Selective surface functionalization at regions of high local curvature in graphene

Qingzhi Wu; Yaping Wu; Yufeng Hao; Jianxin Geng; Matthew Charlton; Shanshan Chen; Yujie Ren; Hengxing Ji; Huifeng Li; Danil W. Boukhvalov; Richard D. Piner; Christopher W. Bielawski; Rodney S. Ruoff

doi:10.1039/C2CC36747E

Selective surface functionalization at regions of high local curvature in graphene†

Qingzhi Wu,^ab Yaping Wu,^b Yufeng Hao,^b Jianxin Geng,^c Matthew Charlton,^b Shanshan Chen,^b Yujie Ren,^b Hengxing Ji,^b Huifeng Li,^b Danil W. Boukhvalov,^d Richard D. Piner,^b Christopher W. Bielawski*^ce and Rodney S. Ruoff*^b

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* Corresponding authors

^a State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, and Biomedical Materials and Engineering Center, Wuhan University of Technology, Wuhan 430070, China

^b Department of Mechanical Engineering and the Materials Science and Engineering Program, The University of Texas at Austin, 1 University Station C2200, Austin, TX, USA
E-mail: r.ruoff@mail.utexas.edu

^c Department of Chemistry and Biochemistry, The University of Texas at Austin, 1 University Station A1590, Austin, TX, USA
E-mail: bielawski@cm.utexas.edu

^d School of Computational Sciences, Korea Institute for Advanced Study, Seoul 130-722, Korea

^e World Class University (WCU) Program of Chemical Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Korea

Abstract

Monolayer graphene was deposited on a Si wafer substrate decorated with SiO₂ nanoparticles (NPs) and then exposed to aryl radicals that were generated in situ from their diazonium precursors. Using micro-Raman mapping, the aryl radicals were found to selectively react with the regions of graphene that covered the NPs. The enhanced chemical reactivity was attributed to the increased strain energy induced by the local mechanical deformation of the graphene.

Chemical Communications

Selective surface functionalization at regions of high local curvature in graphene†

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