奈米二氧化鈦光子晶體應用於抑制光觸媒效應之探討

Investigation of nano-TiO2 based photonic crystal Applied on photo-catalytic effects

戴維文(Wei-Wen Dai)

指導教授 ： 廖朝光

元智大學/工程學院/化學工程與材料科學學系/碩士(2007年)

https://doi.org/10.6838/YZU.2007.00130

摘要

本研究成功的利用溶膠凝膠法，製備出均一粒徑的二氧化鈦奈米球，並將其堆疊成光子晶體，分析製作出具阻隔紫外光穿透能力的光子晶體薄膜。均一粒徑的二氧化鈦粒子是以氨為觸媒之控制水解速率法進行實驗，再經由實驗設計法及類神經網路分析製備出。將所得之二氧化鈦奈米球分散於鹼性水溶液中，在控制溼度的密閉系統內以自然沉降法堆疊光子晶體，使粒子自行組裝成週期性排列之光子晶體，並將光子晶體當成光罩測試光觸媒分解染料之速率。在二氧化鈦奈米球合成方面的實驗分析結果顯示，在提高溫度、增加水濃度皆有助於降低粒徑及粒徑分佈範圍，藉由所求得的最佳合成配方參數，可成功製作出所需粒徑之均一二氧化鈦奈米球；在探討以不同粒徑二氧化鈦粒子堆疊出不同厚度之光子晶體下，以233nm的二氧化鈦粒子阻隔紫外光通過光子晶體進入染料層的效果為最佳，此外當光子晶體層越厚其阻隔效果亦越佳。

關鍵字

二氧化鈦奈米球；光子晶體；阻隔紫外光；觸媒控制水解速率；類神經網路；最佳化模擬

並列摘要

Titania photonic crystal films which can prevent photodegradation of dye/TiO2 samples were fabricated using a particle deposition of nano-TiO2 self-assembly method. Different particle sizes of monodispersed TiO2 particles were first prepared using a sol-gel method. The optimal recipes of the particle synthesis were determined using DOE (design of experiment) and artificial neural network (ANN) methods. The prepared sol-gel TiO2 particles were then deposited on glass substrates in a high relative humidity- controlled environment. Results show that the smaller particle sizes with uniformed distribution were produced in a higher temperature and high water concentration operating condition during the sol-gel processing. Furthermore, the Tio2 photonic crystal films which can protect the TiO2/dye from photodegradation verified by UV exposure tests. The thicker films fabricated using 233 nm particle size were demonstrated as the best device to inhibit the photocatalytic effect on the dye/TiO2 samples.

並列關鍵字

TiO2 particles；photonic crystal；photodegradation；sol-gel method；artificial neural network

參考文獻

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