N.M. Bahadur, Y. Akter, K. Afrin, S. Islam, S. Alam, R. Rashid, M.A. Samad Azad, N. Suzuki, M. Sato
Noakhali Science and Technology University,
Keywords: core-shell, nanocomposite, transmission electron microscopy, photocatalysis, biomolecular engineering, X-ray contrast agent
Summary:A novel and rapid microwave (MW) irradiation method was used to prepare different kinds of metal-silica (Au@SiO2, Ag@SiO2, Cu@SiO2), metal oxide-metal oxide (TiO2@SiO2, TiO2@ZnO, CeO2@TiO2, Al2O3-SiO2, etc) and AgI@SiO2 nanocomposite materials. The resulted core-shell nanocomposites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Field emission scanning electron microscopy (FE-SEM), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray Fluorescence spectroscopy (XRF), UV-vis spectroscopy, etc. Compared to the conventional sol-gel method, which needs from 24 hrs to days to prepare the materials, the new MW method required 2-5 min to prepare the core-shell nanocomposite materials. In the case of metal-silica nanocomposite synthesis, the coating layer thickness could be varied from few nanometer (nm) to 100 nm within 2-5 min only by changing the respective precursors concentration only. Very thin and uniform coating layer could also be formed in the case of metal oxide-metal oxide cases using MW method. The materials prepared by this new method showed superior properties compared to the materials prepared by conventional method. The possible application of the prepared materials was carried out for immediate use in different fields such as environmental remediation, biomolecular engineering, cosmetic industry, X-ray contrast agent, etc.