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Field emission from thick carbon nanotube film on Si substrate

A carbon nanotube (CNT) cathode for field emission display was fabricated by coating on Si substrate. The CNTs were obtained from catalytic decomposition of hydrocarbon. A paste mixture for coating was prepared by mixing CNTs, glass frits and organic binder. The paste mixture of well‐dispersed CNTs was coated on Si substrate and subsequently heat treated to fix the CNTs on the substrate and remove the organic binder. With this method we obtained a uniform, flat, thick, conductive CNT film that adhered tightly to the Si substrate. Measurements carried out using a diode structure reveal that the electron field emission of the CNT coating can be turned on with a field as low as 1.0–1.25 V µm−1, and an emission current density of 50 µA cm−2 at 5 V µm−1 can be attained. On increasing the proportion of glass frits, a gradual decrease in emission current is observed. When the sintering time is prolonged, the field emission of the thick CNT film is reduced. Copyright © 2004 John Wiley & Sons, Ltd.