Microporous Polypyrrole‐Coated Graphene Foam for High‐Performance Multifunctional Sensors and Flexible Supercapacitors. (22nd June 2018)

• Record Type: Journal Article
• Authors: Park, Heun; Kim, Jung Wook; Hong, Soo Yeong; Lee, Geumbee; Kim, Dong Sik; Oh, Ju hyun; Jin, Sang Woo; Jeong, Yu Ra; Oh, Seung Yun; Yun, Jun Yeong; Ha, Jeong Sook
• Is Part Of: Advanced functional materials. Volume 28:Number 33(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-06-22
• Subjects: integrated system -- multifunctional sensors -- polypyrrole‐coated graphene foam -- supercapacitors -- wireless powering; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201707013
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: This study reports on the fabrication of pressure/temperature/strain sensors and all‐solid‐state flexible supercapacitors using only polydimethylsiloxane coated microporous polypyrrole/graphene foam composite (PDMS/PPy/GF) as a common material. A dual‐mode sensor is designed with PDMS/PPy/GF, which measures pressure and temperature with the changes of current and voltage, respectively, without interference to each other. The fabricated dual‐mode sensor shows high sensitivity, fast response/recovery, and high durability during 10 000 cycles of pressure loading. The pressure is estimated using the thermoelectric voltage induced by simultaneous increase in temperature caused by a finger touch on the sensor. Additionally, a resistor‐type strain sensor fabricated using the same PDMS/PPy/GF could detect the strain up to 50%. Flexible, high performance supercapacitor used as a power supply is fabricated with electrodes of PPy/GF for its high surface area and pseudocapacitance. Furthermore, an integrated system of such fabricated multifunctional sensors and a supercapacitor on a skin‐attachable flexible substrate using liquid–metal interconnections operates well, whereas sensors are driven by the power of the supercapacitor. This study clearly demonstrates that the appropriate choice of a single functional material enables fabrication of active multifunctional sensors for pressure, temperature, and strain, as well as the supercapacitor, that could be used in wirelessly powered wearable devices. Abstract : High‐performance solid‐state supercapacitors and multifunctional sensors sensitive to pressure, temperature, and strain are fabricated using a single common active material of microporous polydimethylsiloxane coated microporous polypyrrole/graphene foam composite. Furthermore, these sensors could be wirelessly driven with the integrated supercapacitors on a single flexible and skin‐attachable substrate.