Zhang Bo, Zhang Yanhui, White Henry S
Departments of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA.
Anal Chem. 2004 Nov 1;76(21):6229-38. doi: 10.1021/ac049288r.
The fabrication and electrochemical characterization of truncated cone-shaped nanopore electrodes are reported. A nanopore electrode is a Pt disk electrode embedded at the bottom of a conical pore, the circular orifice of the pore having nanometer dimensions. The electrochemical properties of nanopore electrodes with orifice radii of 39 and 74 nm are presented. Both the steady-state and transient voltammetric behavior of the nanopore electrode are reported and compared to predictions obtained using finite-element simulations. The truncated cone-shaped pore electrode possesses a unique transport property-the steady-state flux of molecules into a deep pore is limited by the restriction near the pore orifice, and thus, the steady-state current is independent of the pore depth. This characteristic is potentially useful in studying transport through nanometer-scale orifices.
报道了截顶锥形纳米孔电极的制备及其电化学表征。纳米孔电极是嵌入在锥形孔底部的铂盘电极，该孔的圆形孔口具有纳米尺寸。给出了孔半径为39纳米和74纳米的纳米孔电极的电化学性质。报道了纳米孔电极的稳态和瞬态伏安行为，并与使用有限元模拟得到的预测结果进行了比较。截顶锥形孔电极具有独特的传输特性——分子进入深孔的稳态通量受孔口附近的限制，因此稳态电流与孔深度无关。这一特性在研究通过纳米级孔口的传输方面可能很有用。
