24–26 May 2017
Rayong Marriott Resort & Spa
Asia/Bangkok timezone

Hydrothermal synthesis and characterization of hyperbranched BiVO$_4$ microstructure and its applications

25 May 2017, 14:45
15m
Ballroom 2

Ballroom 2

Oral Material Physics and Functional Materials A13: Material Physics

Speaker

Dr Nuengruethai Ekthammathat (Program of Chemistry, Faculty of Science and Technology, Bansomdejchaopraya Rajabhat University)

Description

Bismuth vanadate (BiVO$_4$) microstructures were successfully synthesized by a hydrothermal method at 200 °c for 24 h. The phases and morphologies of the products were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and photoluminescence (PL) spectroscopy. BiVO$_4$ microstructures were self-assembled from bismuth nitrate and ammonium vanadate solutions by controlling pH of the precursor solutions without adding surfactant. The XRD results show that the products were pure monoclinic BiVO$_4$ phase at the pH 1. At pH 1 and 2, the morphologies of the products were hyperbranched and spherical microstructure, respectively. The PL spectra were determined by an excitation wavelength of 275 nm. They showed the similar peaks at 420 nm (2.95 eV) and 365 nm (3.40 eV) for those of the products synthesized at the pH 1-2. In addition, the anti-bacterial properties of the as-synthesized BiVO$_4$ were investigated. The result shows that BiVO$_4$ synthesized at the pH 1 can play the role in inhibiting of S. aureus (3.5×10-5 CFU) more than E. Coli (a large number of counts).

Primary author

Dr Nuengruethai Ekthammathat (Program of Chemistry, Faculty of Science and Technology, Bansomdejchaopraya Rajabhat University)

Co-authors

Mr Pornchai Pornharuthai (Program of Tool and Die Engineering, Faculty of science and Technology, Bansomdejchaophraya Rajabhat University) Dr Anukorn Phuruangrat (Department of Materials Science and Technology, Faculty of Science, Prince of Songkla University) Prof. Titipun Thongtem (Department of Chemistry, Faculty of Science, Chiang Mai ) Prof. Somchai Thongtem (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University)

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