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From the journal:

Journal of Materials Chemistry C

[{VOCl2(CH2(COOEt)2)}4] as a molecular precursor for thermochromic monoclinic VO2 thin films and nanoparticles†

Check for updates Ben Blackburn,a Michael J. Powell,a Caroline E. Knapp,a Joseph C. Bear,*a Claire J. Carmalta and Ivan P. Parkina Author affiliations

* Corresponding authors

a Department of Chemistry, University College London, 20 Gordon Street, London, UK E-mail: joseph.bear.11@ucl.ac.uk

Abstract

The synthesis of thermochromic monoclinic vanadium(IV) oxide (VO2 (M)) thin films and vanadium oxide nanocrystals from a molecular precursor, [{VOCl2(CH2(COOEt)2)}4] is described. Thin films were synthesised using aerosol assisted chemical vapour deposition (AACVD) onto glass substrates at high temperatures and were subsequently characterised and tested for thermochromic efficiency. The film's suitability as smart, energy efficient window coatings was investigated by calculating their solar modulation potential. Thin films were also doped with tungsten to lower their metal to semiconductor transition temperature (MST) through the addition of tungsten(VI) phenoxide during the AACVD process, lowering the MST from a typical ∼70 °C for an undoped VO2 (M) thin film to ∼50 °C for a typical W-doped example. The optimum deposition temperature of 550 °C produced films with thermochromic properties (solar modulation of 15.9%) comparable to the highest values reported. In addition, vanadium oxide nanostructures were synthesised using the thermal decomposition of [{VOCl2(CH2(COOEt)2)}4] and their shape controllably tailored by varying surfactant concentration and type. Thin films and nanostructures were characterised using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDS). Thermochromic measurements were measured using UV-Vis spectroscopy with a variable temperature stage.

Graphical abstract: [{VOCl2(CH2(COOEt)2)}4] as a molecular precursor for thermochromic monoclinic VO2 thin films and nanoparticles This article is Open Access Please wait while we load your content... About Cited by Related Download options Please wait...

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Article information

DOI https://doi.org/10.1039/C6TC03482A Article type Paper Submitted 12 Aug 2016 Accepted 19 Oct 2016 First published 20 Oct 2016 This article is Open Access Creative Commons BY license

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J. Mater. Chem. C, 2016,4, 10453-10463 BibTex EndNote MEDLINE ProCite ReferenceManager RefWorks RIS

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[{VOCl2(CH2(COOEt)2)}4] as a molecular precursor for thermochromic monoclinic VO2 thin films and nanoparticles

B. Blackburn, M. J. Powell, C. E. Knapp, J. C. Bear, C. J. Carmalt and I. P. Parkin, J. Mater. Chem. C, 2016, 4, 10453 DOI: 10.1039/C6TC03482A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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Ben Blackburn Michael J. Powell Caroline E. Knapp Joseph C. Bear Claire J. Carmalt Ivan P. Parkin

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