Optical Band Gap Alteration of Graphene Oxide via Ozone Treatment.

ABSTRACT: Graphene oxide (GO) is a graphene derivative that emits fluorescence, which makes GO an attractive material for optoelectronics and biotechnology. In this work, we utilize ozone treatment to controllably tune the band gap of GO, which can significantly enhance its applications. Ozone treatment in aqueous GO suspensions yields the addition/rearrangement of oxygen-containing functional groups suggested by the increase in vibrational transitions of C-O and C=O moieties. Concomitantly it leads to an initial increase in GO fluorescence intensity and significant (100 nm) blue shifts in emission maxima. Based on the model of GO fluorescence originating from sp² graphitic islands confined by oxygenated addends, we propose that ozone-induced functionalization decreases the size of graphi

SUBMITTER: Hasan MT 

PROVIDER: S-EPMC5527010 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature