DNA Wrapped Metallic Single-walled Carbon Nanotube Sensor for Pb (II) Detection
DNA Wrapped Metallic Single-walled Carbon Nanotube Sensor for Pb (II) Detection
复制标题
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:
影响因子:
--
通讯作者:
Zhao, H.
中科院分区:
文献类型:
--
作者:
Lian, Y.;Yuan, M.;Zhao, H.
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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