期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 853, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.156900
关键词
Nitrogen doping; Glucose detection; Plasma etching; Binder less deposition; CuO; Cu2O; Phase transformation
资金
- National Research Foundation (NRF) South Africa [117686]
- Cape Peninsula university technology [117686]
Plasma-assisted nitrogen doping was used to improve the electrochemical performance of a CuO-NiO mixed oxide used as a glucose sensor. Characterization techniques were employed to analyze the material's morphology and properties, revealing that the developed sensor exhibited fast response time, high sensitivity, and excellent glucose selectivity.
In this study plasma-assisted nitrogen doping of a CuO-NiO mixed oxide thin film was presented. The as prepared film was also applied as a glucose sensor. The nitrogen species generated during plasma ignition resulted in a beneficial phase transformation of CuO to Cu2O. Characterisation techniques such as XRD, SEM, EIS and Hall Effect etc. measurements were utilized to study the morphology, structural features, doping profile and electrical properties of the sensing material. Device performance electrochemical testing showed that the as-developed sensor (labelled as N-CuO/Cu2O:NiO) showed an ultra-fast response time of 2.5 s with high sensitivity (1131 mu A/mM.cm(2)). The linear range of the sensor was calculated to be up to 2.74 mM of glucose and excellent selectivity towards glucose at an applied potential of +0.67 V vs Ag/AgCl in 0.1 M NaOH electrolyte solution. The limit of detection was calculated to be 20 mu M for the N-CuO/Cu2O:NiO sensor. The N-CuO/Cu2O:NiO have smaller Tafel slope compared to pristine CuO and CuO:NiO mixed oxides. Enhanced electrochemical performance of the N-CuO/Cu2O:NiO originates from the improved electronic properties of the thin film. (C) 2020 Elsevier B.V. All rights reserved.
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