Synthesis and characterization of NiO nanoparticles by sol-gel method
Synthesis and characterization of NiO nanoparticles by sol-gel method
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DOI：
10.1007/s10854-011-0479-6
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发表时间：
2012-03-01
影响因子：
2.8
通讯作者：
Muthamizhchelvan, C.
中科院分区：
文献类型：
--
作者：
Alagiri, M.;Ponnusamy, S.;Muthamizhchelvan, C.
在琼脂糖多糖的存在下，采用溶胶-凝胶法制备了氧化镍纳米颗粒。采用x射线衍射、透射电子显微镜、紫外可见分光光度计和超导量子干涉装置磁强计对产物的结构、形貌、光学和磁性能进行了表征。前驱体产物的热重分析结果表明，适宜的煅烧温度为400℃，x射线衍射结果表明，所得产物为面心立方结构的氧化镍。TEM图像表明，氧化镍纳米颗粒呈球形，尺寸约为3 nm。红外光谱分析证实了产品的组成。NiO纳米粒子的光学吸收带隙估计为3.51 eV。磁测量结果表明，纳米氧化镍在300 K时表现出超顺磁性。此外，由于纳米颗粒表面存在未补偿的力矩，纳米颗粒在4.2 K时表现出铁磁相互作用。
Nickel oxide nanoparticles have been synthesized in the presence of agarose polysaccharide by sol-gel method. The structure, morphology, optical and magnetic properties of the product was examined by X-ray diffraction, transmission electron microscopy, UV-visible spectrophotometer and superconducting quantum interference device magnetometer. The result of thermogravimetric analysis of the precursor product showed that the proper calcination temperature was 400 degrees C. X-ray diffraction result revealed that the obtained product was nickel oxide with face-centered cubic structure. TEM image demonstrated that the nickel oxide nanoparticles have spherical shape with size around 3 nm. Analysis of FTIR spectra confirmed the composition of product. The optical absorption band gap of the NiO nanoparticles was estimated to be 3.51 eV. Magnetic measurement showed that the nickel oxide nanoparticles exhibit superparamagnetic behavior at 300 K. Moreover, the nanoparticles show ferromagnetic interactions at 4.2 K owing to the existence of uncompensated moments on the surface of the nanoparticles.