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研究生： 李彥陞
Yan-Sheng Li
論文名稱： 綠色高產率石墨烯奈米帶製成即可撓式氧化石墨烯奈米帶/奈米碳管導電複合材料應用
A green and high-yield synthesis of graphene nanorubbon, and demonstration of water-soulable CNT/GONR flexible conductive hybrid
指導教授： 江偉宏
Wei-Hung Chiang
口試委員: 何國川
Kuo-Chuan Ho
江志強
Jyh-Chiang Jiang
學位類別： 碩士
Master
系所名稱： 工程學院 - 化學工程系
Department of Chemical Engineering
論文出版年： 2016
畢業學年度： 104
語文別： 英文
論文頁數： 88
中文關鍵詞： 石墨烯奈米帶
外文關鍵詞： unzipping of CNTs
相關次數： 點閱：311  下載：1 
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    • 一綠色且適用於工業化之石墨烯奈米帶製成，核心概念為選入適當嵌入分子鹽類有效降低大量硫酸使用，進一步達成產率接近百分之百的石墨烯奈米帶製成。
    可撓式導電元件為現今科技發展最具前瞻性的製技術之一，尤其以奈米碳基材最影前瞻性。 然而現今以奈米碳基材的可撓導電元件製成受限於其材料本身疏水性，因而在製程時造成環境汙染及降低其性能。本研究使用了奈米複合材料的概念，利用氧化石墨烯奈米帶和奈米碳管之性質，產生一水溶性且可撓式高導電複合材料。

    Graphene nanoribbons (GNRs) represent a unique form of carbon materials, and their exceptional properties have spurred intensive interest in many applications. The oxidative unzipping using the mixture of H2SO4 and KMnO4 has been demonstrated the most effective method to produced GNRs in a large quantity. However large amount of concentrated H2SO4 (normally 1 mg/ml of CNT concentration in H2SO4) were required to unzip the CNTs completely. The difficulty is due to the van der Waals forces between the coaxial graphene cylinders of CNTs. Therefore there is still a need to develop an environmentally friendly and scalable method to produce GNRs. Here we report a simple wet-chemistry-based oxidative process for producing a nearly 100% yield of GNRs by lengthwise unzipping the multi-walled CNTs (MWCNTs). While oxidative unzipping of MWCNTs has previously been achieved, we used very low amount of H2SO4 (10 mg/ml of CNT concentration in H2SO4) to unzip the MWCNTs effectively.
    Flexible electronics is a promising technology for convenient transportation and diverse deployment of large volume electronics. In the past few years, many reports have been demonstrated that carbon materials such as graphene and carbon nanotube (CNTs) can be used as the conductive materials for the paper-based flexible electronics. However, it is still difficult to further improve the device performance due to their limited film-based electrical conductance as a result of poor dispersion of carbon materials during the film fabrication. While the conventional preparation of carbon-based conductive paper is to add large amount of surfactants or organic solvent to obtain well dispersion stability, the non-conductive surfactants normally stay on substrates and reduce the overall electrical conductance. In addition, adding non-environmental-friendly surfactants or organic solvents will increase the cost. Here we report a facile fabrication of flexible and surfactant-free conductive paper using carbon nanotube and graphene nanoribbon (GNRs) composites.

    Abstract I Table of Content IV List of figure VI List of table X 1. Introduction 1 1.1 Introduction of graphene nanoribbon 1 1.2 Synthesis of graphene nanoribbon 5 1.2.1 Plasma etching of graphene 6 1.2.2 Metal-catalyzed cutting of graphene 8 1.2.3 Chemical vapor deposition 9 1.2.4 Chemical unzipping of CNTs 10 1.3 Introduction of carbon nanotube intercalation 11 1.4 Motivation of green and high yield synthesis of grahene nanoribbon 13 1.5 Approaching of green and high yield synthesis of graphene nanoribbon 15 1.6 Introduction of carbon-based flexible electronics 18 1.7 Motivation and approach of CNT/GONR conductive hybrid 22 2. Experimental methods and process 24 2.1 Synthesis of graphene nanoribbon 24 2.1.1 Experimental chemicals 24 2.1.2 Pretreatment 24 2.1.3 Oxidative CNTs unzipping 26 2.1.4 Purification 28 2.2 Fabrication of CNT-GONR conductive hybrid 29 2.3 Characterization 31 2.3.1 Scanning electron microscope (SEM) and sample preparation 31 2.3.2 High-resolution transmission electron microscope (HRTEM) and sample preparation 31 2.3.3 High-resolution X-ray photoemission spectra (XPS) and sample preparation 31 2.3.4 High-resolution X-ray diffraction (XRD) 32 2.3.5 Raman spectra 32 3. Result and discussion 33 3.1 Characterization of as-pretreated CNTs 33 3.1.1 Raman spectroscopy 33 3.1.2 X-ray photoelectron spectroscopy (XPS) 36 3.1.3 X-ray diffraction (XRD) 38 3.2 Characterization of as-produced graphene nanoribbon 40 3.2.1 Scanning electron microscope (SEM) and High-resolution transmission electron microscope (HRTEM) 41 3.2.2 X-ray diffraction (XRD) 44 3.2.3 X-ray photoelectron spectroscopy (XPS) 47 3.3 CNT-GONR conductive hybrids 51 3.3.1 Water solution processability studies of CNTs and as-produced GONRs 51 3.3.2 Electrical sheet resistance studie as-produced GONRs 53 3.3.3 Morphology and solution processability of CNT/GONR hybrids 56 3.3.4 Sheet resistance studied of CNT/GONR hybrids 59 3.3.5 LED-circuit demonstration of as-fabricated films 63 4. Conclusion 65 5. References 67

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