Fig. 9From: Early-stage cervical cancer diagnosis based on an ultra-sensitive electrochemical DNA nanobiosensor for HPV-18 detection in real samplesNyquist plots and equivalent circuit models of the impedance spectra recorded for SPCE modified with (a) rGO-MWCNTs, (b) rGO-MWCNTs/AuNPs, (c) rGO-MWCNTs/AuNPs-l-cysteine-ssDNA probe and (d) rGO-MWCNTs/AuNPs-l-cysteine-ssDNA probe with DNA targetBack to article page