期刊
MICROCHIMICA ACTA
卷 189, 期 5, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-022-05295-5
关键词
Composite electrode; Laser-engraved graphene; Metal hexacyanoferrate; Hydrogen peroxide; Batch injection analysis; Amperometric detection
资金
- Brazilian agency FAPEMIG [RED-00042-16, APQ-03141-18]
- Brazilian agency CNPq [427731/2018-6, 307271/2017-0, 315838/2021-3, 163330/2020-4]
- Brazilian agency INCTBio (CNPq) [465389/2014-7]
- Brazilian agency CAPES [001]
- Brazilian agency INCT in Carbon Nanomaterials
- Brazilian agency GMIT research group - FAPEMIG [APQ-00330-14]
A laser-induced graphene (LIG) surface modified with Prussian blue (PB) was developed as a novel electrochemical sensing platform for hydrogen peroxide detection. This platform exhibited excellent sensing performance, including high stability, wide linear range, fast response, and satisfactory detection limit.
A laser-induced graphene (LIG) surface modified with Prussian blue (iron hexacyanoferrate) is demonstrated as a novel electrochemical sensing platform for the sensitive and selective detection of hydrogen peroxide. Electrochemical Prussian blue (PB) modification on porous graphene films engraved by infrared laser over flexible polyimide was accomplished. Scanning electron microscopy images combined with Raman spectra confirm the formation of porous graphene and homogenous electrodeposition of PB over this porous surface. Electrochemical impedance spectroscopy reveals a substantial decrease in the resistance to charge transfer values (from 395 to 31.4 Omega) after the PB insertion, which confirms the formation of a highly conductive PB-graphene composite. The synergistic properties of PB and porous graphene were investigated for the constant monitoring of hydrogen peroxide at 0.0 V vs. Ag&VERBARAgCl&VERBARKCl((sat)), under high-flow injections (166 mu L s(-1)) confirming the high stability of the modified surface and fast response within a wide linear range (from 1 to 200 mu mol L-1). Satisfactory detection limit (0.26 mu mol L-1) and selectivity verified by the analysis of complex samples confirmed the excellent sensing performance of this platform. We highlight that the outstanding sensing characteristics of the developed sensor were superior in comparison with other PB-based or LIG-based electrochemical sensors reported for hydrogen peroxide detection.
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