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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 李慧梅(Whei-May Lee) | |
| dc.contributor.author | Meng-Tsung Hsu | en |
| dc.contributor.author | 徐孟琮 | zh_TW |
| dc.date.accessioned | 2021-06-13T15:28:26Z | - |
| dc.date.available | 2008-07-21 | |
| dc.date.copyright | 2008-07-21 | |
| dc.date.issued | 2008 | |
| dc.date.submitted | 2008-07-16 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37446 | - |
| dc.description.abstract | 本研究探討奈米碳管特性對利用負極放電電極產生空氣負離子的影響，並且探討發展微型空氣清淨裝置的可行性。實驗主要探討:奈米碳管在一維與二維金屬基體上、奈米碳管長徑比、奈米碳管排列、多壁與單壁奈米碳管、金屬材質、金屬長徑比、金屬針尖曲率對放電電壓之影響、產生空氣負離子之穩定度和有效作用距離、偵測臭氧濃度。奈米碳管在一維比在二維金屬基體上具有較低的放電，因為電子能夠聚集於一維基體尖端，使電子激發較容易。奈米碳管長徑比愈大，場增強效應(enhanced field emission)愈大，所以放電電壓亦愈低。奈米碳管陣列因規則排列能降低屏蔽效應(screening effect)，可以有效地降低放電電壓。單壁奈米碳管比多壁奈米碳管具有較大的長徑比、較好的導電性，所以具有較低的放電電壓。在相同電壓下，奈米碳管長徑比愈大，負極放電產生空氣負離子濃度之穩定度愈好。空氣負離子濃度會隨著距離的增加而遞減，呈現對數線性遞減的關係，並在反應器內距離超過60cm後，空氣負離子濃度皆為背景值。奈米碳管在銅或銀電極上，分別在電壓1.6kV與1.4kV即可產生空氣負離子濃度達極限偵測範圍，並且無臭氧的產生，皆在電壓3.0kV時，開始分別產生臭氧濃度0.6ppb與0.5ppb，且臭氧濃度隨著放電電壓的增加而迅速增加。 | zh_TW |
| dc.description.abstract | This study investigated the traits of carbon-nanotubes (CNTs) affect generation of negative air ions (NAIs) by negative electric discharging, and investigated the feasibility of developing a microscale air cleaner. The research investigated the effect of the discharging voltage about CNTs on the one and two dimension metal substrate, the aspect ratio of CNTs, aligned CNTs, single-walled and multi-walled CNTs, metal material, metal aspect ratio, metal needle-point curvature, the stability and the effective distance of NAIs which were generated by negative electric discharging, dectecting ozone concentration. Because electrons can gather on need-point of one dimension substrate to make electrons excite easilier, the discharging voltage of CNTs on the one dimension metal substrate gets lower than other on the two dimension metal substrate. The enhanced field emission gets bigger and the discharging voltage gets lower when the aspect ratio of CNTs gets bigger. Beacause CNTs array align regularly, it can reduce screening effect and the discharging voltage effectively. Because of bigger aspect ratio and better conductivity the discharging voltage of Single-walled CNTs gets lower than the one of multi-walled CNTs. At the same discharging voltage, the stability of NAIs which were generated by negative electric discharging gets better when the aspect ratio of CNTs gets bigger. The NAIs concentration decreased when the distance increased, and The NAIs concentration and the distance indicated logarithmic linear relationship. The NAIs concentration of CNTs on copper and silver electrode which was used as the negative electrode to generate NAIs can reach detecting limit range when the discharging voltage was about 1.6 kV and 1.4 kV, and there was no generation of ozone. When the discharging voltage was about 3.0 kV, ozone concentration which was generated by CNTs on copper and silver electrode was about 0.5 ppb and 0.6 ppb, and ozone concentration increased fast when the discharging voltage increased. | en |
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| dc.description.tableofcontents | 第 一 章 前言 5
1-1 研究緣起 1 1-2 研究目的 2 1-3 研究內容與方法 2 第 二 章 文獻回顧 5 2-1 奈米碳管之發現 5 2-2 奈米碳管之結構 5 2-2-1 單壁奈米碳管 6 2-2-2 多壁奈米碳管 9 2-3 奈米碳管之特性 10 2-3-1 電學特性 10 2-3-2 場發射特性 11 2-3-3 熱傳導特性 14 2-4 奈米碳管之合成 16 2-4-1 電弧放電法 16 2-4-2 雷射汽化法 17 2-4-3 化學氣相沉積法 18 2-5 奈米碳管之定位技術 20 2-5-1 噴墨技術 20 2-5-2 光學微影技術 21 2-5-3 電子束微影技術 22 2-5-4 奈米圖章製程 24 2-6 奈米碳管之應用與發展 26 2-7 空氣離子 27 2-8 空氣離子對人體健康之影響 31 第 三 章 實驗設備與方法 34 3-1 實驗系統概述 34 3-2 實驗設備 37 3-2-1 空氣負離子產生設備 37 3-2-1-1 高壓電源供應器 37 3-2-1-2 放電系統 38 3-2-1-3 乾淨空氣供應系統 38 3-2-1-4 空氣離子反應器 39 3-2-2 偵測設備與相關儀器 39 3-2-2-1 空氣負離子偵測器 39 3-2-2-2 臭氧偵測器 40 3-3 實驗方法 41 3-3-1 起始與極限放電電壓 41 3-3-2 金屬電極與奈米碳管長徑比 41 3-3-3 奈米碳管之排列 42 3-3-4 奈米碳管放電產生空氣負離子之穩定度 42 3-3-5 空氣負離子有效作用距離 43 3-3-6 奈米碳管放電產生臭氧 43 第 四 章 結果與討論 44 4-1 背景實驗 44 4-1-1 實驗室室內空氣負離子濃度 44 4-1-2 空氣流量對空氣負離子濃度之影響 46 4-2 金屬電極放電電壓與空氣負離子濃度之關係 51 4-2-1 不同電極材質對放電電壓之影響 51 4-2-2 金屬電極針尖曲率對放電電壓之影響 58 4-2-3 金屬電極長徑比對放電電壓之影響 61 4-2-3-1 銅電極長徑比對放電電壓之影響 61 4-2-3-2 銀電極長徑比對放電電壓之影響 64 4-3 奈米碳管特性對放電電壓之影響 67 4-3-1 奈米碳管在一維與二維基體上對放電電壓之影響 67 4-3-2 奈米碳管長徑比對放電電壓之影響 72 4-3-3 奈米碳管排列對放電電壓之影響 76 4-3-4 奈米碳管在不同基體上對放電電壓之影響 80 4-3-4-1在不同長徑比基體上對放電電壓之影響 80 4-3-4-2在不同針尖曲率基體上對放電電壓之影響 85 4-3-5 單壁奈米碳管對放電電壓之影響 88 4-4 奈米碳管放電產生空氣負離子之穩定度 93 4-5 空氣負離子有效作用距離 101 4-6 奈米碳管放電產生臭氧之偵測 105 第 五 章 結論與建議 110 5-1 結論 110 5-2 建議 112 | |
| dc.language.iso | zh-TW | |
| dc.subject | 奈米碳管陣列 | zh_TW |
| dc.subject | 長徑比 | zh_TW |
| dc.subject | 空氣負離子 | zh_TW |
| dc.subject | 場增強效應 | zh_TW |
| dc.subject | 屏蔽效應 | zh_TW |
| dc.subject | screening effect | en |
| dc.subject | negative air ions (NAIs) | en |
| dc.subject | carbon-nanotubes (CNTs) array | en |
| dc.subject | aspect ratio | en |
| dc.subject | enhanced field emission | en |
| dc.title | 奈米碳管特性對放電產生空氣負離子影響之研究 | zh_TW |
| dc.title | The traits of carbon-nanotubes affect generation of negative air ions by electric discharging | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 96-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 李家偉(Gu-Wei Lee),吳致呈(Chih-Cheng Wu) | |
| dc.subject.keyword | 空氣負離子,奈米碳管陣列,長徑比,場增強效應,屏蔽效應, | zh_TW |
| dc.subject.keyword | negative air ions (NAIs),carbon-nanotubes (CNTs) array,aspect ratio,enhanced field emission,screening effect, | en |
| dc.relation.page | 121 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2008-07-17 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 環境工程學研究所 | zh_TW |
| 顯示於系所單位： | 環境工程學研究所 | |
文件中的檔案：
| 檔案 | 大小 | 格式 | |
|---|---|---|---|
| ntu-97-1.pdf 未授權公開取用 | 3.76 MB | Adobe PDF |
系統中的文件，除了特別指名其著作權條款之外，均受到著作權保護，並且保留所有的權利。