Magnetic Properties and Raman Spectroscopy of Cr-Doped Bismuth Telluride Nanotubes

C. F. Garnero, P. Gyawali, A. Lermechin, I. L. Pegg, J. Philip


We have investigated the magnetic properties and Raman spectroscopy of doped bismuth telluride nanotubes. Chromium-doped bismuth telluride nanotubes are synthesized using a wet chemical reaction. The diameter of the nanotubes range from 20–70 nm. Various concentrations of chromium are incorporated in Bi2Te3 nanotubes. The Raman spectra of these nanotubes exhibit infrared active modes that are not active in bulk bismuth telluride. As the Cr concentration increases, the nanotubes exhibit ferromagnetic behavior. The ferromagnetic behavior exists even beyond room temperature. Large saturation magnetization is observed for x = 0.076 (Bi­2-x­CrxTe3), and for higher concentrations the samples become paramagnetic.

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Journal of Materials Science Research   ISSN 1927-0585 (Print)   ISSN 1927-0593 (Online)

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