2016-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/703865摘要：表面電漿光觸媒(plasmonic photocatalyst)是將數十至數百奈米大小之金屬覆載半導體光觸媒，使其在紫外光及可見光下皆能增加光觸媒活性。當UV光照射時，光觸媒生成電子-電洞對，電子會轉移到金屬顆粒，這是電子阱的效應，可降低電子-電洞對的再結合。另外當特定光波長照射金屬顆粒，會發生價帶電子群體振盪現像，稱為侷域表面電漿共振(Localized Surface Plasmon Resonance, LSPR)，因而產生局部高電磁場，可激發吸附分子內部化學鍵，因而促進光催化反應。表面電漿光觸媒，能同時吸收UV光和可見光能，大幅延伸太陽光能利用的範圍。本計畫將使用TiO2光觸媒覆載金，銀，銅和鋁製備不同的表面電漿光觸媒。進行有機染劑Rh B光催化降解實驗和光催化水分解產氫。預定分三年執行，第一年預計以銅、鋁等較低成本之金屬取代貴重金屬，探討不同金屬對表面電漿光觸媒之影響，並以Rh B濃度之降解作為光催化效應之指標。第二年將研究碳材產生之LSPR現像，選擇石墨烯因為其具備高導電性，將探討金屬/石墨烯/光觸媒相互作用在光催化之關係。第三年將研究光纖內照明蜂巢載體反應器使用電漿光觸媒，進行光催化水分解產氫，預期可充分利用太陽全光譜的光能。本計畫完成後，在LSPR現象於光觸媒具有學術貢獻。應用於太陽光能水分解產氫氣，能在再生能源產業有應用方面的貢獻。<br> Abstract: Plasmonic photocatalyst consists of nano-size metal particles supported on semiconductor photocatalyst so that photocatalytic activity can be enhanced by fully utilize UV and visible light. Under UV light irradiation, pairs of electron-hole are generated on photocatalyst. Photo-induced electrons would migrate to metal particle due to the effect of electron trap, thus, the recombination of electron-hole is decreased. In addition, the collective oscillations of the free conduction-band electrons on metal particles can be induced by the specific-wavelength light irradiation. This phenomenon is called localized surface plasmon resonance (LSPR). A high electric-magnetic field is then appeared near metal particles. The chemical bonds of adsorbed molecules would be stimulated so that the photocatalytic activity is likely promoted. In general, plasmonic photocatalyst can absorb UV and visible light energy thus can extend the utilization of full spectrum of solar energy. This proposal will prepare several plasmonic photocatalysts which are impregnated Au, Ag, Cu and Al on TiO2 photocatalyst. Their photoactivity will be tested by photodegradation of organic RhB. Furthermore, these plasmonic photocatalysts will be used for photocatalytic water splitting to generate H2. We expect that whole span of sunlight can be harvested by such plasmonic photocatalysts. The proposal is 3-year research work. In the first year, Cu and Al will be used to prepare plasmonic photocatalysts because their low cost compared with Au and Ag. The influence of different metals on LSPR will be explored. The enhancement of photoactivity will be evaluated by the photodegradation of RhB. In the second year, the LSPR will be studied on carbon material. Graphene is chosen as candidate due to its high conductivity. We will investigate the metal/graphene/photocatalyst, and their interaction on photocatalytic behavior. In the third year, the plasmonic photocatalysts will applied to an optical-fiber internal-illuminated photoreactor. The photocatalytic water splitting will be carried out to generate H2. Thus the wide spectrum of solar energy can be absorbed. This research is expected to clearly reveal the phenomenon of LSPR on photocatalysis. The outcome will have substantial contribution to the application of renewable energy in the sunlight harvest.表面電漿光觸媒侷域表面電漿共振光催化水分解太陽氫能光纖內照明蜂巢載體反應器plasmonic photocatalysislocalized surface plasmon resonancephotocatalytic water splittingsolar H2optical-fiber internal-illuminated photoreactor