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    Microneedle array sensors based on carbon nanoparticle composites: interfacial chemistry and electroanalytical properties

    Year: 2019

    Journal: J. Mater. Sci., Volume 54, AUG, page 10705–10714

    Authors: Hegarty, Catherine; McKillop, Stephen; McGlynn, Ruairi J.; Smith, Robert B.; Mathur, Ashish; Davis, James

    Organizations: European Union's INTERREG VA Programme; Department for the Economy (DfE) Northern Ireland; British Council (DST-UKIERI) [65/2017]; University of Central Lancashire Innovation and Enterprise

    Conductive microneedle patches consisting of carbon nanoparticles embedded in a polystyrene matrix have been prepared using micro-moulding techniques. The interfacial properties of the structures before and after electrochemical etching have been characterised using X-ray photoelectron spectroscopy and contact angle. Anodisation of the needles leads to a significant increase in oxygen functionality and is shown to dramatically improve the electroanalytical capabilities of the microneedle array. The detection of uric acid in horse blood was used as a model system through which to assess the performance of the system. The composite approach is shown to lead to viable carbon-based sensors and can offer a rapid prototype option for the development of tailored microneedle systems.
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