Full Paper

The Effect of Stabilizer Density on Transformation of CdTe Nanoparticles Induced by Ag Cations†

  1. Zhiyong Tang1,*,
  2. Paul Podsiadlo2,
  3. Bong Sup Shim2,
  4. Jungwoo Lee2,
  5. Nicholas A. Kotov2,*

Article first published online: 22 SEP 2008

DOI: 10.1002/adfm.200800691

Issue

Advanced Functional Materials

Advanced Functional Materials

Special Issue: International Conference on Nanoscience and Nanotechnology 2008

Volume 18, Issue 23, pages 3801–3808, December 8, 2008

Additional Information

How to Cite

Tang, Z., Podsiadlo, P., Shim, B. S., Lee, J. and Kotov, N. A. (2008), The Effect of Stabilizer Density on Transformation of CdTe Nanoparticles Induced by Ag Cations. Advanced Functional Materials, 18: 3801–3808. doi: 10.1002/adfm.200800691

Author Information

  1. 1

    National Center for Nanoscience and Technology Beijing 100190 (PR China)

  2. 2

    Department of Chemical Engineering, University of Michigan Ann Arbor, Michigan 48109 (USA)

*National Center for Nanoscience and Technology Beijing 100190 (PR China).

  1. †

    The authors thank 100-talent program of Chinese Academy of Sciences (ZYT), MOST No 2005cd724700 (ZYT), NSFC No 20773033 (ZYT), NSF (NAK), AFOSR (NAK), and DARPA (NAK) for the financial support of this research. PP thanks the Fannie and John Hertz Foundation for support of his research through a graduate fellowship. Supporting Information is available online from Wiley InterScience or from the authors.

Publication History

  1. Issue published online: 2 DEC 2008
  2. Article first published online: 22 SEP 2008
  3. Manuscript Revised: 29 JUN 2008
  4. Manuscript Received: 18 MAY 2008

Funded by

  • Chinese Academy of Sciences (ZYT)
  • MOST. Grant Number: 2005cd724700
  • NSFC. Grant Number: 20773033
  • NSF (NAK)
  • AFOSR (NAK)
  • DARPA (NAK)

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Keywords:

  • cadmium telluride;
  • crystal growth;
  • inorganic nanowires;
  • semiconductor nanoparticles;
  • stabilizer density;
  • II–VI semiconductors

Graphical Abstract

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The surface density of stabilizers determines the growth mode and morphology of the transformation products of CdTe nanoparticles induced by Ag cations. CdTe nanoparticles with a low surface density of stabilizers are transformed into Ag2Te nanowire networks, whereas spherical Ag2Te nanoparticles are formed for CdTe nanoparticles with a high surface density of stabilizers.

Abstract

In this study the strong effect of surface density of stabilizers on the outcome of the typical cation replacement reaction in nanoparticles is demonstrated. The density of 2-aminoethanethiol coating determines the growth mode and morphology of the transformation products of CdTe nanoparticles induced by Ag cations. Using quantitative measurements of the stabilizer's surface density, it is demonstrated that CdTe nanoparticles produce Ag2Te nanowire networks upon partial removal of the stabilizer. This process follows the kinetically controlled growth mode but the mechanism changes drastically once stabilizer density is increased. The formation of spherical Ag2Te nanoparticles was observed when CdTe retained the original density of 2-aminoethanethiol. This study provides better understanding of (1) non-classical growth mechanisms of crystals at the nanoscale, (2) effect of stabilizer density on chemical transformations of nanoparticles, and (3) new routes for preparation of nanomaterials.

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