TY - JOUR
T1 - Synthesis of tungsten oxide tapered needles with nanotips
AU - Wang, Shiliang
AU - He, Yuehui
AU - Zou, Jin
AU - Cao, Peng
AU - Jiang, Yao
AU - Huang, Baiyun
AU - Liu, C. T.
AU - Liaw, P. K.
PY - 2007/5/15
Y1 - 2007/5/15
N2 - Tungsten oxide tapered needles with nanotips were synthesized on a large scale by reacting tungsten nanopowders with hydrous nickel nitrate in hydrogen atmosphere. The resultant tungsten oxide needles have lengths more than 100 μm, root diameters of several hundred nanometers and tip diameters of several nanometers, showing a perfectly axisymmetric configuration. HRTEM and SAED analyses showed that the synthesized tungsten oxide tapered needles have a single-crystalline structure with growth direction of [0 1 0]. The effects of the experimental conditions (the ratio between tungsten and hydrous nickel nitrate, the size of tungsten powders, and the reaction atmosphere) on the morphology of the products were systematically investigated. It was found that tungsten oxide nanowires, submicro-/micro-whiskers and microtubules could be facilely obtained under different experimental conditions. The unique configuration and the single-crystal structure of the tapered needles may make them a potential candidate for field emitters and probing tips. © 2007 Elsevier B.V. All rights reserved.
AB - Tungsten oxide tapered needles with nanotips were synthesized on a large scale by reacting tungsten nanopowders with hydrous nickel nitrate in hydrogen atmosphere. The resultant tungsten oxide needles have lengths more than 100 μm, root diameters of several hundred nanometers and tip diameters of several nanometers, showing a perfectly axisymmetric configuration. HRTEM and SAED analyses showed that the synthesized tungsten oxide tapered needles have a single-crystalline structure with growth direction of [0 1 0]. The effects of the experimental conditions (the ratio between tungsten and hydrous nickel nitrate, the size of tungsten powders, and the reaction atmosphere) on the morphology of the products were systematically investigated. It was found that tungsten oxide nanowires, submicro-/micro-whiskers and microtubules could be facilely obtained under different experimental conditions. The unique configuration and the single-crystal structure of the tapered needles may make them a potential candidate for field emitters and probing tips. © 2007 Elsevier B.V. All rights reserved.
KW - A1. Crystal morphology
KW - B1. Nanotips
KW - B1. Oxides
UR - http://www.scopus.com/inward/record.url?scp=34247277707&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-34247277707&origin=recordpage
U2 - 10.1016/j.jcrysgro.2006.11.342
DO - 10.1016/j.jcrysgro.2006.11.342
M3 - RGC 21 - Publication in refereed journal
SN - 0022-0248
VL - 303
SP - 574
EP - 579
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
IS - 2
ER -