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Fabrication of Shape-Controlled Graphenes Based on Top-down and Bottom-up Approaches and Their Applications : 하향식/상향식 접근방법을 통한 형태 조절된 그래핀의 제조 및 응용
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | 장정식 | - |
dc.contributor.author | 홍진용 | - |
dc.date.accessioned | 2017-07-13T08:33:42Z | - |
dc.date.available | 2017-07-13T08:33:42Z | - |
dc.date.issued | 2013-02 | - |
dc.identifier.other | 000000009212 | - |
dc.identifier.uri | https://hdl.handle.net/10371/119656 | - |
dc.description | 학위논문 (박사)-- 서울대학교 대학원 : 화학생물공학부, 2013. 2. 장정식. | - |
dc.description.abstract | Graphene, typically composed of one-atom-thick layer of carbon in a 2D hexagonal lattice, is a basic building block for graphitic materials of all other dimensionalities. The graphene has attracted tremendous worldwide attention because of their fascinating properties different from those of the carbon-based graphitic materials (e.g., extremely high charge carrier mobility, large specific surface area, thermal/electrical conductivity, and chemical/mechanical stability). Up to date, various synthetic methods for preparing graphene have been developed. However, most previous synthetic methods suffer from the precise control of the size, shape, edge, layer of graphene sheets. Consequently, it is still challenging to produce graphene with tailored morphology and diameters for various applications. This dissertation describes the two different ways in the synthetic methodology of graphene will be presented in the viewpoint of top-down approach and bottom-up approach. As a top-down approach, the graphene sheets with well-defined shape are successfully fabricated using a simple oxidation and exfoliation process of high-crystalline carbon nanofibers (CNFs). Interestingly, the diameter and shape of the graphene sheets can be controlled by selectively designing the morphology of starting materials and optimizing the cutting method. As a bottom-up approach, graphene sheets are formed using layer-by-layer (LbL) self-assembly approach with a metallic dopant. The LbL approach is used to form poly(allylamine)(PAA)/poly(styrenesulfonate) (PSS) multilayer on a quartz substrate. During the carbonization process, the PSS layers can be transformed into graphene sheets due to its inherent aromatic and highly ordered structure. PAA layers served to protect the structural layers as well as prevent the agglomeration of graphene sheets. Most, importantly, these novel approaches can be used as an alternative tool for fabrication of various carbon-based nanomaterials with rational nanostructure design and may offer an opportunity for the further investigation of industrial applications, and might be expanded to allow the applications of graphene sheets in a wide range of areas (e.g., Transparent electrode, dipole antenna, acoustic actuator, nucleating agent, nano-filler, electro-responsive materials, and so on.). | - |
dc.description.tableofcontents | ABSTRACT i
List of Abbreviations iii List of Figures vii List of Tables xix Table of Contens xx 1. INTRODUCTION 1 1.1. Background 1 1.1.1. Graphene 1 1.1.2. Synthesis of graphene 4 1.1.2.1. Exfoliation 5 1.1.2.2. Epitaxy on silicon carbide 8 1.1.2.3. Chemical vapor deposition 9 1.1.2.4. Chemical synthesis 12 1.1.3. Application fields 14 1.1.3.1. Electrode 15 1.1.3.2. Transistor 18 1.1.3.3. Chem/Bio sensor 21 1.1.3.4. Supercapacitor 24 1.2. Objectives and Outline of the Study 27 1.2.1. Objectives 27 1.2.2. Outline 27 2. EXPERIMENTAL DETAILS 32 2.1. Top-down Approach for Fabricating Uniform Graphene Sheets with Disc Shape 32 2.1.1. Preparation of graphitized carbon nanofibers 32 2.1.2. Transversal cutting of graphitized carbon nanofibers 32 2.1.3. Mechanical reduction of oxidized graphene sheets 33 2.2. Bottom-up Approach for Fabricating Single Layer Graphene Sheets based on a Layer-by-Layer Self- assembly 35 2.2.1. Preparation of poly(allylamine)/poly (styrenesulfonate) (PAA/PSS) multi-layer using layer-by-layer self-assembly 35 2.2.2. Carbonization of PSS/PAA multi-layer and oxidation/reduction of graphene sheets 37 2.3. Applications 39 2.3.1. Foldable graphene electrode using ink-jet printing method 39 2.3.2. Graphene patterning via ink-jet printing method and their application to wideband dipole-antenna 41 2.3.3. Flexible & transparent graphene electrode as an acoustic actuator using inkjet printing 45 2.3.4. Electrorheological properties of graphene suspensions with improved sedimentation stability 48 3. RESULTS AND DISCUSSION 51 3.1. Top-down Approach for Fabricating Uniform Graphene Sheets with Disc Shape 51 3.1.1. Preparation of graphitized carbon nanofibers 51 3.1.2. Transversal cutting of graphitized carbon nanofibers 54 3.1.3. Mechanical reduction of oxidized graphene sheets 65 3.2. Bottom-up Approach for Fabricating Single Layer Graphene Sheets based on a Layer-by-Layer Self-assembly 82 3.2.1. Preparation of poly(allylamine)/poly (styrenesulfonate) (PAA/PSS) multi-layer using layer-by-layer self-assembly 82 3.2.2. Carbonization of PSS/PAA multi-layer and oxidation/reduction of graphene sheets 86 3.3. Applications 97 3.3.1. Foldable graphene electrode using ink-jet printing method 97 3.3.2. Graphene patterning via ink-jet printing method and their application to wideband dipole-antenna 107 3.3.3. Flexible & transparent graphene electrode as an acoustic actuator using inkjet printing 121 3.3.4. Electrorheological properties of graphene suspensions with improved sedimentation stability 136 4. CONCLUSIONS 154 REFERENCES 158 국문초록 171 | - |
dc.format | application/pdf | - |
dc.format.extent | 7084328 bytes | - |
dc.format.medium | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 대학원 | - |
dc.subject | Carbon nanomaterials | - |
dc.subject | Graphene | - |
dc.subject | Synthetic methodology | - |
dc.subject | Top-down | - |
dc.subject | Bottom-up | - |
dc.subject | Transparent electrode | - |
dc.subject | Electrorheological fluid | - |
dc.subject.ddc | 660 | - |
dc.title | Fabrication of Shape-Controlled Graphenes Based on Top-down and Bottom-up Approaches and Their Applications | - |
dc.title.alternative | 하향식/상향식 접근방법을 통한 형태 조절된 그래핀의 제조 및 응용 | - |
dc.type | Thesis | - |
dc.contributor.AlternativeAuthor | Jin–Yong Hong | - |
dc.description.degree | Doctor | - |
dc.citation.pages | xxiii, 175 | - |
dc.contributor.affiliation | 공과대학 화학생물공학부 | - |
dc.date.awarded | 2013-02 | - |
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