Direct growth of tungsten oxide nanorods from heated tungsten foils  

作　　者：QIN JingFang ZHANG GengMin XING YingJie 

机构地区：[1]Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics,Peking University,Beijing 100871,China [2]Academy for Advanced Interdisciplinary Studies,Peking University,Beijing 100871,China

出　　处：《Science China(Technological Sciences)》2012年第6期1503-1508,共6页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 61171023,61076057 and 61072025)

摘　　要：Tungsten oxide （W18O49） nanorods were grown by directly heating tungsten foils covered with potassium bromide （KBr） in low-pressure wet oxygen. The approach featured such advantages as convenient manipulation, low cost and rapid accessibility to high temperatures. A solid-liquid-solid （SLS） mechanism is believed to have dominated the growth process, in which the W18049 nanorods segregated from eutectic droplets of potassium tungstate and tungsten oxide. The ultraviolet photoelectron spectroscopy （UPS） analysis disclosed that the valence band maximum （VBM） of these nanorods was approximately 9 eV be- low the vacuum level. The feasibility of using the such-fabricated nanorods as field emitters was tested and the related mecha- nism was also discussed.

关 键 词：W18049 fast heating CVD field emission 

分 类 号：TQ136.13[化学工程—无机化工] TF821[冶金工程—有色金属冶金]