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通过热蒸发反应沉积的方法制备了大面积的四针状ZnO纳米结构材料.四针状纳米结构具有细小的尖端尺寸,为六方纤锌矿晶体结构.在不同极间距下测试了样品的场发射性能,其开启电场约为3.7V/μm,并利用Fowler-Nordheim方程对场发射特征进行了分析.进一步采用在H2气氛中退火的方法优化了四针状纳米ZnO材料的场发射性能,降低了开启电压.研究结果表明,四针状纳米ZnO体现出较低的开启电压和高的发射电流密度,是具有广泛应用前景的冷阴极场发射材料.
Large-area four-needle ZnO nanostructured materials were prepared by thermal evaporation deposition.The four-needle nanostructures have a fine tip size and are hexagonal wurtzite crystal structures.The field emission of the samples was tested at different electrode spacings The field emission characteristics were analyzed by Fowler-Nordheim equation.The field emission properties of the four-needle ZnO nanocrystals were optimized by annealing in H2 atmosphere, Turn-on voltage.The results show that the four-needle ZnO nanoparticles exhibit lower turn-on voltage and higher emission current density, which is a promising candidate for cold cathode field emission materials.