A Low-cost, Flexible Electrochemical Sensor for Nitrate Detection in Water

Riam, Shah Zayed; Islam, Md. Najmul; Inam, AKM Sarwar; Tabassum, Shawana

doi:10.1109/fleps57599.2023.10220399

Cited by 1 publication

(1 citation statement)

References 24 publications

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“…This polymer combination induces conducting behavior through the interplay of two distinct polymers: PEDOT, contributing electronic characteristics, and PSS, contributing ionic characteristics (13). PEDOT: PSS is readily available commercially, offering high conductivity and ease of processing (14). In the contemporary landscape, the prevalence of flexible electronic devices is witnessing a steady rise, finding applications in identification cards, wearable electronics, and various types of screens (15,16,17).…”

Section: Introductionmentioning

confidence: 99%

Flexible Organic Electrochemical Transistor Based on Conjugated Conducting Polymers

Riam,

Islam,

Sarker

et al. 2024

ECS Trans.

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In this work, we have fabricated a side-gated organic electrochemical transistor (OECT) where the source, drain, and gate terminals are screen-printed on a flexible polyethylene terephthalate substrate through a scalable screen-printing process. The semiconducting channel material is made of polyethylene dioxythiophene: polystyrene sulfonate (PEDOT: PSS), applied via spray coating. The OECT operates by volumetric gating of the channel through a gel electrolyte containing poly sodium 4-styrene sulfonate, transitioning highly conductive PEDOT+ to PEDOT0 through de-doping, biased by a positive gate voltage. Additionally, the OECT displayed a transconductance (gm) of 62.5 µA/V, mobility (µ) of 6.6×106 cm2 / Vs, and a threshold voltage (Vth) of -0.39 V, with the ON/OFF ratio being relatively low at 33.2. The repeatability was confirmed through the fabrication of three devices that exhibited nearly identical behavior. Future work emphasizes functionalizing the electrolyte to detect biomolecules such as glucose, pH, and ion species.

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