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Updated: Feb 11, 2026

Hollow Microneedle-based Sensor for Multiplexed Transdermal Electrochemical Sensing
Published on: June 1, 2012
Adsorption-Mediated Electrochemical Sensing of Halides
Richard Michalitsch1, Paul E Laibinis1
1Department of Chemical Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue, Cambridge, MA 02139 (USA) Fax: (+1) 617-258-5042.
Abstract:
A new strategy for detecting halides is presented that employs gold electrodes plated to expose a monolayer of silver atoms. Cl- , Br- , and I- ions each adsorb onto this surface and stochastically produce electrochemical changes (see picture; upd=underpotentially deposited) in the stripping characteristic of the silver layer that reflect the identity and surface coverage of these halides. The latter provides measurements that relate to the solution concentrations of the halides.
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