Geometric design optimization of polyaniline/graphite nanocomposite based flexible humidity sensor for contactless sensing and breath monitoring

Achintya Dutta; Aditya Nirmale; Ramakrishna Nayak; M. Selvakumar; Somashekara Bhat; Selvaraj Paramasivam; S. Senthil Kumar

doi:10.1016/j.matlet.2022.132577

Geometric design optimization of polyaniline/graphite nanocomposite based flexible humidity sensor for contactless sensing and breath monitoring

Achintya Dutta
, Aditya Nirmale
, Ramakrishna Nayak
, M. Selvakumar^*
, Somashekara Bhat
, Selvaraj Paramasivam
, S. Senthil Kumar

^*Corresponding author for this work

Manipal Institute of Technology, Manipal

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

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.

Original language	English
Article number	132577
Journal	Materials Letters
Volume	323
DOIs	https://doi.org/10.1016/j.matlet.2022.132577
Publication status	Published - 15-09-2022

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.matlet.2022.132577

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title = "Geometric design optimization of polyaniline/graphite nanocomposite based flexible humidity sensor for contactless sensing and breath monitoring",

abstract = "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.",

author = "Achintya Dutta and Aditya Nirmale and Ramakrishna Nayak and M. Selvakumar and Somashekara Bhat and Selvaraj Paramasivam and \{Senthil Kumar\}, S.",

note = "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: {\textcopyright} 2022",

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doi = "10.1016/j.matlet.2022.132577",

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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.

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DO - 10.1016/j.matlet.2022.132577

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VL - 323

JO - Materials Letters

JF - Materials Letters

M1 - 132577

ER -

Geometric design optimization of polyaniline/graphite nanocomposite based flexible humidity sensor for contactless sensing and breath monitoring

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