Am functionalizing a nanomaterials with polymers , if there is a sharp (more absorption) and broad (less absorption) bands FTIR spectra at same wavenumber for same compound (two methods) , does it mean polymer attached less to NPs surface if FTIR shows small(broader) peak instead of showing sharp peak ?
Thank you
Hello dear, Hello dear, when somebody functionalize a material, by FTIR you can obtain functionalization degree by using a calibration curve, which is obtained form blends of functionalizing agent and matrix, since in the functionalization process occur a chemical reaction between functionalizing agent and matrix. If you want to calculate the functionalization degree, You can obtain a calibration curve from standard and make a graph of intensity of absorption band (this appear in the functionalizing agent, but it is not present in a matrix, for example polymer. Furthermore, it is proportional or have to increase with the concentration of functionalizing agent ) vs concentration of functionalizing agent. In FTIR, the intensity of the signal is proportional to the concentration or amount of the functional group, for it ussually is employed height to make the quantitation process.
Hello dear, Hello dear, when somebody functionalize a material, by FTIR you can obtain functionalization degree by using a calibration curve, which is obtained form blends of functionalizing agent and matrix, since in the functionalization process occur a chemical reaction between functionalizing agent and matrix. If you want to calculate the functionalization degree, You can obtain a calibration curve from standard and make a graph of intensity of absorption band (this appear in the functionalizing agent, but it is not present in a matrix, for example polymer. Furthermore, it is proportional or have to increase with the concentration of functionalizing agent ) vs concentration of functionalizing agent. In FTIR, the intensity of the signal is proportional to the concentration or amount of the functional group, for it ussually is employed height to make the quantitation process.
1st a small correction. The "intensity" is not proportional to the concentration. The relation is given by the Lambert-Beer law.
2nd some details may help to interpret your real question. Which vibrations do you investigate? How is the spectrum obtained(often FTIR is qualitative but often hardly quantitative)? Is the the investigated vibrational group bond to the surface?
I don't think so. For FTIR, you must find specific peaks which correspond to the polymer and one more thing------FTIR cannot detect certain substance if its content is lower than 5%.
Thank you very much Edwin A. Murillo, Michael Schmitt , and Yixiao Dong
Also, you can look for answer in this question:
https://www.researchgate.net/post/What_does_the_increase_or_decrease_in_Peak_intensities_in_ATR-FTIR_spectra_mean
https://www.researchgate.net/post/What_does_intensity_signify_in_FTIR_Spectra
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