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5051234 
Journal Article 
Fabrication and temperature-dependent field-emission properties of bundlelike VO2 nanostructures 
Yin, H; Luo, M; Yu, K; Gao, Y; Huang, R; Zhang, Z; Zeng, M; Cao, C; Zhu, Z 
2011 
1 
ACS Applied Materials & Interfaces
ISSN: 1944-8244
EISSN: 1944-8252 
3 
6 
2057-2062 
English 
21634372 
WOS:000291781800039 
Bundlelike VO(2)(B) nanostructures were synthesized via a hydrothermal method, and VO(2)(M(1)/R) nanobundles were obtained after a heat-treatment process. Structural characterization shows that these nanobundles are self-assembled by VO(2) nanowires, and VO(2)(M(1)/R) nanobundles have better crystallinity. Temperature-dependent field-emission (FE) measurement indicates that FE properties of these two phases of nanobundles can both be improved by increasing the ambient temperature. Moreover, for the VO(2)(M(1)/R) nanobundles, their FE properties are also strongly dependent on the temperature-induced metal-insulator transitions process. Compared with poor FE properties found in the insulating phase, FE properties were significantly improved by increasing the temperature, and about a three-orders-of-magnitude increasing of the emission current density has been observed at a fixed field of 6 V/μm. Work function measurement and density-functional theory calculations indicated that the decrease of work function with temperature is the main reason that caused the improvement of FE properties. These characteristics make VO(2)(M(1)/R) a candidate material for application of new type of temperature-controlled field emitters, whose emission density can be adjusted by ambient temperature.