Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong, Yuseong, Daejeon 305-701, Republic of Korea.
Nanotechnology. 2010 Jan 8;21(1):015703. doi: 10.1088/0957-4484/21/1/015703. Epub 2009 Nov 30.
We present the synthesis and visible-light-induced catalytic activity of Ag(2)S-coupled TiO(2) nanoparticles (NPs) and TiO(2) nanowires (NWs). Through a simple wet chemical process from a mixture of peroxo titanic acid (PTA) solution, thiourea and AgAc, a composite of Ag(2)S NPs and TiO(2) NPs with sizes of less than 7 nm was formed. When the NP composite was further treated with NaOH solution followed by annealing at ambient conditions, a new nanocomposite material comprising Ag(2)S NPs on TiO(2) NWs was created. Due to the coupling with such a low bandgap material as Ag(2)S, the TiO(2) nanocomposites could have a visible-light absorption capability much higher than that of pure TiO(2). As a result, the synthesized Ag(2)S/TiO(2) nanocomposites exhibited much higher catalytic efficiency for the decomposition of methyl orange than commercial TiO(2) (Degussa P25, Germany) under visible light.
我们提出了 Ag(2)S 耦合 TiO(2)纳米粒子 (NPs) 和 TiO(2)纳米线 (NWs) 的合成及可见光催化活性。通过混合过氧钛酸 (PTA) 溶液、硫脲和 AgAc 的简单湿化学过程，形成了尺寸小于 7nm 的 Ag(2)S NPs 和 TiO(2) NPs 的复合材料。当 NP 复合材料进一步用 NaOH 溶液处理并在环境条件下退火时，形成了一种新的纳米复合材料，其中包含 TiO(2)NWs 上的 Ag(2)S NPs。由于与 Ag(2)S 等带隙较低的材料耦合，TiO(2)纳米复合材料在可见光下的吸收能力比纯 TiO(2)高得多。因此，与德国的商业 TiO(2（Degussa P25）相比，合成的 Ag(2)S/TiO(2)纳米复合材料在可见光下对甲基橙的分解表现出更高的催化效率。
