Department of Electrical Engineering, Indian Institute of Technology, Hyderabad 502285, India.
Department of Electrical Engineering, Indian Institute of Technology, Hyderabad 502285, India.
Mater Sci Eng C Mater Biol Appl. 2020 Jun;111:110806. doi: 10.1016/j.msec.2020.110806. Epub 2020 Mar 2.
We report a novel, facile hydrothermal synthesis of bismuth vanadate (BiVO) nanoflakes coated with polyaniline (PANI) via electrodeposition on screen-printed carbon electrode (SPCE) for trace level detection of arsenic in biological samples. The crystallinity and monoclinic scheelite structure of as-synthesised BiVO nanoflakes was analysed using X-Ray diffraction (XRD) and the surface morphology and chemical analysis of the flake-like BiVO and PANI coated BiVO modified SPCE (PANI@BiVO/SPCE) were studied using Field emission scanning electron microscopy (FESEM), Raman spectroscopy and Fourier transform infrared spectroscopy (FTIR). The presence of VO tetrahedra and VO group along with oxy-functional groups were confirmed using Raman and FTIR analysis, respectively. Under optimized conditions, the sensor could detect As ions via differential pulse anodic stripping voltammetry (DPASV) technique with remarkable low limit of detection (LOD) of 0.0072 ppb (which is far below the MCL testified values) and exhibited a sensitivity of 6.06 μA ppb cm for a linear range of 0.01 to 300 ppb. This improved sensing aptitude can be ascribed to the synergetic effect of PANI and BiVO by providing high electrical conductivity and high electrocatalytic active sites via VO tetrahedra, respectively. The sensor showed an outstanding selectivity in detection of As ions in trace levels in simulated blood serum samples with excellent recovery percentages thus making it an ideal platform to develop numerous electrochemical sensing platforms for bioanalytical applications.
我们报告了一种新颖、简便的水热合成方法，通过在丝网印刷碳电极（SPCE）上电沉积，在铋钒酸盐（BiVO）纳米薄片上涂覆聚苯胺（PANI），用于痕量生物样品中砷的检测。采用 X 射线衍射（XRD）分析了合成的 BiVO 纳米薄片的结晶度和单斜白钨矿结构，用场发射扫描电子显微镜（FESEM）、拉曼光谱和傅里叶变换红外光谱（FTIR）研究了片状 BiVO 和涂覆 PANI 的 BiVO 修饰 SPCE（PANI@BiVO/SPCE）的表面形态和化学分析。拉曼和 FTIR 分析分别证实了 VO 四面体和 VO 基团以及含氧官能团的存在。在优化条件下，该传感器可通过差分脉冲阳极溶出伏安法（DPASV）技术检测 As 离子，检测限（LOD）低至 0.0072 ppb（远低于经测试的 MCL 值），线性范围为 0.01 至 300 ppb，灵敏度为 6.06 μA ppb cm。这种改进的传感能力可归因于 PANI 和 BiVO 的协同效应，分别通过 VO 四面体提供高导电性和高电催化活性位点。该传感器在模拟血清样品中痕量水平检测 As 离子时表现出出色的选择性，回收率非常高，因此是开发用于生物分析应用的众多电化学传感平台的理想平台。
