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Novel Synthesis of Copper Nanowires and Hybrid Nanocomposites with Carbon for Functional Electrodes
기능성 전극을 위한 구리 나노선과 탄소 복합체 물질의 합성 연구

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dc.contributor.advisor김연상-
dc.contributor.author윤진성-
dc.date.accessioned2018-05-28T16:54:05Z-
dc.date.available2018-05-28T16:54:05Z-
dc.date.issued2018-02-
dc.identifier.other000000149402-
dc.identifier.urihttps://hdl.handle.net/10371/140974-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 융합과학기술대학원 융합과학부, 2018. 2. 김연상.-
dc.description.abstractAs a new type of promising conductive nanomaterials, copper nanowire (Cu NW) and their nanocomposites have been widely investigated for various functional conductive electrodes, due to their solution-process ability, low cost, high conductivity and excellent flexibility. Compared with general nano-shapes, such as sphere, cube and plate, the Cu NWs have many unique properties, because of their unique one dimensional structure with a high aspect ratio. In this work, our research has primarily focused on the Cu NWs and their nanocomposites synthesis with shape control and special electrode applications for next generational electronics.
Firstly, a whole manufacturing process of the curved Cu NWs (CCNs) based flexible transparent conductive electrode (FTCE) with all solution process was introduced as an alternative for Indium tin oxide (ITO), due to their excellent opto-electrical property and flexibility. Although a traditional transparent electrode of ITO has an outstanding opto-electrical performance, as a ceramic material, the brittleness is a critical limitation to apply for various flexible devices. Interestingly, the highly purity and good quality CCNs are designed and synthesized by a binary polyol co-reduction method. In addition, a meniscus-dragging deposition method is used to uniformly coat the well-dispersed CCNs on the glass or polyethylene terephthalate (PET) substrate with vacuum-free and transfer-free conditions. Furthermore, networking of the CCNs was achieved by a solvent-dipped annealing method to fabricate the FTCE at the low temperature of 50 °C. The CCNs thin film on PET substrate exhibited high transparency (86.62% at 550 nm), low sheet resistance (99.14 Ω·□–1), and excellent flexibility and durability (R/R0 < 1.05 at 2000 bending, 5 mm of bending radius).
Secondly, we introduce an all-solution fabrication of the CCNs-based FTCEs utilizing a combination of self-designed innovative techniques, such as multi-polyol synthetic method, meniscus-dragging deposition method, polyurethane (PU)-stamped patterning method, solvent-dipped welding method and PU-embedded transfer method. These suggested methods effectively solved the technical problems of the high-cost fabrication, the low robustness, the high roughness and the difficulty of patterning. As a result, the CCNs thin film partially embedded into PU matrix exhibited excellent opto-electrical performance (Rs = 53.48 Ω·□–1 at T = 85.71%) and high mechanical stabilities (R/R0 < 1.02 at 1,000th bending and R/R0 < 1.10 at 10th tape peeling) with low surface roughness (Rrms = 14.36 nm).
Thirdly, the reduced graphene oxide (RGO) nanosheets bridging oriented copper NWs were introduced for flexible, annealing-free and air-stable electrode. The RGO nanosheets connecting the Cu NWs not only provided conductive pathways for electron transfer but also acted as a protective layer of oxidation on contact points. As a result, the composite film exhibits a low sheet resistance (0.808 Ω·□–1) and high flexibility (1,000th bending) without considerable change over 30 days. Furthermore, the Cu NW-RGO composites can be filtered on polyester cloth as a lightweight wearable conductor with high durability and simple process-ability, which are highly promising in kinds of electronic devices.
Finally, the novel 3-D Cu NW-MWCNT composites were introduced as a promising battery anode for fast charge-discharge lithium ion battery (LIB). When composite film formed, both Cu NWs and MWCNT as the highly conductive 1-D nanomaterials present tremendous advantages to be applied to the current collector and active materials for LIBs, because their high aspect ratio and large surface areas induce better transport for electrons and ions. As an advanced anode for LIBs, the Cu NWs-MWCNT composite film exhibited low sheet resistance and excellent stability with high flexibility. The 3-D porous architecture of Cu NWs is strongly contact with the MWCNTs leads to the improvement of the LIB performances. Furthermore, both half cell and full cell showed high specific capacities (466 mAh·g–1 and 113 mAh·g–1 at 0.2 C) with a high columbic efficiency, even operated at a high current (215 mAh·g–1 and 48 mAh·g–1 at 5 C). When applied for flexible LIBs, the specific capacity still remained 92.8% after bending 1,000 cycles.
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dc.description.tableofcontentsChapter 1. Introduction 1
1.1 Background on the Cu nanomaterials 1
1.2 Shape control of Cu nanomaterials 5
References 8
Chapter 2. Literature and Dissertation Overview 9
2.1 Synthetic methods of Cu NWs and their nanocomposites 9
2.2 Networking of Cu NWs for conductive electrode 14
2.3 Dissertation overview 19
References 24
Chapter 3. Novel Synthesis, Coating and Networking of Curved Copper Nanowires for Flexible Transparent Conductive Electrodes 26
3.1 Introduction 26
3.2 Experimental section 29
3.2.1 CCNs preparation 29
3.2.2 Linear Cu NWs preparation 29
3.2.3 CCNs films fabrication 30
3.2.4 CCNs and films Characterization 31
3.3 Results and discussion 32
3.3.1 Overview of whole process 32
3.3.2 Binary polyol co-reduction method 34
3.3.3 Meniscus-dragging deposition 45
3.3.4 Solvent-dipped annealing method 47
3.3.4 Flexible transparent conductive electrode 52
3.4 Conclusion 57
References 58
Chapter 4. Curved Copper Nanowires-based Robust Flexible Transparent Electrodes via All-solution Approach 61
4.1 Introduction 61
4.2 Experimental section 65
4.2.1 Preparation of CCNs via multi-polyol synthesis 65
4.2.2 CCN film coating via MDD 65
4.2.3 CCN film patterning via PU-stamped patterning....... 66
4.2.4 CCN percolation via solvent-dipped welding 67
4.2.5 CCN film smoothing via PU-embedded transfer 67
4.2.6 Characterization of CCNs and FTCEs 68
4.3 Results and discussion 69
4.3.1 Synthesis process.. 69
4.3.2 Coating process.. 77
4.3.3 Patterning process 83
4.3.4 Welding process 84
4.3.5 Transfer process 92
4.3.6 Flexible transparent conductive electrode 95
4.4 Conclusion 101
References 102
Chapter 5. Bridging Oriented Copper Nanowire-Graphene Composites for Solution-Processable, Annealing-Free, and Air-Stable Flexible Electrodes 105
5.1 Introduction 105
5.2 Experimental section 109
5.2.1 Reagents 109
5.2.2 Apparatus 109
5.2.3 Preparation of Cu NW-RGO composites 110
5.2.4 Fabrication of electrodes 110
5.3 Results and discussion 111
5.3.1 Solvothermal synthesis of CuNW-RGO composites 111
5.3.2 Unique properties of Cu NW-RGO composites … 124
5.3.3 Flexible and wearable electrodes 135
5.4 Conclusion 140
References 141
Chapter 6. Copper Nanowire/Multi-walled Carbon Nanotube Composites as All-nanowire Flexible Electrode for Fast-Charging/Discharging Lithium-ion Battery 145
6.1 Introduction 145
6.2 Experimental section 149
6.2.1 Synthesis of CuNWs 149
6.2.2 Fabrication of CNMC anodes 150
6.2.3 Material characterizations 150
6.2.4 Electrochemical measurements 151
6.3 Results and discussion 153
6.3.1 Preparation and characterization of CNMC anode 153
6.3.2 Properties and merits of CNMC anode … 157
6.3.3 Electrochemical analysis of CNMC anode 169
6.3.4 Flexible lithium-ion battery 178
6.4 Conclusion 180
References 181
Chapter 7. Conclusion 184
(Appendix) Chapter 8. Rose Rock-shaped Nano Cu2O anchored Graphene for High-Performance Supercapacitors via Solvothermal Route 186
8.1 Introduction 186
8.2 Experimental section 191
8.2.1 Reagents 191
8.2.2 Apparatus 191
8.2.3 Preparation of Cu2O-GN composite 192
8.2.4 Electrochemical testing 193
8.3 Results and discussion 194
8.3.1 Characterization of Cu2O-GN composite 194
8.3.2 Formation mechanism of Cu2O-GN composite … 200
8.3.3 Electrochemical tests 211
8.4 Conclusion 221
References 222
국 문 초 록 226
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dc.formatapplication/pdf-
dc.format.extent13094493 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectCopper nanowire-
dc.subjectFlexible transparent electrode-
dc.subjectWearable electrode-
dc.subjectLithium ion battery-
dc.subjectCurrent collector-
dc.subject.ddc620.5-
dc.titleNovel Synthesis of Copper Nanowires and Hybrid Nanocomposites with Carbon for Functional Electrodes-
dc.title.alternative기능성 전극을 위한 구리 나노선과 탄소 복합체 물질의 합성 연구-
dc.typeThesis-
dc.contributor.AlternativeAuthorZhenxing Yin-
dc.description.degreeDoctor-
dc.contributor.affiliation융합과학기술대학원 융합과학부-
dc.date.awarded2018-02-
Appears in Collections:
Graduate School of Convergence Science and Technology (융합과학기술대학원)Dept. of Transdisciplinary Studies(융합과학부)Theses (Ph.D. / Sc.D._융합과학부)
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