Non-fully oxidized tungsten oxide（WO_（3-x）） nanostructures with controllable morphology were fabricated by adjusting the gas pressure in chemical vapor deposition.The comparative field emission（FE） measurements ...Non-fully oxidized tungsten oxide（WO_（3-x）） nanostructures with controllable morphology were fabricated by adjusting the gas pressure in chemical vapor deposition.The comparative field emission（FE） measurements showed that the obtained W_（18）O_（49） nanowires have excellent FE property.The turn-on field was 7.1 V/μm for 10μA/cm^2 and the observed highest current density was 4.05 mA/cm^2 at a field of 17.2 V/μm.Good electron emission reproducibility was also observed during thermal evaporation and desorption testing.展开更多
Patterned ZnO nanowires were successfully synthesized on ITO electrodes deposited on the glass substrate by using a simple thermal evaporation approach.The morphology,crystallinity and optical properties of ZnO nanowi...Patterned ZnO nanowires were successfully synthesized on ITO electrodes deposited on the glass substrate by using a simple thermal evaporation approach.The morphology,crystallinity and optical properties of ZnO nanowires were characterized by scanning electron microscopy,X-ray diffraction,energy dispersive X-ray and pho-toluminescence spectroscopy.Their field emission characteristics were also investigated.SEM images showed that the ZnO nanowires,with a diameter of 100-200 nm and length up to 5μm,were highly uniform and well distributed on the linear ITO electrodes.The field emission measurement indicated that patterned ZnO nanowire arrays have a turn-on field of 1.6 V/μm at current density of 1μA/cm~2 and a threshold field of 4.92 V/μm at current density of 1 mA/cm~2 at an emitter-anode gap of 700μm.The current density rapidly reached 2.26 mA/cm~2 at an applied field of 5.38 V/μm.The fluctuation of emission current was lower than 5%for 4.5 h.The low turn-on field,high current density and good stability of patterned ZnO nanowire arrays indicate that it is a promising candidate for field emission application.展开更多
基金supported by National Natural Science Foundation of China(Nos.61106073,60971003,60925003)the Key Laboratory of Photochemical Conversion and Optoelectronic Materials,TIPC,CAS(No.PCOM201021)
文摘Non-fully oxidized tungsten oxide（WO_（3-x）） nanostructures with controllable morphology were fabricated by adjusting the gas pressure in chemical vapor deposition.The comparative field emission（FE） measurements showed that the obtained W_（18）O_（49） nanowires have excellent FE property.The turn-on field was 7.1 V/μm for 10μA/cm^2 and the observed highest current density was 4.05 mA/cm^2 at a field of 17.2 V/μm.Good electron emission reproducibility was also observed during thermal evaporation and desorption testing.
基金supported by the National High Technology Research and Development Program for Advanced Materials of China(No. 2008AA03A313)the Technology Projects of Department of Education,Fujian Province,China(Nos.JA09017,JA11014)
文摘Patterned ZnO nanowires were successfully synthesized on ITO electrodes deposited on the glass substrate by using a simple thermal evaporation approach.The morphology,crystallinity and optical properties of ZnO nanowires were characterized by scanning electron microscopy,X-ray diffraction,energy dispersive X-ray and pho-toluminescence spectroscopy.Their field emission characteristics were also investigated.SEM images showed that the ZnO nanowires,with a diameter of 100-200 nm and length up to 5μm,were highly uniform and well distributed on the linear ITO electrodes.The field emission measurement indicated that patterned ZnO nanowire arrays have a turn-on field of 1.6 V/μm at current density of 1μA/cm~2 and a threshold field of 4.92 V/μm at current density of 1 mA/cm~2 at an emitter-anode gap of 700μm.The current density rapidly reached 2.26 mA/cm~2 at an applied field of 5.38 V/μm.The fluctuation of emission current was lower than 5%for 4.5 h.The low turn-on field,high current density and good stability of patterned ZnO nanowire arrays indicate that it is a promising candidate for field emission application.
