Formation of nano-rod sodium tungstate film by sodium ion diffusion

Chang Yeoul Kim; Seung Hun Huh; Doh Hyung Riu

doi:10.1016/j.matchemphys.2009.04.045

Formation of nano-rod sodium tungstate film by sodium ion diffusion

Chang Yeoul Kim, Seung Hun Huh, Doh Hyung Riu

Dept. of Materials Science & Engineering

Korea Institute of Ceramic Engineering And Technology

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

13 Scopus citations

Abstract

Tungsten oxide (WO₃) and nano-rod sodium tungstate (Na₂W₂O₇) thin film was prepared by dip coating on slide glass (SG) and tin-doped indium oxide (ITO) coated glass in peroxotungstic acid (PTA) solution. Thermal analysis results showed that PTA is decomposed to tungsten oxide via multiple steps of WO₃·2/3H₂O, WO₃·1/3H₂O and WO₃. Monoclinic phase appeared on ITO glass at 400 °C and crystal growth occurred at 500 °C. However, quite different crystallization behavior appeared on SG due to sodium ion diffusion. At 400 °C, rectangular shape crystals identified as Na₂W₄O₁₃ appeared in amorphous matrix, and grew to bundles of rod-shaped Na₂W₂O₇ and Na₂W₄O₁₃ phase at 500 °C. Raman scattering spectroscopy data confirmed the formation of Na₂W₄O₁₃ and Na₂W₂O₇ at 500 °C. The understanding of crystallization behavior and sodium ion diffusion into WO₃ thin film on different substrates may be helpful to the application area of electrochromic windows or photocatalyst.

Original language	English
Pages (from-to)	527-531
Number of pages	5
Journal	Materials Chemistry and Physics
Volume	116
Issue number	2-3
DOIs	https://doi.org/10.1016/j.matchemphys.2009.04.045
State	Published - 15 Aug 2009

Keywords

Ion diffusion
Nanorod
Raman
Sodium tungstate
Tungsten oxide

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title = "Formation of nano-rod sodium tungstate film by sodium ion diffusion",

abstract = "Tungsten oxide (WO3) and nano-rod sodium tungstate (Na2W2O7) thin film was prepared by dip coating on slide glass (SG) and tin-doped indium oxide (ITO) coated glass in peroxotungstic acid (PTA) solution. Thermal analysis results showed that PTA is decomposed to tungsten oxide via multiple steps of WO3·2/3H2O, WO3·1/3H2O and WO3. Monoclinic phase appeared on ITO glass at 400 °C and crystal growth occurred at 500 °C. However, quite different crystallization behavior appeared on SG due to sodium ion diffusion. At 400 °C, rectangular shape crystals identified as Na2W4O13 appeared in amorphous matrix, and grew to bundles of rod-shaped Na2W2O7 and Na2W4O13 phase at 500 °C. Raman scattering spectroscopy data confirmed the formation of Na2W4O13 and Na2W2O7 at 500 °C. The understanding of crystallization behavior and sodium ion diffusion into WO3 thin film on different substrates may be helpful to the application area of electrochromic windows or photocatalyst.",

keywords = "Ion diffusion, Nanorod, Raman, Sodium tungstate, Tungsten oxide",

author = "Kim, \{Chang Yeoul\} and Huh, \{Seung Hun\} and Riu, \{Doh Hyung\}",

year = "2009",

month = aug,

day = "15",

doi = "10.1016/j.matchemphys.2009.04.045",

language = "English",

volume = "116",

pages = "527--531",

journal = "Materials Chemistry and Physics",

issn = "0254-0584",

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T1 - Formation of nano-rod sodium tungstate film by sodium ion diffusion

AU - Kim, Chang Yeoul

AU - Huh, Seung Hun

AU - Riu, Doh Hyung

PY - 2009/8/15

Y1 - 2009/8/15

N2 - Tungsten oxide (WO3) and nano-rod sodium tungstate (Na2W2O7) thin film was prepared by dip coating on slide glass (SG) and tin-doped indium oxide (ITO) coated glass in peroxotungstic acid (PTA) solution. Thermal analysis results showed that PTA is decomposed to tungsten oxide via multiple steps of WO3·2/3H2O, WO3·1/3H2O and WO3. Monoclinic phase appeared on ITO glass at 400 °C and crystal growth occurred at 500 °C. However, quite different crystallization behavior appeared on SG due to sodium ion diffusion. At 400 °C, rectangular shape crystals identified as Na2W4O13 appeared in amorphous matrix, and grew to bundles of rod-shaped Na2W2O7 and Na2W4O13 phase at 500 °C. Raman scattering spectroscopy data confirmed the formation of Na2W4O13 and Na2W2O7 at 500 °C. The understanding of crystallization behavior and sodium ion diffusion into WO3 thin film on different substrates may be helpful to the application area of electrochromic windows or photocatalyst.

AB - Tungsten oxide (WO3) and nano-rod sodium tungstate (Na2W2O7) thin film was prepared by dip coating on slide glass (SG) and tin-doped indium oxide (ITO) coated glass in peroxotungstic acid (PTA) solution. Thermal analysis results showed that PTA is decomposed to tungsten oxide via multiple steps of WO3·2/3H2O, WO3·1/3H2O and WO3. Monoclinic phase appeared on ITO glass at 400 °C and crystal growth occurred at 500 °C. However, quite different crystallization behavior appeared on SG due to sodium ion diffusion. At 400 °C, rectangular shape crystals identified as Na2W4O13 appeared in amorphous matrix, and grew to bundles of rod-shaped Na2W2O7 and Na2W4O13 phase at 500 °C. Raman scattering spectroscopy data confirmed the formation of Na2W4O13 and Na2W2O7 at 500 °C. The understanding of crystallization behavior and sodium ion diffusion into WO3 thin film on different substrates may be helpful to the application area of electrochromic windows or photocatalyst.

KW - Ion diffusion

KW - Nanorod

KW - Raman

KW - Sodium tungstate

KW - Tungsten oxide

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U2 - 10.1016/j.matchemphys.2009.04.045

DO - 10.1016/j.matchemphys.2009.04.045

M3 - Article

AN - SCOPUS:67349258516

SN - 0254-0584

VL - 116

SP - 527

EP - 531

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

IS - 2-3

ER -

Formation of nano-rod sodium tungstate film by sodium ion diffusion

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Keywords

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