The mass transfer of analytes is a major limiting factor of electrochemical response at vertically-aligned carbon nanotube nanoelectrode arrays (VCNs). In this study, the dependence of the mass transfer coefficient on the array diameter and force convection is studied experimentally. The mass transfer coefficient is shown to increase 2 folds by reducing the array diameter from 2 mm to 50 μm, while it increases 20 folds by introducing force convection at the flow rate 2000 μL min⁻¹. The VCNs used with channel flow voltammetry exhibit low limit of detection (5 nM), high sensitivity, and wide linear range for detecting both K₃Fe(CN)₆ and dopamine. The VCNs can be used on lab-on-a-chip systems for analytical applications. It is anticipated a combined approach of reducing array diameter and introducing forced convection can be used to significantly improve electrochemical responses of other nanoelectrode arrays.

在垂直排列的碳纳米管纳米电极阵列（VCN）上，分析物的质量转移是电化学响应的主要限制因素。在这项研究中，通过实验研究了传质系数对阵列直径和力对流的依赖性。通过将阵列直径从2 mm减小到50μm，传质系数显示增加了2倍，而通过以2000μLmin ^-1的流速引入力对流，传质系数增加了20倍。与通道流动伏安法一起使用的VCN的检测下限（5 nM）低，灵敏度高，并且可以检测K ₃ Fe（CN）_6的线性范围宽和多巴胺。VCN可以在芯片实验室系统上用于分析应用。预期减小阵列直径和引入强制对流的组合方法可用于显着改善其他纳米电极阵列的电化学响应。