I have Raman spectra of silver-anatase nanocomposite film. But how can I determine from the spectra that if these are oxidised silver ions, or reduced silver nanoparticles?
But when mixed with TiO2, Silver nanoparticles will increase the Raman scattering of the anatase phase compared to the pure TiO2 due to SPR. If I am right.
I guess You could use pyridine in order to prove the presence of arrays of silver nanoparticles by SERS. However this will never be a definite prove. If you want information on oxidation state of silver XPS is your best choice.
"But when mixed with TiO2, Silver nanoparticles will increase the Raman scattering of the anatase phase compared to the pure TiO2 due to SPR. If I am right." well but you can´t see it :-) you have to use xps or pxrd!!
I would suggest to use SEM (the Ag particles should appear "light" or "white", the TiO2 would be darker), the nanoparticles should be fixed on conductive adhesive which needs to be grounded.
Plus, you should use XPS.
Did you register an electronic absorption spectra? If the Ag NPs are not oxidized you should see the characteristic SPR band. In my opinion this is the best way to see it, of course you can complete that information by running PXRD.
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