期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 587, 期 2, 页码 276-283出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2005.11.021
关键词
DNA sensor; free-label detection; DNA-modified polythiophene; electrochemical impedance spectroscopy
A conducting polythiophene sensor for direct label-free DNA detection is investigated by electrochemical impedance spectroscopy (EIS) and by quartz crystal microbalance. The end-modified DNA probe is covalently immobilized by using a new anchorage function. The hybridization detection is studied by EIS experiments. An equivalent circuit is suggested and the variations of individual values of parameters deduced from impedance fits are connected to the change of conformation during the hybridization process. (c) 2005 Elsevier B.V. All rights reserved.
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