Comparative Photocatalytic Ability of Nanocrystal-Carbon Nanotube and -TiO2 Nanocrystal Hybrid Nanostructures
Comparative Photocatalytic Ability of Nanocrystal-Carbon Nanotube and -TiO2 Nanocrystal Hybrid Nanostructures
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DOI：
10.1021/jp906476m
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发表时间：
2009-11-19
影响因子：
3.7
通讯作者：
Park, Jeunghee
中科院分区：
文献类型：
--
作者：
Ji, Kyung Hwan;Jang, Dong Myung;Park, Jeunghee
采用溶剂热法合成了不同纳米晶(如硫化镉、硫化镉和硫化铜)-碳纳米管(NC-CNT)和纳米二氧化钛杂化纳米结构，并比较了它们对可见光驱动降解亚甲基蓝(MB)染料的光催化能力。游离的US NCS的降解效率高于CdSe和Cu2S NCS。纳米碳管的光催化能力决定了其碳纳米管/二氧化钛杂化纳米结构的相对降解效率。这些结果表明，氧化N-脱甲基化降解涉及从NCS到MB的空穴转移。纳米碳管与二氧化钛纳米碳管和碳纳米管的杂化在一定程度上提高了氧化降解速率，这表明从纳米碳管到附着的碳纳米管(或二氧化钛)的界面电子转移过程延缓了电子和空穴的复合，对于这两种杂化纳米结构来说，这一过程是相似的。
We synthesized various nanocrystal (e.g., CdS, CdSe, and Cu2S)-carbon nanotube (NC-CNT) and NC-TiO2 hybrid nanostructures using the solvothermal method and compared their photocatalytic ability toward the visible-light-driven degradation of methylene blue (MB) dye. The free US NCs exhibited higher degradation efficiency than the CdSe and Cu2S NCs. The photocatalytic abilities of the NCs were found to determine the relative degradation efficiency of their CNT and TiO2 hybrid nanostructures. These results suggest that the oxidative N-demethylation degradation involves the transfer of holes from the NCs to MB. The hybridization of the NCs with the TiO2 NCs and CNTs enhances the oxidative degradation rate to the same extent, suggesting that the interfacial electron transfer process from the NCs to the attached CNTs (or TiO2), which retards the recombination of the electrons and holes, is comparable for both hybrid nanostructures.