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Oxidation of copper electrodes on flexible polyimide substrates for non-enzymatic glucose sensing

Liu, Shijia; Ay, Ayse; Luo, Qiaochu; Hu, Xiangqi; Białas, Katarzyna; Dutta, Gorachand; Moschou, Despina; (2022) Oxidation of copper electrodes on flexible polyimide substrates for non-enzymatic glucose sensing. Materials Research Express , 9 (4) , Article 045010. 10.1088/2053-1591/ac656f. Green open access

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Abstract

The integration of non-enzymatic glucose sensing entities into device designs compatible with industrial production is crucial for the broad take-up of non-invasive glucose sensors. Copper and its oxides have proven to be promising candidates for electrochemical glucose sensing. They can be fabricated in situ enabling integration with standard copper metallisation schemes for example in printed circuit boards (PCBs). Here, copper oxide electrodes are prepared on flexible polyimide substrates through direct annealing of patterned electrode structures. Both annealing temperature and duration are tuned to optimise the sensor surface for optimum glucose detection. A combination of microscopy and spectroscopy techniques is used to follow changes to the surface morphology and chemistry under the varying annealing conditions. The observed physico-chemical electrode characteristics are directly compared with electrochemical testing of the sensing performance, including chronoamperommetry and interference experiments. A clear influence of both aspects on the sensing behaviour is observed and an anneal at 250 °C for 8 h is identified as the best compromise between sensor performance and low interference from competing analytes.

Type: Article
Title: Oxidation of copper electrodes on flexible polyimide substrates for non-enzymatic glucose sensing
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/2053-1591/ac656f
Publisher version: https://doi.org/10.1088/2053-1591/ac656f
Language: English
Additional information: Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence (http://creativecommons.org/licenses/by/4.0). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10148191
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