Method for enhancing homogeneity of carbon nanotube electron emission source made by electrophoresis deposition

Abstract

A method for enhancing the homogeneity of carbon nanotube electron emission source which is manufactured using electrophoresis deposition. The method includes the following steps. First, a semi-manufactured cathode structure is prepared. Then, the cathode structure and the metallic plate are connected to the electrophoresis electrodes. After that, the side of the cathode structure to be electrophoresis deposited is kept a fixed distance in parallel with the metallic plate. Then, the electrophoresis deposition is performed to the semi-manufactured cathode structure by placing the combination into the solution of the electrophoresis tank. Later, an electric field is formed from a direct current pulse voltage of a power supply. In this manner, the carbon nanotubes are deposited on the cathode electrode to form the electron emission source. After the deposition process of the cathode structure is completed, the combination is baked with a low temperature so as to remove the residual water solution on the cathode structure. Meanwhile, the indium chloride charger and the electrolyte hydroxide ions react to form indium hydroxide. Next, a sintering process is performed for re-oxidating the indium hydroxide on the cathode electrode layer back to indium oxide. Consequently, the electron conductivity of the carbon nanotubes and the cathode electron layer is enhanced.

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