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Composition study of CoPt bimetallic nanocrystals of 2 nm

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Abstract

The synthesis of bimetallic alloy nanocrystals with a well-controlled relative composition is a real challenge and requires chemical analysis techniques with high accuracy. A new chemical route has been used to synthesize cobalt–platinum nanocrystals of 2-nm diameter in a wide range of relative stoichiometry. A study of the elemental composition of the nanoalloy was carried out by X-ray fluorescence (XRF) spectroscopy and energy-dispersive X-ray analysis. We have developed a set-up for XRF analysis using a silicon wafer as a support to determine the elemental composition with only a small amount of sample. The calibration step and the measurement capabilities are described. In a composition range of 25–75% cobalt, the results of both analytical methods are discussed and compared in detail.

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Acknowledgement

The authors would like to express their gratitude to Dr. Anh-tu Ngo, LM2N (UMR 7070), Paris, France, for his work on the EDX analysis of nanocrystal samples.

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Authors and Affiliations

  1. Laboratoire des Matériaux Mésoscopiques et Nanométriques, UMR CNRS 7070, Université Pierre et Marie Curie, 4 place Jussieu, 75252, Paris Cedex 05, France

    Arnaud Demortière & Christophe Petit

  2. Laboratoire Inter-Universitaire des Systèmes Atmosphériques, UMR CNRS 7583, Université Paris 7 et 12, 94910, Créteil, France

    Rémi Losno & Jean-Paul Quisefit

Authors
  1. Arnaud Demortière
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  2. Rémi Losno
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  3. Christophe Petit
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  4. Jean-Paul Quisefit
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Correspondence to Arnaud Demortière.

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Demortière, A., Losno, R., Petit, C. et al. Composition study of CoPt bimetallic nanocrystals of 2 nm. Anal Bioanal Chem 397, 1485–1491 (2010). https://doi.org/10.1007/s00216-010-3689-5

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  • DOI: https://doi.org/10.1007/s00216-010-3689-5

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