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Sensors 2015, 15(8), 18714-18723; doi:10.3390/s150818714

An Electrochemical Glucose Sensor Based on Zinc Oxide Nanorods

1
Microelectronics and Photonics graduate program, University of Arkansas, Fayetteville, AR 72701, USA
2
Department of Electrical Engineering, University of Arkansas, Fayetteville, AR 72701, USA
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Kagan Kerman
Received: 13 May 2015 / Revised: 29 June 2015 / Accepted: 22 July 2015 / Published: 30 July 2015
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Abstract

A glucose electrochemical sensor based on zinc oxide (ZnO) nanorods was investigated. The hydrothermal sol–gel growth method was utilized to grow ZnO nanorods on indium tin oxide-coated glass substrates. The total active area of the working electrode was 0.3 × 0.3 cm2 where titanium metal was deposited to enhance the contact. Well aligned hexagonal structured ZnO nanorods with a diameter from 68 to 116 nm were obtained. The excitonic peak obtained from the absorbance spectroscopy was observed at ~370 nm. The dominant peak of Raman spectroscopy measurement was at 440 cm−1, matching with the lattice vibration of ZnO. The uniform distribution of the GOx and Nafion membrane that has been done using spin coating technique at 4000 rotations per minute helps in enhancing the ion exchange and increasing the sensitivity of the fabricated electrochemical sensor. The amperometric response of the fabricated electrochemical sensor was 3 s. The obtained sensitivity of the fabricated ZnO electrochemical sensor was 10.911 mA/mM·cm2 and the lower limit of detection was 0.22 µM. View Full-Text
Keywords: electrochemical sensor; glucose; zinc oxide nanorods; electrode electrochemical sensor; glucose; zinc oxide nanorods; electrode
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. (CC BY 4.0).

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Marie, M.; Mandal, S.; Manasreh, O. An Electrochemical Glucose Sensor Based on Zinc Oxide Nanorods. Sensors 2015, 15, 18714-18723.

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