Conventional surfactant-doped poly (o-anisidine)/GO nanocomposites for benzaldehyde chemical sensor development

Abstract

We report on the synthesis of conventional surfactant dodecylbenzenesulfonic acid-doped poly (o-anisidine)/graphene oxide composite (DPOMA/GO), a ortho-methoxy substituted derivative of anisidine, by in situ oxidative polymerization method. A mixture of Na2S2O8 in HCl was used as oxidant, while dodecylbenzenesulfonic acid was used as both dopant and surfactant. The physicochemical characterization was carried out using a field-emission scanning electron microscope and X-ray crystallography (XRD), Fourier transforms infrared, UV–Vis, and simultaneous thermo-gravimetric analysis study. Then, the DPOMA/GO nanocomposites were used to construct nonenzymatic sensors in practical with I–V technique, where the total analytical parameters were measured. The DPOMA/GO nanocomposites were deposited on flat silver electrode (AgE; surface area ~0.0216 cm2) to result in a sensor that has a fast response to selective benzaldehyde in buffer system. Features including sensitivity, detection limit, reproducibility, linear dynamic range, selectivity, and electrochemical performances were investigated in detail with the DPOMA/GO nanocomposites-fabricated AgE electrodes. The calibration plot is linear (r 2 0.9699) over the large concentration range (0.1 nM–0.1 mM). The sensitivity and detection limit are calculated as ~1.2277 µA cm−2 µM−2 and 0.03 nM (at a signal-to-noise ratio of 3), respectively.