The fabrication and electrochemical characterization of carbon nanotube nanoelectrode arrays
The fabrication and electrochemical characterization of carbon nanotube nanoelectrode arrays
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DOI：
10.1039/b311728f
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发表时间：
2004-02-21
影响因子：
--
通讯作者：
Meyyappan, M
中科院分区：
文献类型：
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作者：
Koehne, J;Li, J;Meyyappan, M
我们报告了一种使用嵌入 SiO2 基质中的垂直排列的多壁碳纳米管 (MWCNT) 制造纳米电极阵列的新方法。采用循环伏安法和脉冲伏安法来表征多壁碳纳米管阵列的电化学性能。新型多壁碳纳米管纳米电极独特的石墨结构与高取向热解石墨和玻碳电极等模型系统进行了比较。低密度 MWCNT 纳米电极阵列显示出独立的纳米电极行为，在宽范围的扫描速率下循环伏安法中显示出扩散限制的稳态电流。电活性物质可以在低至几个 nM 的浓度下被检测到。此外，使用低密度 MWCNT 阵列和选择性功能化寡核苷酸探针演示了超灵敏 DNA/RNA 传感器。该平台可广泛用于分析应用以及基础电化学研究。
We report a novel approach for the fabrication of nanoelectrode arrays using vertically aligned multi-walled carbon nanotubes (MWCNTs) embedded within a SiO2 matrix. Cyclic voltammetry and pulse voltammetry are employed to characterize the electrochemical properties of the MWCNT array. The unique graphitic structure of the novel MWCNT nanoelectrodes is compared with model systems such as highly oriented pyrolytic graphite and glassy carbon electrodes. Low-density MWCNT nanoelectrode arrays display independent nanoelectrode behavior showing diffusion-limited steady-state currents in cyclic voltammetry over a wide range of scan rates. Electroactive species can be detected at concentrations as low as a few nM. In addition, ultrasensitive DNA/RNA sensors are demonstrated using the low-density MWCNT arrays with selectively functionalized oligonucleotide probes. This platform can be widely used in analytical applications as well as fundamental electrochemical studies.