PREPARATION OF NANOMETER ZINC OXIDE BY EVAPORATION METHOD

Nanometer ZnO particles were synthesized by evaporating of zinc powders of averageparticle size of 370μm studied by XRD, TEM and electron diffraction. The particleswere formed by the oxidation of evaporated zinc vapor in the air. It was found that the particles range from 70 to 100nm in average particle size. The effect of experimental parameters was investigated, the increase of the air flow-rates reduced the average particle size, while increasing the evaporation temperature and the amount of metal charged increased the average particle size. TEM of the particles collected showed that the crystal habits of particles have a tetrapod-like of wurtzite structure consists of four needle crystals. It was found by electron diffraction that all particles were single crystal.

四针状纳米氧化锌的制备及其场致发射特性的研究

对利用高温气相氧化法制备四针状纳米氧化锌进行了研究,实验表明:制备炉的温度对样品的性能影响较大,温度低于800℃,短时间内得不到明显的反应产物,温度高于1 000℃,白雾状产物也有所下降,最佳反应温度约为900℃。样品具有优良的场发射特性,开启电场仅为1.6 V/μm。获得1.0 mA/cm2的电流密度也只需要4.5 V/μm的电场。