太陽能是一個無汙染、便宜且能夠永續發展的乾淨能源，然而使用太陽能並非容易，如何使用太陽能變成關鍵的議題。儲存太陽能的方法有許多，其中將其轉換成氫能保存利用是其中一個已經被實際應用的方法。過去幾十年將太陽能轉換成氫能有幾個較常被使用的方法：太陽能電池電解水、生物產氫以及光觸媒...等。
其中，光觸媒產氫是利用半導體，電子電洞對分離的機制，進行氧化還原反應電解水產生氫氣，而過程中不會產生任何溫室氣體以及汙染物。然而目前光觸媒最大問題在於其吸收波段位於紫外光，並無法有效利用太陽光中比例較高的可見光。近年來，金屬照射可見光後發生表面電漿共振，產生熱電子，並將其傳至鄰近半導體的導帶，這樣的機制能增加其在可見光區水分解產氫的效能。
在此研究中，我們製作一製程容易且高效能的可見光光觸媒：鉑-二氧化鈦-金三層奈米指狀共振結構，此結構能夠吸收大部分的太陽能；藉由金的共振結構提供大量的熱電子，移動至二氧化鈦的導帶，再傳遞至鉑奈米顆粒，進行水分解反應產生氫氣，同時留在金表面的熱電洞則會與水進行氧化反應產生氧氣。
在電化學的量測中顯示在氫氣還原電位下，光電流提升了100%，間接表示了試片對於可見光水分解產氫的能力。

Sunlight is a non-polluting, inexpensive, and endlessly renewable source of clean energy, however, it can hardly be applied freely in demand. As a result, to store solar energy into another energy forms, such as hydrogen, is a more practical way for real applications. There were various methods developed in the past decade to transfer solar energy into hydrogen, including electrolysis of water using a solar cell, reforming of biomass, and photocatalytic. Among them, photocatalytic reactions based on electron-hole pair production in semiconductors can generate hydrogen without any CO2 or other pollution produced. However, most of light spectra employed were in UV region, posing low efficiency on the utilization of the whole sun-light energy. Recently, it was reported that hot electrons transferred from plasmonic structure to neighboring photocatalyst could enhance the photo response for solar water splitting, especially in visible light region. we propose a simple yet high efficient plasmonic structure incorporated with Pt-TiO2-Au sandwich nano fingers to provide numerous hot spot regions for harvesting photons over entire solar spectrum. The hot electrons generated from the surface plasmons in the gold nanocorrugation structures can be transferred via neighboring titanium dioxide into the platinum nanoparticles, thus help on generating hydrogen in higher efficiency.
Experimental results demonstrated the photoelectrochemical signal can be enhanced by 100% in on-off test under visible light with hydrogen reduction potential, indicating the possibility for high efficient hydrogen generation.

圖目錄 vii
表目錄 xi
第1章 緒論 1
1-1 前言 1
1-2 光觸媒簡介 3
1-2-1 本多-藤嵨效應（Honda-Fujishima effect） 3
1-2-2 光觸媒材料特性 4
1-2-3 光催化水分解原理 5
1-2-4 助催化劑 6
1-2-5 犧牲試劑原理 7
1-3 二氧化鈦光觸媒特性與製備 8
1-4 光化反應的增強 10
1-4-1 單一能隙的光化反應增強 10
1-4-2 不同能隙間的電子傳遞 11
1-4-3 表面電漿共振應用於光化反應 13
第2章 文獻回顧 17
2-1 表面電漿共振結構 17
2-2 自組裝奈米聚苯乙烯球陣列 21
2-2-1 液膜蒸發法 21
2-2-2 旋佈法 21
2-2-3 Langmuir-Blodgett 薄膜沉積法 21
2-2-4 液面沉積法 22
2-3 研究動機與目的 23
第3章 實驗方法 24
3-1 奈米結構的製備 24
3-1-1 藥品及設備本研究藥品及設備如表所示。 24
表 3 2　製程設備資料 24
3-1-2 結構製備步驟 24
3-1-3 結構代號 27
3-2 結構鑑定與分析 27
第4章 結果與討論 30
4-1 不同週期平滑聚苯乙烯球光譜之量測 30
4-2 參考平面SEM影像 30
4-3 結構SEM 31
4-4 結構與沉積材料之比較 36
4-4-1 UV/vis光譜 36
4-4-2 循環伏安法量測 38
4-4-3 0V（v.s. SCE）下電流對時間之比較 42
4-4-4 0V（v.s. SＨE）下電流對時間之比較 46
4-4-5 不同波長光源照射對結構之影響 52
第5章 結論與未來工作 53
5-1 結論 53
5-2 未來工作 54
5-2-1 實際產氫量量測 54
5-2-2 增加LSPR強度 55
5-2-3 加強材料之間的連結性 55

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