What kind functional group absorb in Frequency 1140 cm (-1) in CuO nanoparticles sample?

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Thomas Mayerhöfer

How do you synthesize your Nanoparticles?

Nofi Yanti

Dear Mr. Thomas,

I used Copper Sulfate and Urea as preventing aggregation agent. Then the mixture heated in 80 degrees for 5 hours.

Ok, then my guess is that it is the v3 vibration of the SO42- - Ion. See for comparison the attached papers. In particular, CuO has much less bands...

Article Determination of the dielectric tensor function of triclinic...

Article Employing spectra of polycrystalline materials for the verif...

Dear Mr Thomas,

Thank you for your kindness to solve my problem. I read from many journals about CuO Nps, peak in 1140 cm (-1) assignated to free OH steaching. Is it possible if Free OH vibration resulted sharp peak in 1200-1110 cm (-1) region?

My pleasure! -O-H stretching vobrations can be found in the broad range between 3000 and 3800 cm-1 and are often quite broad due to hydrogen-bridges. Water also shows a bending vibration around 1650 cm-1 (less intense), which, I think, could also be found in your spectrum. Alkanoles show a peak around 1150 cm-1 due to -C-O- vibrations. It could not be Urea since there is no -C=O vibration somewhere around 1700 cm-1. From width, intensity and structure I would still opt for the v3 vibration of the SO42- - Ion. However, the comparably small bands above 3500 cm-1 let me believe that there must also be some -N-H left in your particles.

Bogusz Stepak

Dear Thomas,

Could you provide a source for information: " Water also shows a bending vibration around 1650 cm-1 (less intense) "

Thank you.

There are literally thousands out there. I just picked one by random:

Article Ab Initio Infrared Spectrum of Liquid Water

You find what you are looking for (and some more references) in the first two sentences of the introduction.

Thank you very much. I have one more problem with a band assignment. I've got a spectrum of PLLA polymer after hydrolysis which is rich of COOH groups in the region of 3290 cm-1 but toghether with this peak I noted rise of bands at 1650 cm-1 and also at 1540 cm-1 (which are not nromally present in PLLA) . As I found in answers above 1650 cm-1 could be water. What it could be at 1540 cm-1? I attach spectrum.