Composite Microneedle Arrays Modified With Palladium Nanoclusters forElectrocatalytic Detection of Peroxide

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The fabrication of conductive composite microneedle (MN) patches modified with palladium clusters for theelectrocatalytic detection of peroxide is described in this letter. Micromolding techniques are utilized in which carbonnanoparticles are bound within a polystyrene matrix resulting in the production of a 10×10 array of needles of length700μm. Electrochemical anodization of the carbon particles increases the interfacial carboxyl group population whichfacilitates the capture of Pd2+ions. Their subsequent electroreduction yields a catalytic interface with a high sensitivitytoward the electroreduction of peroxide (−0.3 V:49.7+/–2.8μA·mM–1·cm–2; –0.5 V:102.1+/–2.32μA·mM–1·cm–2). The MNsensing system and the various modification stages has been characterized using mechanical testing (fracture testing),cyclic voltammetry, and high-resolution X-ray photoelectron spectroscop
Original languageEnglish
Article number 4500904
Number of pages4
JournalIEEE Sensors Letters
Early online date21 Aug 2019
Publication statusPublished - 24 Sep 2019



  • microneedle
  • palladium
  • peroxide
  • sensor
  • electrode
  • composite

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