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Direct and continuous synthesis of VO2 nanoparticles

Powell, MJ; Marchand, P; Denis, CJ; Bear, JC; Darr, JA; Parkin, IP; (2015) Direct and continuous synthesis of VO2 nanoparticles. Nanoscale , 7 (44) pp. 18686-18693. 10.1039/c5nr04444h. Green open access

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Monoclinic VO2 nanoparticles are of interest due to the material's thermochromic properties, however, direct synthesis routes to VO2 nanoparticles are often inaccessible due to the high synthesis temperatures or long reaction times required. Herein, we present a two-step synthesis route for the preparation of monoclinic VO2 nanoparticles using Continuous Hydrothermal Flow Synthesis (CHFS) followed by a short post heat treatment step. A range of particle sizes, dependent on synthesis conditions, were produced from 50 to 200 nm by varying reaction temperatures and the residence times in the process. The nanoparticles were characterised by powder X-ray diffraction, Raman and UV/Vis spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The nanoparticles were highly crystalline with rod and sphere-like morphologies present in TEM micrographs, with the size of both the rod and spherical particles being highly dependent on both reaction temperature and residence time. SEM micrographs showed the surface of the powders produced from the CHFS process to be highly uniform. The samples were given a short post synthesis heat treatment to ensure that they were phase pure monoclinic VO2, which led to them exhibiting a large and reversible switch in optical properties (at near-IR wavelengths), which suggests that if such materials can be incorporated into coatings or in composites, they could be used for fenestration in architectural applications.

Type: Article
Title: Direct and continuous synthesis of VO2 nanoparticles
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/c5nr04444h
Publisher version: http://dx.doi.org/10.1039/c5nr04444h
Language: English
Additional information: © Royal Society of Chemistry 2016
Keywords: Science & Technology, Physical Sciences, Technology, Chemistry, Multidisciplinary, Nanoscience & Nanotechnology, Materials Science, Multidisciplinary, Physics, Applied, Chemistry, Science & Technology - Other Topics, Materials Science, Physics, Chemical-Vapor-Deposition, Metal-Insulator-Transition, Hydrothermal Synthesis, Doped Vo2, Supercritical Water, Thin-Films, Phase-Transition, Vanadium-Oxides, Nanorods, Nanostructures
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1479276
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