Investigation on Field Emission Performance of Zinc Oxide Nanocomposites
Zinc oxide nanocomposites are prepared using a two-step method.Firstly,ZnO nanorod ar-rays are grown on a silicon substrate by a low-temperature hydrothermal method.Then three types of zinc oxide nanocomposites are obtained using electrophoresis method.All products are characterized by SEM,XRD,EDS,XPS,and finally the field emission performances of the products are investigated.The results of XRD,EDS,and XPS characterizations indicate that the prepared products are Al2O3-ZnO,MgO-ZnO,and CuO-ZnO nanocomposites.Compared with pristine ZnO nanorods,the three ZnO nanocomposite sam-ples all have lower turn on fields.The MgO-ZnO nanocomposite sample exhibits the best field emission performance,with a turn-on field of 4.7 V/μm.The turn-on fields of the four samples,from low to high,are as follows:MgO-ZnO<Al2O3-ZnO<CuO-ZnO<ZnO.The results suggest that the construction of nanocomposites can effectively improve the field emission performance of ZnO nanorods.
Field emissionZnO nanorodsNanocomposite materialHydrothermal methodElectro-phoresis
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