Field emission from thick carbon nanotube film on Si substrate

Abstract

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.

Pressure-sensitive properties and microstructure of carbon nanotube reinforced cement composites

“…The high sensitivity for PCNT and SPCNT is due to: (1) the electric conductivity of CNTs varies with stress (According to Tombler [13], the resistance of carbon nanotubes will increase 100 times when strain changes from 0.0% to 3.2% under tensile loading); (2) the number of contact points of CNTs increase with the increase of loading, and the more the contact points are the lower electric resistivity will be; (3) the effect of field emission on electric resistivity varies with stress. CNTs have a strong field emission property under electric field [14][15][16][17]. The shorter is the space among CNTs, the higher the field emission current density of the composites will be.…”

Integration of single-walled carbon nanotubes into polymer films by thermo-compression

“…Therefore, several methods, such as dry printing [19] and electrical or thermal precipita- tion [20] have been proposed for transferring nanotubes onto plastics. Nanotubes can also be suspended in solution and sprayed [21] or spin coated onto, e.g., silicon wafers [22], however, such techniques require additional processing steps and equipment.…”