氧化鋅奈米粒子／奈米銀線之異質結構光觸媒材料光催化反應研究

環境保護漸漸地成為社關注的議題，而光觸媒材料也因此熱議，本研究是以氧化鋅作為光觸媒材料，並且複合奈米銀線，以甲基藍為有機環境汙染物指標，來探討本篇光觸媒材料之光催化效率。本篇以典型溶膠-凝膠法方式將醋酸鋅作為前驅物合成氧化鋅奈米粒子，有別於其他文獻，本篇採用超音波震盪之環境合成氧化鋅，此方式可有效避免粒子聚集、並且容易使氧化鋅奈米粒子生成。首先探討不同 polyvinyl pyrrolidone （PVP）分子量（mole weight）對於合成氧化鋅奈米粒子之大小及氧空缺的差異性，接著討論氧化鋅其中氧空缺之生成是否對於光催化反應有所影響。由於氧化鋅為寬的直接型能帶，故激發光源為紫外光，但由於紫外光耗能且對於人體有害，因應時下低耗能之需求，故此本篇將氧化鋅與奈米銀線複合，由於奈米銀線與氧化鋅物複合過後產生表面電漿共振之緣故，使得該觸媒材料激發光源不僅止於紫外光甚至包含可見光波段，且因為兩者材料複合過後造成能帶彎曲的現象因此形成蕭基接面，也因此提升氧化鋅之光觸效率。

關鍵字

氧化鋅奈米粒子；奈米銀線；光觸媒；光催化；光降解

並列摘要

Zinc oxide (ZnO) is one of the most popular semiconductor materials in recent years. In this study, we synthesized zinc oxide nano-particles (ZnO NPs) by the typical sol-gel method with ultrasonic treatment to avoid particle aggregation In the first part of this thesis, we discussed how the molecular weights (NW) of polyvinyl pyrrolidone (PVP), which was used as a protecting agent in the synthesis, affect the ZnO NPs size and the oxygen vacancies in ZnO structure. We characterized the ZnO NPs by scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible spectroscopy (UV-vis), photoluminescence (PL), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), Raman spectroscopy, etc. Next, we chose PVP MW ~ 8K to synthesize the optimized ZnO NPs. Then we combined ZnO NPs and silver nano-wires (Ag NWs) into heterostructured nano-composites with a UV light treatment. In this step, we also characterized the samples by TEM, SEM, PL, UV-vis, EDS, XRD, etc. The last as well as main purpose of this thesis is to study the photo-catalysis reaction with our ZnO / Ag nano-composites. The degradation of the organic pollutant methyl blue (MB) was used to evaluate the photo-catalytic efficiency. We compared the photo-catalytic efficiency of the pure ZnO samples synthesized by different PVP molar weights and the ZnO/Ag nano-composites.

並列關鍵字

Zinc oxide nano particle ； silver nano wire ； Photocatlytic

參考文獻

[1] Fujishima Akira and Honda Kenichi, "Electrochemical Photolysis of Water at a Electrode," Nature, vol. 63, p. 37, 1976.

[2] Hashimoto Kazuhito, Irie Hiroshi, and Fujishima Akira, "TiO2 Photocatalysis: A Historical Overview and Future Prospects," Japanese Journal of Applied Physics, vol. 44, p. 8269, 2005.

[3] 蔡明月 and 古玉詩, "光觸媒文獻之書目計量學研究," 教育資料與圖書館學, vol. 43, p. 153, 2005.

[5] R. P. Feynman, "There is plenty of room at the bottom," http://www.zyvex.com/nanotech/feynman.html.

[14] 彭賢越, "氧化鋅奈米柱成長於可饒性基板之複合壓電材料研究," 中原大學碩士論文, 2014.

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氧化鋅奈米粒子／奈米銀線之異質結構光觸媒材料光催化反應研究

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