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Metal silicide nanowires such as copper silicide have been shown to self-assemble into nanowire and nanoisland structures on the surface of silicon substrates. The self-assembly of these nanostructures occurs during reactive deposition epitaxy (RDE). It was observed that varying the surface step orientation of a sample with respect to an applied electric field had a direct influence on the length...
Self assembled Cu3Si nanoislands and nanowires on Si(110) were fabricated with electron beam evaporation in ultra high vacuum while annealing the substrate at 600 ° C. Scanning tunneling microscopy technique was used to study the resultant nanostructures of sub 10 nm size. Surface images of a nanoisland and nanowire were obtained. The former showed evidence of single crystalline structures. The length,...
Self assembled Copper-Silicide nanowires were fabricated on a 600 °C annealed Si(111) substrate by electron beam evaporation technique. In situ scanning electron microscopy images of self assembled Copper-Silicide nanowires and nanoislands were obtained. In situ four point probe electrical resistivity measurements were performed on Copper-Silicide nanowires using Pt-Ir probes. The cross section geometry...
The Young-Laplace equation was incorporated into Timoshenko beam theory to model the free vibration of bending nanowires while taking into account the surface properties. Three boundary conditions were considered: cantilever, simply-supported and fixed-fixed ends. A method based on Fourier series expansion is introduced to solve for the free vibration solution with specific initial conditions. The...
This paper presents a method of fabricating self assembled bimetallic Ag and Cu-Si nanowires on Si(001) with electron beam (e-beam) evaporation in ultra high vacuum (UHV) environment. We fabricated three types of bimetallic nanowires with two variations of Ag/Cu-Si that were modulated in longitudinal segment wise and a parallel type of bimetallic nanowire. Two types of fabrication were performed:...
This paper presents material properties of self-assembled Cu nanowires that were fabricated in the vacuum e-beam evaporation method. Diffraction patterns obtained from the Transmission Electron Microscopy (TEM) indicate that the Cu nanowires have two slightly different properties: single crystalline structures and polycrystalline structures with low angle grain boundary. Focused ion beam (FIB) was...
This paper describes an experimental procedure for growing self assembled Cu nanowires on a 4° miscut Si(001) substrate with and without the native oxide layer by the e-beam evaporation method. The physical characteristics of the Cu nanowires were observed using an in situ and ex situ scanning electron microscope (SEM). The results are compared with Ag nanowires that were fabricated with the same...
Surface stress was incorporated into the finite element absolute nodal coordinate formulation in order to model elastic bending of nanowires in large deformation. The absolute nodal coordinate formulation is a numerical method to model bending structures in large deformation. The generalized Young-Laplace equation was employed to model the surface stress effect on bending nanowires. Effects from surface...
The development of devices made of micro- and nano-structured thin film materials has resulted in the need for advanced measurement techniques to characterize their mechanical properties. Photoacoustic techniques, which use pulsed laser irradiation to nondestructively induce very high frequency ultrasound in a test object via rapid thermal expansion, are suitable for nondestructive and non-contact...
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