200805414 - 九、發明說明： ^ 【發明所屬之技術領域】 本發明涉及-種碳奈米管絲陰極體之製造方法。 【先前技術】 破奈米管絲是由破奈米管陣列得到的，美國7,〇45，1〇8 ^ 6,957,993號專齡紹了碳奈米管_製造方法。後奈米 官絲的出簡會促較觀碳奈綺_件的發展。 • 碳奈米管絲的端面具有良好的場發射性能，可以作爲 琢發射電子源但故奈米官絲的端部形貌具有很大的隨機 性，而端部形貌對場發射影響报大，因此，不同的碳奈米 管絲場發射性能可能有很大差異。此外，碳奈米管絲的長 度也不好控制。因此，要批量製備場發射性能一致的陰極 發射體是比較困難的。 【發明内容】 有鑒於此，有必要提供—種碳奈米管絲陰極體之製造 審方法，從而可以批里製備場發射性能一致的陰極發射體。 一種碳奈米管絲陰極體之製造方法，其包括以下步 驟··提供一根碳奈米官絲；由該根碳奈米管絲得到若干段 碳奈米管絲，將又兔奈米管絲粘在金屬絲的一端；將該 段碳奈米管絲置於火焰中燃燒，得到一個碳奈米管絲陰極 體。 將由上述方法第二步驟得到的若干段碳奈米管絲，依 次重復第三、第四步驟，可以得到多個碳奈米管絲陰極體。 利用上述方法製造得到的碳奈米管絲陰極體的長度和端部 200805414 形貌具有較好的-致性’其場發射性能也比較—致， 批量製造性能一致的後奈米管絲陰極體。 " 【實施方式】 下面將結合附圖對本發明實施例作進一步的詳細观 一種碳奈米管絲陰極體之製造方法包括以下步騍. 提供一根碳奈米管絲； ^ 藝由該根碳奈米管絲得到若干段碳奈米管絲； 將一段碳奈米管絲粘在金屬絲的一端； 將該段碳奈米管絲置於火焰中燃燒，得到一個碳齐米 旨絲陰極體。 ' 下面將結合附圖，對本發明實施例碳奈米管絲陰極體 之製造方法進行說明。 "" 步驟一：提供一根碳奈米管絲。 該碳奈米管絲可以通過以下方法得到：提供一基底； _ 將催化劑沈積於該基底表面；通入碳源氣與保護氣體的混 合氣體使碳奈米管陣列從基底上長出；于碳奈米管陣列中 選定一包括多個碳奈米管束的碳奈米管束片段，並使用拉 伸工具拉伸該碳奈米管束片段，使碳奈米管絲沿拉伸方向 形成。其中’該基底爲平整光滑的基底’催化劑與環境溫 度差在50°C以上，碳源氣的分壓低於20%。碳奈米管絲的 製造方法可以參見美國7,045，108及6,957,993號專利等。 步驟二··由該碳奈米管絲得到若干段碳奈米管絲。 通過機械方法或者非機械方法’由該破奈米管絲得到 200805414 ^ 若干段碳奈米管絲。機械方法指用剪刀剪斷，或者用鋒利 ; 的刀片劃斷等等。非機械方法指用鐳射切斷、火焰燒斷等 等。每段碳奈米管絲的長度可以隨意控制，對長度沒有精 確要求。 步驟三：將一段碳奈米管絲粘在金屬絲的一端。 可以採用銀膠等材料將一段碳奈米管絲粘在金屬絲的 一端。作爲支撐體的金屬需要能夠導電、導熱，有足夠的 強度即可。在本實施例中採用銅絲。 w 步驟四：將該段碳奈米管絲置於火焰中燃燒，得到碳 奈米管絲陰極體。 將粘有碳奈米管絲的金屬絲一端置於火焰中進行烘 烤，例如酒精燈火焰等。這時，每段碳奈米管絲的前端會 在高溫火焰中燃燒掉，但由於碳奈米管優良的導熱性，碳 奈米管絲靠近金屬絲的部分會有一定長度的碳奈米管絲保 留下來。該長度與火焰的溫度和氧化氣氛、碳奈米管絲的 血 直徑、以及金屬絲的直徑有關，當這些條件固定後，燃燒 後保留的碳奈米管絲長度即確定。 在本實施例，在空氣中，採用約450°C的火焰燃燒碳 奈米管絲，碳奈米管絲的直徑約50/zm，金屬絲採用銅絲， 銅絲的直徑約600//m，這時候燃燒後保留的碳奈米管絲長 度約0.5mm。 將由上述方法第二步驟得到的若干段碳奈米管絲，依 次重復第三、第四步驟，可以得到多個碳奈米管絲陰極體。 用此方法製造得到的三個碳奈米管絲陰極體分別編號爲 8 200805414 A、B及C，它們的顯微鏡照片分別如圖ΙΑ、圖1B及圖 1C所示。由圖可以看出，用本方法得到的三個碳奈米管絲 陰極體的長度和端部形貌具有較好的一致性。該三個碳奈 米管絲陰極體A、B及C對應的場發射曲線分別如圖2A、 圖2B及圖2C所示。圖2A、圖2B及圖2C的橫坐標代表 電壓，符號爲U，單位是伏(V);縱坐標代表電流，符號爲 I，單位是安培(A)。由圖可以看出，該三個碳奈米管絲陰 極體的場發射性能也比較一致。 利用此方法製造得到的碳奈米管絲陰極體的長度和端 部形貌具有較好的一致性，其場發射性能也比較一致，因 此適合批量製造性能一致的碳奈米管絲陰極體。 綜上所述，本發明符合發明專利要件，爰依法提出專 利申請。惟，以上所述者僅為本發明之較佳實施方式，本 發明之範圍並不以上述實施方式為限，舉凡熟習本案技藝 之人士援依本發明之精神所作之等效修飾或變化，皆應涵 蓋於以下申請專利範圍内。 【圖式簡單說明】 圖1A爲編號A的碳奈米管絲陰極體的顯微鏡照片。 圖1B爲編號B的碳奈米管絲陰極體的顯微鏡照片。 圖1C爲編號C的碳奈米管絲陰極體的顯微鏡照片。 圖2A爲編號A的碳奈米管絲陰極體的場發射曲線。 圖2B爲編號B的碳奈米管絲陰極體的場發射曲線。 圖2C爲編號C的碳奈米管絲陰極體的場發射曲線。 200805414 一 【主要元件符號說明】 :· 無200805414 - IX. Description of the invention: ^ Technical Field of the Invention The present invention relates to a method for producing a carbon nanotube wire cathode body. [Prior Art] The broken nano tube wire is obtained from the array of broken nanotubes, and the US 7, 〇45,1〇8^6,957,993 specializes in the carbon nanotube tube_manufacturing method. The development of the post-nano official silk will promote the development of carbon neps. • The end face of the carbon nanotube wire has good field emission properties and can be used as a source of erbium emission electrons. However, the end morphology of the nanowire has a large randomness, and the influence of the end morphology on the field emission is large. Therefore, the field emission properties of different carbon nanotube filaments may vary greatly. In addition, the length of the carbon nanotube filament is not well controlled. Therefore, it is difficult to batch prepare cathode emitters with uniform field emission properties. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a method for manufacturing a carbon nanotube body, so that a cathode emitter having uniform field emission properties can be prepared in batches. A method for manufacturing a carbon nanotube filament cathode body, comprising the steps of: providing a carbon nanowire; obtaining a plurality of carbon nanotube filaments from the carbon nanotube filament, and using a rabbit nanotube The wire is adhered to one end of the wire; the carbon nanotube wire is burned in a flame to obtain a carbon nanotube wire cathode body. A plurality of carbon nanotube filaments obtained by the second step of the above method are sequentially repeated in the third and fourth steps to obtain a plurality of carbon nanotube filament cathode bodies. The length of the carbon nanotube body obtained by the above method and the morphology of the end portion 200805414 have a good conformity, and the field emission properties are also compared, and the post-nanotube wire cathode body with uniform batch manufacturing performance is obtained. . [Embodiment] Hereinafter, a method for manufacturing a carbon nanotube filament cathode body will be further described in detail with reference to the accompanying drawings, including the following steps: providing a carbon nanotube yarn; The carbon nanotube yarn obtains a plurality of carbon nanotube filaments; a piece of carbon nanotube filament is adhered to one end of the wire; the carbon nanotube filament is burned in a flame to obtain a carbon-zinc wire cathode body. The method of manufacturing the carbon nanotube filament cathode body of the embodiment of the present invention will now be described with reference to the accompanying drawings. "" Step 1: Provide a carbon nanotube wire. The carbon nanotube filament can be obtained by: providing a substrate; _ depositing a catalyst on the surface of the substrate; introducing a mixed gas of a carbon source gas and a shielding gas to grow the carbon nanotube array from the substrate; A carbon nanotube bundle segment including a plurality of carbon nanotube bundles is selected from the nanotube array, and the carbon nanotube bundle segments are stretched using a stretching tool to form the carbon nanotube filaments in the stretching direction. Wherein the substrate is a smooth and smooth substrate, the catalyst has a temperature difference of more than 50 ° C, and the partial pressure of the carbon source gas is less than 20%. For the production of carbon nanotube yarns, see U.S. Patent Nos. 7,045,108 and 6,957,993. Step 2·· Obtain a number of carbon nanotube filaments from the carbon nanotube filament. A number of carbon nanotube filaments were obtained from the nanowires by mechanical or non-mechanical methods. Mechanical methods refer to cutting with scissors, or cutting with a sharp blade. Non-mechanical methods refer to laser cutting, flame burning, and the like. The length of each segment of carbon nanotube wire can be controlled at will, and there is no precise requirement for the length. Step 3: Adhere a piece of carbon nanotube wire to one end of the wire. A piece of carbon nanotube wire can be adhered to one end of the wire by using a material such as silver glue. The metal as the support needs to be electrically conductive and thermally conductive, and has sufficient strength. Copper wire is used in this embodiment. w Step 4: The carbon nanotube filament is burned in a flame to obtain a carbon nanotube cathode body. One end of the wire to which the carbon nanotube wire is adhered is placed in a flame for baking, such as an alcohol lamp flame. At this time, the front end of each carbon nanotube wire will be burned in a high temperature flame, but due to the excellent thermal conductivity of the carbon nanotube, the carbon nanotube wire will have a certain length of carbon nanotube wire near the wire. save. This length is related to the temperature of the flame and the oxidizing atmosphere, the blood diameter of the carbon nanotube wire, and the diameter of the wire. When these conditions are fixed, the length of the carbon nanotube wire remaining after combustion is determined. In this embodiment, in the air, a carbon nanotube tube is fired at about 450 ° C, the diameter of the carbon nanotube wire is about 50 / zm, the wire is made of copper wire, and the diameter of the copper wire is about 600 / / m At this time, the carbon nanotube filament retained after combustion is about 0.5 mm in length. A plurality of carbon nanotube filaments obtained by the second step of the above method are sequentially repeated in the third and fourth steps to obtain a plurality of carbon nanotube filament cathode bodies. The three carbon nanotube filament cathode bodies produced by this method are numbered 8 200805414 A, B and C, respectively, and their micrographs are shown in Fig. ΙΑ, Fig. 1B and Fig. 1C, respectively. It can be seen from the figure that the length and end morphology of the three carbon nanotube filament cathode bodies obtained by the method have good consistency. The field emission curves corresponding to the three carbon nanotube cathode bodies A, B and C are shown in Fig. 2A, Fig. 2B and Fig. 2C, respectively. The abscissas of Figures 2A, 2B and 2C represent voltages, the sign is U, the unit is volts (V); the ordinate represents the current, the sign is I, and the unit is ampere (A). It can be seen from the figure that the field emission properties of the three carbon nanotubes are also consistent. The carbon nanotube wire cathode body produced by this method has good consistency and end morphology, and its field emission performance is relatively uniform, so it is suitable for mass production of carbon nanotube wire cathode body with uniform performance. In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or changes in accordance with the spirit of the present invention. It should be covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a photomicrograph of a carbon nanotube body of No. A. Figure 1B is a photomicrograph of a carbon nanotube body of No. B. Figure 1C is a photomicrograph of a carbon nanotube body of No. C. 2A is a field emission curve of a carbon nanotube body of No. A. 2B is a field emission curve of the carbon nanotube filament cathode body of No. B. 2C is a field emission curve of the carbon nanotube filament cathode body of No. C. 200805414 a [Description of main component symbols] :·