Preparation and Field Emission Properties of Titanium Polysulfide Nanobelt Films  

作　　者：Xing Cai Wu You Rong Tao Qi Xiu Gao 

机构地区：[1]School of Chemistry and Chemical Engineering,and Key Laboratory of Mesoscopic Chemistry of Ministry of Education,NanjingUniversity,Nanjing 210093,China

出　　处：《Nano Research》2009年第7期558-564,共7页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(No.20671050);National Basic Research Program of China(973 Program,No.2007CB936302).

摘　　要：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.

关 键 词：NANOWIRE film titanium sulfide chemical vapor-transport field emission 

分 类 号：TB3[一般工业技术—材料科学与工程]