Study of acidosis, neutral and alkalosis media effects on the behaviour of activated carbon threads decorated by zinc oxide using extended gate FET for glucose sensor application

• Published in: Materials science in semiconductor processing Vol. 108; p. 104911
• Main Authors: Khalifa, Ali M., Abdulateef, S.A., Kabaa, E.A., Ahmed, Naser M., Sabah, Fayroz A.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.03.2020
• Subjects: Active carbon threads; Extended gate field-effect transistor; Glucose sensor; ZnO microrods; ZnO microrods; Glucose sensor; Active carbon threads; Extended gate field-effect transistor
• ISSN: 1369-8001; 1873-4081
• DOI: 10.1016/j.mssp.2019.104911

In recent times, semiconductor-carbon composite microstructure offers new prospects in bio-chemical sensor research. In this study, hexagonally structured zinc oxide micro rods (ZnOMRs) were synthesized on activated carbon threads (ACTs) using the chemical bath in the absence of a ZnO seed layer. The ZnOMRs/ACTs based extended gate field effect transistor (EGFET) was characterized as a bio-chemical sensor for pH and glucose in acidosis, neutral and alkalosis media. The ZnOMRs/ACTs based EGFET sensor exhibited glucose sensitivities in terms of reference voltage (VRef) of (20.71, 18.21, and 16.72) mV/mM and drain source current (IDS) of (29.00, 25.60, and 23.62) μA/mM for pH values of 7.2, 7.4, and 7.6, respectively, at room temperature. Thus, the glucose sensitivity of the ZnOMRs/ACTs based EGFET increased with decrease in pH, due to the increased participation of hydrogen ions in the electrochemical exchange reaction between the solution and ZnOMRs/ACTs electrode. Based on the high sensitivity, ZnOMRs/ACTs composite could be a favourable micromaterial for bio-chemical sensor applications.