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Structural, optical and ferromagnetic properties of cobalt doped CdTe quantum dots

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Abstract

Cobalt doped cadmium telluride (CdTe) quantum dots (QDs) were synthesized with different Co concentrations by using non-aqueous method. CoxCd1−xTe QDs were characterized using optical absorption and photoluminescence spectroscopy, X-ray diffraction and high resolution transmission electron microscopy (HRTEM). It was noted that Co2+ was incorporated CdTe QDs without any shift in the diffraction peaks. HRTEM images revealed that the CdTe QDs were regular spherical particles with an average diameter of ~3 nm for undoped CdTe QDs and the average size of 2, 5 and 15 % Co2+ doped CdTe QDs were 4, 6.5 and 2.8 nm, respectively. Magnetization recognized for 0, 2, 5 and 15 % cobalt doped CdTe QDs revealed a ferromagnetic signal and ferromagnetic hysteresis loop. For pristine CdTe QDs a weak ferromagnetism was attributed to the charge transfer between capping agent and host CdTe QDs. Co2+ doped CdTe QDs exhibit stronger ferromagnetism and magnetic parameters such as saturation magnetization, MS, remanence, MR, and coercivity, HC, of CoxCd1−xTe QDs were obtained from the hysteresis loops. It was found that with increasing the doping concentration of Co2+ in CdTe QDs up to 5 %, Ms increased.

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Authors and Affiliations

  1. Department of Materials Science, Institute of Graduate Studies and Research, Alexandria University, 163 Horrya Avenue, El-Shatby, P.O. Box 832, Alexandria, Egypt

    Sh. Ebrahim & M. Ali

  2. Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt

    W. Ramadan

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  1. Sh. Ebrahim
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  2. W. Ramadan
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  3. M. Ali
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Correspondence to Sh. Ebrahim.

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Ebrahim, S., Ramadan, W. & Ali, M. Structural, optical and ferromagnetic properties of cobalt doped CdTe quantum dots. J Mater Sci: Mater Electron 27, 3826–3833 (2016). https://doi.org/10.1007/s10854-015-4229-z

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  • DOI: https://doi.org/10.1007/s10854-015-4229-z

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