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Facile synthesis of gradient alloyed ZnxCd1- xS nanocrystals using a microwave-assisted method

Alehdaghi, H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jallcom.2013.09.190
  3. Abstract:
  4. We have synthesized ZnxCd1-xS nanocrystals (NCs) using a microwave assisted method. Zn(Ac)2, CdSO4 and Na2S2O3 were used as the precursors and thioglycerol (TG) was used as the capping agent. Na2S 2O3 is a photo and heat sensitive material, which supplies S species needed for the reaction upon dissociation. In this facile method, microwave irradiation provides the activation energy for the dissociation of Na2S2O3 in and leads to the formation of ZnxCd1-xS NCs in 2 min. The question that to what extent Zn is incorporated into CdS structure was addressed using UV-Vis spectroscopy, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Our results showed that the real value of x in ZnxCd 1-xS NCs is less than the initial values of Zn. Also we have given evidence indicating the formation of a gradient alloyed structure for ZnxCd1-xS NCs. The NCs sizes were calculated by effective mass approximation, using real calculated x values. Photoluminescence spectra indicated a blue-shift by increasing x value, which is consistent with band gap shift
  5. Keywords:
  6. Zn Mole fraction ; Microwave-assisted ; Synthesis ; ZnxCd1−xS nanocrystals (NCs)
  7. Source: Journal of Alloys and Compounds ; Volume 586 , 2014 , Pages 380-384
  8. URL: http://www.sciencedirect.com/science/article/pii/S0925838813023645