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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.