Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560 012, India.
Analyst. 2014 Apr 7;139(7):1789-95. doi: 10.1039/c3an02014b.
Nanodendritic Pd electrodeposited on poly(3,4-ethylenedioxythiophene) (PEDOT) modified Pd nanodendrite electrodes has been studied for electroanalysis of As(III) in 1 M HCl solution. The Pd nanodendrites are grown on a porous thin film of PEDOT by electrodeposition process. Pd-PEDOT/C electrodes are characterized by physicochemical and electrochemical studies. Cyclic voltammetry studies show that Pd-PEDOT/C electrodes exhibit greater electrocatalytic activity towards As(iii)/As(0) redox reaction than the Pd/C electrodes. Differential pulse anodic stripping voltammetry (DPASV) is performed for analysis of As(iii) ion at pH 1.0. The Pd-PEDOT/C electrode is highly sensitive towards As(III) detection with sensitivity of 1482 μA cm(-2) μM(-1). A wide detection range up to 10 μM and low detection limit of 7 nM (0.52 ppb) are obtained with a pre-deposition time of 120 s under optimum conditions. High sensitivity and low detection limit obtained on Pd-PEDOT/C, for the first time in the literature, are attractive from a practical view point. Interference studies of Cu(II) ions are investigated and it is observed that Cu(II) ions do not interfere.
在 1 M HCl 溶液中，研究了在聚（3,4-乙二氧基噻吩）（PEDOT）修饰的 Pd 纳米枝晶电极上电沉积的纳米枝状 Pd 对 As(III)的电分析。通过电沉积过程在多孔的 PEDOT 薄膜上生长 Pd 纳米枝晶。通过物理化学和电化学研究对 Pd-PEDOT/C 电极进行了表征。循环伏安研究表明，与 Pd/C 电极相比，Pd-PEDOT/C 电极对 As(iii)/As(0)氧化还原反应具有更大的电催化活性。在 pH 1.0 下进行差分脉冲阳极溶出伏安法（DPASV）分析 As(III)离子。Pd-PEDOT/C 电极对 As(III)检测具有高灵敏度，灵敏度为 1482 μA cm(-2) μM(-1)。在最佳条件下，预沉积时间为 120 s 时，检测范围可达 10 μM，检测限低至 7 nM（0.52 ppb）。从实用的角度来看，Pd-PEDOT/C 获得的高灵敏度和低检测限是首次在文献中报道的。研究了 Cu(II)离子的干扰，观察到 Cu(II)离子不干扰。
