Zhou Yangen, Zhang Yongfan, Lin Mousheng, Long Jinlin, Zhang Zizhong, Lin Huaxiang, Wu Jeffrey C-S, Wang Xuxu
State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350002, China.
Department of Chemistry, Fuzhou University, Fuzhou 350108, China.
Nat Commun. 2015 Sep 11;6:8340. doi: 10.1038/ncomms9340.
Two-dimensional-layered heterojunctions have attracted extensive interest recently due to their exciting behaviours in electronic/optoelectronic devices as well as solar energy conversion systems. However, layered heterojunction materials, especially those made by stacking different monolayers together by strong chemical bonds rather than by weak van der Waal interactions, are still challenging to fabricate. Here the monolayer Bi2WO6 with a sandwich substructure of BiO-WO4-BiO is reported. This material may be characterized as a layered heterojunction with different monolayer oxides held together by chemical bonds. Coordinatively unsaturated Bi atoms are present as active sites on the surface. On irradiation, holes are generated directly on the active surface layer and electrons in the middle layer, which leads to the outstanding performances of the monolayer material in solar energy conversion. Our work provides a general bottom-up route for designing and preparing novel monolayer materials with ultrafast charge separation and active surface.
二维层状异质结由于其在电子/光电器件以及太阳能转换系统中令人兴奋的行为，近年来引起了广泛关注。然而，层状异质结材料，特别是那些通过强化学键而非弱范德华相互作用将不同单分子层堆叠在一起制成的材料，其制备仍然具有挑战性。本文报道了具有BiO-WO4-BiO夹心亚结构的单分子层Bi2WO6。这种材料可被表征为一种层状异质结，其中不同的单分子层氧化物通过化学键结合在一起。配位不饱和的Bi原子作为表面活性位点存在。在光照下，空穴直接在活性表面层产生，电子在中间层产生，这导致了该单分子层材料在太阳能转换方面的优异性能。我们的工作为设计和制备具有超快电荷分离和活性表面的新型单分子层材料提供了一种通用的自下而上的途径。
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