Effects of graphene layer and gold nanoparticles on sensitivity of humidity sensors

dc.contributor.author Bao, Jiawei
dc.contributor.author Hashemi, Niloofar
dc.contributor.author Guo, Jingshuai
dc.contributor.author Hashemi, Nicole
dc.contributor.department Mechanical Engineering
dc.contributor.department Biomedical Sciences
dc.contributor.department Ames Laboratory
dc.contributor.department Bioeconomy Institute
dc.date.accessioned 2022-05-16T19:46:34Z
dc.date.available 2022-05-16T19:46:34Z
dc.date.issued 2020-03-25
dc.description.abstract Humidity sensors can be used to monitor body sweat. Here, we studied a humidity sensor that comprised of a graphene layer between two electrodes. The operating principle is that the humidity sensor will respond when vapor reaches the graphene layer from the top. Based on the humidity diffusion, the sensor measures the relative humidity (RH) with different response times. Graphene is a material with high diffusivity and small thickness that can increase the sensitivity of a sensor. Based on the micro electro mechanical systems (MEMS) method, we modeled the humidity sensor using COMSOL Multiphysics® transport of diluted species software. Additionally, we used the concentration values from the simulations to determine the relationship between capacitance and relative humidity. The sensitivity was found to be 3.379 × 10−11 pF/%RH for the 4-layer graphene, 1.210 × 10−14 pF/%RH for the 8-layer graphene, and 3.597 × 10−11 pF/%RH for the 16-layer graphene sensor. The sensitivity of 4-layer graphene with gold sensor is 3.872 × 10−13 pF/%RH which is smaller than 4-layer graphene sensor, and graphene with gold nanoparticles shows better response time than 4-layer graphene sensor.
dc.description.comments This is a manuscript of an article published as Bao, Jiawei, Niloofar Hashemi, Jingshuai Guo, and Nicole N. Hashemi. "Effects of graphene layer and gold nanoparticles on sensitivity of humidity sensors." Journal of Micromanufacturing 3, no. 1 (2020): 20-27. DOI: 10.1177%2F2516598419896130. Copyright 2020 The Authors. Reprinted by permission of SAGE Publications.
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/gwW7AGOw
dc.language.iso en
dc.publisher SAGE Publications
dc.source.uri https://doi.org/10.1177%2F2516598419896130 *
dc.subject.keywords Graphene humidity sensor
dc.subject.keywords COMSOL
dc.subject.keywords gold nanoparticles
dc.subject.keywords sensitivity
dc.title Effects of graphene layer and gold nanoparticles on sensitivity of humidity sensors
dc.type Article
dspace.entity.type Publication
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