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Spike-Stimulated Dendritic Networks with Interparticle Quantum Tunneling for Ultrasensitive, Transparent and Flexible Piezoresistive Pressure Sensor

Title
Spike-Stimulated Dendritic Networks with Interparticle Quantum Tunneling for Ultrasensitive, Transparent and Flexible Piezoresistive Pressure Sensor
Translated Title
초고민감, 투과성, 유연성 압전저항 방식의 압력센서를 위한 입자간 양자터널링 기반의 스파이크로 자극된 수지상 네트워크
Authors
Jiwoo Gu
DGIST Authors
Jiwoo Gu; Youngu LeeSohee Kim
Advisor(s)
이윤구
Co-Advisor(s)
Sohee Kim
Issue Date
2021
Available Date
2022-07-07
Degree Date
2021/02
Type
Thesis
Keywords
gold nanostar, silver fractal dendrite, interparticle quantum electron tunneling, ultrasensitive and flexible piezoresistive pressure sensor, 금 나노입자, 은 프랙탈 수지상, 강화된 입자간 양자터널링, 유연 및 투명압력센서
Abstract
Mechano-electrical signal transductions based on interparticle quantum tunneling in polymer matrix composite system are widely used in various fields of biomedical healthcare monitoring, energy converting electronics, wearable devices, and human-machine interfaces due to the enormous potentials, enabling to realize integrated sensing electronic system. Piezoresistive type pressure sensors can be upmost candidates as befitting components for mechanical sensing devices thanks to the feasible merits. However, existing strategies for the formation of percolative signal transductions which are composed of non-featured electroactive particles have shown low sensitivity, membrane rigidity, and opaque device in despite of the fact that piezoresistive pressure sensors act as the key sensitizer layer in sensing system. Here, we demonstrate synergistically combined spike-stimulated dendritic networks leading to the sig- nificantly reinforced-quantum electron tunneling effect between interparticle microchannels on geometrically dendritic surface. Polymer-based composite layer composed of electroactive metal particles and elastomeric matrix shows standout capability to transport electrical distribution and signal transduction from the dynamic external stimuli into digital signal driving multifunctional device performance on the human skin and display touch screen. Our approach provides a remarkable improvements in sensing performance and operation stability such as ultrahigh sensitivity (160.3 kPa-1), device flexibility, and even high optical transparency (75.4 T%, 100). In addition, the flexible and transparent PU composite layers were demonstrated as a multifunctional pressure sensor for signal detection of the physical movement of the skin and a transparent touch panel with flexibility, mechanical/chemical stability (> 30000 cycles), and short response/recovery time (< 21 ms).
Table Of Contents
I. Introduction 1 1.1 Emerging fields of soft electronics 1 1.1.1 Soft electronics for integrated sensing component 4 1.1.2 Piezoresistive pressure sensor in flexible electronic applications 5 1.2 Design nanomaterials for multifunctional sensing device 9 1.2.1 Novel active materials 1. Gold Nanostar 10 1.2.2 Novel active materials 2. Siliver Fractal Dendrite 11 1.2.3 Spike-stimulated Dendritic Networks (SDN) in polyurethane 12 II. Theoretical Background 14 2.1 Mechano-electrical signal transduction 14 2.1.1 Piezoresistive effects based on quantum electron tunneling 14 2.1.2 Neuro-mimetic percolative conducting microchannels 18 2.2 Active materials for piezoresistive type pressure sensor 19 2.2.1 (In)organic nanomaterials and conducting polymers 21 2.2.2 Polymeric composite for elastomeric matrix 21 2.3 Multifunctional nanocomposite film for practical applications 22 2.3.1 1 Mechanical, electrical, and optical properties of SDN-based composites 22 2.3.2 Flexible and transparent pressure sensor 23 III. Experimental section 24 3.1 Chemicals and materials 24 3.2 Synthetic method of electroactive fillers 24 3.3 Fabrication of SDN-based piezoresistive pressure sensor 26 3.4 Characterizations of the piezoresistive pressure sensor 28 3.5 Mechano-electrical measurement and device characteristics 29 3.6 Biomedical and optoelectrical applications 30 IV. Results and Discussion 32 4.1 Enhanced-quantum electron tunneling effect (QTE) 32 4.1.1 Optical and geometrical characteristics for SDN 34 4.1.2 3D finite element analysis of pressure sensor 38 4.1.3 Mechano-response behavior of nanocomposite film 39 4.2 SDN-based piezoresistive pressure sensor 49 4.2.1 Piezoresistive sensing performance 49 4.2.2 Electrochemical impedance analysis 53 4.2.3 Applicability for multifunctional pressure sensor 56 4.2.4 Mechanical and enviornmental stability 59 V. Applications and Demonstration 61 5.1 Biomedical applications for physiological signal processing 61 5.2 Force touch panel for transparent display 63 VI. Conclusion 66 References 67 Summary (in Korean) 73
URI
http://dgist.dcollection.net/common/orgView/200000361620
http://hdl.handle.net/20.500.11750/16642
DOI
10.22677/thesis.200000361620
Degree
Master
Department
Energy Science & Engineering
University
DGIST
Related Researcher
  • Author Kim, Sohee Neural Interfaces & MicroSystems Lab
  • Research Interests Neural interface; Brain interface; Bio MEMS; Soft MEMS; Stretchable electronics; Zebrafish electrophysiology
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Collection:
Department of Energy Science and EngineeringThesesMaster


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