DNA Wrapped Metallic Single-walled Carbon Nanotube Sensor for Pb (II) Detection

DNA Wrapped Metallic Single-walled Carbon Nanotube Sensor for Pb (II) Detection
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用于 Pb (II) 检测的 DNA 包裹金属单壁碳纳米管传感器

DOI:
10.1080/1536383x.2012.690462
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发表时间:
2014-01
期刊:
Fullerenes, Nanotubes, and Carbon Nanostructures
影响因子:
--
通讯作者:
Zhao, H.
Zhao, H.
中科院分区:
其他
文献类型:
--
作者:
Lian, Y.;Yuan, M.;Zhao, H.

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基于Pb(II)离子通过脱氧核糖核酸结构中的磷酸基团和核酸碱基与核酸的相互作用,制备了一种DNA包裹金属单壁碳纳米管(SWNT)电化学传感器,用于灵敏、选择性地检测Pb(II)离子.该传感器对Pb 2+的含量有快速的微分脉冲伏安信号响应,在pH5.0的缓冲溶液中,Pb 2+的线性响应范围为1 × 10−9 ~ 1.0 × 10−8 mol L−1(R = 0.9979),检测限为4.1 × 10−10 mol L−1。该传感器对其他金属离子的微分脉冲伏安信号响应可忽略不计,表明其对Pb 2+具有很高的选择性。电化学阻抗谱和循环伏安法研究表明,金属单壁碳纳米管的加入对扩大传感器的电流响应和提高传感器的灵敏度有重要作用。
Based on the interaction of Pb (II) ions with nucleic acid via phosphate groups and nucleic bases of the deoxyribonucleic acid structure, an electrochemical sensor with DNA wrapped metallic single-walled carbon nanotube (SWNT) has been fabricated for sensitive and selective detection of lead ion (Pb2+). The sensor shows a rapid differential pulse voltammetry signal response to the content of Pb2+, and a quantitative detection of Pb2+ has been established with an expanded linear responsive range from 1 × 10−9 to 1.0 × 10−8 mol L−1 (R = 0.9979) and a detection limit of 4.1 × 10−10 mol L−1 in buffer solution (pH 5.0). Furthermore, the sensor displayed a negligible differential pulse voltammetry signal response for other metal ions, indicating its high selectivity for Pb2+. The investigation of electrochemical impedance spectroscopy and cyclic voltammetry in buffer solution demonstrated that metallic SWNTs played an important role in enlarging current response and increasing sensitivity of the sensor.
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