AI Article Synopsis
- A novel electrochemical sensing platform using laser-induced graphene modified with Prussian blue has been developed for detecting hydrogen peroxide with high sensitivity and selectivity.
- The porous graphene films were created using infrared laser on flexible polyimide, and their properties were confirmed by scanning electron microscopy and Raman spectroscopy.
- The PB-graphene composite showed significant improvements in charge transfer resistance, fast response times, and a low detection limit, outperforming other existing sensors for hydrogen peroxide detection.
Article Abstract
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 Ω) 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|AgCl|KCl, under high-flow injections (166 µL s) confirming the high stability of the modified surface and fast response within a wide linear range (from 1 to 200 µmol L). Satisfactory detection limit (0.26 µmol L) 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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| http://dx.doi.org/10.1007/s00604-022-05295-5 | DOI Listing |
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