title: A Sensor Array Using Multi-functional Field-effect Transistors with Ultrahigh Sensitivity and Precision for Bio-monitoring.
abstract: Mechanically adaptive electronic skins (e-skins) emulate tactition and thermoception by cutaneous mechanoreceptors and thermoreceptors in human skin, respectively. When exposed to multiple stimuli including mechanical and thermal stimuli, discerning and quantifying precise sensing signals from sensors embedded in e-skins are critical. In addition, different detection modes for mechanical stimuli, rapidly adapting (RA) and slowly adapting (SA) mechanoreceptors in human skin are simultaneously required. Herein, we demonstrate the fabrication of a highly sensitive, pressure-responsive organic field-effect transistor (OFET) array enabling both RA- and SA- mode detection by adopting easily deformable, mechano-electrically coupled, microstructured ferroelectric gate dielectrics and an organic semiconductor channel. We also demonstrate that the OFET array can separate out thermal stimuli for thermoreception during quantification of SA-type static pressure, by decoupling the input signals of pressure and temperature. Specifically, we adopt piezoelectric-pyroelectric coupling of highly crystalline, microstructured poly(vinylidene fluoride-trifluoroethylene) gate dielectric in OFETs with stimuli to allow monitoring of RA- and SA-mode responses to dynamic and static forcing conditions, respectively. This approach enables us to apply the sensor array to e-skins for bio-monitoring of humans and robotics.
authors.affiliation: School of Advanced Materials Science &Engineering, Sungkyunkwan University, Suwon, Kyunggi-do 440-746, Republic of Korea.
authors.forename: Do-Il
authors.initials: DI
authors.lastname: Kim
authors.affiliation: School of Advanced Materials Science &Engineering, Sungkyunkwan University, Suwon, Kyunggi-do 440-746, Republic of Korea.
authors.forename: Tran Quang
authors.initials: TQ
authors.lastname: Trung
authors.affiliation: School of Advanced Materials Science &Engineering, Sungkyunkwan University, Suwon, Kyunggi-do 440-746, Republic of Korea.
authors.forename: Byeong-Ung
authors.initials: BU
authors.lastname: Hwang
authors.affiliation: SKKU Advanced Institute of Nano Technology (SAINT), Sungkyunkwan University, Suwon, Kyunggi-do 440-746, Republic of Korea.
authors.forename: Jin-Su
authors.initials: JS
authors.lastname: Kim
authors.affiliation: Department of Applied Physics, Korea University, Sejongro 2511, Sejong 339-700, Korea.
authors.forename: Sanghun
authors.initials: S
authors.lastname: Jeon
authors.affiliation: Samsung Advanced Institute of Technology, Samsung Electronics Corporation, Yongin, Kyunggi-do 446-712, Republic of Korea.
authors.forename: Jihyun
authors.initials: J
authors.lastname: Bae
authors.affiliation: School of Polymer Science &Engineering, Chonnam National University, Gwangju 500-757, Korea.
authors.forename: Jong-Jin
authors.initials: JJ
authors.lastname: Park
authors.affiliation: 1] School of Advanced Materials Science &Engineering, Sungkyunkwan University, Suwon, Kyunggi-do 440-746, Republic of Korea [2] SKKU Advanced Institute of Nano Technology (SAINT), Sungkyunkwan University, Suwon, Kyunggi-do 440-746, Republic of Korea.
authors.forename: Nae-Eung
authors.initials: NE
authors.lastname: Lee
mesh_terms: D006801:Humans; D008991:Monitoring, Physiologic / Q000295:instrumentation* / Q000379:methods*; D012680:Sensitivity and Specificity; D012881:Skin Temperature