Suteewong, Teeraporn

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Suteewong, Teeraporn
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teeraporn.su@kmitl.ac.th

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    Item type:Publication,
    Effect of Morphology of Titanium Dioxide Nanoparticles on Photocatalytic Activity
    (2019-10-25)
    Thiwakornkitkul, Naphat
    ;
    Suteewong, Teeraporn
    Dispersing nanoparticles into the matrix is a simple but effective method to improve properties of coating layer. Titanium dioxide (TiO<inf>2</inf>), known for its photocatalytic activity (PCA) to degrade organic substances and to protect microbial infection, is considered to be potential candidate. However, intense light is required to achieve high PCA. Scattering layer composing of hollow TiO<inf>2</inf> nanoparticles, known as light harvester in solar cell devices, may be suitable for photocatalysis at lower light intensity. In this work, we studied the effect of hollow morphology to the PCA of TiO<inf>2</inf> nanoparticles. Hollow TiO<inf>2</inf> nanoparticles were successfully synthesized using hard-template-assisted sol-gel method. Transmission Electron Microscope (TEM) images show hollow TiO<inf>2</inf> nanoparticles possessing 125-nm hollow core and 50-nm TiO<inf>2</inf> shell. X-ray Diffraction (XRD) results revealed no crystalline peak for both calcined and non-calcined samples, but difference for each sample was reported by Ultraviolet-Visible Diffuse Reflectance Spectroscopy (UV-DRS). UV-DRS spectrum showed the higher diffuse reflectance for both hollow TiO<inf>2</inf> samples than the dense counterpart, suggesting multiple light scattering and high reflection. However, energy bandgaps of amorphous and calcined hollow TiO<inf>2</inf> samples are higher than dense counterparts.
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    Green synthesis of AgNPs coated mesoporous silica nanoparticles using tyrosine as reducing/stabilising agent
    (2018-01-01)
    Ratirotjanakul, Waranya
    ;
    Sioloetwong, Tanapon
    ;
    Suteewong, Teeraporn
    ;
    Tangboriboonrat, Pramuan
    A novel, simple and environmental friendly approach to fabricate silver nanoparticles (AgNPs) on mesoporous silica nanoparticles (MSNs) using tyrosine (Tyr) as biological reducing agent was developed. The functionalization of Tyr with MSNs (Tyr-MSNs) (150 nm in length) by the sol-gel process was confirmed by the characteristic peaks of amino, carboxyl and silanol groups appeared in FTIR spectrum and the change of the zeta potential from 0 mV at pH 2 to -60 mV at pH 12. Then, AgNPs were formed on the surface of Tyr-MSNs (Tyr-MSN@AgNPs) via only reducibility from phenolic group of Tyr and catalytic activity from base at room temperature. TEM images and UV-Visible absorption band at 420 nm supported the obtained AgNPs (18 nm at pH 11) were tightly bound to Tyr-MSNs even after centrifugation at high speed. These Tyr-MSN@AgNPs would be potentially used as drug carrier in biomedical applications.