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Thermoelectric Transport Properties of Individual Bismuth Nanowires

  • Stephen B. Cronin (a1), Yu-Ming Lin (a2), Oded Rabin (a3), Marcie R. Black (a2), Gene Dresselhaus (a4) and Mildred S. Dresselhaus (a1) (a2)...

Abstract

We developed a method for making 4-point contacts to Bi nanowires with a thick oxide coat using a combination of lithographic and focused ion beam (FIB) techniques. The resistivity of Bi nanowires with diameters in the range 70-200nm is found to increase with decreasing wire diameter. In contrast to bulk Bi, the temperature dependence of the resistivity is found to decrease monotonically with increasing temperature. The results are explained on the basis of increased scattering in the nanowire and the known temperature dependence of the electronic properties of bulk Bi. A large magneto-resistance was also measured, indicating a high crystalline quality of the nanowires. A large spread in the measured values of the resistivity indicates significant systematic error in the measurement technique. Possible sources for error are discussed.

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2. Lin, Y.-M., Sun, X. and Dresselhaus, M.S., Phys. Rev. B. 62, 4610 (2000).
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5. Cronin, S. B., Lin, Y.-M., Rabin, O., Black, M. R., Dresselhaus, G. and Dresselhaus, M. S., “4-point resistance measurements of individual Bi nanowires”, in Anisotropic Nanoparticles: Synthesis, Characterization and Applications: MRS Symposium Proceedings, Boston, December 2000.
6. Cronin, S. B., Lin, Y.-M., Rabin, O., Black, M. R., Dresselhaus, G. and Dresselhaus, M. S., “Electronic Properties of Bi nanowires”, in Nonlithographic and Lithographic Methods for Nanofabrication: MRS Symposium Proceedings, San Fransisco, April, 2001.
7. Cronin, S., Lin, Y.-M., Koga, T., Sun, X., Ying, J. Y., and Dresselhaus, M. S., “Thermoelectric Investigation of Bismuth Nanowires”, in The 18th International Conference on Thermoelectrics: Symposium Proceedings, Baltimore, MD, 1999.

Thermoelectric Transport Properties of Individual Bismuth Nanowires

  • Stephen B. Cronin (a1), Yu-Ming Lin (a2), Oded Rabin (a3), Marcie R. Black (a2), Gene Dresselhaus (a4) and Mildred S. Dresselhaus (a1) (a2)...

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