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Browsing School of Pure, Applied and Health Sciences by Author "Motochi, I."

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Ion beam modification of the structure and properties of hexagonal boron nitride: An infrared and X-ray diffraction study

Aradi, E.; Naidoo, S.R.; Billing, D.G.; Wamwangi, D.; Motochi, I.; Derry, T.E. (Nuclear Instruments and Methods in Physics Research B, 2014-03)

The vibrational mode for the cubic symmetry of boron nitride (BN) has been produced by boron ion implantation of hexagonal boron nitride (h-BN). The optimum fluence at 150 keV was found to be 5 Â 1014 ions/cm2. The ...
Metal–semiconductor ohmic contacts: An ab initio Density Functional Theory study of the structural and electronic properties of metal–diamond (111)-(1 × 1) interfaces

Motochi, I.; Makau, N.W.; Amolo, G.O. (Diamond & Related Materials 23, 2012)

Metal contacts on clean, hydrogenated and oxygenated diamond surfaces have been studied using ab initio Density Functional Theory (DFT). Five metals, i.e., gold, titanium, tantalum, vanadium and palladium on the three ...
Surface Brillouin scattering in ion-implanted chemical vapor deposited diamond.

Motochi, I.; Mathe, B. A.; Naidoo, S. R.; Derry, T. E. (ScienceDirect, 2016)

Acoustic waves occurring within an ion-damaged region of CVD diamond were studied using surface Brillouin scattering (SBS). By indirect scattering, the surface acoustic wave (SAW)-like mode of pure diamond, as well as those ...
Surface Brillouin scattering observation of higher order resonances in annealed, ion-implanted CVD diamond

Motochi, I.; Mathe, B.A.; Naidoo, S.R.; Wamwangi, D.; Derry, T. E. (Science Direct, 2017-06)

The phase velocity of Surface Acoustic waves exhibits no dispersion in homogeneous materials. However, normal or anomalous dispersion takes place in layered systems. This dispersion effect has been used to determine the ...
Surface Brillouin scattering on annealed ion-implanted CVD diamond

Motochi, I.; Naidoo, S.R.; Mathe, B.A.; Erasmus, R.; Aradi, E.; Derry, T.E.; Olivier, E.J. (Diamond & Related Materials 56, 2015-04)

Single crystal b100N diamond samples were implanted with a total fluence of 1.5 × 1016 ions/cm2 at single en- ergy of 150 keV using carbon ions. This implantation fluence created a damage density that would not restore ...

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