Preparation of VO2 nanoparticles with surface functionalization for thermochromic application
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Author list: Janamphansang L., Wootthikanokkhan J., Nawalertpanya S.
Publisher: Faculty of Engineering
Publication year: 2019
Journal: Engineering Journal (0125-8281)
Volume number: 23
Issue number: 5
Start page: 205
End page: 215
Number of pages: 11
ISSN: 0125-8281
eISSN: 0125-8281
Languages: English-Great Britain (EN-GB)
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Abstract
This recent work investigates on the modification of metal oxide particles surface by the addition of amorphous coating layer. This core-shell structure is expected to decrease particles aggregation and increase their distribution in polymer matrix. VO2 particles were firstly prepared via hydrothermal process with 87% yield and XRD analysis showed that VO2 monoclinic was obtained with 100% of purity. XPS technique also showed that the surface of VO2 particles contains-OH group which is promising to form the strong covalent bond with silane coupling agent. The addition of functional groups on the surface of VO2 particles was then performed by the grafting of (3-Aminopropyl) triethoxysilane (APTES) via the silane anchoring group with 1:10 weight ratio VO2/APTES. The effect of solvent was also studied by using 10 ml of different solvent such as distilled water, ethanol and chloroform during surface coating. The TEM image clearly shows the presence of the thick organic layer on VO2 particles and as a result, the core-shell structure was perfectly identified. The round shape of coated VO2 particles was detected with small aggregation by SEM imageries. Furthermore, the presence of characteristic absorption band of C-H, Si-O-C, Si-O-Si and NH stretching in the FTIR spectra of coated VO2 particles confirmed the existence of APTES on the surface of VO2 particles prepared in distilled water and ethanol. ฉ 2019, Chulalongkorn University, Faculty of Fine and Applied Arts. All rights reserved.
Keywords
Silane, Surface functionalization, Thermochromic composite film, Vanadium dioxide
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