What is the absorbance peak or SPR for nanoparticles in uv-vis spectroscopy?

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Marie Berthuel

Hello B R Siddharth

I would suggest to read this paper : Article Silver Nanoparticles: Synthesis, Characterization, Propertie...

Best regards,

Marie B.

Alan F Rawle

This topic has been extensively discussed on ResearchGate. Search on this site first.

Rina Singh

SPR is Surface Plasmon Resonance ( collective oscillation of conduction electrons of a metal) and since you are addressing nanoparticles it is generally called Localised Surface Plasmon Resonance since the oscillation is localized in nm region. It is different for different metals and depends on shape, size and dielectric environment of surrounding medium. When frequency of oscillation matches with the frequency of electromagnetic field , due to this resonance phenomena metal absorbs light of particular frequency and that is measured in terms of absorbance.

Virendra Nath Rai

In continuation with Rina Singh , the LSPR peak for silver nano particles vary from ultra violet to violet region of spectrum depending on its size and shape. However for gold nano particles it is 510 nm onwards again depending on its shape and size.

Dheeraj Kumar

Open-source UV-Vis Spectroscopy Library for Nanomaterials,

https://www.instanano.com/2021/01/uv-vis-open-source-reference-liberary.html