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Self-assembled flower-like microstructure in Zn_(1-x)Cd_xO nanoparticles
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作者 R.SANTHI C.SHANTHI +1 位作者 m.sathya K.PUSHPANATHAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第9期2031-2042,共12页
The structural and optical characterization of cadmium-doped zinc oxide nanoparticles synthesized by precipitation method was studied.X-ray diffraction study confirmed the substitution of cadmium dopant without distur... The structural and optical characterization of cadmium-doped zinc oxide nanoparticles synthesized by precipitation method was studied.X-ray diffraction study confirmed the substitution of cadmium dopant without disturbing the basic wurtzite structure of zinc oxide.The average crystalline size,lattice constants and unit cell volume also increased up to4%of cadmium doping.Energy gaps of the samples were determined from the ultraviolet?visible absorption spectrum as well as Tauc’s plot which infers that the energy gap decreases with the increase of cadmium content.Fourier transformation infrared spectrum confirms the cadmium dopant through peak shifting from485to563cm?1.Photoluminescence spectrum also defines the cadmium dopant by intensity increase.The broad Raman peak at437cm?1indicates that the wurtzite structure of zinc oxide is weakened by5%cadmium doping.Field emission scanning electron microscope study also confirms the existence of particles in nanometer size and it indentifies the microstructure transformation from nanoparticles to jasmine flower-like structure on5%cadmium doping. 展开更多
关键词 Cd doping ZnO nanoparticles energy gap crystal structure MICROSTRUCTURE photoluminescence
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Effect of pH on Crystal Size and Photoluminescence Property of ZnO Nanoparticles Prepared by Chemical Precipitation Method 被引量:7
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作者 M.Jay Chithra m.sathya K.Pushpanathan 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2015年第3期394-404,共11页
The effects of pH value on crystal size and optical property of zinc oxide nanoparticles prepared by chemical precipitation method were investigated.Prepared samples have been characterized by means of X-ray diffracti... The effects of pH value on crystal size and optical property of zinc oxide nanoparticles prepared by chemical precipitation method were investigated.Prepared samples have been characterized by means of X-ray diffraction,scanning electron microscopy,ultraviolet-visible spectrometer and photoluminescence spectrometer.From X-ray diffraction profile,it is found that the particle size of sample increases from 13.8 to 33 nm when the pH value of the solution was increased from 6 to 13.Microstructural study also shows that the particle size increases with pH value.Hexagonal shape of the zinc oxide nanoparticle has been confirmed by the scanning electron microscopy image.The recorded ultraviolet-visible spectrum shows excitonic absorption peaks around 381 nm.The energy gap of the prepared samples has been determined from the ultraviolet-visible absorption spectrum,effective mass model equation and Tauc's relation.It was found that the energy gap of the prepared samples decreases with increase in pH value.The recorded blue shift confirmed the quantum confinement effect in the prepared zinc oxide samples.Photoluminescence spectrum infers that the increase in pH value shifts the ultraviolet-visible emission but not the violet and green emissions. 展开更多
关键词 Zinc oxide nanoparticles pH value Crystal structure Microstructure Energy gap Photoluminescence
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