Comparison of Field Emission Performance for Different Diameter Carbon Nanotubes Films

摘要

Three kinds of different diameter carbon nanotubes(CNTS) films deposited on aluminum sheets by electrophoretic deposition method. Scanning electron microscopy was used to observe the surface morphology of the films. The field emission properties of the films were tested by using a diode structure. The turn-on field for 8nm diameter CNTs film was 0.8V/ìm and the current density of 5200ìA/cm2 was obtained at 2.3V/ìm. While corresponding data for 15nm and 30nm CNTs films were 1.6V/ìm, 1.4V/ìm, and 2200ìA/cm2, 850ìA/cm~2 at 3.0V/ìm respectively. The deposited film with 8nm diameter CNTs appeared excellent emission properties.