2014 : Preparation of zinc oxide/silica nanocomposite particles via consecutive sol-gel and flame-assisted spray-drying methods

Prof.Dr.Ir. Sugeng Winardi M.Eng
Dr. Tantular Nurtono ST., M.Eng.
Dr.Eng. Siti Machmudah , ST.,M.Eng.
Dr.Eng Widiyastuti ST., MT.
Fadlilatul Taufany S.T., Ph.D.


Abstract

ZnO/SiO2 nanocomposites were prepared using consecutive sol–gel and flame-assisted spray-drying methods. Zinc oxide and silica sols were prepared individually from zinc acetate and water glass, respectively, via a sol–gel method. Subsequently, zinc oxide sol, silica sol, and a mixture of both were spray dried in a flame reactor to generate powder of pure zinc oxide, pure silica, and a ZnO/SiO2 nanocomposite, respectively, in order to compare the characteristics. The generated particles were characterized via luminescence spectrophotometer, Fourier Transform Infrared (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) to obtain the photoluminescence spectra, chemical bonding, crystallinity, and morphology of the particles, respectively. The photoluminescence emission recorded at 250 nm excitation showed a peak at approximately 400 nm that was characterized by a violet band. The …