SnO_2@TiO_2核-壳纳米线的制备及其光催化性能

Preparation and Photocatalytic Performance of SnO_2@TiO_2 Core-shell Nanowires

通过固-液-气(VLS)生长机制,利用化学气相沉积法(CVD)制备SnO_2纳米线。利用原子层沉积(ALD)以钛酸四异丙酯为前驱体在SnO_2纳米线表面沉积不同厚度的TiO_2壳层,形成SnO_2@TiO_2核-壳纳米线结构。通过中间Al_2O_3插层,分别制备出金红石和锐钛矿2种不同晶型的TiO_2,从而制备出2种不同复合结构的SnO_2@TiO_2核-壳纳米线。实验研究该复合结构中TiO_2的厚度与晶型对紫外光下光催化降解甲基橙溶液活性的影响。

To improve the photocatalytic activities of TiO_2, SnO_2@TiO_2 core-shell structure was synthesized. SnO_2 nanowires were prepared by chemical vapor deposition（CVD） based on the VLS growth mechanism, and then TiO_2 was deposited on the surface of SnO_2 nanowires by Atomic Layer Deposition（ALD） using tetraisopropyl titanate as the metal precursor. The results show that titanium dioxide possesses the rutile structure in SnO_2@TiO_2 core-shell structure and the anatase structure appears through the effect of the intercalation of Al_2O_3. To examine the photocatalytic activity for degradation of methyl orange solution under ultraviolet light, the thickness and crystal structure of TiO_2 in the core-shell structure were studied.