eprintid: 1566368
rev_number: 26
eprint_status: archive
userid: 608
dir: disk0/01/56/63/68
datestamp: 2017-07-23 03:20:21
lastmod: 2020-06-19 04:03:26
status_changed: 2017-08-09 14:51:31
type: article
metadata_visibility: show
creators_name: Graf, D
creators_name: Schläfer, J
creators_name: Garbe, S
creators_name: Klein, A
creators_name: Mathur, S
title: Interdependence of Structure, Morphology, and Phase Transitions in CVD Grown VO 2 and V 2 O 3 Nanostructures
ispublished: pub
divisions: UCL
divisions: A01
divisions: B04
divisions: C05
note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
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.
date: 2017-07-13
date_type: published
official_url: http://dx.doi.org/10.1021/acs.chemmater.7b01018
oa_status: green
full_text_type: other
language: eng
primo: open
primo_central: open_green
article_type_text: Article
verified: verified_manual
elements_id: 1405240
doi: 10.1021/acs.chemmater.7b01018
lyricists_name: Schlaefer, Johannes
lyricists_id: JSCHL78
actors_name: Dewerpe, Marie
actors_id: MDDEW97
actors_role: owner
full_text_status: public
publication: Chemistry of Materials
volume: 29
number: 14
pagerange: 5877-5885
issn: 1520-5002
citation:        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 <https://doi.org/10.1021/acs.chemmater.7b01018>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1566368/1/Graf_Manuscript_resubmission_Graf.pdf