Fig. 1From: A graphitic nano-onion/molybdenum disulfide nanosheet composite as a platform for HPV-associated cancer-detecting DNA biosensorsa UV–vis absorbance spectra and b FT-IR spectra of nano-onions, MoS2 nanosheets, and nano-onion/MoS2 nanosheet composites with ratios from 1:1 to 1:8. NO, nano-onion; COCl, acyl; NH2, amine; COOH, carboxylBack to article page