| Summary: | 博士 === 國立清華大學 === 材料科學工程學系 === 102 === There are two major parts in this thesis, including Part I: the fabrications, materials characteristics and optoelectronic applications of nanostructures of core-shell SnO2-ZnO, tin-doped indium oxide, and Part II: the syntheses, materials features and optoelectronic applications of nanoparticles of core-shelled silica-silver and silver-embedded aluminum/silica.
In the Part I, as for core-shell SnO2-ZnO nanowires, in advance, tin dioxide nanowires were synthesized by thermal evaporation. Then, depositions of ZnO nanolayer on SnO2 nanowires have been successfully synthesized by atomic layer deposition (ALD). These results demonstrated that the SnO2-ZnO core-shell nanowires have potential application as UV photodetectors with high photon-sensing properties.
In terms of nanostructures of tin-doped indium oxide, indium oxide (In2O3) nanorods, nanotowers and tin-doped (Sn:In=1:100) indium oxide (ITO) nanorods have been successfully fabricated by thermal evaporation, respectively. Judging from cathodeluminescence (CL) spectra of these three nanoproducts, it is clear that tin-doped (Sn:In=1:100) indium oxide (ITO) nanorods cause a blue shift. No doubt that ITO nanorods obtains the most effective performance among these three nanoproducts, and this also means doping elements in original nanomaterials would be the best way to enhance physical properties. Additionally, this study would be beneficial to the applications of In2O3 nanorods, nanotowers and ITO nanorods in optoelectronic nanodevices, especially in organic light-emitting diode (OLED).
In the Part II, as for core-shelled silica-silver nanoparticles, abundant core-shelled silica-silver nanospheres with uniform diameter and morphology were successfully synthesized by Stöber and seed-mediated method, in sequence. Moreover, by the different additions of glucose as the reducing agent, the silver nanoparticles were deposited on silica spheres by redox reaction, and the dimensions of samples were well controlled. The surface plasmon resonance absorption band shifted toward infra-red region and became broader gradually during the dimensions of silver nanoparticles were increased in the growth range. Meanwhile, this intriguing result shows that two absorption characteristics peaks are observed in the spectra while the morphologies of nanoparticles are becoming oval-shaped. The amazing data imply that using core-shelled silica-silver nanospheres efficiently enhances the degradation of the organic pollutants under solar energy, which means the core-shelled silica-silver nanospheres is not only a cost-effective route but an energy-saving way to our planet.
In terms of silver-embedded aluminum/silica nanoparticles, in order to improve the time-consumption issue of the above method, substantial silver-embedded aluminum/silica nanospheres with uniform diameter and morphology were successfully synthesized by a modified sol-gel technique, a one-spot method. The chemical durable examinations and antibacterial tests of each sample were also carried out for the confirmation of usages in practical. As a result of above analyses, the silver-embedded aluminum/silica nanospheres are eligible for fabricating antibacterial utensils.
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