Formaldehyde Sensors Based on Chemically Modified Electrodes With Platinum Particles and Carbon Nanotubes

Platinum particles were electrochemically deposited on glassy carbon electrodes modified by carbon nanotubes. The chemically modified glassy carbon electrodes with platinum particles and carbon nanotubes (Pt/CNTs/GCE) were used as formaldehyde sensors. Electrochemical behaviors of formaldehyde at Pt/ CNTs/GCE were investigated by cyclic voltammetry (CV) and linear scan voltammetry (LSV). Experimental conditions were optimized, and a voltammetric method for determining formaldehyde was developed. The experimental results show that the optimum accumulation potential is - 0.1 V and the optimum accumulation time is 180 s. A highly linear response to formaldehyde in the concentration range of 8.0umol/L- 1.0 mmol/L was observed in 0.01 mol/LH₂SO₄, with a detection limit of 3.0 umol/L estimated at a signal-to-noise ratio of 3: 1. The presented method of determining formaldehyde exhibits high sensitivity and good reproducibility.