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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。
SnO_2 nanowires were prepared by chemical vapor deposition (CVD) through a solid-liquid-vapor (VLS) growth mechanism. A series of SnO_2 @ TiO_2 core-shell nanowires were deposited on the surface of SnO_2 nanowires by atomic layer deposition (ALD) using tetraisopropyl titanate as precursor. Through the middle Al 2 O 3 intercalation, two kinds of TiO 2 with different crystal types of rutile and anatase were prepared, respectively. Two types of SnO 2 @ TiO 2 core-shell nanowires with different composite structures were prepared. The effects of the thickness of TiO_2 and the crystal form on the photocatalytic degradation of methyl orange solution under ultraviolet light were investigated experimentally.