Detachable Flexible ISFET‐Based pH Sensor Array with a Flexible Connector. (11th September 2020)

• Record Type: Journal Article
• Authors: Honda, Satoko; Shiomi, Mao; Yamaguchi, Takafumi; Fujita, Yusuke; Arie, Takayuki; Akita, Seiji; Takei, Kuniharu
• Is Part Of: Advanced Electronic Materials. Volume 6:Number 10(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-09-11
• Subjects: flexible connectors -- flexible sensors -- ISFETs -- pH sensors; Materials -- Electric properties -- Periodicals; Materials science -- Periodicals; Magnetic materials -- Periodicals; Electronic apparatus and appliances -- Periodicals; 537
• DOI: 10.1002/aelm.202000583
• Languages: English
• ISSNs: 2199-160X

Abstract

Abstract: Flexible sensors that can detect different types of stimuli simultaneously from any surface are attractive in many fields, including the Internet of Things. An important function of a flexible sensor sheet is multiple sensing without sacrificing mechanical flexibility, conformability, and device cost on the macroscale. This study proposes a macroscale detachable pH sensor array consisting of a disposable pH sensitive membrane sheet and a reusable flexible transistor array via a flexible electrical connector. Mechanical flexibility and stable electrical connection are realized by a soft Ag electrode and sticky polydimethylsiloxane/polyethylenimine layer for the connector. After laminating the two sheets, a fundamental study reveals a sensitivity of about 66.5 mV per pH. Although a small potential change in the pH membrane is observed as the temperature changes, the pH value can be monitored using the detachable flexible transistor‐based pH sensor sheet with a sufficient resolution. As a proof‐of‐concept for solution diffusion monitoring using the pH change, a 5 × 5 array sensor sheet is successfully demonstrated. The sensor array can measure the pH distribution with a different pH diffuses into a solution bath within a few seconds. Abstract : A flexible pH sensor array to monitor solution distribution and diffusion by detecting pH level is presented. For an economical and macroscale pH sensor array sheet, a detachable two sheet structure consisting of a disposable sheet and a reusable sheet are demonstrated by integrating a flexible electrical connector between the two sheets as a new device platform.