Steady-state voltammetric response of the nanopore electrode

被引:97
作者
Zhang, B [1 ]
Zhang, YH [1 ]
White, HS [1 ]
机构
[1] Univ Utah, Dept Chem, Salt Lake City, UT 84112 USA
关键词
D O I
10.1021/ac051330a
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The steady-state voltammetric response of the truncated conical-shaped glass nanopore electrode is presented. Analytical theory, finite-element simulations, and experimental measurement of the diffusive flux of a redox molecule through the pore orifice demonstrate that the steady-state current decreases rapidly as the pore depth increases and then asymptotically approaches a constant value when the pore depth is similar to 50 x larger than the pore orifice. The asymptotic limit of the steady-sate current is only a function of the pore orifice radius and the cone angle of the pore and has a finite value for all cone angles greater than zero. Experimental confirmation of the predicted dependence on pore depth is obtained using nanopore electrodes with 100-1000 nm orifice radii, by measuring the steady-state voltammetric current corresponding to the oxidation of ferrocene in acetonitrile solutions containing an excess of supporting electrolyte.
引用
收藏
页码:477 / 483
页数:7
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