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Study of cadmium doped zinc oxide nanocrystals with composition and size dependent band gaps
Yang Yue-tao
Author NameAffiliationE-mail
Yang Yue-tao Institute of Acoustics, Nanjing University yyang@nju.edu.cn 
Abstract:
Monodisperse wurtzite cadmium-doped zinc oxide nanocrystals in the quantum confinement region with molar ratios of cadmium/zinc ranged from 0 to 2.0 have been firstly synthesized by a fast and facile sonochemical method. The alloyed structure of the nanocrystals is confirmed by X-ray diffraction, transmission electron microscopy and infrared analyses. With the increase of the molar ratio of cadmium/zinc, the particle sizes of the samples decreases from 5.1 nm to 2.6 nm. Electronic absorption spectral results show that the band gaps of the samples exhibit red shift then blue shift, and red shift again. The variations of band gaps of cadmium-doped zinc oxide nanocrystals can be interpreted based on their crystal size and the composition. It is found that both the non-thermal equilibrium environment established in the sonochemical reaction and the coordination ability of triethylene glycol solvent play crucial roles in the current preparation.
Key words:  Alloyed nanomaterial  structure  spectroscopy  sonochemistry
FundProject:
Study of cadmium doped zinc oxide nanocrystals with composition and size dependent band gaps
杨跃涛
摘要:
Monodisperse wurtzite cadmium-doped zinc oxide nanocrystals in the quantum confinement region with molar ratios of cadmium/zinc ranged from 0 to 2.0 have been firstly synthesized by a fast and facile sonochemical method. The alloyed structure of the nanocrystals is confirmed by X-ray diffraction, transmission electron microscopy and infrared analyses. With the increase of the molar ratio of cadmium/zinc, the particle sizes of the samples decreases from 5.1 nm to 2.6 nm. Electronic absorption spectral results show that the band gaps of the samples exhibit red shift then blue shift, and red shift again. The variations of band gaps of cadmium-doped zinc oxide nanocrystals can be interpreted based on their crystal size and the composition. It is found that both the non-thermal equilibrium environment established in the sonochemical reaction and the coordination ability of triethylene glycol solvent play crucial roles in the current preparation.
关键词:  Alloyed nanomaterial  structure  spectroscopy  sonochemistry
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