Fig. 8From: Early-stage cervical cancer diagnosis based on an ultra-sensitive electrochemical DNA nanobiosensor for HPV-18 detection in real samplesFESEM image of (a) bare SPCE (scale 1000 nm), (b) modified SPCE with rGO-MWCNTs/AuNPs (scale 200 nm) and (c) modified SPCE with rGO-MWCNTs/AuNPs-l-cysteine (scale 500 nm)Back to article page