Comparative Photocatalytic Ability of Nanocrystal-Carbon Nanotube and -TiO2 Nanocrystal Hybrid Nanostructures

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• 作者：Kyung Hwan Ji ; Dong Myung Jang ; Yong Jae Cho ; Yoon Myung ; Han Sung Kim ; Yunhee Kim ; Jeunghee Park
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：November 19, 2009
• 年：2009
• 卷：113
• 期：46
• 页码：19966-19972
• 全文大小：409K
• 年卷期：v.113,no.46(November 19, 2009)
• ISSN：1932-7455

文摘

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 CdS 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.