Fig. 2From: Graphene oxide as a protein matrix: influence on protein biophysical propertiesX-ray photoelectron spectroscopy binding energy survey (a) and high resolution spectra of N 1s1/2 (b) and S 2p1/2 (c) binding energy region for GO, sulfo-NHS-GO, BOD, BOD-GO-A, and BOD-GO-C. All spectra were background corrected and vertically displaced for ease of visualizationBack to article page