Tungsten oxide nanostructures: controllable growth and field emission

Non-fully oxidized tungsten oxide (WO3x / nanostructures with controllable morphology were fabri- cated by adjusting the gas pressure in chemical vapor deposition. The comparative field emission (FE) measure- ments showed that the obtained W18O49 nanowires have excellent FE property. The turn-on field was 7.1 V/ m for 10 A/cm 2 and the observed highest current density was 4.05 mA/cm 2 at a field of 17.2 V/ m. Good electron