Study of modified solid surfaces by nanostructured CdSe in SiO _x thin films

Abstract

The study of biomineralization is inspiring new approach to the controlled fabrication of synthetic "biomimetic" materials such as nanostructured semiconductors [1,2]. To prepare model surfaces on titanium substrates, two groups of samples: (i) SiO x : C dSe multilayers (MLs) and (ii) CdSe nanometer-sized crystals embedded in SiO x matrix, called composite films (CFs), have been produced applying two regimes of well established physical vapour deposition at room temperature. Fourier Transform Infrared Spectroscopy (FTIR), Infrared Microscopy (IRM), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDX) studies have been carried out. The ability of SiO x : C dSe MLs to induce crystallization in simulated body fluid (SBF) was tested. To enhance the process of crystal growth, laser-liquid-solid interaction (LLSI) was induced by pulsed laser irradiation. It is shown that the nanofabricated SiO x : C dSe layers might be exploited as model of biomineralization.

Hydroxyapatite Growth on Glass/CdSe/SiO_x Nanostructures

“…The Ca and P concentrations were 1.5 times higher than those used by Kokubo [3]. Furthermore, a novel method for the HA growth was applied, namely laser-liquid-solid interaction (LLSI) [4]. It includes simultaneous immersion of the samples in the fluid and irradiation by a pulsed laser (CuBr, λ = 578,2 nm, output power 330 mW, power density 50 MW/cm 2 ) focussed on the substrate surface.…”