Journal
NANOTECHNOLOGY
Volume 32, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/abb973
Keywords
graphene; liquid phase exfoliation; humidity sensing; respiration monitoring
Funding
- Ministry of Education, Science and Technological Development of the Republic of Serbia [451-03-68/2020-14/200026]
- Institute of Physics Belgrade, through the Ministry of Education, Science, and Technological Development of the Republic of Serbia
- Science Fund of the Republic of Serbia, PROMIS [6057070]
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This work presents chemiresistive graphene-based humidity sensors that exhibit unique performance parameters, including resistance changes up to 10% with different humidity levels, linear response over a wide range of relative humidity levels (8% to 95%), weak sensitivity to other air constituents, flexibility, transparency of approximately 80%, and a fast response time of 30 ms. These sensors are suitable for applications in respiration monitoring and real-time finger proximity detection, particularly in flexible touchless interactive panels.
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 fast 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.
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