PDMS-based gold electrode for sensing ascorbic acid

Electrode with optical shapes is appreciated in microfluidics. In this article, we reported a flexible poly(dimethylsiloxane) (PDMS)-based gold electrode for ascorbic acid detection. Gold nanoparticles were chemically deposited on PDMS and the composite film was applied as working electrode. The electrode could undergo deformation and display good response performance without damage. This biosensor could give quick response to ascorbic acid (AA) (<5 s) and the currents were linear with concentrations of AA in range of 0.023–7.00 mM and 30–100 mM, respectively. Limit of detection was 0.008 mM (S/N = 3). This biosensor has been applied to determine ascorbic acid content in vitamin C tablets and the results were consistent with traditional iodometric method.