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[1] Doerk , Carraro , Maboudian , Phys. Rev. B 80 , 073306 (2009)

Single Nanowire Thermal Conductivity Measurements by Raman Thermography Roya Maboudian , University of California-Berkeley , DMR 0804646.

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[1] Doerk , Carraro , Maboudian , Phys. Rev. B 80 , 073306 (2009)

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  1. Single Nanowire Thermal Conductivity Measurements by Raman ThermographyRoyaMaboudian, University of California-Berkeley, DMR 0804646 In contrast to bulk or thin film characterization technqiues which may be tedious, imprecise or destructive when applied to semiconductor nanowires, transport imaging presents an attractive alternative that is rapid, simple, and well suited to anisotropic nanowire geometries. Using the temperature dependence of the optical phonon frequency in silicon (which we had previously measured in individual Si nanowires [1]), we have employed simultaneous laser heating and Raman spectroscopic-based thermal mapping to measure the thermal conductivity of individual epitaxially VLS-grown Si nanowires. The results agree well with values predicted by diffuse phonon boundary scattering [2]. This technique demonstrates how transport imaging may complement or supplant other standard thermal transport measurement techniques. A B A: Map of the optical phonon integrated peak intensity for a single epitaxial cantilevered Si nanowire (scale bar = 500 nm). B: Thermal conductivity measurements for individual Si nanowires in air and at low pressure. The predicted curve assuming diffuse phonon boundary scattering is included for comparison. [1]Doerk, Carraro, Maboudian, Phys. Rev. B 80, 073306 (2009) [2] Doerk, Carraro, Maboudian, ACS Nano4, 4908-4914 (2010)

  2. Active Involvement of Undergraduate Students in Research RoyaMaboudian, University of California-Berkeley, DMR 0804646 Undergraduate mentoring has continued to be an integral part of this project. Undergraduate student, Mun Sek Kim, is participating in summer research in our group. The research involves the growth and characterization of silicon carbide nanowires. As part of our outreach efforts, presentation entitled “How to write a scientific paper (and get it published)” was given during the REU summer program by postdoctoral researcher, Albert Gutés. In addition, lab tour was given to prospective K-12 science teachers. In the same REU program, mentoring of the junior student JiaWen Huang took place in our lab. Her research involves developing a new hydrogen peroxide sensing platform that might be useful in the subsequent development of a glucose biosensor. Postdoctoral researcher Albert Gutés on a lab-tour during an informative session to prospective K-12 science teachers (top).Undergraduate student JiaWen Huang standing next to her research poster during the Research Experience for Undergraduates (REU) program poster session (bottom).

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