Simple sol-gel process and one-step annealing of vanadium dioxide thin films: Synthesis and thermochromic properties

N. Wang; S. Magdassi; D. Mandler; Y. Long

doi:10.1016/j.tsf.2013.01.074

Simple sol-gel process and one-step annealing of vanadium dioxide thin films: Synthesis and thermochromic properties

N. Wang, S. Magdassi, D. Mandler, Y. Long^*

^*Corresponding author for this work

Institute of Chemistry

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

78 Scopus citations

Abstract

A simple and cost effective sol-gel process for producing vanadium dioxide thin films was developed via thermolysis of V₂O₅· nH₂O (n ≈ 2) V^V precursors prepared by dissolving vanadium powder or V₂O₅ powder in 30% hydrogen peroxide solutions. After spin-coating on fused silica substrates and annealing at 750 C in vacuum, without any intermediate gas reducing step, the major phase VO ₂(M, monoclinic phase) was found in both of the films based on V-H₂O₂ and V₂O₅-H₂O ₂ precursor, exhibiting large transmittance changes (> 40%) in the IR region (> 2000 nm) and small hysteresis loop width (< 5 C) which were comparable to reported epitaxial VO₂ films. The two films have similar metal-to-insulator transition temperature τ_C = 62.5 C, lower than the classical value of 68 C for VO₂ thin films. In addition, the method enables simple doping, as found for 0.56 at.% W-doped VO₂ films. This intrinsically simple solution process followed by one-step annealing makes it potentially useful in smart window applications.

Original language	English
Pages (from-to)	594-598
Number of pages	5
Journal	Thin Solid Films
Volume	534
DOIs	https://doi.org/10.1016/j.tsf.2013.01.074
State	Published - 1 May 2013

Bibliographical note

Funding Information:
This research is supported by the Singapore National Research Foundation under CREATE program: Nanomaterials for Energy and Water Management. The electron microscopy and XRD work were performed at the Facility for Analysis, Characterization, Testing and Simulation (FACTS) in Nanyang Technological University, Singapore.

Keywords

One-step annealing
Smart window
Sol-gel technique
Thermochromic materials
Vanadium dioxide

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10.1016/j.tsf.2013.01.074

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title = "Simple sol-gel process and one-step annealing of vanadium dioxide thin films: Synthesis and thermochromic properties",

abstract = "A simple and cost effective sol-gel process for producing vanadium dioxide thin films was developed via thermolysis of V2O5· nH2O (n ≈ 2) VV precursors prepared by dissolving vanadium powder or V2O5 powder in 30% hydrogen peroxide solutions. After spin-coating on fused silica substrates and annealing at 750 C in vacuum, without any intermediate gas reducing step, the major phase VO 2(M, monoclinic phase) was found in both of the films based on V-H2O2 and V2O5-H2O 2 precursor, exhibiting large transmittance changes (> 40%) in the IR region (> 2000 nm) and small hysteresis loop width (< 5 C) which were comparable to reported epitaxial VO2 films. The two films have similar metal-to-insulator transition temperature τC = 62.5 C, lower than the classical value of 68 C for VO2 thin films. In addition, the method enables simple doping, as found for 0.56 at.% W-doped VO2 films. This intrinsically simple solution process followed by one-step annealing makes it potentially useful in smart window applications.",

keywords = "One-step annealing, Smart window, Sol-gel technique, Thermochromic materials, Vanadium dioxide",

author = "N. Wang and S. Magdassi and D. Mandler and Y. Long",

note = "Funding Information: This research is supported by the Singapore National Research Foundation under CREATE program: Nanomaterials for Energy and Water Management. The electron microscopy and XRD work were performed at the Facility for Analysis, Characterization, Testing and Simulation (FACTS) in Nanyang Technological University, Singapore.",

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AU - Mandler, D.

AU - Long, Y.

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Simple sol-gel process and one-step annealing of vanadium dioxide thin films: Synthesis and thermochromic properties

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Bibliographical note

Keywords

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