Sensing of nitric oxide using a glassy carbon electrode modified with an electrocatalytic film composed of dihexadecyl hydrogen phosphate, platinum nanoparticles, and acetylene black

Abstract

Platinum nanoparticles were electrodeposited onto a film of dihexadecyl hydrogen phosphate deposited on a glassy carbon electrode (GCE) and modified with dispersed acetylene black. Scanning electron microscopy and electrochemical impedance spectroscopy revealed that this nanocomposite has a uniform nanostructure and a large surface area that enables fast electron-transfer kinetics. The modified GCE showed high electrocatalytic activity for the oxidation of nitric oxide (NO). Under optimal conditions, the oxidation peak current of nitric oxide is linearly related to the concentration of NO in the concentration range between 0.18 and 120 μM, and the detection limit is as low as 50 nM (at an S/N of 3). The modified electrode was successfully applied to sensing of NO as released from rat liver. Figure Acetylene black (AB) was dispersed with dihexadecyl hydrogen phosphate (DHP) and modified on the surface of glassy carbon electrode (GCE) to fabricate AB/GCE, after activating in NaOH solution, the AB film became more porous and loosened, then through electrodepositing Pt nanoparticles (PtNPs) on the activated AB film, PtNP/AB/GCE was obtained, which was denoted as NO electrochemical sensor.