Highly sensitive and reusable Pt-black microfluidic electrodes for long-term electrochemical sensing.

Biosensors & Bioelectronics
Liangliang QiangFotios Papadimitrakopoulos

Abstract

Highly sensitive, long-term stable and reusable microfluidics electrodes have been fabricated and evaluated using H2O2 and hydroquinone as model analytes. These electrodes composed of a 300 nm Pt-black layer situated on a 5 μm thick electrodeposited Au layer, provide effective protection against electrooxidation of an underlying chromium adhesion layer. Using repeated cyclic voltammetric (CV) sweeps in flowing buffer solution, highly sensitive Pt-black working electrodes were realized with five- (four-) decade linear dynamic range for H2O2 (hydroquinone) and low detection limit of 10 nM for H2O2 and 100 nM for hydroquinone. Moreover, high sensitivity for H2O2 was demonstrated at low (0.3 V vs. Ag/AgCl) oxidation potentials, together with long-term stability and reusability for at least 30 days. Microfluidic flow was employed for desorption and reactivation of the nominally planar Pt-black electrodes. Such electrocatalytic surface architecture should be appropriate for long-term electrochemical detection of various molecules and biomolecules as well as in reusable immunoassay configurations.

Citations

Apr 18, 2012·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Shaurya PrakashBharat Bhushan
Feb 26, 2015·Applied Physics Letters·Vikhram Vilasur SwaminathanRashid Bashir
Apr 10, 2013·Journal of Diabetes Science and Technology·Santhisagar VaddirajuFotios Papadimitrakopoulos
Jan 7, 2014·Journal of Materials Chemistry. B, Materials for Biology and Medicine·James F RuslingFotios Papadimitrakopoulos
Mar 29, 2020·Science Advances·Yichao ZhaoSam Emaminejad

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