Gupte Tanvi, Jana Sourav Kanti, Mohanty Jyoti Sarita, Srikrishnarka Pillalamarri, Mukherjee Sritama, Ahuja Tripti, Sudhakar Chennu, Thomas Tiju, Pradeep Thalappil
ACS Appl Mater Interfaces. 2019 Aug 7;11(31):28154-28163. doi: 10.1021/acsami.9b06023. Epub 2019 Jul 25.
A simple, one-step electrodeposition approach has been used to fabricate MnO on an indium-doped tin oxide substrate for highly sensitive As detection. We report an experimental limit of detection of 1 ppb through anodic stripping voltammetry with selectivity to As in the presence of 10 times higher concentrations of several metal ions. Additionally, we report the simultaneous phase evolution of active material occurring through multiple stripping cycles, wherein MnO/MnO eventually converts to MnO as a result of change in the oxidation states of manganese. This occurs with concomitant changes in morphology. Change in the electronic property (increased charge transfer resistance) of the material due to sensing results in an eventual decrease in sensitivity after multiple stripping cycles. In a nutshell, this paper reports stripping-voltammetry-induced change in morphology and phase of as-prepared Mn-based electrodes during As sensing.
一种简单的一步电沉积方法已被用于在铟掺杂氧化锡基板上制备MnO，用于高灵敏度的砷检测。我们报告了通过阳极溶出伏安法实现的1 ppb的实验检测限，在存在浓度高出10倍的几种金属离子的情况下对砷具有选择性。此外，我们报告了通过多个溶出循环发生的活性材料的同时相演变，其中MnO/MnO最终由于锰氧化态的变化而转化为MnO。这伴随着形态的变化。由于传感导致材料的电子性质发生变化（电荷转移电阻增加），在多个溶出循环后最终导致灵敏度降低。简而言之，本文报道了在砷传感过程中，溶出伏安法引起的所制备的锰基电极的形态和相的变化。
