Flexible pH sensor based on a conductive PANI membrane for pH monitoring. Issue 1 (23rd December 2019)

• Record Type: Journal Article
• Authors: Li, Yongqian; Mao, Yunlong; Xiao, Chi; Xu, Xiaoli; Li, Xueyong
• Is Part Of: RSC advances. Volume 10:Issue 1(2020)
• Page Start: 21
• Page End: 28
• Publication Date: 2019-12-23
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra09188b
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A conductimetric flexible film pH sensor working in sensing materials of PANI membrane was developed for clinic wound monitoring. 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.