Fig. 2

Spectroscopic and electrical characteristics of PFTPA-Fc. a UV-Visible absorption (red) and fluorescence (blue) spectra and b cyclic voltammetry plot of PFTPA-Fc. c Current–voltage of the ITO/polymer/Pt sandwich structures device constructing from different polymers of PFF6, PFTPA, PFF6-Fc, and PFTPA-Fc, respectively. d Fluorescence line scan image of the ITO/PFTPA-Fc/Pt device at different oxidation state, each composed of 122 spectra acquired along a 287 μm straight line