ArticleACS sensors2025
Fine-Tuning an ISFET-Based Dual pH-Total Alkalinity Sensor for Operation in Seawater Using an Adjustable, Suspended Anode.
Article in ACS sensors, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- High frequency in situ total alkalinity measurement for monitoring ocean alkalinity enhancement field trials.Communications engineering · 2026Article
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2 authors.
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Abstract
In this study, we present a re-envisioned design of an ion-sensitive field-effect transistor (ISFET)-based solid-state sensor for measuring pH and total alkalinity of seawater with electrolytically generated titrant. The original design requires either custom nanofabrication of ISFET wafers or back-end processing of fully fabricated ISFETs. Instead, we assembled all "off-the-shelf" parts to demonstrate the same measurement principle but with the titrant-generating electrode suspended orthogonal to the pH-sensing region of the ISFET rather than being physically deposited on the face of the chip. This offers many benefits including (1) avoiding disruption the pH functionality of the ISFET; (2) enabling the assessment of anode-gate distance sensitivity from a single ISFET; and (3) exploration of different electrode geometries and composition without complex ISFET fabrication. In this study, we analyzed the sensitivity of the A
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