Efficient field emission from chemically grown inexpensive ZnO nanoparticles of different morphologies

摘要

Efficient field electron emission from ZnO nanoparticles synthesized by a chemical route has been observed. Nanostructures were synthesized in three different morphologies, namely needles, rods, and spheres. The field emission studies carried out in diode configuration show that the onset fields required to draw a current density of approx 0.1 mu A cirT~( -2 )from the needles, rods, and spherical particles were 2.3, 2.5, and 3.5 V mu m~(-1), respectively. The field emission current and applied field follow the Fowler-Nordheim (F-N) relationship. The observed results indicate that the field emission characteristics of chemically grown ZnO nanostructures are at par with those reported for solid-vapour phase grown ZnO nanostructures.