A Reagentless Amperometric Formaldehyde-Selective Chemosensor Based on Platinized Gold Electrodes

作者：Demkiv Olha; Smutok Oleh; Gonchar Mykhailo; Nisnevitch Marina

来源：Materials, 2017, 10(5): 503.

DOI：10.3390/ma10050503

• formaldehyde
• amperometric chemosensor
• platinized gold electrode

Fabrication and characterization of a new amperometric chemosensor for accurate formaldehyde analysis based on platinized gold electrodes is described. The platinization process was performed electrochemically on the surface of 4 mm gold planar electrodes by both electrolysis and cyclic voltamperometry. The produced electrodes were characterized using scanning electron microscopy and X-ray spectral analysis. Using a low working potential (0.0 V vs. Ag/AgCl) enabled an essential increase in the chemosensor's selectivity for the target analyte. The sensitivity of the best chemosensor prototype to formaldehyde is uniquely high (28180 A.M-1.m(-2)) with a detection limit of 0.05 mM. The chemosensor remained stable over a one-year storage period. The formaldehye-selective chemosensor was tested on samples of commercial preparations. A high correlation was demonstrated between the results obtained by the proposed chemosensor, chemical and enzymatic methods (R = 0.998). The developed formaldehyde-selective amperometric chemosensor is very promising for use in industry and research, as well as for environmental control.

• 出版日期2017-5