-ray diffraction, a serious of theoretical X-ray diffraction patterns were calculated and compared with experimental data. The results clearly show that X-ray diffraction can effectively distinguish these structures and is in good agreement with the observation of HRTEM.  For the optical examinations, the nanoparticles prepared were dispersed onto the optical glass by two ways, i.e. typical spin-coating and block-copolymer self-assembling methods. For the prior method, the washed Ag, Au, Cu, Au/Ag and Au/Cu nanoparticles were dissolved in the ethylene-glycol, and then spun with low speed to obtain nanoparticle thin film with various film thicknesses. For the posterior method, PVP-coated Ag nanoparticles were added into the block copolymer PS-P2VP micellar solution, and then spun with high speed to prepare self-assembly Ag nanoparticle thin films. Following with annealing treatments, various periodic patterns of Ag nanoparticle thin films were obtained. The absorption spectra of nanoparticle solutions and the obtained nanoparticle thin films with various thicknesses were then characterized by UV-vis spectrum spectroscopy. In our research, we have successfully simulated the absorption spectra of Ag, Au, Cu, Au/Ag and Au/Cu nanoparticle solutions based on Mie theory. A dramatic change on the absorption spectra was found between aqueous solutions of nanoparticles and nanoparticle thin films. The peak position of the thin film is greatly red-shifted from the general position observed for the nanoparticles in the aqueous solution. With the thickness increases, red-shifts were initially enhanced and then to reach a saturated value. Chen, Chun-Hua 陳軍華 2009 學位論文 ; thesis 124 zh-TW
collection NDLTD
language zh-TW
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sources NDLTD
description 碩士 === 國立交通大學 === 材料科學與工程系所 === 97 ===  This thesis contains three main topics: synthesis, self-assembling dispersions and the optical properties of various metallic nanoparticles. Firstly, we have successfully synthesized pure Ag, Au, and Cu nanoparticles as well as core-shelled Au/Ag, and Au/Cu nanoparticles by the polyol process. According to TEM analysis, the mean diameters of nanoparticles prepared were found to be smaller than 20 nm with a narrow size distribution. In the polyol process, PVP acts as a nucleation promoting agent for nanoparticles, a stabilizer for mono-dispersion, and a protective agent for oxidation. By varying the reaction temperature and PVP concentration, nanoparticles with different structures can be obtained for the further study.  Nanoparticles usually exhibit distinct structures as well as properties comparing with bulk materials. In order to distinguish these special structures, FCC, Decahedron and Icosahedrons, by nondestructive characterization of X-ray diffraction, a serious of theoretical X-ray diffraction patterns were calculated and compared with experimental data. The results clearly show that X-ray diffraction can effectively distinguish these structures and is in good agreement with the observation of HRTEM.  For the optical examinations, the nanoparticles prepared were dispersed onto the optical glass by two ways, i.e. typical spin-coating and block-copolymer self-assembling methods. For the prior method, the washed Ag, Au, Cu, Au/Ag and Au/Cu nanoparticles were dissolved in the ethylene-glycol, and then spun with low speed to obtain nanoparticle thin film with various film thicknesses. For the posterior method, PVP-coated Ag nanoparticles were added into the block copolymer PS-P2VP micellar solution, and then spun with high speed to prepare self-assembly Ag nanoparticle thin films. Following with annealing treatments, various periodic patterns of Ag nanoparticle thin films were obtained. The absorption spectra of nanoparticle solutions and the obtained nanoparticle thin films with various thicknesses were then characterized by UV-vis spectrum spectroscopy. In our research, we have successfully simulated the absorption spectra of Ag, Au, Cu, Au/Ag and Au/Cu nanoparticle solutions based on Mie theory. A dramatic change on the absorption spectra was found between aqueous solutions of nanoparticles and nanoparticle thin films. The peak position of the thin film is greatly red-shifted from the general position observed for the nanoparticles in the aqueous solution. With the thickness increases, red-shifts were initially enhanced and then to reach a saturated value.
author2 Chen, Chun-Hua
author_facet Chen, Chun-Hua
Chang, Chia-Lun
張嘉倫
author Chang, Chia-Lun
張嘉倫
spellingShingle Chang, Chia-Lun
張嘉倫
Au, Ag, Cu and their core-shell nanoparticles: synthesis, self-assembly and tunable optical properties.
author_sort Chang, Chia-Lun
title Au, Ag, Cu and their core-shell nanoparticles: synthesis, self-assembly and tunable optical properties.
title_short Au, Ag, Cu and their core-shell nanoparticles: synthesis, self-assembly and tunable optical properties.
title_full Au, Ag, Cu and their core-shell nanoparticles: synthesis, self-assembly and tunable optical properties.
title_fullStr Au, Ag, Cu and their core-shell nanoparticles: synthesis, self-assembly and tunable optical properties.
title_full_unstemmed Au, Ag, Cu and their core-shell nanoparticles: synthesis, self-assembly and tunable optical properties.
title_sort au, ag, cu and their core-shell nanoparticles: synthesis, self-assembly and tunable optical properties.
publishDate 2009
url http://ndltd.ncl.edu.tw/handle/07287895945268657498
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