TY - JOUR
T1 - Tungsten oxide tree-like structures
AU - Zhu, Yan Qiu
AU - Hu, Weibing
AU - Hsu, Wen Kuang
AU - Terrones, Mauricio
AU - Grobert, Nicole
AU - Hare, Jonathan P.
AU - Kroto, Harold W.
AU - Walton, David R.M.
AU - Terrones, Humberto
N1 - Funding Information:
We thank the Royal Society (YQZ, WKH, MT), the DERA (NG), Japanese Fine Ceramic Center (NG), Conacyt-México (HT), and the EPSRC for financial support. We are grateful to S. Tehuacanero, R. Hernández, P. Mexı́a, R. Guardián and L. Rendón (UNAM), and to W.Z. Li, J. Thorpe and D. Randall (Sussex) for assistance with XRD, TEM and SEM facilities.
PY - 1999/8/20
Y1 - 1999/8/20
N2 - An interesting micrometer scale tree-like structure has been generated by heating a W foil, partly covered by a SiO2 plate, in an Ar atmosphere at ca. 1600°C. Upon sonication, the trees are broken into nanoneedles (ca. 5-50 nm wide and 20-200 nm long) and planar polyhedral nanoparticles (ca. 10-50 nm cross-section). Structural analysis, using ED, EDX, XRD, and HRTEM, showed that: (1) the trees consist of well-crystallised WOx phases (x=0-3); (2) the nanoneedles are composed mainly of monoclinic W18O49 phases; and (3) the nanoparticles consist primarily of WO3. The tree growth is thought to arise from the intrinsic crystalline feature of WOx, the planar defect or the shear structure of which is responsible for the breakdown of the trees.
AB - An interesting micrometer scale tree-like structure has been generated by heating a W foil, partly covered by a SiO2 plate, in an Ar atmosphere at ca. 1600°C. Upon sonication, the trees are broken into nanoneedles (ca. 5-50 nm wide and 20-200 nm long) and planar polyhedral nanoparticles (ca. 10-50 nm cross-section). Structural analysis, using ED, EDX, XRD, and HRTEM, showed that: (1) the trees consist of well-crystallised WOx phases (x=0-3); (2) the nanoneedles are composed mainly of monoclinic W18O49 phases; and (3) the nanoparticles consist primarily of WO3. The tree growth is thought to arise from the intrinsic crystalline feature of WOx, the planar defect or the shear structure of which is responsible for the breakdown of the trees.
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U2 - 10.1016/S0009-2614(99)00732-0
DO - 10.1016/S0009-2614(99)00732-0
M3 - Article
AN - SCOPUS:0000385860
SN - 0009-2614
VL - 309
SP - 327
EP - 334
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 5-6
ER -