FeCo nanoparticles

Corrias A, Casula MF, Falqui A, Paschina G (2004) Evolution of the structure and magnetic properties of FeCo nanoparticles in an alumina aerogel matrix. Chem Mater 16 3130-3138... 

CNTs-nanoparticles composites have also been exploited for electrochemical sensing applications [17, 118, 119[. Incorporation of metal and oxide nanoparticles has been demonstrated to enhance the electrocatalytical efficiency. A wide range of particles have been used (Pt, Pd, Co, FeCo alloy, Co, Cu, Ag, Cu) and in some cases such CNT/nanoparticles have been combined together with charged polymers [17]. 

TEM shows that the nanoparticles with diameter 10 nm were homogeneously distributed within the matrix XRD data indicated that best results were obtained in the microporous aerogel where after reduction/cc-Co and hcc-Fe were formed respectively in the composites containing only one metal. In the FeCo-Si02 nanocomposites a bcc phase expected for the FeCo alloy was detected by XRD, and the main peak shifted according to the expected variation of the cell parameter for the FeCo alloy. 

Figure 16.14. Possible scenarios for the microstructure of a 4 run diameter FeCo alloy nanoparticle (A) nanoparticle consists of a single homogenous alloy phase (B) nanoparticle is covered with a 0.2 nm layer of iron oxide determining a slightly reduced concentration of Fe in the core of the alloy (reproduced from [74] by permission of Cambridge University Press).

Carta D, Mountjoy G, Gass M, Navarra G, Casula MF, Corrias A (2007) Structural characterization study of FeCo alloy nanoparticles in a highly porous aerogel silica matrix. J Chem Phys 127 204705... 

Corrias A, Navarra G, Casula MF, Marras S, Mountjoy, G (2005) An X-ray absorption spectroscopy investigation of the formation of FeCo alloy nanoparticles in AI2O3 xerogel and aerogel matrixes. J Phys Chem B 109 13964-13970... 

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