新穎表面電漿光觸媒光碟片

Abstract

自從1969年「本多-藤島」效應被發現以來，光觸媒已運用在廢水處理、除臭、殺菌、氮化物分解、防污及氫能源的生產上。然而，光觸媒的轉換效率不佳且無法有效提升也限制了其更廣泛的運用於人類文明中。因此本研究設計了利用化學水熱法在光碟片塑膠基板上以低溫製成大面積氧化鋅奈米柱，並以經熱處理之不連續金作為輔助，進行甲基橙染料之光分解實驗。並利用電子顯微鏡、原子力顯微鏡、X光繞射儀以及紫外-可見光光譜來分析製作出的樣品。本實驗亦利用一特殊設計之旋轉盤反應器，提升分解物在光觸媒表面上的質量轉移效率。在染料之光分解的實驗結果顯示，在不連續之金膜上，奈米金結構於特定波長的光照射下，會產生表面電漿共振現象，進而使侷域性的電磁場增強，使得甲基橙降解反應效率之提升，顯示其光觸媒活性之增益。

Since the Honda-Fujishima effect discovered in 1969, the photocatalysis has been utilized in water treatment, deodorization, anti-bacteria, NOX decomposition, dirtiness prevention and production of hydrogen energy. However, low and hardly improved photocatalytic conversion efficiency limits its widely application in human civilization. Therefore, a large scale of ZnO nanorods are synthesized on a plastic optical disc substrate by hydrothermal method at low temperature. By discontinuous gold film supported, a methyl orange degradation experiment was conducted. SEM, AFM, XRD and UV/Vis spectroscopy were used to characterized the sample. A specially designed rotating disk reactor was developed to achieve high mass transfer rate and to increase the process efficiency. Localized suface plasmons were generated in the gold nanostructure on discontinuous gold film with specific light illumination. The experimental results show that by discontinuous gold film supported, the photocatalytic conversion rate does increase both with UV and UV/Vis light illumination. It shows that the LSP enhance the near electromagnetic field, and then increased the photocatalytic activities.