Iron nanoparticles are prepared using the sonochemical method and coated in situ with various organic compounds. The resulting core-shell particles are characterized using TEM, AFM, FTIR, and XRD. Reactivity of the nanoparticles towards oxygen in solution is investigated as a function of temperature using the fluorescence lifetime of pyrene as a measure of oxygen concentration. Our data indicate that at elevated temperatures, the core-shell nanoparticles react with oxygen which is demonstrated by the depletion of oxygen from solution. We probe this reaction by varying the structure and physical properties of the organic coating and discuss the results with respect to the reaction mechanism.
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