Sensors 2011, 11(5), 4648-4655; doi:10.3390/s110504648
Article

Investigation of a Photoelectrochemical Passivated ZnO-Based Glucose Biosensor

Received: 22 February 2011; in revised form: 27 March 2011 / Accepted: 22 April 2011 / Published: 28 April 2011
(This article belongs to the Special Issue Semiconductor Sensors)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: A vapor cooling condensation system was used to deposit high quality intrinsic ZnO thin films and intrinsic ZnO nanorods as the sensing membrane of extended-gate field-effect-transistor (EGFET) glucose biosensors. The sensing sensitivity of the resulting glucose biosensors operated in the linear range was 13.4 μA mM−1 cm−2. To improve the sensing sensitivity of the ZnO-based glucose biosensors, the photoelectrochemical method was utilized to passivate the sidewall surfaces of the ZnO nanorods. The sensing sensitivity of the ZnO-based glucose biosensors with passivated ZnO nanorods was significantly improved to 20.33 μA mM−1 cm−2 under the same measurement conditions. The experimental results verified that the sensing sensitivity improvement was the result of the mitigation of the Fermi level pinning effect caused by the dangling bonds and the surface states induced on the sidewall surface of the ZnO nanorods.
Keywords: extended-gate field-effect-transistors; photoelectrochemical method; vapor cooling condensation technique; ZnO-based glucose biosensors; ZnO nanorods
PDF Full-text Download PDF Full-Text [496 KB, uploaded 21 June 2014 03:39 CEST]

Export to BibTeX |
EndNote


MDPI and ACS Style

Lee, C.-T.; Chiu, Y.-S.; Ho, S.-C.; Lee, Y.-J. Investigation of a Photoelectrochemical Passivated ZnO-Based Glucose Biosensor. Sensors 2011, 11, 4648-4655.

AMA Style

Lee C-T, Chiu Y-S, Ho S-C, Lee Y-J. Investigation of a Photoelectrochemical Passivated ZnO-Based Glucose Biosensor. Sensors. 2011; 11(5):4648-4655.

Chicago/Turabian Style

Lee, Ching-Ting; Chiu, Ying-Shuo; Ho, Shu-Ching; Lee, Yao-Jung. 2011. "Investigation of a Photoelectrochemical Passivated ZnO-Based Glucose Biosensor." Sensors 11, no. 5: 4648-4655.

Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert