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Title of Journal: J Nanopart Res

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Abbravation: Journal of Nanoparticle Research

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Springer Netherlands

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DOI

10.1007/s10657-005-1737-y

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1572-896X

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Optical properties and ferromagnetism of ternary C

Authors: GuoLong Tan Min Wang Kai Wang Lin Zhang XueFeng Yu
Publish Date: 2010/12/31
Volume: 13, Issue: 11, Pages: 5799-5807
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Abstract

Cd1−x Mn x Te x = 0 01 02 nanocrystals have been synthesized by mechanical alloying MA Cd Mn and Se elemental powders XRD patterns and HRTEM images confirmed the formation of cubic Cd1−x Mn x Te nanocrystals All the diffraction peaks from elemental Cd Mn and Te powders disappeared completely in those XRD patterns of asmilled Cd1−x Mn x Te nanocrystals for more than 20 h When the MA process was carried out for 40 h typical zinc blende structure diffraction mode was exhibited in the XRD pattern Subsequently capping the surface of asmilled Cd1−x Mn x Te nanocrystals with long chain trioctylphosphine/trioctylphosphine oxide/nitric acid TOP/TOPO/NA molecules has achieved colorful dispersion solution which shows similar optical properties to those CdTe nanocrystals prepared by wet chemical process The grain size is within the range of 2–8 nm for the capped Cd1−x Mn x Te nanocrystals being ball milled for 40 h The PL excitation peak red shifts to longer wavelength side with increasing Mn concentration Pure CdTe nanocrystals show ferromagnetism behavior at room temperature the saturation magnetization value and magnetic hysteresis loop increase with the content of substituting Mn ions within the Cd1−x Mn x Te nanocrystals

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