Antibacterial photocatalytic activity of different crystalline TiO phases in oral multispecies biofilm.

Objective: Titanium dioxide (TiO) incorporation in biomaterials is a promising technology due to its photocatalytic and antibacterial activities. However, the antibacterial potential of different TiO crystalline structures on a multispecies oral biofilm remains unknown. We hypothesized that the different crystalline TiO phases present different photocatalytic and antibacterial activities.

Influence of substrate on the structure of predominantly anatase TiO films grown by reactive sputtering.

TiO films are grown on LaAlO (001), Si (100) and SiO substrates by reactive radio frequency sputtering. X-ray diffraction (XRD) pole figures revealed important characteristics about the texture and phase distribution on those films. Combined with spectroscopic ellipsometry, the pole figures allowed the analysis of the growth characteristics over the whole volume of the layers.

Polarity-Induced Selective Area Epitaxy of GaN Nanowires.

We present a conceptually novel approach to achieve selective area epitaxy of GaN nanowires. The approach is based on the fact that these nanostructures do not form in plasma-assisted molecular beam epitaxy on structurally and chemically uniform cation-polar substrates. By in situ depositing and nitridating Si on a Ga-polar GaN film, we locally reverse the polarity to induce the selective area epitaxy of N-polar GaN nanowires.