ZnO nanoneedles with tip surface perturbations: Excellent field emitters

ZnO nanoneedles were prepared on a silicon wafer through a chemical vapor deposition. The diameters of the needle tips were in a range of 20–50 nm. High-resolution transmission electron microscopy revealed that the nanoneedles were single crystals growing along the [001] direction and exhibiting multiple tip surface perturbations, just 1–3 nm in dimension. Field-emission measurements on the prepared nanostructures showed fairly low turn-on and threshold fields of 2.5 and 4.0 V/μm, respectively. The nanosize perturbations on the nanoneedle tips are assumed to cause such excellent field-emission performance.

[1]  J. Y. Lao,et al.  Field-emission studies on thin films of zinc oxide nanowires , 2003 .

[2]  H. Yan,et al.  ZnO Nanoribbon Microcavity Lasers , 2003 .

[3]  Jun Chen,et al.  Large‐Area Nanowire Arrays of Molybdenum and Molybdenum Oxides: Synthesis and Field Emission Properties , 2003 .

[4]  Dmitri Golberg,et al.  Quasi‐Aligned Single‐Crystalline W18O49 Nanotubes and Nanowires , 2003 .

[5]  Bin Xiang,et al.  Efficient field emission from ZnO nanoneedle arrays , 2003 .

[6]  Jun Jiao,et al.  ZnO nanowires formed on tungsten substrates and their electron field emission properties , 2003 .

[7]  Tae Jae Lee,et al.  Field emission from well-aligned zinc oxide nanowires grown at low temperature , 2002 .

[8]  Chang Hoon Choi,et al.  Tungsten nanowires and their field electron emission properties , 2002 .

[9]  Yoshio Bando,et al.  ZnO nanobelts grown on Si substrate , 2002 .

[10]  N. Xu,et al.  Needle-shaped silicon carbide nanowires: Synthesis and field electron emission properties , 2002 .

[11]  P. Watts,et al.  Field emission from nonaligned carbon nanotubes embedded in a polystyrene matrix , 2002 .

[12]  John T. L. Thong,et al.  High-current field emission from a vertically aligned carbon nanotube field emitter array , 2001 .

[13]  Yiying Wu,et al.  Room-Temperature Ultraviolet Nanowire Nanolasers , 2001, Science.

[14]  Sungho Jin,et al.  In situ-grown carbon nanotube array with excellent field emission characteristics , 2000 .

[15]  R. Fowler,et al.  Electron Emission in Intense Electric Fields , 1928 .