Cu nanoparticles coated w/ gelatin will either shift to longer or shorter wavelengths (shown is UV-VIS) as time of storage increases. Where would it most likely shift and why?
Thanks!
Cu nanoparticles (around 10 nm) should absorb around 574 nm in water. In my experience, when oxidation takes place to get back to the Cu2+ a depletion on the absorbance intensity is observed. Now, if the oxidation product is rather CuO, so, a red shift would be observed and the scatter around 800 nm should increase...If gelatin proctects the nanoparticles against oxidation I would expect the CuNP last longer without changes on their surface plasmon. Hope this can be helpful.
So, when it is oxidized to CuO, shifting will be to the right or to longer wavelengths? Thanks!
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