Qiong Li

Synthesis and field emission of four kinds of ZnO nanostructures: nanosleeve-fishes, radial nanowire arrays, nanocombs and nanoflowers

Four different hierarchical ZnO nanostructures, including nanosleeve-fishes, radial nanowire arrays, nanocombs and nanoflowers, have been successfully fabricated through thermal chemical vapour deposition by adjusting the source temperature and the gas flow rate. Field emission measurements of these nanostructures showed a high emission current density and a low turn-on field of 1.3, 1.9, 2.5 and 3.4 V μm−1 in sequence, which is comparable to that of one-dimensional ZnO nanostructures and carbon nanotubes. The good performance for field emission makes the hierarchical ZnO nanostructures promising candidates for further applications in field emission microelectronic devices.

Electron field emission from soluble carbon nanotube films treated by hydrogen plasma

Large-scaled and homogeneous multi-wall carbon nanotube (MWNT) films have been fabricated using the soluble octadecylamine (ODA) modified multi-wall carbon nanotubes at room temperature by a spin-coating method. The characterization, by means of electron microscopy and micro-Raman spectroscopy, shows that the surfaces of MWNTs-ODA with hydrogen plasma treatment are covered by the carbon nanoparticles. The field emission test indicates that the treated MWNTs-ODA film has low turn-on emission field of 0.5 V/μm at 0.1 μA/cm2 of current density, high-emission luminescent site density of about 104/cm2.

Soluble carbon nanotube films treated using a hydrogen plasma for uniform electron field emission

Abstract Large-scaled and homogeneous multi-wall carbon nanotube (MWNT) films have been fabricated using the soluble octadecylamine modified multi-wall carbon nanotubes at room temperature by spin-coating method. The characterization, by scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and micro-Raman spectroscopy, shows that the surfaces of the carbon nanotubes with hydrogen plasma (HP) treatment are covered with carbon nanoparticles. Field emission tests indicate that the treated MWNT films have a low turn-on emission field of 0.5 V/μm (at 0.1 μA/cm 2 ), high emission site density (ESD) of approximately 10 4 cm −2 and high emission current density of 10 mA/ cm 2 (at 7.5V/μm). The conversion mechanism of the treated MWNT structure and the reason of changing the field emission characteristic of the MWNT are discussed.