Detection of lead ions with AlGaAs/InGaAs pseudomorphic high electron mobility transistor |
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Authors: | Niu Jiqiang Zhang Yang Guan Min Wang Chengyan Cui Lijie Yang Qiumin Li Yiyang |
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Affiliation: | Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China |
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Abstract: | Lead poisoning is a serious environmental concern, which is a health threat. Existing technologies always have some drawbacks, which restrict their application ranges, such as real time monitoring. To solve this problem, glutathione was functionalized on the Au-coated gate area of the pseudomorphic high electron mobility transistor (pHEMT) to detect trace amounts of Pb2+. The positive charge of lead ions will cause a positive potential on the Au gate of the pHEMT sensor, which will increase the current between the source and the drain. The response range for Pb2+ detection has been determined in the concentrations from 0.1 pmol/L to 10 pmol/L. To our knowledge, this is currently the best result for detecting lead ions. |
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Keywords: | Environmental monitoring AlGaAs/InGaAs pHEMT biosensor |
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