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Citation: Wang Guo-Zhong, Zhang Li-De, Mou Ji-Mei. Preparation and Optical Absorption of Nanometr-sized NiO Powder[J]. Acta Physico-Chimica Sinica, ;1997, 13(05): 445-448. doi: 10.3866/PKU.WHXB19970511 shu

Preparation and Optical Absorption of Nanometr-sized NiO Powder

1.
Institute of Solid State Physics,Chinese Academy of Sciences,Hefei 230031,P.R.China

Received Date: 15 July 1996
Available Online: 15 May 1997

Uniform nanosized NiO particles were prepared by a chemical coprecipitation using NiCl2?6H2O as the starting material. The relationship between various annealing temperatures and grain size of NiO crystallite was investigated. Optical reflectivity spectra of Nanometer-sized NiO powders at room temperature were studied. The results show that seven optical absorption bands (P1、 P2、P3、P4、P5、P6 and P7) with the peak energies of 3.30, 2.99, 2.78, 2.25,1.92, 1.72 and 1.07eV, respectively, are located on a continuous refiectivity background. P1、 P2、P3 and P4 exhibit "blue shift", but P5、P6 and P7 present "red shift" in comparison with that of single crystal NiO. The continuous reflectivity background increases rapidly with increasing the annealing temperature from 500℃ to 600℃ to 700℃. The origins of P1 to P7 and the reasons of "blue shift", "red shift" and the increase of the reflectivity background with increasing the annealing temperature have been analyzed in detail.
- Nnanometer-sized powder,
- NiO,
- Coprecipitation,
- Optical absorption,
- Red shift,
- Blue shift
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