標題: Label-free detection of DNA using novel organic-based electrolyte-insulator-semiconductor
作者: Lin, Tsung-Wu
Kekuda, Dhananjay
Chu, Chih-Wei
光電工程學系
Department of Photonics
關鍵字: Organic semiconductor;Electrolyte-insulator-semiconductor;pH sensor;DNA biosensor
公開日期: 15-八月-2010
摘要: In this study, we have constructed the first organic field effect sensor based on an electrolyte-insulator-semiconductor structure (OEIS) and applied this novel device to pH and DNA sensing. Variations in the insulator-electrolyte surface potential, which originate from either the change of the ionization states of the insulator surface groups or the binding of charged molecules to the insulator surface, modify the flat band voltage (V(FB)) of the OEIS sensor. The pH sensing experiments of OEIS sensor showed that the output signal linearly depended on pH solution in the range from pH 2 to pH 12, and an average sensitivity of 44.1 mV/pH was obtained. In the biosensing experiments, the absorption of positively charged poly-L-lysine on the insulator surface resulted in the reduction of the V(FB) value, whereas the subsequent binding of negatively charged single-stranded DNA probe (ssDNA) via electrostatic interaction increased the VFB value. Furthermore, the ssDNA-immobilized OEIS device was successfully used for the detection of DNA hybridization. The detection limit of complementary DNA was as low as 1 mu M, and the output signal of OEIS biosensor linearly increased with the logarithm of complementary DNA concentration in the range from 5 x 10(-5) to 10(-7) M. The easy and inexpensive fabrication of the OEIS device allows to be served as a potentially disposable and sensitive biosensor. (C) 2010 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.bios.2010.04.041
http://hdl.handle.net/11536/32299
ISSN: 0956-5663
DOI: 10.1016/j.bios.2010.04.041
期刊: BIOSENSORS & BIOELECTRONICS
Volume: 25
Issue: 12
起始頁: 2706
結束頁: 2710
顯示於類別:期刊論文


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  1. 000279538700027.pdf