Preparation and field emission properties of titanium polysulfide nanobelt films
Nanowire, film, titanium sulfi de, chemical vapor-transport, field emission
TiS3 nanobelt fi lms, with widths of about 0.1 12 μm, thickness of about 20 250 nm, and lengths of up to 200 μm, have been grown on Ti substrates by a surface-assisted chemical-vapor-transport at 450 °C for 8 h. The TiS3 nanobelt fi lms were converted into TiS1.71 nanobelt fi lms by pyrolysis in a vacuum at 600 °C for 2 h. The work functions of the two fi lms were determined by ultraviolet photoelectron spectroscopy measurements to be 4.60 and 4.44 eV, respectively. Preliminary field emission experiments using the nanostructures as cold electron cathodes showed that both materials gave significant emission currents. The turn-on fields (defined as the electric fi eld required to produce a current density of 10 μA/cm2) were about 1.0 and 0.9 V/μm, respectively, whereas the threshold fi elds (defi ned as the electric fi eld required to produce a current density of 1 mA/cm2) were about 5.6 and 4.0 V/μm, respectively. These data reveal that both materials have potential applications in fi eld emission devices.
Tsinghua University Press
Xing Cai Wu,You Rong Tao,Qi Xiu Gao, Preparation and field emission properties of titanium polysulfide nanobelt films. NanoRes.2009, 2: 558-564