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Ultrafast humidity sensor based on liquid phase exfoliated graphene

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2020
Authors
Andrić, Stevan
Tomašević-Ilić, Tijana
Bošković, Marko V.
Sarajlić, Milija
Vasiljević-Radović, Dana
Smiljanić, Milče M.
Spasenović, Marko
Article (Published version)
,
IOP Publishing Ltd.
Metadata
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Abstract
Humidity sensing is important to a variety of technologies and industries, ranging from environmental and industrial monitoring to medical applications. Although humidity sensors abound, few available solutions are thin, transparent, compatible with large-area sensor production and flexible, and almost none are fast enough to perform human respiration monitoring through breath detection or real-time finger proximity monitoring via skin humidity sensing. This work describes chemiresistive graphene-based humidity sensors produced in few steps with facile liquid phase exfoliation followed by Langmuir–Blodgett assembly that enables active areas of practically any size. The graphene sensors provide a unique mix of performance parameters, exhibiting resistance changes up to 10% with varying humidity, linear performance over relative humidity (RH) levels between 8% and 95%, weak response to other constituents of air, flexibility, transparency of nearly 80%, and response times of 30 ms. The fa...st response to humidity is shown to be useful for respiration monitoring and real-time finger proximity detection, with potential applications in flexible touchless interactive panels.

Keywords:
graphene / liquid phase exfoliation / humidity sensing / respiration monitoring
Source:
Nanotechnology, 2020, 32, 2, 025505-
Publisher:
  • IOP Publishing
Projects:
  • Micro- Nanosystems and Sensors for Electric Power and Process Industry and Environmental Protection (RS-32008)

DOI: 10.1088/1361-6528/abb973

ISSN: 0957-4484

PubMed: 32942262

WoS: 000577199100001

Scopus: 2-s2.0-85094219579
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URI
https://cer.ihtm.bg.ac.rs/handle/123456789/3993
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