title: Composition study of CoPt bimetallic nanocrystals of 2 nm.
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.
authors.affiliation: Laboratoire des Matériaux Mésoscopiques et Nanométriques, UMR CNRS 7070, Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris Cedex 05, France. ademortiere@anl.gov
authors.forename: Arnaud
authors.initials: A
authors.lastname: Demortière
authors.forename: Rémi
authors.initials: R
authors.lastname: Losno
authors.forename: Christophe
authors.initials: C
authors.lastname: Petit
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Quisefit
mesh_terms: D000497:Alloys / Q000138:chemical synthesis / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D013052:Spectrometry, X-Ray Emission
chemical_list: D000497:Alloys; C477450:cobalt platinum alloy