title: Photocatalytic patterning and modification of graphene.
abstract: TiO(2)-based photocatalysis has been widely used to decompose various organic pollutants for the purpose of environmental protection. Such a "green" photochemical process can ultimately degrade organic compounds into CO(2) and H(2)O under ambient conditions. We demonstrate here its extended application on the engineering of single- or few-layer graphene. Using a patterned TiO(2) photomask, we have achieved various photochemical tailorings of graphene, including ribbon cutting, arbitrary patterning on any substrate, layer-by-layer thinning, and localized graphene to graphene oxide conversion. UV-visible spectroscopic studies indicate that the photogenerated, highly reactive ·OH radicals work as sharp chemical scissors. Being a solution-free, cost-effective, scalable, and easy handling technique, the presented photocatalytic patterning and modification approach allows for the versatile design and fabrication of graphene-based devices and circuits, compatible with current microelectronic technology, as demonstrated by this fabricated all-carbon field effect transistor (FET) array.
authors.affiliation: Centre for Nanochemistry, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry & Molecular Engineering, Peking University, Beijing, People's Republic of China.
authors.forename: Liming
authors.initials: L
authors.lastname: Zhang
authors.forename: Shuo
authors.initials: S
authors.lastname: Diao
authors.forename: Yufeng
authors.initials: Y
authors.lastname: Nie
authors.forename: Kai
authors.initials: K
authors.lastname: Yan
authors.forename: Nan
authors.initials: N
authors.lastname: Liu
authors.forename: Boya
authors.initials: B
authors.lastname: Dai
authors.forename: Qin
authors.initials: Q
authors.lastname: Xie
authors.forename: Alfonso
authors.initials: A
authors.lastname: Reina
authors.forename: Jing
authors.initials: J
authors.lastname: Kong
authors.forename: Zhongfan
authors.initials: Z
authors.lastname: Liu
mesh_terms: D002384:Catalysis; D006108:Graphite / Q000737:chemistry*; D010316:Particle Size; D010777:Photochemistry; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: C009495:titanium dioxide; D006108:Graphite; D014025:Titanium