Why I am not getting peak in the Raman spectra for ZnO nanoparticles?

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Ulf Nobbmann

The effect is probably related to particle size.

http://aip.scitation.org/doi/abs/10.1063/1.2901159?journalCode=apl

the smaller the nanoparticle size, the stronger the observed signal.

See also "zno-based semiconductors studied by raman spectroscopy" by Marcel Schumm, full pdf on researchgate

Naveed Hussain

I couldn't agree anymore with Mr.Ulf Nobbmann. However, it is only to add in his answer. Since, we don't know whether you have performed RAMAN analysis using different excitation wavelength? I suggest you to go through literature and then try this.