TY - JOUR
T1 - Geometric design optimization of polyaniline/graphite nanocomposite based flexible humidity sensor for contactless sensing and breath monitoring
AU - Dutta, Achintya
AU - Nirmale, Aditya
AU - Nayak, Ramakrishna
AU - Selvakumar, M.
AU - Bhat, Somashekara
AU - Paramasivam, Selvaraj
AU - Senthil Kumar, S.
N1 - Funding Information:
Mr. Achintya Dutta is thankful to MAHE for the research grant (No. 00000317). The authors would also like to thank Mr. Aditya Gunturu for the graphical illustrations.
Publisher Copyright:
© 2022
PY - 2022/9/15
Y1 - 2022/9/15
N2 - We report a low cost flexible polyaniline-graphite nanocomposite based resistive type humidity sensor, screen printed on a PET substrate with interdigitated silver electrodes. The composite with a 3:1 ratio of polyaniline and graphite was found to be ideal with a sensing response of 93.4%, took 24 s to reach 54% RH, a maximum response/recovery time of 35/39 s and low hysteresis (1.12%). Graphite acting as the support material increased the sensor's thermal stability, allowing it to be operated at temperatures as high as 55 ⁰C. To further improve sensor performance and find an optimum device architecture, geometric parameters such as inter-electrode distance and number of electrodes were studied and optimised. Based on this, a relative humidity contactless finger sensor (1.5 cm range) and a human breath monitoring sensor to map different breathing rates were demonstrated.
AB - We report a low cost flexible polyaniline-graphite nanocomposite based resistive type humidity sensor, screen printed on a PET substrate with interdigitated silver electrodes. The composite with a 3:1 ratio of polyaniline and graphite was found to be ideal with a sensing response of 93.4%, took 24 s to reach 54% RH, a maximum response/recovery time of 35/39 s and low hysteresis (1.12%). Graphite acting as the support material increased the sensor's thermal stability, allowing it to be operated at temperatures as high as 55 ⁰C. To further improve sensor performance and find an optimum device architecture, geometric parameters such as inter-electrode distance and number of electrodes were studied and optimised. Based on this, a relative humidity contactless finger sensor (1.5 cm range) and a human breath monitoring sensor to map different breathing rates were demonstrated.
UR - http://www.scopus.com/inward/record.url?scp=85131457784&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85131457784&partnerID=8YFLogxK
U2 - 10.1016/j.matlet.2022.132577
DO - 10.1016/j.matlet.2022.132577
M3 - Article
AN - SCOPUS:85131457784
SN - 0167-577X
VL - 323
JO - Materials Letters
JF - Materials Letters
M1 - 132577
ER -