Preparation of VO<sub>2</sub> Nanoparticles with Surface Functionalization for Thermochromic Application

  • Lalipat Janamphansang King Mongkut’s University of Technology Thonburi
  • Jatuphorn Wootthikanokkhan King Mongkut’s University of Technology Thonburi
  • Saiwan Nawalertpanya King Mongkut’s University of Technology Thonburi
Keywords: surface functionalization, silane, thermochromic composite film, vanadium dioxide

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.

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Author Biographies

Lalipat Janamphansang

Department of Chemical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi (KMUTT), Bangkok 10140, Thailand

Jatuphorn Wootthikanokkhan

Nanotec-KMUTT Center of Excellence on Hybrid Nanomaterials for Alternative Energy, King Mongkut’s University of Technology Thonburi (KMUTT), 126 Pracha Uthit Rd., Bang Mod, Thung Khru, Bangkok 10140, Thailand

Division of Materials Technology, School of Energy, Environment and Materials, King Mongkut’s University of Technology Thonburi (KMUTT), 126 Pracha Uthit Rd, Bang Mod, Thung Khru, Bangkok 10140, Thailand

Saiwan Nawalertpanya

Department of Chemical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi (KMUTT), 126 Pracha Uthit Rd, Bang Mod, Thung Khru, Bangkok 10140, Thailand

Published In
Vol 23 No 5, Sep 30, 2019
How to Cite
[1]
L. Janamphansang, J. Wootthikanokkhan, and S. Nawalertpanya, “Preparation of VO<sub>2</sub&gt; Nanoparticles with Surface Functionalization for Thermochromic Application”, Eng. J., vol. 23, no. 5, pp. 205-215, Sep. 2019.