Tungsten oxide tree-like structures

Yan Qiu Zhu; Weibing Hu; Wen Kuang Hsu; Mauricio Terrones; Nicole Grobert; Jonathan P. Hare; Harold W. Kroto; David R.M. Walton; Humberto Terrones

doi:10.1016/S0009-2614(99)00732-0

Tungsten oxide tree-like structures

Yan Qiu Zhu, Weibing Hu, Wen Kuang Hsu, Mauricio Terrones, Nicole Grobert, Jonathan P. Hare, Harold W. Kroto, David R.M. Walton, Humberto Terrones

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Abstract

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 WO_x 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 WO_x, the planar defect or the shear structure of which is responsible for the breakdown of the trees.

Original language	English (US)
Pages (from-to)	327-334
Number of pages	8
Journal	Chemical Physics Letters
Volume	309
Issue number	5-6
DOIs	https://doi.org/10.1016/S0009-2614(99)00732-0
State	Published - Aug 20 1999

All Science Journal Classification (ASJC) codes

General Physics and Astronomy
Physical and Theoretical Chemistry

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@article{a2693174add14421939800659f10e32a,

title = "Tungsten oxide tree-like structures",

abstract = "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.",

author = "Zhu, {Yan Qiu} and Weibing Hu and Hsu, {Wen Kuang} and Mauricio Terrones and Nicole Grobert and Hare, {Jonathan P.} and Kroto, {Harold W.} and Walton, {David R.M.} and Humberto Terrones",

note = "Funding Information: We thank the Royal Society (YQZ, WKH, MT), the DERA (NG), Japanese Fine Ceramic Center (NG), Conacyt-M{\'e}xico (HT), and the EPSRC for financial support. We are grateful to S. Tehuacanero, R. Hern{\'a}ndez, P. Mex{\'ı}a, R. Guardi{\'a}n and L. Rend{\'o}n (UNAM), and to W.Z. Li, J. Thorpe and D. Randall (Sussex) for assistance with XRD, TEM and SEM facilities.",

year = "1999",

month = aug,

day = "20",

doi = "10.1016/S0009-2614(99)00732-0",

language = "English (US)",

volume = "309",

pages = "327--334",

journal = "Chemical Physics Letters",

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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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Tungsten oxide tree-like structures

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