nature materials SUPPLEMENTARY INFORMATION DOl10.1038/NMAT2858 Unusual infrared-absorption mechanism in thermally reduced graphene oxide M.Acik',G.Lee',C.Mattevi2,M.Chhowalla2',K.Cho'and Y.J.Chabal* Department of Materials Science and Engineering,University of Texas at Dallas,Richardson, TX75080 2Rutgers University,Materials Science and Engineering,Piscataway,NJ,USA 08854 'Present address:Department of Materials,Imperial College,London,UK SW7 2AZ *Authors to whom correspondence should be addressed to: chabal@utdallas.edu NATURE MATERIALS www.nature.com/naturematerials 1SUPPLEMENTARY INFORMATION doi: 10.1038/nmat2858 nature materials | www.nature.com/naturematerials 1 1 SUPPLEMENTARY INFORMATION Novel infrared absorption mechanism in thermally reduced graphene oxide M. Acik1 , G. Lee1 , C. Mattevi2† , M. Chhowalla2 †, K. Cho1 and Y. J. Chabal1* 1 Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, TX 75080 2 Rutgers University, Materials Science and Engineering, Piscataway, NJ, USA 08854 Ɨ Present address: Department of Materials, Imperial College, London, UK SW7 2AZ *Authors to whom correspondence should be addressed to: chabal@utdallas.edu Unusual infrared-absorption mechanism in thermally reduced graphene oxide