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

研究<3->了激光辅助等离子体化学气相沉积法制备的5 H-BN薄膜的场致电子发射特性。它们的优点主要来自三个因素。第一种是由于氢原子和氮原子化学吸附形成的电偶极矩产生的表面效应，有利于电子场发射。第二个是sp2键合BN多型形式的新晶体结构中固有的有效功函数<3->。第三种是由微锥构成的表面形貌，由于局部电场的几何增强而有利于发射。这些因素的综合作用使电子场发射现象在空气中得以发生。用<3->这种方法成功地制备出了新型结构的sp键BN薄膜，并建立了一种用图解法分析多型体结构稳定性的新方法，用于制备这种BN薄膜。

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.