Hi! I´m having problems trying to identify any compounds in this Raman spectrum. I´ve used a 532 nm laser.
This is a spectrum obtained from a steel ball, rubbed against a Bi2S3 coating. I´ve checked in other papers for the characteristic bands of Bi2S3, Bi2O3, magnetite, hematite, etc but I´m a little bit thrown off, specially for the bands at 1465 and 1520 cm-1.
Any ideas?
Thank you!!
Germa'n,
I am not particularly familiar with the samples you are working with as I specialize in biological materials. However, a quick search online may provide you with some guidelines on how to resolve the peak positions for your measurements and make tentative assignment.
Since you explained that you rubbed a steel ball against a Bi2S3 coatings, I think it might be prudent looking up Raman peak tables for
1) steel (assuming - Chrome alloy steel balls, these comprise about 90% of all balls manufactured. This material is a high carbon (1.00%), chrome (1.36%) alloy steel) and
2) Bismuth sulfide
Additional, I would research a good internal standard or compounds that I would run to try to confirm peaks.I have uploaded a couple of reads you may find helpful. I suspect you are picking up on the chrome from the steel alloy and/or perhaps the D- G- bands formed from the sulfide-carbon bond (Article Facile Synthesis of Bi2S3-C composite microspheres as low-co...
)Best of luck!
Thank you very much Theresah for your response and the time dedicated to your answer!
For what I can see, Bi2S3 has peaks at much lower values of raman shift, below 300 cm-1. It is interesting that the chrome in the AISI 52100 ball could be showing activity in the 1400-1500 cm-1 range, I´ll look into it. Probably I´m getting a mixture of iron and/or chromium oxides on the contact zone.
Kind regards,
Germán
In general, SS contains carbon in the ranges of 0.05% to 4%. The two peaks at 1520cm-1 and 1460cm-1of Raman spectra may suggest the formation of graphene oxide (reduced) at the interface. It could be confirmed by observing another broad peak in the ranges of 2600 cm-1 to 3000 cm-1.
you may go through the link Article Self-assembly of mildly reduced graphene oxide monolayer for...
Dear Dr. Sukhendu Jana , thank you very much for your response!
I´ll take a look at the possibility of having graphene oxide in the surface. Do you believe it is possible for the carbon to oxidize before the iron in the steel?
Thank you very much Dr. Aurelio Sanz Arranz for your observation. Indeed, I had fluorescent lights on during the measuring, but it is the first time I´m picking up these signals. Perhaps it could be due to the geometry of the steel sphere that´s reflecting the light from the ceiling. I´ll do them again with the lights off! Great tip, thank you very much!
Best regards,
Germán
- Badges
- Science topic
- Similar topics
- Social Science
- Media
- Journalism