Abstract
Arrays of nickel and gold nanorods have been grown on glass and silicon substrates usingporous alumina templates of less than 500 nm thickness. A method is demonstrated forvarying the diameter of the nanorods whilst keeping the spacing constant. Opticalextinction spectra for the gold nanorods show two distinct maxima associated with thetransverse and longitudinal axes of the rods. Adding small quantities of oxygen to thealuminium before anodization is found to improve the sharpness of the extinction peaks.The spectral position of the longitudinal peak is shown to be sensitive to the nanoroddiameter for constant length and spacing. For the nickel nanorods it is shown that themagnetic properties are governed by both interactions between the wires and shapeanisotropy.
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