Flexible pH sensor based on a conductive PANI membrane for pH monitoring |
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| Authors: | Yongqian Li Yunlong Mao Chi Xiao Xiaoli Xu Xueyong Li |
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| Affiliation: | Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518000 China.; Key Laboratory of Micro/Nano Systems for Aerospace of Ministry of Education, Northwestern Polytechnical University, Xi''an Shaanxi 710072 China ; Department of Burn and Plastic Surgery, Tangdu Hospital, Air Force University, Xi''an 710038 China, |
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| Abstract: | pH is a critical parameter used to specify the acidity or alkalinity of an aqueous solution in chemistry, food processing, and medical care. In this study, a conductimetric-type micro pH sensor has been achieved using PANI membrane fabricated on a flexible substrate film aiming to monitor wound healing. The sensor is based on the incorporation of a polyaniline (PANI) membrane, interdigital electrode, and polyimide (PI) substrate. PANI was doped with dodecyl benzene sulfonic acid (DBSA) to obtain good conductivity. The electrodes were patterned on the PI film by etching. The contact area between the PANI and interdigital electrodes improves the responsiveness of the pH sensor. A sensitivity of 58.57 mV per pH over the entire pH range from 5.45 to 8.62 was obtained experimentally, along with a superior repeatability of 8% FS (full scale) and a temperature drift of 6.8% FS. This micro flexible pH sensor aims to monitor the pH value of wound healing, which also facilitates the realization of online monitoring of the pH for telemedicine, food safety, and home health care.A conductimetric flexible film pH sensor working in sensing materials of PANI membrane was developed for clinic wound monitoring. |
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