Abstract：
Herein, oxidized 3,3\',5,5\'-tetramethylbenzidine (oxTMB) nanobelts were developed to enhance the colorimetric and paper-based sensing of H2O2. It was found that the minor component of Fe2+ in Na2SO4 reagent could catalyze the oxidization of TMB by H2O2 into positively charged oxTMB, which was further assembled into dark blue oxTMB nanobelts via electrostatic interaction with SO42-. The extinction originating from the absorption and scattering of oxTMB nanobelts was utilized to quantitatively detect H2O2 with a wide linear detection range (1.0-300 μM) and a low limit of detection (0.48 μM). In addition, no coffee-ring effect was observed in the test zone of the paper-based colorimetric array, which was beneficial to judge the color by naked eye. Finally, the colorimetric method was applied to detect H2O2 in contact lens care solution. This work not only proposed a new colorimetric sensing platform for H2O2, but also highlighted the minor component in the reagent might influence the experimental result.
摘要：
在这里，氧化的3,3\'，开发了5,5'-四甲基联苯胺（oxTMB）纳米带，以增强H2O2的比色和纸基传感。研究发现，Na2SO4试剂中的少量Fe2成分可以催化H2O2将TMB氧化为带正电荷的oxTMB，通过与SO42-的静电相互作用进一步组装成深蓝色的oxTMB纳米带。源自oxTMB纳米带的吸收和散射的消光被用于定量检测H2O2，具有宽的线性检测范围（1.0-300μM）和低的检测限（0.48μM）。此外,在纸基比色阵列的测试区中没有观察到咖啡环效应，有利于肉眼判断颜色。最后,采用比色法检测隐形眼镜护理液中的H2O2。这项工作不仅提出了一种新的H2O2比色传感平台，而且还强调了试剂中的次要成分可能会影响实验结果。
