Center for Research On Electroanalysis, Institute of Chemistry, Federal University of Uberlândia, Uberlandia, MG, 38408-100, Brazil.
Institute of Chemistry, Federal University of Uberlândia, Uberlandia, MG, 38408-100, Brazil.
Mikrochim Acta. 2022 Apr 11;189(5):188. doi: 10.1007/s00604-022-05295-5.
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.
激光诱导石墨烯（LIG）表面修饰普鲁士蓝（铁六氰合铁酸盐），可作为一种新型电化学传感平台，用于灵敏和选择性检测过氧化氢。通过红外激光在柔性聚酰亚胺上刻蚀多孔石墨烯薄膜，实现了电化学普鲁士蓝（PB）的修饰。扫描电子显微镜图像和拉曼光谱证实了多孔石墨烯的形成以及 PB 在多孔表面上的均匀电沉积。电化学阻抗谱表明，在插入 PB 后，电荷转移电阻值（从 395 到 31.4 Ω）显著降低，这证实了高导电性 PB-石墨烯复合材料的形成。研究了 PB 和多孔石墨烯的协同特性，以在 0.0 V 相对于 Ag|AgCl|KCl 下对过氧化氢进行恒流监测，在高流量注入（166 µL s）下，证实了修饰表面的高稳定性和在宽线性范围内的快速响应（从 1 到 200 µmol L）。通过对复杂样品的分析验证了令人满意的检测限（0.26 µmol L）和选择性，证实了该平台的出色传感性能。我们强调，与其他报道的用于过氧化氢检测的基于 PB 或 LIG 的电化学传感器相比，所开发的传感器具有卓越的传感特性。
