▎ 摘　　要

In this work we present combined Kelvin probe force microscopy and Raman spectroscopy studies of supported and suspended structures formed out of chemical vapor deposition (CVD) grown graphene. Work function of both suspended and supported graphene was -4.81 +/- 0.06eV and -4.92 +/- 0.06eV respectively. By G and 2D modes correlation we showed, that CVD graphene was influenced by biaxial strain. Increased contact potential difference (CPD) on the suspended graphene in comparison with the areas of the supported graphene was the sign of increased strain (from 0.05% to similar to 0.12%) rather than decreased doping (p-doping decreased from similar to 5.5 x 10(12)cm(-2) to similar to 4.5 x 10(12)cm(-2)). (C) 2016 Elsevier B.V. All rights reserved.