Synthesis of Visible-Light Responsive Graphene Oxide/TiO2 Composites with p/n Heterojunction

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• 作者：Chao Chen ; Weimin Cai ; Mingce Long ; Baoxue Zhou ; Yahui Wu ; Deyong Wu ; Yujie Feng
• 刊名：ACS Nano
• 出版年：2010
• 出版时间：November 23, 2010
• 年：2010
• 卷：4
• 期：11
• 页码：6425-6432
• 全文大小：2016K
• 年卷期：0
• ISSN：1936-086X

文摘

Graphene oxide/TiO₂ composites were prepared by using TiCl₃ and graphene oxide as reactants. The concentration of graphene oxide in starting solution played an important role in photoelectronic and photocatalytic performance of graphene oxide/TiO₂ composites. Either a p-type or n-type semiconductor was formed by graphene oxide in graphene oxide/TiO₂ composites. These semiconductors could be excited by visible light with wavelengths longer than 510 nm and acted as sensitizer in graphene oxide/TiO₂ composites. Visible-light driven photocatalytic performance of graphene oxide/TiO₂ composites in degradation of methyl orange was also studied. Crystalline quality and chemical states of carbon elements from graphene oxide in graphene oxide/TiO₂ composites depended on the concentration of graphene oxide in the starting solution. This study shows a possible way to fabricate graphene oxide/semiconductor composites with different properties by using a tunable semiconductor conductivity type of graphene oxide.