Figure 5.

aTypical field-emission current density–applied field (J–E) curves of the α-Fe2O3nanoflakes films before and after 100 W Ar plasma treatment.Insetshows theF–Nplots (ln(J/E2) vs. 1/E) accordingly, which exhibits a good linear dependence (solid line is the fitting result).bLong-term stability measurement of field-emission property of nanoflake films after Ar plasma treatment

Zheng et al. Nanoscale Research Letters 2009 4:1115-1119   doi:10.1007/s11671-009-9363-1