Hello, I am doing a carbon surface modification with Gold nanoparticles.
from the FTIR below, I know the formation bond of NH3 and for COO , but I would like to know what is the range of thiol bond formation, is this FTIR good or not?
note that I know that the difference between the bare SPE and modified SPE is the increase of current which is measured by Potentiostat.
thanks in advance.
Hi Aseel Alnaimi
First of all FTIR is a good tool to detect the functional groups or types of chemical bond present a material but it is not good enough to detect all the fuctional groups or dopament or the phase. You may perform the XRD of your Au-doped/mofied/engrafted carbon sample to check the phase purity also. You may perform EDS to cheak the overall idea of the element present in your synthesized sample. Thio peak can be found at ~2600-2500 cm-1 region in the FTIR snlysis.
You may go through this: DOI:10.1088/0957-4484/20/36/365602.
From my side, I can say the above.
Regards
Dear Aseel Alnaimi, the above FTIR spectrum is not appropriate given the fact that the corresponding transmission percentages of all peaks are higher than 90% signifying that the sample content in your KBr pellete has been rather too low. In such a condition, on account of low signal to noise ratio, some characteristic peaks are embedded in the noise level and cannot be detected at all. So, I suggest you either repeate the FTIR analysis once more with a well-prepared KBr pellete or use ATR-FTIR technique which can provide you with a higher S/N ratio for the surface functional groups. However, FTIR spectrum might not solely justify what you are dealing with but if it is accompanied with other surface characterizations especially XPS, it will most likely lead to a more rational conclusion. Please note, the characteristic peaks of the carbon materials are usually of low intensity, that is why it is mostly preferred to use XPS as a more reliable technique for inspecting their chemical structure.
Best,
Arnab Mukherjee, thank you very much for your information, Do you think that EIS is better than XRD? we can compare the difference of current peaks for Bare and modified sample. as mentioned on the attached paper, the current reponse may increase.
Mahdi Ghamsari, thank you sir for sharing this, I used the thiol as a linker in this experiment to investigate the presence of thiol on the surface of the modified electrode, I did this trial many times, but I will repeat the FTIR as you mentioned. I would like to excuse you to be informed by the new result.
Karri trinadha Rao , Many thanks! Got it .
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