AFM images of a nanocomposite silver/epoxy show "particles" very large (from 0.3 up to 2 micron) and SEM images show mixtures of particles of silver in resin of similar sizes. The UV-Vis absorption spectra show optical resonance.
Uv visible absorption spectrum may be due to presence of nanoparticles.
If u disperse in a suitable solvent, sonicate and then record uv, you will get good SPR?
Dear Victor
The size of typical silver nanoparticles are in the range of 1nm to 100nm. There are UV-Vis spectra of different AgNPs shown in the following website link.
http://www.cytodiagnostics.com/store/pc/viewcontent.asp?idpage=11
In your case, you may have bonding epoxy attached on the AgNPs. If you want to have small size of your nanocomposite, you should use fine AgNPs for your nanocomposite starting materials.
Victor Rentería
Epoxy resin is a product of the condensation of epichlorohydrin with bisphenol, which has aromatic (benzene groups). Together with silver nanoparticles, the composition should show SERS. This complex ratio of plasmon resonance to the SERS effect led you to an unexpected question. The link Xuhua Wang shows the nominal relationship of size with the visible spectrum of electromagnetic waves.
Plasmon resonance is observed in the particle size from few nm to tens of nm. However increasing particle size broadens the plasmon resonance peak. The presence of NPs in epoxy resin will furhter broaden the plasmon resonance. If the particle size is in micron or sub micron range then UV-Vis spectra will be even more broad and complex.
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