Formation and photoluminescence properties of boron nanocones

This paper reports that a simple chemical vapour deposition methodhas been adopted to fabricate large scale, high density boronnanocones with thermal evaporation of B/Bboron nanocones, chemical vapourdeposition, photoluminescenceProject supported in part by theNational 863 (Grant No 2007AA03Z305) and 973 (Grant No 2007CB935503)Projects, the National Science Foundation of China (Grant NosU0734003 and 60571045), and ChinaPostdoctoral Science Foundation.6140M, 8115H, 7855CThis paper reports that a simple chemical vapour deposition methodhas been adopted to fabricate large scale, high density boronnanocones with thermal evaporation of B/Bboron nanocones, chemical vapourdeposition, photoluminescenceProject supported in part by theNational 863 (Grant No 2007AA03Z305) and 973 (Grant No 2007CB935503)Projects, the National Science Foundation of China (Grant NosU0734003 and 60571045), and ChinaPostdoctoral Science Foundation.6140M, 8115H, 7855CThis paper reports that a simple chemical vapour deposition methodhas been adopted to fabricate large scale, high density boronnanocones with thermal evaporation of B/Bboron nanocones, chemical vapourdeposition, photoluminescenceProject supported in part by theNational 863 (Grant No 2007AA03Z305) and 973 (Grant No 2007CB935503)Projects, the National Science Foundation of China (Grant NosU0734003 and 60571045), and ChinaPostdoctoral Science Foundation.6140M, 8115H, 7855CThis paper reports that a simple chemical vapour deposition methodhas been adopted to fabricate large scale, high density boronnanocones with thermal evaporation of B/B$_{2}$O$_{3}$ powdersprecursors in an Ar/H$_{2}$ gas mixture at the synthesis temperatureof 1000--1200$^{circ}$C. The lengths of boron nanocones are severalmicrometres, and the diameters of nanocone tops are in a range of50--100,nm. transmission electron microscopy and selected areaelectron diffraction indicate that the nanocones are singlecrystalline $alpha $-tetragonal boron. The vapour--liquid--solidmechanism is the main formation mechanism of boron nanocones. Onebroad photoluminescence emission peak at the central wavelength ofabout 650 nm is observed under the 532 nm light excitation. Boronnanocones with good photoluminescence properties are promisingcandidates for applications in optical emitting devices.