Study of photocatalytic performance improvement of sputtering decorated visible light sensitized ternary oxides on TiO2

• Main Authors: Liu, Yen-Chen, 劉彥辰
• Other Authors: Liang, Yuan-Chang
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/4qxk8k

碩士 === 國立臺灣海洋大學 === 材料工程研究所 === 107 === In this study, TiO2-ZnFe2O4 (ZFO) core-shell nanorods with various ZFO crystallite thicknesses are synthesized through sputtering deposited ZFO thin films onto the surfaces of TiO2 nanorods. By coupling ZFO narrow bandgap oxide with TiO2, an enhanced photodegradation efficiency of methylene orange under irradiation was achieved. The structural analyses revealed that ZFO crystallites were fully covered the surfaces of the TiO2 nanorods. The sputtering deposited ZFO crystallites on the head region of the composite nanorods is markedly thicker than that covered on the lateral region of the composite nanorods. The coverage of ZFO crystallites on the TiO2 nanorods led to an improved light harvesting, a decrease in hole–electron recombination rate as well as the enhanced photodegradation activity of the TiO2-ZFO heterostructures under irradiation. The optimized ZFO thickness on the head region of the composite nanorods is approximately 43 nm in average and that at the lateral region of the composite nanorods is 15 nm exhibited superior photodegradation ability to methylene orange and retained a stable photodegradation efficiency of approximately 97% after cycling tests. The results herein demonstrated that sputtering deposition of ZFO crystallite with tunable thickness is a promising approach to design TiO2-ZFO composite nanorods with various ZFO coverage sizes and to adjust their photodegradation ability toward organic dyes.