| 研究生: |
甘明吉 Kan, Ming-Chi |
|---|---|
| 論文名稱: |
奈米尺寸碳材料之電子發射特性 The electron emitting characteristics of nano-sized carbon materials |
| 指導教授: |
黃肇瑞
Huang, Jow-Lay |
| 學位類別: |
博士 Doctor |
| 系所名稱: |
工學院 - 材料科學及工程學系 Department of Materials Science and Engineering |
| 論文出版年: | 2004 |
| 畢業學年度: | 92 |
| 語文別: | 中文 |
| 論文頁數: | 167 |
| 中文關鍵詞: | 場發射 、鑽石材料 、奈米碳管 、場發射平面顯示器 |
| 外文關鍵詞: | Field emission, Diamond, Carbon nanotubes, Field Emission Display |
| 相關次數: | 點閱:124 下載:4 |
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本研究針對奈米結構之非晶鑽石薄膜及奈米碳管之電子場發射行為,以陰極電弧沉積非晶鑽薄膜為主軸並與奈米碳管及文獻上之其他場發射子材料作比較。此外本研究將探討奈米結構之非晶鑽石薄膜之電子場發射穩定性、再現性及高溫電子場發射之特性,進而研究將其鍍在ITO玻璃及Al 尖錐陣列基板上之性質。
實驗是以不同之參數 (偏壓、電弧電流、氬氣及氮氣流量等)來控制非晶鑽石薄膜之鍵結形態及幾何形狀,探討其對電子場發射性質的影響。由實驗結果得知,適當的sp3/(sp3+sp2) 之比例、氮原子含量及較大長寬比之奈米尖錐可獲得較佳之電子場發射特性。
在場發射平面顯示器的應用方面,為了低成本及大面積化,使非晶鑽石膜能成功地應用在電子場發射元件上,除以研究其低起始電壓及高電流密度之特性外,本研究亦利用陰極電弧之低溫成長之特點,在ITO玻璃及微米鋁尖錐陣列基材上沉積奈米結構之非晶鑽石薄膜,並探討其對於電子場發射性質的影響。結果顯示奈米結構非晶鑽石薄膜可成功地沉積在ITO玻璃及微米鋁尖錐陣列基材上,且奈米結構非晶鑽石薄膜擁有高場發射穩定性、熱穩定性、環境穩定性及高再現性,証明奈米結構非晶鑽石薄膜可應用於高穩定性及低成本之場發射平面顯示器 應用。
近十年來,奈米碳基材料之常溫場發射特性及其穩定性已被廣泛的研究,但其在高溫之場發射特性及其穩定性卻很少有人研究。為了研究之完整性,亦探討奈米尖錐結構非晶鑽石薄膜及奈米碳管之高溫電子發射特性,以了解二者碳基材料之高溫電子發射行為。由實驗結果証實奈米碳管及非晶鑽石薄膜之熱-場電子發射行為有非常大之不同,非晶鑽石薄膜之溫度對於電子發射有較大的影響,故非晶鑽石薄膜之熱激發比奈米碳管更有效促進電子之發射,這是由於非晶鑽石內部存有缺陷能帶。
研究亦用熱處理來改變非晶鑽石薄膜的熱激發射電子特性的影響。由實驗得知,熱處理後,非晶鑽石之熱激發敏感性增加,溫度對電子發射的影響增加,進而有效地促進熱激發射電子的效應。
綜合實驗之結果顯示,以傳統陰極電弧物理氣相沉積法,可沉積低起始電場強強度、高電流密度、高場發射穩定性、熱穩定性、環境穩定性及高再現性之非晶鑽石,且亦可沉積於低成本及易大面積化之基材上,証明非晶鑽石薄膜可應用於高穩定性及低成本之場發射平面顯示器應用。
Field emission characteristics of Nano-structured amorphous diamond and carbon nanotubes were reported in this study. We focus on amorphous diamond films deposited by cathodic arc and compare with carbon nano-tubes and other emitter materials in the literatures. However, in order to realize practical Field Emission Displays (FEDs), these carbon-based films should meet other requirements such as uniformity, stability, reproducibility, wide operating temperature range, and low deposition temperature. Hence, stability, reproducibility, and high temperature performance of electron emission were also investigated. Moreover, the electron field emission of amorphous diamond films deposited on ITO glass substrates and micro aluminum cone arrays were also studied in order to explore the potential for large-area application.
In this study, comparison of field emission characteristics of different geometrical shapes and bonding structure of amorphous diamond films were investigated. The influences of arc current, nitrogen content and argon content on depositing amorphous diamond are also discussed. This research demonstrated that both bonding structure and geometrical structure of amorphous diamond could be controlled by varying the current of the cathodic arc, argon content and nitrogen content. The electron emission was dependent on aspect ratio of nano-tips, bonding structure, and nitrogen content. Moreover, amorphous diamond can be deposited with a high-density (4´1010 emitters/cm2) of nano-sized emitters.
Specifically for FEDs applications, field emission arrays fabricated on a glass substrate, for low cost large-area applications were studied. In this thesis, nano-structured amorphous diamond films were deposited on ITO glass substrates utilizing a cathodic arc at a substrate temperature of less than 150 oC. We have reported on the stability in field emission of nano-structured amorphous diamond films deposited on ITO glass and micro aluminum cones substrates. The stability of field emission, thermal stability, environmental stabilities, and high reproducibility have also been studied. From the experimental results, this research demonstrated high stability and low-cost for FEDs applications.
The filed emission characterization of nano-carbon based materials at low temperature has been extensively studied. Practically, the large working temperature range and its high temperature stability have played an important role on the application of FEDs. However, only very few researchers has concentrated on the field emission characterization and the stability of nano-carbon based materials at high temperatures. The electron emission characteristics of amorphous diamond films and carbon nanotubes in high temperature were also reported in this study. From experimental results, when the cathode material is heated up, the responses of electron thermal-filed emission in vacuum are dramatically different between the two types of carbon materials. Electron emission of amorphous diamond films was more sensitive to temperature than carbon nanotubes. The thermally agitated emission of amorphous diamond suggests the presence of a defect band that allows electrons to “climb the ladder” with the thermal enhancement so they can overcome the work function with ease.
Moreover, heat treatment was used in order to improve thermally agitated emission of amorphous diamond films. Electron emission of amorphous diamond films was more sensitive to temperature after heat treatment. Therefore, the thermally agitated emission of amorphous diamond was enhanced by heat treatment.
The capabilities of nano-structured amorphous diamond for field emission deposited by cathodic arc have been fully demonstrated in this study. However, The commercial usage of FPDs is dependent on the uniformity and stability of electronic field emission, as well as the reproducibility of its performance. In this study, the results of amorphous diamond film will be extended to investigate the principles and characteristics of electron field emission. Moreover, the manufacturing parameters for producing amorphous diamond with low turn-on applied field, high emission current density, high stabilities, and high reproducibility emission characteristics, durable performance and low-cost was achieved.
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