Fig. 3From: A graphitic nano-onion/molybdenum disulfide nanosheet composite as a platform for HPV-associated cancer-detecting DNA biosensorsDeconvoluted XPS a Mo 3d spectra and b S 2p spectra for the MoS2 nanosheets and nano-onion/MoS2 nanosheet composites with ratios from 1:1 to 1:8Back to article page