Simple and low-temperature preparation of Co3O4 sphere-like nanoparticles via solid-state thermolysis of the [Co(NH3)6](NO3)3 complex
- 作者：Saeid Farhadi ; sfarhad2001@yahoo.com ; Kolsoum Pourzare
- 关键词：A. Nanostructures ; A. Oxides ; C. X-ray diffraction ; D. Magnetic properties ; D. Optical properties
- 刊名：Materials Research Bulletin
- 出版年：2012
- 期刊代码：60_00255408
- 类别：ms
- 出版时间：June, 2012
- 卷：47
- 期：6
- 页码：1550-1556
- 文件大小：1222 K
摘要
In this work, spinel-type Co3O4 spherical nanoparticles were easily prepared via decomposition of the hexamminecobalt(III) nitrate complex, [Co(NH3)6](NO3)3, at low temperature (200 掳C). The product was characterized by thermal analysis (TGA/DTA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, UV-vis spectroscopy, transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), Brunauer-Emmett-Teller (BET) specific surface area measurement and magnetic measurements. The results confirmed that pure single-phase Co3O4 nanoparticles with weak ferromagnetic behavior were obtained by this method. TEM images showed that the Co3O4 nanoparticles are sphere-like with an average diameter size of around 15 nm. The optical spectrum indicated two direct band gaps at 2.15 and 3.56 eV which are blue-shifted relative to reported values for the bulk sample. Using this fast and simple method, Co3O4 nanoparticles can be produced without expensive and toxic solvents or complicated equipment.