A novel two-phase thermal approach for synthesizing CdSe/CdS core/shell nanostructure |
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Authors: | A?R?Baby Suganthi Amish?G?Joshi Email author" target="_blank">P?SagayarajEmail author |
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Institution: | (1) Department of Physics, Loyola College (Autonomous), Chennai, 600 034, India;(2) CSIR-National Physical Laboratory (NPL), New Delhi, 110 012, India; |
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Abstract: | CdSe/CdS core/shell nanocrystals have been synthesized through a low cost and simple two-phase thermal route. The optical
spectroscopy and structural characterization evidenced the core/shell structure of the CdSe/CdS nanoparticles. The X-ray diffraction
patterns of CdSe and CdSe/CdS nanoparticles exhibited peak positions corresponding to those of their bulk cubic crystal structures.
The X-ray photoelectron spectroscopy data confirmed the elemental composition of the CdSe/CdS nanoparticles. The absorption
spectra of core/shell nanoparticles showed red shift with respect to the core CdSe nanoparticles. The photoluminescence study
indicates that the intensity of the emission maximum is considerably increased in the core/shell structure as compared with
the parent material, and the capping of CdS nanoparticles with CdSe material exhibit a near band-edge emission, indicating
a successful passivation by removing surface defects. The high-resolution transmission microscope images of the bare and core/shell
nanoparticles ascertained the monodispersed and well-defined spherical particles. The average particle sizes for CdSe and
CdSe/CdS nanoparticles are 2.5 and 5 nm, respectively, thus confirming, the larger diameter of CdSe/CdS core/shell nanostructure
than the core CdSe nanoparticles. |
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