TiS_(3) nanobelt films,with widths of about 0.112μm,thickness of about 20250 nm,and lengths of up to 200μm,have been grown on Ti substrates by a surface-assisted chemical-vapor-transport at 450°C for 8 h.The TiS_(3) nanobelt films were converted into TiS_(1.71) nanobelt films by pyrolysis in a vacuum at 600°C for 2 h.The work functions of the two films 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 field required to produce a current density of 10μA/cm^(2))were about 1.0 and 0.9 V/μm,respectively,whereas the threshold fields(defined as the electric field required to produce a current density of 1 mA/cm^(2))were about 5.6 and 4.0 V/μm,respectively.These data reveal that both materials have potential applications in field emission devices.
Due to the significant importance in many applications,the thermal stability of hollow gold nano-particles has been studied theoretically by using ultra-large molecular dynamics simulation. By changing the nano-particle size while keeping the aspect ratio constant,it was found that the large gold nano-particle has better thermal stability than the small ones.
