41. (J. Colloid Interf. Sci.) )Photoreduction of graphene oxide with polyoxometalate clusters and its enhanced saturable absorption
writer：Haolong Li,* Jyotsana Gupta, Shan Wang, Na Zhang, Christoph Bubeck*
keywords：Graphene, Photoreduction
source：期刊
specific source：Journal of Colloid and Interface Science 2014, 427, 25-28.
Issue time：2014年
We investigated the photocatalytic abilities of three Keggin-type polyoxometalate (POM) clusters, H3PW12O40 (PW), H4SiW12O40 (SiW), and H3PMo12O40 (PMo) to reduce graphene oxide (GO) under UV-irradiation in water. UV–vis absorption and X-ray photoelectron spectroscopy were performed and show that PW and SiW can photoreduce GO effectively, in contrast to PMo. We conclude that the LUMO levels of POMs should be located energetically above the work function of GO to enable electron transfer from POM to GO. We also investigated the saturable absorption of GO and reduced GO by means of z-scan experiments at 532 nm. The POM-assisted photoreduction of GO can greatly enhance the saturable absorber properties of GO, which appears useful for modelocking in ultrafast laser systems.
http://www.sciencedirect.com/science/article/pii/S002197971301014X