Williams Graeme, Seger Brian, Kamat Prashant V
Radiation Laboratory, Department of Chemistry & Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-0579, USA.
ACS Nano. 2008 Jul;2(7):1487-91. doi: 10.1021/nn800251f.
Graphene oxide suspended in ethanol undergoes reduction as it accepts electrons from UV-irradiated TiO(2) suspensions. The reduction is accompanied by changes in the absorption of the graphene oxide, as the color of the suspension shifts from brown to black. The direct interaction between TiO(2) particles and graphene sheets hinders the collapse of exfoliated sheets of graphene. Solid films cast on a borosilicate glass gap separated by gold-sputtered terminations show an order of magnitude decrease in lateral resistance following reduction with the TiO(2) photocatalyst. The photocatalytic methodology not only provides an on-demand UV-assisted reduction technique but also opens up new ways to obtain photoactive graphene-semiconductor composites.
悬浮在乙醇中的氧化石墨烯在从紫外线照射的二氧化钛悬浮液中接受电子时会发生还原反应。随着悬浮液颜色从棕色变为黑色，这种还原反应伴随着氧化石墨烯吸收情况的变化。二氧化钛颗粒与石墨烯片层之间的直接相互作用阻碍了石墨烯剥落片层的塌陷。在由金溅射终端隔开的硼硅酸盐玻璃间隙上浇铸的固体薄膜，在用二氧化钛光催化剂还原后，横向电阻降低了一个数量级。这种光催化方法不仅提供了一种按需紫外线辅助还原技术，还开辟了获得光活性石墨烯 - 半导体复合材料的新途径。
