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(a) Scheme of the experimental setup for the conducting polymer nanojunction electrochemical transistor. Au1 and Au2 represent source and drain working electrodes. The gate potential referred to a Ag wire reference electrode (RE). CE is a Pt wire counter electrode. Aniline electropolymerization is carried out by cycling between and vs SCE (Ref. 18) at in PSS solution with and at . Scanning electron microscope image of poly(GGH-ANI) deposited on gold pads with nm gap also shown. (b) Peptide-modified aniline monomers employed in the polymer nanojunctions: GGH and aniline. (c) Typical curve of poly(GGH-ANI) nanojunction in free aniline solution ( ) at . The PANI redox states are indicated. (d) Reflection-absorption FTIR spectrum for poly(GGH-ANI) and regular PANI films on gold surfaces. For comparison, the spectra absorbance is normalized by the corresponding absorbance at which is assigned to non symmetric ring stretching of quinoid ring (imine groups of PANI units).
(a) Simultaneous monitoring of the time course of normalized on poly(GGH-ANI) and regular PANI nanojunctions at upon the injection of solutions using an amplifier circuit. Initial solution: de-ionized water. Numbers indicate final concentrations. (b) Calibration plot corresponding to (a) showing the change in normalized vs ion concentration. (c) Calibration plot for nickel ion detection in de-ionized water solutions (change in vs total concentration).
Internal standard addition assay for analysis of concentration in drinking water. change vs known injected concentration after an injection of drinking water (marked as tap water). Full line represents the fitting to Langmuir-like equation used to calculate concentration in drinking water and -peptide dissociation constant.
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