以層層自組裝法製備含二氧化鈦奈米顆粒與聚L-多巴的光催化多層膜

Photocatalytic Multilayer Films Based on TiO2 Nanoparticles and Poly(L-Dopa) Using Layer-by-Layer Self-Assembly

袁偉昌(Yuan Weichang)

指導教授 ： 吳劍侯

國立清華大學/原子科學院/生醫工程與環境科學系/碩士(2016年)

摘要

摘要
在溫和的反應條件和簡易的製備過程下，以玻璃為基材的層層自組裝二氧化鈦/L-多巴薄膜被成功製備，並且具有很好的透明度以及可控的粗糙度和厚度。此外，該薄膜也展現出了對染劑的有效降解。紫外可見分光光度計、場發射掃描式電子顯微鏡、傅里葉轉換紅外光譜和原子力顯微鏡被用於鑑定製備好的層層自組裝P25/聚L-多巴多層薄膜。鑑定結果顯示了薄膜厚度隨著層數增加呈現線性增長，表面結構具有起伏狀的孔洞性結構，奈米級別二氧化鈦清晰可見。該薄膜的光催化性質在紫外光(352 nm)下進行了測試，分別探討了每層浸泡的時間、鍍膜的層數和總的浸泡時間對光催化性質的影響。P25/聚L-多巴多層薄膜對磺酸羅丹明B (SRB)的光降解展現出與厚度的高度相關性和很好的重複利用性，通過銀離子溶液的浸泡可進一步增加其光催化效率。相同條件下，P25/聚L-多巴多層膜與P25/聚丙烯酸(PAA)多層膜具有近似光催化效率。此外，本文也探討了不同的二氧化鈦粒子（粒徑和表面電位）對層層自組裝薄膜製備和光催化性質的影響。

關鍵字

二氧化鈦 ； 層層自組裝 ； 薄膜 ； 光催化反應 ； 磺酸羅丹明B

並列摘要

Abstract
Layer-by-layer (LbL) self-assembly TiO2/Poly(L-Dopa) (PDopa) thin films on soda lime glass slides with good transparency, controlled roughness and thickness have been successfully prepared under mild conditions and simple process. The obtained LbL P25/PDopa multilayer thin films were characterized by UV-vis spectroscopy, field emission scanning electron microscopy (FESEM), fourier transform infrared spectroscopy (FT-IR) and atomic force microscopy (AFM). The characterization revealed the linear growth of nanoscale thickness, porous surface morphology and nanosized NPs. Photocatalytic activities were tested under UV (352 nm) irradiation. The effects of layer deposition time, number of bilayers and total deposition time were studied and compared. LbL P25/PDopa multilayer thin films demonstrated a thickness-dependent photocatalytic performance with excellent reusability towards the degradation of Sulforhodamine B (SRB). The photocatalytic performance can be further enhanced by simple treatment with Ag+. The LbL P25/PDopa multilayer thin films had similar photocatalytic performance with LbL P25/PAA multilayer thin films. The influence of using TiO2 NPs with different particle size and surface zeta potential has also been studied.

並列關鍵字

TiO2 ； layer-by-layer self-assembly ； thin film ； photocatalytic reaction ； sulforhodamine B

參考文獻

References

Ajmal, A.; Majeed, I.; Malik, R. N.; Idriss, H.; Nadeem, M. A. Principles and Mechanisms of Photocatalytic Dye Degradation on TiO2 Based Photocatalysts: a Comparative Overview. RSC Adv. 2014, 4, 37003–37026.

Ariga, K.; Hill, J. P.; Ji, Q. Layer-by-Layer Assembly as a Versatile Bottom-Up Nanofabrication Technique for Exploratory Research and Realistic Application. Phys. Chem. Chem. Phys. 2007, 9, 2319–2340.

Chen, X.; Mao, S. S. Titanium Dioxide Nanomaterials: Synthesis, Properties, Modifications, and Applications. Chem. Rev. 2007, 107, 2891−2959.

Chen, X.; Zhang, J.; Zhai, H.; Hu, Z. Determination of Levodopa by Capillary Zone Electrophoresis Using an Acidic Phosphate Buffer and Its Application in the Analysis of Beans. Food Chem. 2005, 92, 381–386.