Low-cost fabrication of a pH sensor based on writing directly over parchment-type paper with pencil

Al-Hardan, Naif H. and Hamid, Muhammad Azmi Abdul and Keng, Lim Kar and AL-Khalqi, Ensaf Mohammed and Jalar, Azman and Chiu, Wee Siong (2021) Low-cost fabrication of a pH sensor based on writing directly over parchment-type paper with pencil. Journal of Materials Science: Materials in Electronics, 32 (7). pp. 9431-9439. ISSN 0957-4522, DOI https://doi.org/10.1007/s10854-021-05607-0.

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Abstract

Herein, we introduce a low-cost and straightforward method for preparing pH sensors based on parchment-type paper and pencil traces as a base and electrode, respectively. The hydrophobic feature of the parchment paper supports the relatively long life of the proposed pH sensor. The results indicate that the present sensors have a Nernstian response with a Nernstian slope of 52.1 +/- 1.5 mV/pH and a good linearity of 0.995 from pH 4 to 10. The stability of the proposed electrode is approximately 0.75 mV/h. The prepared electrodes show a relatively long operating life compared with the published results of ordinary paper-based pH devices. However, the Nernstian factor decreases over time and stabilizes at approximately 28 mV/pH after two months. This approach provides a low-cost and reproducible pH sensor.

Item Type: Article
Funders: Universiti Kebangsaan Malaysia (UKM) [GGPM-2020-047]
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Ms Zaharah Ramly
Date Deposited: 08 Aug 2022 06:47
Last Modified: 08 Aug 2022 06:47
URI: http://eprints.um.edu.my/id/eprint/28431

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