| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a cathode material capable of uniformly emitting electrons from a large area with a low voltage by irradiating a polymer material to be radiation crosslinked with a corpuscular beam such as heavy ion to crosslink it, and baking the resulting polymer material after removing the unreacted part to form needle-like projections having a specified dimension on the material surface. SOLUTION: Needle-like projections having a diameter of about 0.01-several tensμm and a length of 0.5-several hundredsμm are formed on the surface of a material in 100 piece/mm<2> or more. A cyclotron or tandem type high energy accelerator is used to emit a corpuscular beam. A polymer material has a flat form, and it is irradiated in an irradiating chamber having a vacuum degree of 5×10<-6> Torr or less. After the polymer material is scanned and irradiated with a heavy ion beam of about 5 mmϕand a current of 10 nA, it is heated to terminate the crosslinking reaction, and cleaned with a solvent for dissolving the unreacted molecules. The resulting product is dried, put in a baking furnace and heated in an inert gas to form a conductive field emission type cold cathode material.
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