Layer-by-layer assembled DNA-functionalized single-walled carbon nanotube hybrids-modified electrodes for 2,4,6-trinitrotoluene detection
Layer-by-layer assembled DNA-functionalized single-walled carbon nanotube hybrids-modified electrodes for 2,4,6-trinitrotoluene detection
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DOI：
10.1016/j.jelechem.2009.09.021
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发表时间：
2009-12-15
影响因子：
4.5
通讯作者：
Wei, Wanzhi
中科院分区：
文献类型：
--
作者：
Liu, Yaxiong;Lan, Dan;Wei, Wanzhi
开发了用 DNA 功能化单壁碳纳米管杂化物逐层修饰的优质碳电极，用于检测 2,4,6-三硝基甲苯。通过原子力显微镜检查了DNA功能化单壁碳纳米管杂化物的特性。与单独的单壁碳纳米管修饰电极相比，DNA功能化的单壁碳纳米管杂化物修饰电极由于提供了大量的π电子和氢键结合位点，表现出更优越的检测2,4,6-三硝基甲苯的能力，包括更高的灵敏度和更低的过电势。该修饰电极对2,4,6-三硝基甲苯表现出快速响应，可在15 s内完成检测。该修饰电极的检测限为0.5μgL(-1)，线性范围至少高达800μgL(-1)。稳定性测试显示，使用相同的修饰电极进行 40 次连续运行的平均相对标准偏差为 3.5%，并且从一种电极制备到另一种电极制备的 2,4,6-三硝基甲苯响应的再现性在 5.1% 以内 (n = 10)。此外，该修饰电极也适用于分析加标地下水中的 2,4,6-三硝基甲苯。 (C) 2009 Elsevier B.V. 保留所有权利。
Classy carbon electrode modified with DNA-functionalized single-walled carbon nanotube hybrids by layer-by-layer was developed for the detection of 2,4,6-trinitrotoluene. The characteristic of the DNA-functionalized single-walled carbon nanotube hybrids was examined by atomic force microscope. Compares with single-walled carbon nanotubes-alone modified electrode, DNA-functionalized single-walled carbon nanotube hybrids-modified one exhibited the more superior ability of detecting 2,4,6-trinitrotoluene, including the higher sensitivity and the lower overpotentials, due to plenty of pi-electrons and hydrogen bond binding sites were provided. This modified electrode showed a fast response towards 2,4,6-trinitrotoluene and the detection could be finished within 15 s. A limit of detection of 0.5 mu g L(-1) was obtained by this modified electrode with a linear range at lest up to 800 mu g L(-1). Stability test showed an average relative standard deviation of 3.5% for 40 consecutive runs with a same modified electrode and the reproducibility of the responses of 2,4,6-trinitrotoluene was within 5.1% from one electrode preparation to another (n = 10). And also, the applicability of this modified electrode was demonstrated for the analysis of 2,4,6-trinitrotoluene in spiked groundwater. (C) 2009 Elsevier B.V. All rights reserved.