Multifunctional Transparent Conductive Flexible Sensor Based on Graphene/Polyaniline/ Graphene Sandwich Composite on PDMS Substrate

A novel and simplified method is introduced for synthesizing a transparent sensor based on graphene-polydimethylsiloxane (PDMS). The chemical vapor deposition (CVD)-grown single-layer graphene on the PDMS substrate suffers from low conductivity due to defects at grain boundaries. The fabricated sens...

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Bibliographic Details
Published in:IEEE sensors journal 2024-08, Vol.24 (16), p.25328-25336
Main Authors: Kumar Sharma, Atul, Kumar Sharma, Anup, Sharma, Ritu, Sharma, Puneet, Singh, Surbhi
Format: Article
Language:English
Subjects:
Chemical sensors
Chemical synthesis
Chemical vapor deposition
Conductivity
Copper
Crystal defects
Fingers
Flexible components
Flexible transparent sensor
Grain boundaries
Graphene
graphene-polyaniline (PANI)–graphene (G-P–G) sandwich
human limb motion detection
Human motion
Low conductivity
Motion perception
NADI signal detection
Plastics
Polyanilines
Polydimethylsiloxane
Sandwich structures
Sensors
strain sensor
Substrates
Wrist
wrist pulse measurement
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Summary:A novel and simplified method is introduced for synthesizing a transparent sensor based on graphene-polydimethylsiloxane (PDMS). The chemical vapor deposition (CVD)-grown single-layer graphene on the PDMS substrate suffers from low conductivity due to defects at grain boundaries. The fabricated sensor incorporates a polyaniline (PANI) layer between two graphene layers to maintain enhanced conductivity even when subjected to strain, due to its flexibility. The tri-layer structure of graphene-PANI-graphene (G-P-G) achieves approximately 90% transmittance and a lower sheet resistance ( \approx 84~\Omega /Sq) on a flexible substrate that surpasses those achieved with a single-layer graphene on PDMS and other sandwich structures on a PDMS substrate. The developed transparent and highly conductive G-P-G sensor exhibits effective sensing for finger tapping/touch, strain detection, human motion detection, wrist pulse detection, breathing detection, and traditional NADI detection. This underscores its versatility for various sensing applications. In summary, the demonstrated results indicate the potential of this single transparent conductive sensor structure for deployment in diverse and multifunctional sensing applications.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2024.3418851