A Bioinspired Approach to the Synthesis of Bimetallic CoNi Nanoparticles

作者：Galvez Natividad^*; Valero Elsa; Ceolin Marcelo; Trasobares Susana; Lopez Haro Miguel; Calvino Jose J; Dominguez Vera Jose M

来源：Inorganic Chemistry, 2010, 49(4): 1705-1711.

DOI：10.1021/ic902128g

Bimetallic CoNi nanoparticles have been prepared within the apoferritin cavity. The protein shell controls size, prevents aggregation, and makes nanoparticles water-soluble. The CoNi series prepared in this way were structurally and magnetically characterized, the resulting magnetic properties varying accordingly with composition (Co(75)/Ni(25), Co(50)/Ni(50), Co(25)/Ni(75)). Co and Ni metals were associated in each nanoparticle, as demonstrated by high-angle annular dark field scanning electron microscopy and electron energy loss spectroscopy (EELS). After intentional oxidation, the CoNi nanoparticles were characterized by EELS, X-ray absorption near edge structure (XANES), and SQUID measurements to evaluate the importance of the oxidation on magnetic properties.

• 出版日期2010-2-15