If graphene is used in microelectronics, chemical modification is required to introduce a band gap to achieve semiconducting behavior (Zhou et al.
#Epoxy xps peak c1s o1s full#
Ironically, despite its outstanding properties and bright prospects, several issues must be overcome before the full promise of graphene can be realized industrially. 2009), chemical and biological sensors (Schedin et al. 2008), new electronic devices (Novoselov et al. 2005 Fujita 2011), energy-storage material (Deng et al. 2006 Katsnelson and Novoselov 2007 Novoselov et al. Recently, graphene has shown potential applications in lots of fields, such as fundamental physical research (Barone et al. 2010 Geim and Novoselov 2007 Tanaka and Iakoubovskii 2010 Rao et al. Graphene, constituted by the two-dimensional honeycomb C–C network, has attracted a great deal of attention due to its exceptional and intriguing properties (Novoselov et al. The demonstrated strategy can overcome limitations of Hummers method, provide possibility to gain functionalization and wettability transition in liquid-phase exfoliated basal-defect- and oxide-free graphene in the dry environment, and may extend the study and application of this material in spacecraft in low earth orbit. This phenomenon is attributed to the lower surface roughness induced by collision and/or edge erosion of energetic ions to the film surface and is further explained by the Wenzel model. The contact angle increases with AO exposure time. The films turn to be hydrophilic after exposed to AO. It is found that AO induced functionalization of these films through the formation of epoxy groups, sp 3 configuration, ether, and double and triple C–O groups. These graphene-based films are neither graphene nor graphite, but graphene blocks constituted by numerous randomly stacked graphene flakes. Here, we demonstrate a high-vacuum oxidation strategy by atomic oxygen (AO) and investigate the AO induced functionalization and wettability transition in films made from basal-defect- and oxide-free graphene dispersions.
Though chemical modification of graphene based on Hummers method has been most widely used to tailor its properties and interfacial characteristics, a method which could achieve definitive and controllable groups and properties is still highly required.
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