表面鍍覆六方晶系氮化硼之奈米碳管:界面極化強化場發射特性

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研究生：	張瀚丞 Chang, Han Chen
論文名稱：	表面鍍覆六方晶系氮化硼之奈米碳管:界面極化強化場發射特性 Hexagonal boron nitride coated carbon nanotubes：interlayer polarization improved field emission
指導教授：	徐文光 Hsu, Wen Kuang
口試委員:	李紫原 Lee, Chi Young 林樹均 Lin, Su Jien 郭信甫 Kuo, Hsin Fu 郭信良 Kuo, Hsin Liang
學位類別：	博士 Doctor
系所名稱：	工學院 - 材料科學工程學系 Materials Science and Engineering
論文出版年：	2015
畢業學年度：	103
語文別：	英文
論文頁數：	70
中文關鍵詞：	奈米碳管、場發射、氮化硼、界面極化
外文關鍵詞：	Carbon nanotube, Field emission, Boron nitride, Interlayer polarization
相關次數：	點閱：3 下載：0
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奈米碳管具有高機械強度、強化學穩定性、高長徑比與場增強因子等特性，相當適合作為場發射之發射體。在本文中，我們將奈米碳管鍍覆上六方晶系之氮化硼，使界面處產生極化現象使得電子分別坐落於氮原子及碳原子處，且在氮化硼和奈米碳管間產生一電場，此電場會幫助電子穿越氮化硼和奈米碳管之界面處然後由氮的電子填滿帶及硼的電子未填滿帶射出。鍍有氮化硼之奈米碳管之場發射電流密度具有更高的穩定性，其波動程度在4%之內。文中量測到之起始電場由奈米碳管的6.51 V/μm變成鍍完氮化硼後的2.65-2.67 V/μm；臨界電場由9.82 V/μm變為4.41-4.43 V/μm。

Carbon nanotubes (CNTs) which have high mechanical strength, chemical stability, aspect ratio, and field enhancement factor (β) are considered as ideal field emitters. In this thesis, coating of h-BN onto carbon nanotubes induces polarization at interfaces and charges become localized at N and C atoms respectively. Field emission of coated tubes is found to be highly stable and current density fluctuates within 4%. Study further reveals that electric field established between coatings and tubes facilitates charge transfer across interfaces and electrons are emitted through occupied and unoccupied bands of N and B atoms. Measurements give turn on field = 6.51 V/μm for CNTs and 2.65-2.67 V/μm for coated tubes; the threshold field being measured to be 9.82 V/μm and 4.41-4.43 V/μm respectively.

摘要                                                      I
Abstract                                             II
誌謝                                                    III
Contents                                              V
List of Figures                                            VII
List of Tables                                              X
Chapter 1 Introduction                                      1
1-1 Introduction of carbon nanotubes                      1
1-1-1 Structure of carbon nanotubes                      2
1-1-2 Electronic properties of Carbon Nanotubes              5
1-1-3 Mechanical property of carbon nanotubes             10
1-1-4 Syntheses of carbon nanotubes                     11
1-2 Introduction of field emission                     14
1-2-1 Tunneling current density                             16
1-2-2 Fowler-Nordheim tunnelling current density     22
1-2-3 FN equation and 1D nanostructures field emitter     24
1-3 Introduction of boron nitride                     26
1-3-1 Structures of boron nitride                     27
1-3-2 Benefits of boron nitride to field emission     30
1-4 Density function theory                             33
1-4-1 Ab initio DFT calculation                             34
Chapter 2 Motivation                                     35
Chapter 3 Experimental section                             38
3-1 Prepare BN coated multiwalled CNTs (MWCNTs) by chemical vapor deposition                                     38
3-2 Characterization instruments                     40
Chapter 4 Results and discussion                     42
4-1 Characterization of h-BN coated CNTs             42
4-2 Field emission properties and ab initio calculation of h-BN coated CNTs                                     52
Chapter 5  Conclusions                                     61
Chapter 6  Reference                                     62

                                

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