Thermal conductivity of GaAs nanowires studied by micro-Raman spectroscopy combined with laser heating

摘要

The thermal properties of freely suspended GaAs nanowires are investigated by applying a methodnwhich relies on laser heating and the determination of the local temperature by Raman spectroscopy.nIn order to determine the values for the thermal conductivity u0002, the fraction of the laser powernabsorbed inside the GaAs nanowire is estimated by numerical simulations. The thermal conductivitynof nanowires with homogeneous diameter is found to lie in the range of 8–36 W m−1nK−1n. Thenchange of the temperature profile in the presence of a tapering was investigated. Furthermore, wendiscuss the influence of laser heating in ambient conditions on the value of u0002.© 2010 AmericannInstitute of Physics. u0004doi:10.1063/1.3532848