The loading process of functionalized silica nanoparticles was investigated in order to obtain nanoparticleshaving functional groups on their surface and Near-Infrared (NIR) emission properties. The NIRemission induced by O2 loading was studied in silica nanoparticles, produced by pyrogenic and microemulsionmethods, with size ranging from 20 to 120 nm. Loading was carried out by thermal treatmentsin O2 atmosphere up to 400 C and 90 bar. The effects of the thermal treatments on the NIR emission andon the structural properties were studied by luminescence and Raman techniques, whereas themorphological features were investigated by Transmission Electron Microscopy and Atomic Force Microscopy.Our data show that silica nanoparticles produced by pyrogenic technique can be loaded withO2 at lower temperature than the ones obtained by microemulsion and have a higher luminescenceintensity due to the internal porosity of the latter. The treatments do not affect the nanosize of themicroemulsion particles and provide NIR emitting probes of selected size. Post-processing surfacefunctionalization of the pyrogenic nanoparticles does not affect their emission properties and provideshigh efficiency NIR emitters with functionalized surface.
|Numero di pagine||7|
|Rivista||Materials Chemistry and Physics|
|Stato di pubblicazione||Published - 2013|
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