Besides there are so many UV peaks and these results are not in accordance with the results of other researchers in any way. XRD patterns show formation of pure CuO and ZnO particles but I am not satisfied with the results of UV. I have performed it several times but got the same results. CuO showed peaks at 270 and 273 while ZnO showed peaks at 290 and 320.
'so many peaks' - could you provide an example.
Sounds like you are at concentration well above the linear range showing effect of multiple scattering.
Which type of UV instrument, you are using? Moreover, when you are performing UV analysis, are you doing auto zero with the blank solution?
What extinction do you speak about. Peaks are in general unusual for UV-vis. Band gaps or bands are more common.
First the results satisfy because all oxide materials have wide band gaps and tend to shorter wavelengths, additionally if the materials nano this mean greatly tend to shorter wavelengths. also you can using energy gap or band gap are more common and better to determined the material or compound and the law is easy Eg=1239.83/lamda nm, therefore, the energy gap of CuO equal 4.59-4.54 eV and for ZnO 4.27-3.87 eV. second the results energy gaps for both are very good.
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