Stoichiometry engineering of monoclinic to rutile phase transition in suspended single crystalline vanadium dioxide nanobeams

Shixiong Zhang; In Soo Kim; Lincoln J. Lauhon

doi:10.1021/nl103925m

Stoichiometry engineering of monoclinic to rutile phase transition in suspended single crystalline vanadium dioxide nanobeams

Shixiong Zhang, In Soo Kim, Lincoln J. Lauhon

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

158 Scopus citations

Abstract

Coexisting monoclinic M₁ (insulating) and rutile (metallic) domains were observed in free-standing vanadium dioxide nanobeams at room temperature. Similar domain structures have been attributed to interfacial strain, which was not present here. Annealing under reducing conditions indicated that a deficiency of oxygen stabilizes the rutile phase to temperatures as low as 103 K, which represents an unprecedented suppression of the phase transition by 238 K. In a complementary manner, oxygen-rich growth conditions stabilize the metastable monoclinic M₂ and triclinic T (or M₃) phases. A pseudophase diagram with dimensions of temperature and stoichiometry is established that highlights the accessibility of new phases in the nanobeam geometry.

Original language	English (US)
Pages (from-to)	1443-1447
Number of pages	5
Journal	Nano letters
Volume	11
Issue number	4
DOIs	https://doi.org/10.1021/nl103925m
State	Published - Apr 13 2011

Keywords

Vanadium dioxide
defects
oxygen deficiency
stoichiometry
structural phase transition

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Mechanical Engineering
Bioengineering
General Materials Science

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10.1021/nl103925m

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title = "Stoichiometry engineering of monoclinic to rutile phase transition in suspended single crystalline vanadium dioxide nanobeams",

abstract = "Coexisting monoclinic M1 (insulating) and rutile (metallic) domains were observed in free-standing vanadium dioxide nanobeams at room temperature. Similar domain structures have been attributed to interfacial strain, which was not present here. Annealing under reducing conditions indicated that a deficiency of oxygen stabilizes the rutile phase to temperatures as low as 103 K, which represents an unprecedented suppression of the phase transition by 238 K. In a complementary manner, oxygen-rich growth conditions stabilize the metastable monoclinic M2 and triclinic T (or M3) phases. A pseudophase diagram with dimensions of temperature and stoichiometry is established that highlights the accessibility of new phases in the nanobeam geometry.",

keywords = "Vanadium dioxide, defects, oxygen deficiency, stoichiometry, structural phase transition",

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T1 - Stoichiometry engineering of monoclinic to rutile phase transition in suspended single crystalline vanadium dioxide nanobeams

AU - Zhang, Shixiong

AU - Kim, In Soo

AU - Lauhon, Lincoln J.

PY - 2011/4/13

Y1 - 2011/4/13

N2 - Coexisting monoclinic M1 (insulating) and rutile (metallic) domains were observed in free-standing vanadium dioxide nanobeams at room temperature. Similar domain structures have been attributed to interfacial strain, which was not present here. Annealing under reducing conditions indicated that a deficiency of oxygen stabilizes the rutile phase to temperatures as low as 103 K, which represents an unprecedented suppression of the phase transition by 238 K. In a complementary manner, oxygen-rich growth conditions stabilize the metastable monoclinic M2 and triclinic T (or M3) phases. A pseudophase diagram with dimensions of temperature and stoichiometry is established that highlights the accessibility of new phases in the nanobeam geometry.

AB - Coexisting monoclinic M1 (insulating) and rutile (metallic) domains were observed in free-standing vanadium dioxide nanobeams at room temperature. Similar domain structures have been attributed to interfacial strain, which was not present here. Annealing under reducing conditions indicated that a deficiency of oxygen stabilizes the rutile phase to temperatures as low as 103 K, which represents an unprecedented suppression of the phase transition by 238 K. In a complementary manner, oxygen-rich growth conditions stabilize the metastable monoclinic M2 and triclinic T (or M3) phases. A pseudophase diagram with dimensions of temperature and stoichiometry is established that highlights the accessibility of new phases in the nanobeam geometry.

KW - Vanadium dioxide

KW - defects

KW - oxygen deficiency

KW - stoichiometry

KW - structural phase transition

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Stoichiometry engineering of monoclinic to rutile phase transition in suspended single crystalline vanadium dioxide nanobeams

Abstract

Keywords

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