Dear all, this is a very normal and common indication of the polymer functional groups(s) interaction with the metal. My Regards

Dear Dr. Shahid Ahmad,

I suggest you to have a look at the following paper:

- Study on antibacterial alginate-stabilized copper nanoparticles by FT-IR and 2D-IR correlation spectroscopy

Judith Díaz-Visurraga, Carla Daza, Claudio Pozo, Abraham Becerra, Carlos von Plessing, and Apolinaria García

Int. J. Nanomedicine., 7: 3597–3612 (2012)

Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3405878/

Best regards, Pierluigi Traverso

Dear all, this is a very normal and common indication of the polymer functional groups(s) interaction with the metal. My Regards

Dear all, attached another very interesting paper. My Regards

Hi;

Usually, for alginate-metal composites, the most useful characteristic bands obtained by FTIR spectroscopy are asymmetric and symmetric -COO stretching vibration. The displacement of these two bands towards the low values could be attributed to the interactions developed between polymer and metal. For more information on the types of interactions, please see the attached document.

With my best regards