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In this study, alumina, silica and alumina-silica binary (36% mol silica) thin films are synthesized using the sol-gel technique. These form the basis for future gas separation membranes. The characterization of the synthesized oxides was performed using nitrogen physisorption, X-ray diffraction (XRD), Doppler-broadening measurements on the 511keV annihilation photon peak, together with 3γ/2γ analysis,...
Positron beam techniques have been employed to characterise low-k dielectric silica based films, which have two or three dimensional structures of nanometre size pores. Pore fractions vary from 5 to 50%. Positrons implanted in the layer slow down and eventually annihilate with the electrons from the layer. However, in pores of the dielectric films positronium (Ps) is formed before annihilation takes...
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