Graf, D;
Schläfer, J;
Garbe, S;
Klein, A;
Mathur, S;
(2017)
Interdependence of Structure, Morphology, and Phase Transitions in CVD Grown VO 2 and V 2 O 3 Nanostructures.
Chemistry of Materials
, 29
(14)
pp. 5877-5885.
10.1021/acs.chemmater.7b01018.
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Abstract
Phase selective chemical vapor deposition of nanostructured vanadium dioxide (VO2) and sesquioxide (V2O3) was achieved by deploying [V(OR)4]n (R = tBu, n = 1 (1), R = Et, n = 3 (2), R = Me, n = 4 (3)). Use of [V(OtBu)4] (1) produced thin films of monoclinic VO2 (M1) at 700 and 800 °C consisting of anisotropic nanostructures with high crystallinity and small hysteresis in the metal-to-semiconductor transition (MST). Film morphologies manifested strong dependence on growth temperatures and exhibited pronounced texturing effects at high temperatures (>700 °C). The microstructure of the films was found to significantly affect the MST behavior of VO2 films. DTA measurements of VO2 films showed MST at 63 °C (700 °C) and 65 °C (800 °C), much lower than the transition temperature observed in single crystal material (68 °C). Precursors were characterized in the solid state (XRD) and solution state (temperature dependent EPR, NMR) to reveal an association–dissociation equilibrium in solution (complexes 2 and 3), involving monomeric, dimeric, and oligomeric species. Use of 2 and 3 as single precursors produced thin films of crystalline V2O3 consisting of nanosheets (5 nm) with a flower-like morphology.
| Type: | Article |
|---|---|
| Title: | Interdependence of Structure, Morphology, and Phase Transitions in CVD Grown VO 2 and V 2 O 3 Nanostructures |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acs.chemmater.7b01018 |
| Publisher version: | http://dx.doi.org/10.1021/acs.chemmater.7b01018 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1566368 |
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