ArticleSensors (Basel, Switzerland)2020
Two-Channel Graphene pH Sensor Using Semi-Ionic Fluorinated Graphene Reference Electrode.
Article in Sensors (Basel, Switzerland), 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed.
- pH monitoring in high ionic concentration environments: performance study of graphene-based sensors.Analytical sciences : the international journal of the Japan Society for Analytical Chemistry · 2025Article
- Graphene Pseudoreference Electrode for the Development of a Practical Paper-Based Electrochemical Heavy Metal Sensor.ACS omega · 2024Article
- Two-Dimensional Disposable Graphene Sensor to Detect NaNanomaterials (Basel, Switzerland) · 2021Article
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6 authors.
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Abstract
A reference electrode is necessary for the working of ion-sensitive field-effect transistor (ISFET)-type sensors in electrolyte solutions. The Ag/AgCl electrode is normally used as a reference electrode. However, the Ag/AgCl reference electrode limits the advantages of the ISFET sensor. In this work, we fabricated a two-channel graphene solution gate field-effect transistor (G-SGFET) to detect pH without an Ag/AgCl reference electrode in the electrolyte solution. One channel is the sensing channel for detecting the pH and the other channel is the reference channel that serves as the reference electrode. The sensing channel was oxygenated, and the reference channel was fluorinated partially. Both the channels were directly exposed to the electrolyte solution without sensing membranes or passivation layers. The transfer characteristics of the two-channel G-SGFET showed ambipolar field-effect transistor (FET) behavior (p-channel and n-channel), which is a typical characteristic curve for the graphene ISFET, and the value of V
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