Detection of formaldehyde by cyclic voltammetry using a PANI/GO composite film–modified electrode

In the present work, we described the preparation of polyaniline-graphene oxide composite film (PANI/GO) by the stirring electropolymerization method and then it was characterized. A graphite rod electrode (GE) modified with the composite film showed enhanced electrochemical sensing capability for formaldehyde solution. Cyclic voltammetry showed an increase in the formaldehyde oxidation peak current at the GE modified with PANI/GO (GO/PANI/GE). The sensitivity in the linear segment was 502.42 μA mM −1 cm −2 . The oxidation peak current increased linearly with increasing formaldehyde concentration from 0.1 to 20 μM. The detection limit was 0.0185 µM ( S / N = 3). In addition, the sensor displays an acceptable repeatability and reproducibility along with appreciable storage and excellent operational stabilities.