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Nondestructive Monitoring of Graphene Conductivity using Electrical Impedance Tomography

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Abstract
The graphene film has a good potential structure to be used in the future electronic applications. It has a two-dimensional (2D) structure and also it has many excellent properties. The graphene is synthesized through chemical vapor deposition (CVD) process and then it is transferred to the other substrate surfaces. The different surfaces can create various properties of samples, which can lead to variation in its electronic structure, morphology, etc. Therefore, we need to measure the conductivity of the graphene film after sample fabrication. The commonly used methods for measuring conductivity are 4-point probe method, Van der pauw method, Raman spectroscopy, etc. This methods are destructive and only provide information of conductivity measurement across small area. There is a necessity for development of efficient non destructive methods for imaging of whole graphene sample. Electrical resistance tomography (ERT) is a simple, fast and non destructive method that can be used for the monitoring graphene sample. The ERT is an imaging modality in which the internal conductivity distribution is reconstructed based on the measuring voltage on the object surface. In this study, we present a simple method for large sample conductivity measurement of a graphene using ERT. The application of the ERT method has no limitation to the size of the graphene film for conductivity measurement. Electrical conductivity measurement of large size sample is possible and also defects can be investigated by using ERT method.
Author(s)
Sheik Abdur Rahman
Issued Date
2020
Awarded Date
2020. 2
Type
Dissertation
URI
http://dcoll.jejunu.ac.kr/common/orgView/000000009337
Affiliation
제주대학교 산업대학원
Department
산업대학원 전기공학과
Advisor
Kim, Woo Young
Table Of Contents
1. Introduction. 1
1.1 Scope of the Thesis 3
2. Literature Review 4
3. About Graphene 6
3.1 What is Graphene. 6
3.2 Application of Graphene 7
3.3 History of Graphene. 7
3.4 Graphene Properties. 8
3.4.1 Chemical Properties 8
3.4.2 Mechanical Properties. 8
3.4.3 Electronic Properties. 8
3.4.4 Thermal & Optical Properties. 9
3.5 Synthesis Technology of Graphene . 9
3.6 Sample Preparation of Graphene . 10
4. Introduction to ERT 11
4.1 Forward Problem . 12
4.2 Data Acquisition 14
4.3 Finite Element Method (FEM). 15
4.4 Iterative GaussNewton method 15
5. Conductivity Estimation of Graphene using ERT 16
5.1 Numerical results with Case-1 . 17
5.2 Numerical results with Case-2 . 18
6. Experimental Studies 19
6.1 Sample Preparation 19
6.2 Experimental Condition . 20
7. Experimental Result 21
7.1 Conductivity Estimation with Experimental Studies with Adjacent Method 21
7.2 Conductivity Estimation with Experimental Studies with Opposite Method 23
8. Future Works 25
9. Conclusions. 26
10. References. 27
Degree
Master
Publisher
제주대학교 산업대학원
Citation
Sheik Abdur Rahman. (2020). Nondestructive Monitoring of Graphene Conductivity using Electrical Impedance Tomography
Appears in Collections:
Graduate School of Industry > Electrical Engineering
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