Dr. Liam T. Wilson Profile

Dr. Liam T. Wilson

at Univ of Glasgow

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Proceedings Article | 6 March 2023 Presentation + Paper

Optical tastebuds for water quality testing

Justin Sperling, Laurie Savage, Liam Wilson, Calum Cuthill, Katie McGuire, Jill Robbie, William Sloan, Caroline Gauchotte-Lindsay, William Peveler, Alasdair Clark

Proceedings Volume 12372, 123720M (2023) https://doi.org/10.1117/12.2647396

KEYWORDS: Water, Sensors, Principal component analysis, Plasmonics, Water quality, Statistical analysis, Mixtures, Environmental sensing

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To achieve the UN Sustainable Development Goal of universal access to clean water and sanitation, we need to rethink centralized water systems with global net-zero carbon and sustainability in mind. One approach is to develop scalable off-grid systems that are reliable and easy to use and maintain. A major challenge for such systems is translating the standard laboratory-based monitoring of centralized systems to a more sustainable and scalable model for regularly and routinely monitoring system outputs, which consist of complex mixtures with varying concentrations of molecules and ions in water. Here, we demonstrate a preliminary sensor that, once fully developed, could allow for point-of-use measurements with a single output to monitor. Rather than developing multiple sensors to monitor the levels of each individual component in the water, our label-free, array-based design mimics the biological system of taste. The sensor is comprised of an array of nano-tastebuds made of tailored plasmonic metasurfaces. The combination of different signals from each nano-tastebud to the same sample yields a unique fingerprint for that sample. Through training, these fingerprints build an identification model. By integrating a fully developed sensor into decentralized water systems, we seek to provide non-expert end-users with an easy-to-read output capable of warning of imminent system failures.

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