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Three samples of GaAs NWs grown with different n-type dopants flux rates were researched. From SEM figures, we can find that all NWs are vertical to the substrate and no lateral growth occurs. The growth rate is proportional the flux rates of n-type dopant SiH4. Larger SiH4 flux rate results in larger growth rate of NWs. For n-doped NWs, their growth were affected by Gibbs-Thomson effect, which is...
SiC thin films (undoped and doped with SnO2 at 1 at.%, 5 at.% and 10 at.% concentrations) are prepared using pulsed laser deposition on quartz substrates kept at room temperature. The XRD patterns show a crystalline cubic phase for the undoped and 10 at.% SnO2 doped SiC thin films while 1 at.% and 5 at.% SnO2 doped SiC thin films exhibit an amorphous nature. The formation of nanorods with a non-uniform...
RuO2 nanocrystals (NCs) were deposited on carbon nanotubes (CNTs) by reactive RF magnetron sputtering using a Ru target under different conditions. Their surface morphology, structural, spectroscopic and field emission (FE) properties were studied using field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM), Raman spectroscopy, and a home made high vacuum FE...
Based on diffusion-limited aggregation process, a convenient nanotechnique is demonstrated to obtain fractal silver on conductive substrate. SEM and HRTEM images show the morphology nanostructure can be well controlled by the electrochemical process. The as-fabricated silver nanostructure exhibited SERS enhancement factor approximately 105. The study can help us to combine nano-metals and nano-particles...
The spin polarization at the surface of Fe nanoclusters has been probed using a spin-polarized metastable helium beam. The clusters, produced in a gas aggregation source, display a lognormal size distribution with a peak centered at ~11 nm. Varying coverages of both spheroid- and cuboid-shaped particles were concomitantly deposited onto clean Si(111) substrates for investigation with the extremely...
Regularly faceted copper (Cu) particles ranging from tens of nanometers to submicron were obtained by annealing Cu-Zr films on polyimide and single Si (100) substrates. XRD, TEM, SEM and EDS were used to characterize their microstructural properties. The results show that these particles are pure Cu element and single crystals with [111] preferred orientation. Systematical analysis demonstrates that...
Here we report on the fabrication of GaAs network of nanowires on silicon (111) substrates using gold metal nanoparticle mediated catalyst. Highly ordered regular arrays of gold nanoparticles are formed by vacuum evaporation of Au through a nanosphere spin coated surfaces. The paper examines and compares the structural properties of GaAs nanowires formed by chemical beam epitaxy and molecular beam...
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