Tower-like ZnO nanorod (ZNR) bundles were grown on freestanding diamond (FSD) wafers by a low-temperature hydrothermal method without any catalysts, and the corresponding electron field emission property was investigated. The structural characterizations disclosed that these tower-like bundles were composed of single crystalline ZNRs with hexagonal wurtzite structure. They grew perpendicularly to each crystal planes of the diamond grains. Different hydrothermal reaction times (e.g., 1.5, 3, 6, 8 h) were carried out to investigate the morphology features of ZNRs grown on the growth surface of FSD wafers. The ZNR bundles with a growth time of 6 h showed the highest crystallinity and aspect ratio. Such ZNR bundles/FSD hybrid exhibited a high emission current density of 0.2 mA at an applied field of 11.8 V/μm and a reduced turn-on field of 6.8 V/μm. The field enhancement factor β was calculated to be ~4979 based on the Fowler-Nordheim theory. The geometry and structure of polycrystalline diamond were responsible for the formation of ZNR bundles and the high β-value.

在没有任何催化剂的情况下，通过低温水热法将塔状ZnO纳米棒（ZNR）束生长在独立式金刚石（FSD）晶片上，并研究了相应的电子场发射特性。结构特征表明，这些塔状束由具有六方纤锌矿结构的单晶ZNR组成。它们垂直于金刚石晶粒的每个晶面生长。进行了不同的水热反应时间（例如1.5、3、6、8小时）以研究在FSD晶圆生长表面上生长的ZNR的形态特征。ZNR束的生长时间为6小时，显示出最高的结晶度和长宽比。这样的ZNR束/ FSD杂化物表现出高的发射电流密度在11.8 V /μm的施加电场和6.8 V /μm的减小的导通电场下为0.2 mA。根据Fowler-Nordheim理论，场增强因子β计算为〜4979。的几何形状和结构的多晶金刚石负责ZNR束的形成和高β -值。