表面電漿共振效應在金修飾錫酸鋅奈米結構之光觸媒特性提升研究

Surface Plasmon Resonance Effect For The Enhancement Of Photodegradation Activity Of Au/ZnSn(OH)6 Nanostructure

陳昱農(Chen, Yu Nong)

指導教授 ： 吳志明

國立清華大學/工學院/材料科學工程學系/碩士(2015年)

https://doi.org/10.6843/NTHU.2015.00221

摘要

本論文利用簡易之化學浴法合成錫酸鋅奈米顆粒，不需使用昂貴儀器，並可在短時間內合成大量粉末。為了改善光觸媒效果，本實驗利用沉澱附著法將金奈米顆粒裝飾於錫酸鋅表面，形成異質結構的金/錫酸鋅奈米結構。在紫外光照射下能夠增加光觸媒的效果，並利用金在奈米尺度下所產生的表面電漿共振效應吸收可見光波段，以達到可見光光觸媒的效果。
實驗使用醋酸鋅與錫酸鈉作為成長錫酸鋅之前驅物，去離子水及乙二醇為溶劑，於室溫下合成。經過20 分鐘的紫外光照射，錫酸鋅的降解率能夠達到100%，經過五次的循環測試後，降解能力依然存在，並沒有太多的損失，如此證明了錫酸鋅擁有高度的穩定性。此外，金/錫酸鋅利用了金的表面電漿共振效應，在可見光照射120 分鐘後，也能將10ppm 的羅丹名B 染料完全降解。如此高的降解能力是來自於錫酸鋅奈米顆粒結構中的氫氧根，氫氧根能夠增加反應速率，並且產生氫氧根自由基將羅丹名B 染料分解。

關鍵字

光觸媒 ； 錫酸鋅 ； 異質結構 ； 表面電漿共振

並列摘要

In this study, ZnSn(OH)6 nanocubes were synthesized by chemical bath method, which is low cost process and suited for mass production. In order to improve
photocatalytic activity, gold nanoparticles were grown on the surface of the ZnSn(OH)6 nanocubes by deposition-precipitation method to obtain Au/ZnSn(OH)6 heterojunction nanocubes. Subsequently, the Au/ZnSn(OH)6 nanocubes, photocatalytic activity was enhanced by surface plasmon resonance (SPR) effect under ultraviolet (UV) and visible-light irradiation.
Zinc acetate and sodium stannate source materials were acted as a solute solutions while deionized water and ethylene glycol were used as solvent to prepare ZnSn(OH)6 nanocubes at room temperature. The photodegradation ratio can be reached 100% within 20 min under ultraviolet-light illumination using ZnSn(OH)6 nanocubes. The ZnSn(OH)6 nanocubes achieved about five times cycling test without
an observable loss of photocatalytic activity, which indicated the high stability in the reaction medium. Moreover, the Rhodamine B (RhB) aqueous solution (10 ppm) was fully decomposed in 120 minutes by the Au/ZnSn(OH)6 nanocubes because of SPR effect. The highly photocatalytic activity of the Au/ZnSn(OH)6 and the ZnSn(OH)6 nanocubes is attributed to the hydroxyl groups, which enhance the reaction rate and enable the hydroxyl radicals to participate in the reaction for destruction of the RhB solution.

並列關鍵字

photocatalyst ； zinc stannate ； heterostructure ； surface plasmon resonance

參考文獻

[32] K.-C. Lee, S.-J. Lin, C.-H. Lin, C.-S. Tsai, Y.-J. Lu, Size effect of Ag nanoparticles on

[39] X.S. Nguyen, C.B. Tay, E.A. Fitzgerald, S.J. Chua, ZnO Coaxial Nanorod Homojunction UV

[22] L. Han, J. Liu, Z. Wang, K. Zhang, H. Luo, B. Xu, X. Zou, X. Zheng, B. Ye, X. Yu,

[13] A. Datta, D. Mukherjee, C. Kons, S. Witanachchi, P. Mukherjee, Evidence of Superior

[43] X. Wang, H. Zhu, Y. Xu, H. Wang, Y. Tao, S. Hark, X. Xiao, Q. Li, Aligned ZnO/CdTe Core−Shell