Authors: S.A. Thorne, Y.V. Bhargava, T.S. Mintz, V. Radmilovic, Y. Suzuki and T.M. Devine
Affilation: University of California, Berkeley, United States
Pages: 630 - 633
Keywords: nanowires, nickel oxide, magnetic, electrochemical
Using a novel electrochemical process, functionalized and self-assembled Ni-rich oxide nanowires were grown from an Alloy 600 (Ni – 15.5 a/o Cr, 8a/o Fe) substrate. The formation of the nanowires occurs in a high-temperature (238-288 degrees C), high-pressure (1500psi) aqueous solution by subjecting Alloy 600 to a specific progression of reducing and oxidizing conditions. The nanowires have an average diameter of 25nm with a range from 3nm to 100nm with a maximum observed length of 20um. Energy dispersive spectra of individual nanowires have indicated a composition of 47a/o Ni, 4a/o Fe, 49a/o O. Their composition, in conjunction with the oxidizing growth environment, suggests that the nanowires are corrosion resistant, an important property for biotechnology applications. SQUID magnetometry shows the nanowires to be ferrimagnetic, with a coercivity of approximately 80Oe and a remnant field of 0.027emu/g. Nanowires have been also synthesized on 70-30 nickel-chrome alloy.