Multilayer Hybrid Films Consisting of Alternating Graphene and Titania Nanosheets with Ultrafast Electron Transfer and Photoconversion Properties
Multilayer Hybrid Films Consisting of Alternating Graphene and Titania Nanosheets with Ultrafast Electron Transfer and Photoconversion Properties
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DOI：
10.1002/adfm.200900891
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发表时间：
2009-11-23
影响因子：
19
通讯作者：
Loh, Kian Ping
中科院分区：
文献类型：
--
作者：
Manga, Kiran Kumar;Zhou, Yong;Loh, Kian Ping
交替的石墨烯（G）和二氧化钛（Ti0.91O2）多层纳米片制造使用逐层静电沉积，然后通过紫外线照射。通过紫外-可见吸收光谱和X射线衍射证实了氧化石墨烯（CO）和二氧化钛纳米片以聚乙烯亚胺为连接剂的顺序成功组装。在UV照射下可以实现GO到G的光催化还原。超快光催化电子转移之间的二氧化钛和石墨烯证明使用飞秒瞬态吸收光谱。在界面处的有效激子解离与跨表面电荷渗透耦合使得多层Ti0.91O2/G膜中的光电流转换有效
Alternating graphene (G) and titania (Ti0.91O2) multilayered nanosheets are fabricated using layer-by-layer electrostatic deposition followed by UV irradiation. Successful assemblies of graphene oxide (CO) and titania nanosheets in sequence with polyethylenimine as a linker is confirmed by UV-vis absorption and X-ray diffraction. Photocatalytic reduction of GO into G can be achieved upon UV irradiation. Ultrafast photocatalytic electron transfer between the titania and graphene is demonstrated using fermtosecond transient absorption spectroscopy. Efficient exciton dissociation at the interfaces coupled with cross-surface charge percolation allows efficient photocurrent conversion in the multilayered Ti0.91O2/G films