TiO_(2) Nanocrystals Grown on Graphene as Advanced Photocatalytic Hybrid Materials

查看全文 作　　者：Yongye [1]Liang;Hailiang [1]Wang;Hernan Sanchez [1]Casalongue;Zhuo [1]Chen;Hongjie [1]Dai

机构地区：[1]Department of Chemistry and Laboratory for Advanced Materials,Stanford University,Stanford,CA 94305,USA

出　　处：《Nano Research》索引2010年第3卷第10期,共5页

基　　金：This work was supported in part by Intel,MARCO-MSD,and ONR. 摘　　要：A graphene/TiO_(2) nanocrystals hybrid has been successfully prepared by directly growing TiO_(2) nanocrystals on graphene oxide(GO)sheets.The direct growth of the nanocrystals on GO sheets was achieved by a two-step method,in which TiO_(2) was first coated on GO sheets by hydrolysis and crystallized into anatase nanocrystals by hydrothermal treatment in the second step.Slow hydrolysis induced by the use of EtOH/H2O mixed solvent and addition of H2SO4 facilitates the selective growth of TiO_(2) on GO and suppresses growth of free TiO_(2) in solution.The method offers easy access to the GO/TiO_(2) nanocrystals hybrid with a uniform coating and strong interactions between TiO_(2) and the underlying GO sheets.The strong coupling gives advanced hybrid materials with various applications including photocatalysis.The prepared graphene/TiO_(2) nanocrystals hybrid has superior photocatalytic activity to other TiO_(2) materials in the degradation of rhodamine B,showing an impressive three-fold photocatalytic enhancement over P25.It is expected that the hybrid material could also be promising for various other applications including lithium ion batteries,where strong electrical coupling to TiO_(2) nanoparticles is essential. 关键词：GRAPHENE titanium oxide PHOTOCATALYST HYDROLYSIS

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TiO_(2) Nanocrystals Grown on Graphene as Advanced Photocatalytic Hybrid Materials

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