Title

Flexible and Transparent Ultrathin Gold Microelectrode Array for Electro-Optical Neural Interface

Alternative Title

전기광학형 신경 인터페이스를 위한 플렉서블 투명 얇은 금 박막 미세전극 어레이

DGIST Authors

Woongki Hong ; Hongki Kang ; Hyuk-Jun Kwon

Advisor

강홍기

Co-Advisor(s)

Hyuk-Jun Kwon

Issued Date

2021

Awarded Date

2021/02

Citation

Woongki Hong. (2021). Flexible and Transparent Ultrathin Gold Microelectrode Array for Electro-Optical Neural Interface. doi: 10.22677/thesis.200000362719

Type

Thesis

Subject

Flexible and Transparent electronics, Ultrathin Metal Nanofilm, Microelectrode Array, Electrophysiological Recording, Electro-Optical Neural Interface, 플렉서블 투명 전극, 얇은 금 박막 나노필름, 미세전극 어레이, 전기생리학적 레코딩, 전기 광학적 인터페이스

Table Of Contents

1. INTRODUCTION 1
1.1. Motivation 1
1.2. Neural Signal Interface 1
1.2.1. Invasive Neural Interface 2
1.2.2. Non-Invasive Neural Interface 2
1.3. Electrochemical Measurement 3
1.3.1. Electrochemical Impedance Spectroscopy 3
1.3.2. Two Electrode System 4
1.3.3. Double Layer Capacitance 5
1.3.4. Nyquist Plot 6
1.4. Flexible and Transparent Electronics 7
1.4.1. Conventional Flexible and Transparent Electrode 7
1.4.2. Ultrathin Metal Nanofilm 8
1.4.3. Layer-by-Layer coated Polyelectrolytes 9
1.4.4. Flexible Substrates 10
2. EXPERIMENTAL METHOD 11
2.1. Device Structure and Fabrication 11
2.1.1. Layer-by-Layer Polyelectrolytes Characterization 12
2.1.2. Ultrathin Gold Microelectrode Array 12
2.1.3. Bulk Gold Microelectrode Array 13
2.2. Electro-Optical Characterization 14
2.3. Mechanical Flexibility Test 15
2.4. Electrochemical Measurement 15
2.4.1. Modeling of Electrochemical Measurement 15
2.4.2. Experimental Setup 16
2.5. Biocompatibility Test 17
2.6. Simulation modeling of in vivo photothermal stimulation using thermo-plasmonic optical fiber 18
3. RESULT & DISCUSSION 20
3.1. Material Characteristics of Ultrathin Gold Microelectrode Array 20
3.2. Electrical and Optical Characteristics of Ultrathin Gold Microelectrodes 23
3.2.1. Optical Characteristics of Ultrathin Gold Electrode 23
3.2.2. Electrical Characteristics of Ultrathin Gold Microelectrode on Flexible Substrate 24
3.2.3. Mechanical Flexibility on Ultrathin Gold Microelectrodes 29
3.3. Electrochemical Impedance Spectroscopy (EIS) 29
3.4. Electrophysiological Measurements 34
3.4.1. Biocompatibility Test 34
3.4.2. RMS Noise 35
3.5. COMSOL Simulation 36
4. CONCLUSION 38
5. APPREDIX 39
A1. MATLAB Source Code for Power Spectrum Density (PSD) 39
A2. Electrochemical Impedance Measurement 40
A3. EIS spectrum Analysis 41
A4. Electrophysiological Measurements 42
A5. COMSOL Simulation Software 43

URI

http://dgist.dcollection.net/common/orgView/200000362719
http://hdl.handle.net/20.500.11750/16666

DOI

10.22677/thesis.200000362719

Degree

Master

Department

Information and Communication Engineering

Publisher

DGIST

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