{"created":"2023-06-20T13:20:36.671577+00:00","id":646,"links":{},"metadata":{"_buckets":{"deposit":"80147c55-ee9d-42b0-82f6-f85dc2ce2f5b"},"_deposit":{"created_by":1,"id":"646","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"646"},"status":"published"},"_oai":{"id":"oai:ir.soken.ac.jp:00000646","sets":["2:428:14"]},"author_link":["0","0","0"],"item_1_creator_2":{"attribute_name":"著者名","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Liu, Huarong"}],"nameIdentifiers":[{"nameIdentifier":"0","nameIdentifierScheme":"WEKO"}]}]},"item_1_creator_3":{"attribute_name":"フリガナ","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"リュウファロン"}],"nameIdentifiers":[{"nameIdentifier":"0","nameIdentifierScheme":"WEKO"}]}]},"item_1_date_granted_11":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2007-09-28"}]},"item_1_degree_grantor_5":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"総合研究大学院大学"}]}]},"item_1_degree_name_6":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（工学）"}]},"item_1_description_12":{"attribute_name":"要旨","attribute_value_mlt":[{"subitem_description":"　　Carbon nanotubes (CNT) were firstly discovered by Iijima in 1991. An ideal nanotube can be considered as a hexagonal network of carbon atoms that has been rolled up to make a seamless hollow cylinder. The CNT length ranges from micrometers to centimeters while the diameter is only several nanometers. There are a variety of applications of CNTs since they have many special properties, such as remarkable electronic transport properties,unusual mechanical properties.\r\n　　Among these applications, an important one is to fabricate all kinds of field-emission electron sources. Their huge aspect ratios can dramatically concentrate an applied electric field on their tips; their excellent electric and thermal conductance guarantee good field emission stability; their extremely high melting point makes them possible to work at a critical condition. Therefore, they are considered as promising field emission materials.\r\n　　The purpose of this thesis is focused on producing field emitter with large current density, long lifetime, high stability and good repeatability; the following work has been carried out.\r\n\r\n1.Field-emission theory and properties of carbon nanotubes have been reviewed. The\r\n　reason that CNTs are regarded as promising field-emission materials has been\r\n　discussed; the main achievements and demerits of current CNT emitters are also\r\n　investigated.\r\n2.Main equipments related to this research have been introduced, such as experimental\r\n　setup for field-emission test, SEM, and magnetron sputtering deposition system.\r\n3.The rooting technique has been greatly improved by introducing metal substrates\r\n　deposited with thin titanium films. The influence of film thickness on the\r\n　field-emission performance has been studied;2μm is decided as appropriate\r\n　selection.\r\n　More than 15 A/cm<sup>2</sup> with a total current of～10mA was reached at～6.0 V/μm. The\r\n　lifetime of this kind of emitter was as long as 800 hours at 5.0 A/cm<sup>2</sup> with only a\r\n　2.50% increase of the applied electric field. By introducing Ti-particles during the\r\n　rooting process, the maximum emission current density could reach as high as\r\n　338A/cm<sup>2</sup>, which was the highest value reported so far.\r\n4.The influence of nano-sized particles appended to CNTs on field emission has been\r\n　investigated; based on the impregnation with RuO<small>2</small> nano-sized particles and the \r\n　above technique, a low threshold field of ～0.85 V/μm, corresponding to 10 mA/cm<sup>2</sup>,\r\n　has been reached.\r\n5.Field-emission arrays (FEA) have been introduced to achieve a high emission current.\r\n　The field-emission behavior of a single emitter in a FEA has been studied. A new type\r\n　of FEA is put forward to improve the performance of emitters based on this study; the\r\n　effect has been experimentally proved. At the same time, the reliance of emission\r\n　current density on sample area is also studied.\r\n6.The future work has been discussed; new methods have been put forward, which are\r\n　very possible to further improve the field emission performance for our field emitters.","subitem_description_type":"Other"}]},"item_1_description_7":{"attribute_name":"学位記番号","attribute_value_mlt":[{"subitem_description":"総研大甲第1092号","subitem_description_type":"Other"}]},"item_1_relation_13":{"attribute_name":"関連サイト","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"修了生論文 | KEK:総合研究大学院大学"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"http://soken.kek.jp/sokendai/intro/title","subitem_relation_type_select":"URI"}}]},"item_1_select_14":{"attribute_name":"所蔵","attribute_value_mlt":[{"subitem_select_item":"有"}]},"item_1_select_8":{"attribute_name":"研究科","attribute_value_mlt":[{"subitem_select_item":"高エネルギー加速器科学研究科"}]},"item_1_select_9":{"attribute_name":"専攻","attribute_value_mlt":[{"subitem_select_item":"12 加速器科学専攻"}]},"item_1_text_10":{"attribute_name":"学位授与年度","attribute_value_mlt":[{"subitem_text_value":"2007"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"LIU,  Huarrong","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"0","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-02-17"}],"displaytype":"simple","filename":"甲1092_要旨.pdf","filesize":[{"value":"225.3 kB"}],"format":"application/pdf","licensetype":"license_11","mimetype":"application/pdf","url":{"label":"要旨・審査要旨","url":"https://ir.soken.ac.jp/record/646/files/甲1092_要旨.pdf"},"version_id":"116b9358-2f45-489f-8f21-0f294f1a8dbf"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"thesis","resourceuri":"http://purl.org/coar/resource_type/c_46ec"}]},"item_title":"Study on High Intensity Field Emission from Carbon Nanotubes","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Study on High Intensity Field Emission from Carbon Nanotubes"},{"subitem_title":"Study on High Intensity Field Emission from Carbon Nanotubes","subitem_title_language":"en"}]},"item_type_id":"1","owner":"1","path":["14"],"pubdate":{"attribute_name":"公開日","attribute_value":"2010-02-22"},"publish_date":"2010-02-22","publish_status":"0","recid":"646","relation_version_is_last":true,"title":["Study on High Intensity Field Emission from Carbon Nanotubes"],"weko_creator_id":"1","weko_shared_id":1},"updated":"2023-06-20T15:54:22.829379+00:00"}