School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798.
Nanoscale. 2011 Nov;3(11):4854-8. doi: 10.1039/c1nr10899a. Epub 2011 Oct 14.
Electrochemical electrodes based on dense and vertically aligned arrays of multi-walled carbon nanotubes (MWCNTs) were produced. The open tips of individual hollow nanotubes are exposed as active sites while the entangled nanotube stems encapsulated in epoxy collectively provide multiplexed and highly conductive pathways for charge transport. This unique structure together with the extraordinary electrical and electrochemical properties of MWCNTs offers a high signal-to-noise ratio (thus high sensitivity) and a large detection range, compared with other carbon-based electrodes. Our electrodes can detect K(3)FeCN(6) and dopamine at concentrations as low as 5 nM and 10 nM, respectively, and are responsive in a large dynamic range that spans almost 5 orders of magnitude.
基于密集且垂直排列的多壁碳纳米管 (MWCNT) 阵列的电化学电极被制备出来。单个中空纳米管的开口尖端暴露为活性位点，而包裹在环氧树脂中的缠结纳米管茎则共同提供了用于电荷传输的多路复用和高导电性途径。与其他基于碳的电极相比，这种独特的结构以及 MWCNT 的非凡的电学和电化学性质提供了高信噪比（因此高灵敏度）和大检测范围。我们的电极可以分别检测到浓度低至 5 nM 和 10 nM 的 K(3)FeCN(6)和多巴胺，并且在跨越近 5 个数量级的大动态范围内具有响应性。
