Electron field emission in air from 5H-BN micro-cone films prepared by plasma-assisted laser CVD

研究了激光辅助等离子体化学气相沉积(CVD)制备的spt；lt；3-&gt；结合的5H-BN薄膜的电子场发射特性。他们的功绩主要源于三个因素。第一种是由于化学吸附的氢原子和氮原子形成的电偶极矩而产生的表面效应，这有利于电子场发射。第二个是新晶体结构中的有效功函数，这种新的晶体结构是spt；lt；3-gt；键合的BN多型体。三是微锥的表面形态，由于局部电场的几何增强，有利于发射。这些因素的综合作用使得空气中的电子场发射得以实现。用这种方法成功地制备了sp^&lt；3-&gt；键合BN的新结构，建立了理解多型结构稳定性的新的图解分析方法，并用于这些BN薄膜的制备。

The characteristics of electron field emission in sp^<3->bonded 5H-BN films prepared by laser-assisted plasma CVD wer studied. Their merits originated from mainly three factors. The first is the surface effect due to the electric dipole moment formed by the chemisorbed hydrogena and nitrogen atoms, which favors the electron field emission. The second is the effective work function inherent in the new crystal structure of the sp^<3->bonded BN polytypic forms. The third is the surface morphology made of micro-cones that favored the emission due to the geometrical enhancement of the local electric field. The combinatorial effect of these factors enabled the electron field emission evem in the air. The new structures of sp^<3->bonded BN were successfully prepared by this method and the new analytic method using a diagram for understanding the strcutural stability of polytypes was established and utilized for the fabrication of these BN films.