Distinguished researchers, at what wavelength iron oxide nanoparticles display surface plasmon resonance peak?

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Shavkat Nizamov

There are no free electrons in iron oxide, correspondingly, there are no plasmons.

Jules Lloyd Hammond

Further to the response from Shavkat Nizamov ,

You may find the theory section from the following article useful:

Article Localized Surface Plasmon Resonance as a Biosensing Platform...

Shiv Shankar

Thank you ever so much @ Shavkat Nizamov and @ Jules Lloyd Hammond Sir for you answer and suggestion.