Abstract

Electrochemical sensor signal output, when recorded as a current, is primarily related to the target analyte concentration, but often also related to additional experimental or control parameters. When employing photo-active semiconductor electrodes, light intensity offers an additional control parameter for sensors and opportunities for new reaction/detection or signal amplification pathways. Light stimulation can (i) excite charge carriers to directly interact with analyte, (ii) excite charge carriers to interact with the analyte via a receptor, (iii) provide excited state solution intermediates to generate secondary analyte molecules, (iv) consume the target analyte to give a negative photoelectrochemical signal, or (v) be used to modify or amplify the sensor response. Light activated sensors have been reported for multiplexed arrays. In this perspective, recent developments in photoelectrochemical sensing methods based on semiconductor materials are summarised and new directions and opportunities are highlighted.
Original languageEnglish
Article number116154
JournalTrac - Trends in Analytical Chemistry
Volume135
Early online date17 Dec 2020
DOIs
Publication statusPublished - 28 Feb 2021

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