Conductivity Size Effect of Square Cross-Section Polycrystalline Nanowires

Size Effects on the Thermal Conductivity of Polycrystalline Platinum Nanofilms

Polycrystalline Platinum Nanofilms Q. G. ZHANG, B. Y. CAO, X. ZHANG, M. FUJII and K. TAKAHASHI, J. Phys.: Condens. Matter, 2006, 18, (34), 7937–7950 The thicknesses of the studied polycrystalline Pt nanofilms (1) ranged from 15.0–63.0 nm and the mean grain sizes varied from 9.5–26.4 nm. The thermal conductivities of (1) measured by a direct electrical heating method are greatly reduced from the...

Suppression of phonon heat conduction in cross-section-modulated nanowires

We have theoretically demonstrated that phonon heat flux can be significantly suppressed in Si and Si/SiO2 nanowires with the periodically modulated cross-section area—referred to as the cross-section-modulated nanowires—in comparison with the generic uniform cross-section nanowires. The phonon energy spectra were obtained using the five-parameter Born–von Karman-type model and the face-centere...

Scattering cross section of metal catalyst atoms in silicon nanowires

Sharp corners in the cross section of ultrathin Si nanowires.

We have determined stable geometries for pristine Si nanowires grown along their 100 axis through systematic density functional studies. Strikingly, Si nanowires with diameters smaller than 1.7 nm prefer a shape that has a square cross section. This stems from dimerization between corner atoms and also from benign reconstruction patterns that maximally saturate Si dangling bonds.

Plasmon resonances of silver nanowires with a nonregular cross section

We investigate numerically the spectrum of plasmon resonances for metallic nanowires with a nonregular cross section, in the 20–50 nm range. We first consider the resonance spectra corresponding to nanowires whose cross sections form different simplexes. The number of resonances strongly increases when the section symmetry decreases: A cylindrical wire exhibits one resonance, whereas we observe...