Imperial College London
Alternate

ProfessorIainMcCulloch

Faculty of Natural Sciences, Department of Chemistry

Visiting Professor
 
 
 
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Contact

 

+44 (0)20 7594 5669i.mcculloch

 
 
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Location

 

Molecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Zhong:2023:10.1021/acsami.3c11214,
author = {Zhong, Y and Nayak, PD and Wustoni, S and Surgailis, J and Parrado, Agudelo JZ and Marks, A and McCulloch, I and Inal, S},
doi = {10.1021/acsami.3c11214},
journal = {ACS Appl Mater Interfaces},
title = {Ionic Liquid Gated Organic Electrochemical Transistors with Broadened Bandwidth.},
url = {http://dx.doi.org/10.1021/acsami.3c11214},
year = {2023}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The organic electrochemical transistor (OECT) is a biosignal transducer known for its high amplification but relatively slow operation. Here, we demonstrate that the use of an ionic liquid as the dielectric medium significantly improves the switching speed of a p-type enhancement-mode OECT, regardless of the gate electrode used. The OECT response time with the ionic liquid improves up to ca. 41-fold and 46-fold for the silver/silver chloride (Ag/AgCl) and gold (Au) gates, respectively, compared with devices gated with the phosphate buffered saline (PBS) solution. Notably, the transistor gain remains uncompromised, and its maximum is reached at lower voltages compared to those of PBS-gated devices with Ag/AgCl as the gate electrode. Through ultraviolet-visible spectroscopy and etching X-ray photoelectron spectroscopy characterizations, we reveal that the enhanced bandwidth is associated with the prediffused ionic liquid inside the polymer, leading to a higher doping level compared to PBS. Using the ionic liquid-gated OECTs, we successfully detect electrocardiography (ECG) signals, which exhibit a complete waveform with well-distinguished features and a stable signal baseline. By integrating nonaqueous electrolytes that enhance the device bandwidth, we unlock the potential of enhancement-mode OECTs for physiological signal acquisition and other real-time biosignal monitoring applications.
AU  - Zhong,Y
AU  - Nayak,PD
AU  - Wustoni,S
AU  - Surgailis,J
AU  - Parrado,Agudelo JZ
AU  - Marks,A
AU  - McCulloch,I
AU  - Inal,S
DO  - 10.1021/acsami.3c11214
PY  - 2023///
TI  - Ionic Liquid Gated Organic Electrochemical Transistors with Broadened Bandwidth.
T2  - ACS Appl Mater Interfaces
UR  - http://dx.doi.org/10.1021/acsami.3c11214
UR  - https://www.ncbi.nlm.nih.gov/pubmed/37997899
ER  -
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