Composition study of CoPt bimetallic nanocrystals of 2 nm

Demortière, Arnaud; Losno, Rémi; Petit, Christophe; Quisefit, Jean-Paul
June 2010
Analytical & Bioanalytical Chemistry;Jun2010, Vol. 397 Issue 4, p1485
Academic Journal
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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