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Goebl JA, Black RW, Puthussery J, et al. Solution-based II-VI core/shell nanowire heterostructures. J Am Chem Soc. 2008;130(44):14822-33doi: 10.1021/ja805538p.
Goebl, J. A., Black, R. W., Puthussery, J., Giblin, J., Kosel, T. H., & Kuno, M. (2008). Solution-based II-VI core/shell nanowire heterostructures. Journal of the American Chemical Society, 130(44), 14822-33. https://doi.org/10.1021/ja805538p
Goebl, Jim A, et al. "Solution-based II-VI core/shell nanowire heterostructures." Journal of the American Chemical Society vol. 130,44 (2008): 14822-33. doi: https://doi.org/10.1021/ja805538p
Goebl JA, Black RW, Puthussery J, Giblin J, Kosel TH, Kuno M. Solution-based II-VI core/shell nanowire heterostructures. J Am Chem Soc. 2008 Nov 05;130(44):14822-33. doi: 10.1021/ja805538p. Epub 2008 Oct 11. PMID: 18847191.
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J Am Chem Soc. 2008 Nov 05;130(44):14822-33. doi: 10.1021/ja805538p. Epub 2008 Oct 11.

Solution-based II-VI core/shell nanowire heterostructures.

Journal of the American Chemical Society

Jim A Goebl, Robert W Black, James Puthussery, Jay Giblin, Thomas H Kosel, Masaru Kuno

Affiliations

  1. Department of Chemistry and Biochemistry and Notre Dame Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, USA.

PMID: 18847191 DOI: 10.1021/ja805538p

Abstract

We demonstrate the solution-phase synthesis of CdS/CdSe, CdSe/CdS, and CdSe/ZnTe core/shell nanowires (NWs). On the basis of bulk band offsets, type-I and type-II heterostructures are made, contributing to the further development of low-dimensional heteroassemblies using solution-phase chemistry. Core/shell wires are prepared by slowly introducing shell precursors into a solution of premade core NWs dispersed in a noncoordinating solvent at moderate temperatures (215-250 degrees C). Resulting heterostructures are characterized through low- and high-resolution transmission electron microscopy, selected area electron diffraction, and energy dispersive X-ray analysis. From these experiments, initial shell growth appears to occur through either Stranski-Krastanov or Volmer-Weber island growth. However, beyond a critical shell thickness, nucleation of randomly oriented nanocrystals results in a polycrystalline coat. In cases where overcoating has been achieved, corresponding elemental analyses show spatially varying compositions along the NW radial direction in agreement with expected element ratios. Electronic interactions between the core and shell were subsequently probed through optical studies involving UV-vis extinction spectroscopy, photoluminescence experiments, and transient differential absorption spectroscopy. In particular, transient differential absorption studies reveal unexpected shell-induced changes in core NW Auger kinetics at high carrier densities. Previously seen three-carrier Auger kinetics in CdS (bimolecular in CdSe) NWs were suppressed by the presence of a CdSe (CdS) shell. These observations suggest the ability to influence NW optical/electrical properties by coating them with a surrounding shell, a method which could be important for future NW optical studies as well as for NW-based applications.

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