Effect of heat treatment of diamond films on field emission property

We have investigated structural and electrical properties of the undoped diamond films prepared by hot filament CVD. It is found that after annealing the as-grown diamond films the resistivity increased significantly due to the dehydrogenation confirmed by FTIR. The field emission property of the as-grown diamond films degraded significantly after annealed in nitrogen ambient. The reason for the degradation is discussed by comparing hydrogen bonding with resistivity.