Thermal conductivity of indium arsenide nanowires with wurtzite and zinc blende phases

Abstract

The thermal conductivity of wurtzite and zinc blende indium arsenide nanowires was measured using a microfabricated device, with the crystal structure of each sample controlled during growth and determined by transmission electron microscopy. Nanowires of both phases showed a reduction of the thermal conductivity by a factor of 2 or more compared to values reported for zinc blende indium arsenide bulk crystals within the measured temperature range. Theoretical models were developed to analyze the measurement results and determine the effect of phase on phonon transport. Branch-specific phonon dispersion data within the discretized first Brillouin zone were calculated from first principles and used in numerical models of volumetric heat capacity and thermal conductivity. The combined results of the experimental and theoretical studies suggest that wurtzite indium arsenide possesses similar volumetric heat capacity, weighted average group velocity, weighted average phonon-phonon scattering mean free path, and anharmonic scattering-limited thermal conductivity as the zinc blende phase. Hence, we attribute the differing thermal conductivity values observed in the indium arsenide nanowires of different phases to differences in the surface scattering mean free paths between the nanowire samples.

Morphology and composition of oxidized InAs nanowires studied by combined Raman spectroscopy and transmission electron microscopy

“…In the simulations, the thermal conductivities were assumed identical in the two directions in order to show the effects of the different NW geometries. For ZB NW, however, numerical studies by Zhou et al [36] show that the thermal conductivity along [110] [37]. Thus a possible explanation of the observed selectivity is an enhanced thermal conductivity along the branch directions leading to a lower temperature.…”

Nanoscale Electromechanics To Measure Thermal Conductivity, Expansion, and Interfacial Losses

“…show near linear temperature dependence of thermal conductivity at cryogenic temperatures. [20][21][22] Equation 1 is solved to obtain the temperature profile along the nanowire for an applied V sd assuming the contacts are in thermal equilibrium with the bath temperature (T (x) = T b for x = 0, L). The temperature profile along the nanowire can be analytically written as:…”

“…20,22 To get a physical understanding we also develop an analytic model that describes our observations. For a tensile stress τ on a resonator of length L, cross sectional area A, and inertia moment I, the natural frequency is given by: 27 f 0 = 1 2π…”

Quantification of probe–sample interactions of a scanning thermal microscope using a nanofabricated calibration sample having programmable size

“…When working in "active mode" (probe is both a heater and a thermometer), SThM can be used to explore the thermal properties of materials, for example nanowires [17] [18], nanotubes [19] and graphene [20][21] [22]. In order to make these measurements quantitative, it is important to understand probe thermal interactions at the nanoscale.…”