Formation of CoAl 2 O 4 nanoparticles via low-temperature solid-state reaction of fine gibbsite and cobalt precursor
作者： Natpakan Srisawad , Wasu Chaitree , Okorn Mekasuwandumrong , Piyasan Praserthdam , Joongjai Panpranot
DOI: 10.1155/2012/108369
关键词:
摘要: Nanocrystalline cobalt aluminate (CoAl2O4) was synthesized by the solid-state reaction method with chloride hexahydrate (CoCl2 ċ 6H2O) as source of Co and gibbsite (Al(OH)3) Al, respectively. The effects particle size starting fine (0.6 13 µm) calcination temperatures (450, 550, 650°C) on properties CoAl2O4 were investigated means X-ray diffraction (XRD), thermogravimetry analysis differential thermal (TG/DTA), photoelectron spectroscopy (XPS), UV-visible absorption (UV-Vis), scanning electron microscopy (SEM), transmission (TEM). Increasing temperature promoted insertion amounts Co2+ in alumina matrix structure, which resulted brighter blue particles increasing UV spectra band. lowest for formation nanocrystalline 550°C 0.6 µm gibbsite.
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