Selective growth of TiO2 beads on Ag nanowires and their photocatalytic performance
Selective growth of TiO2 beads on Ag nanowires and their photocatalytic performance
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Ag纳米线上TiO2珠的选择性生长及其光催化性能
DOI：
10.1039/c5ce00705d
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发表时间：
2015-01-01
期刊：
影响因子：
3.1
通讯作者：
Yang, Ping
中科院分区：
文献类型：
--
作者：
Jia, Changchao;Chen, Hsueh-Shih;Yang, Ping
本文首次在Ag纳米线上沉积TiO 2颗粒，制备出项链状Ag纳米线@TiO2（Ag NW@TiO2）异质结构。它们是通过两步合成方法制备的，包括制备均匀的Ag纳米线和在Ag表面上沉积TiO 2。巯基乙酸（TGA）分子被用作粘合剂，以解决棘手的问题，大量的银NW核和二氧化钛壳之间的晶格失配。水的量和溶剂的介电常数被发现是形成项链状异质结构的重要因素。此外，通过改变丁醇钛（TBT）的量，可以可行地改变TiO 2珠粒的直径。以橙子（MO）为目标物，研究了项链状Ag NW @ TiO 2的光催化降解性能。结果表明，TiO 2与Ag的摩尔比对光催化活性有协同作用，当Ti/Ag比为2.8时，Ag NW@TiO2异质结构的光催化性能最好.
In this paper, TiO2 beads were deposited on Ag nanowires to create necklace-like Ag nanowire@TiO2 (Ag NW@TiO2) heterostructures for the first time. They were fabricated via a two-step synthetic method, including the preparation of uniform Ag NWs and the deposition of TiO2 on the Ag surface. Thioglycolic acid (TGA) molecules were used as binding agents to solve the tricky issue of substantial lattice mismatch between the Ag NW core and the TiO2 shell. The amount of water and the permittivity of the solvents are found to be important factors for the formation of the necklace-like heterostructures. Moreover, by varying the amount of titanium butoxide (TBT), the diameter of the TiO2 beads can be feasibly changed. The photocatalytic performance of necklace-like Ag NW@TiO2 was evaluated via degradation of methyl orange (MO) under ultraviolet (UV) light. The results reveal that the molar ratio of TiO2 to Ag contributes to the synergistic effect on the photocatalytic activity, and the best Ti/Ag ratio is found to be 2.8 for the highest photocatalytic performance of the Ag NW@TiO2 heterostructures.