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The electron emission properties from carbon nanocomposite films deposited at elevated temperatures using pulsed laser deposition techniques have been studied.By using both Fowler-Nordhiem and WentzeI-Kramers-Brillouin approximation for electron tunneling, changes of the effective barrier height were studied.The barrier height ratios were found to have a ratio of φ100: φ400: φ7,00 =1.5∶ 1.4∶1 for films deposited at 100℃, 400℃ and 700℃ respectively, thus showing that barrier height was significantly reduced at high deposition temperatures.High resolution XPS and TEM showed that both the formation of embedded nano-graphite clusters and an increase in the sp2bonds were the main factors that enhanced electron emission.