Thank you very much for such an amazing presentation. I will be starting to work on Raman soon and this sure did give me a lot of valuable information. Looking forward to more videos!
Very good video! I want to thank you for sharing this as I used Raman for long but don't know that I can use it for some very handy measurement of photoluminescence.
David great presentation, thank you. i am playing with a Raman at work and i am looking work out the full range for the spectra that it can achieve. Would you have a suggestion of a common material that would have some structured Raman bands as well as PL signal much like the MoS2 you showed? Perhaps something a little less exotic? All the best and thank you again.
I suggest acquiring a sample of aluminum oxide (Al2O3) or perhaps a small piece of sapphire. Both of these materials consist primarily of Al2O3 from which the the Raman bands originate and very likely Cr impurities from which the photoluminescence occurs.
Great video indeed! I have been studying Raman and PL spectra of Transition metal dichalcogenides such as WS2 and MoS2. Thus I have come through your article on Raman PL of MoS2. I have a few questions for you. Have you done the same for WS2 nanosheets as well? If so, where are the positions of PL peaks for WS2 nanosheets? Can we do such type of simultaneous Raman PL study in any kind of Raman spectrometer?
Thank you for your encouraging comments. Yes, I have performed Raman spectroscopy and photoluminescence of two-dimensional (2D) WS2. You may find my Spectroscopy publication on that work online (www.spectroscopyonline.com/view/raman-photoluminescence-imaging-of-2d-ws2). The photoluminescence of WS2 appears at approximately 630 nm depending upon the number of layers and strain. Note the variation of the emission peaks in Fig. 1 of the online Spectroscopy publication. And yes, you should be able to obtain photoluminescence spectra with most Raman spectrometers.
If the link that I posted does not take you to the publication, I suggest that you go to the Spectroscopy home page (www.spectroscopyonline.com/). From there you should go to the March 2021, Volume 36, Issue 3 of Spectroscopy and Pages: 9-12.
@@dtuschel thank you so much for the link. Is there any limit to the layer numbers above which the nanoflake doesn't show PL? Coz, I haven't obtained such PL peaks while performing Raman spectroscopy studies. I was using Ranishaw model.
I know that there is a limit to the number of layers beyond which no photoluminescence will occur, but I don't know the specific number of layers that constitute that limit. The strongest photoluminescence is usually detected from a single layer.
@@dtuschel have you carried out the PL analysis of the few layer WS2 and MoS2 nanosheets in colloidal system? I haven't obtained the said PL peaks even for the few layer colloidal system.
Thank you very much for such an amazing presentation. I will be starting to work on Raman soon and this sure did give me a lot of valuable information. Looking forward to more videos!
You're most welcome
Very good video! I want to thank you for sharing this as I used Raman for long but don't know that I can use it for some very handy measurement of photoluminescence.
I am glad that you found it helpful and thank you for letting me know.
David great presentation, thank you. i am playing with a Raman at work and i am looking work out the full range for the spectra that it can achieve.
Would you have a suggestion of a common material that would have some structured Raman bands as well as PL signal much like the MoS2 you showed? Perhaps something a little less exotic?
All the best and thank you again.
I suggest acquiring a sample of aluminum oxide (Al2O3) or perhaps a small piece of sapphire. Both of these materials consist primarily of Al2O3 from which the the Raman bands originate and very likely Cr impurities from which the photoluminescence occurs.
@@dtuschel fantastic! Thank you for the reply. I will have a go with this tomorrow. All the best again.
@@dtuschel well finally got around to doing this and it worked out great. Thank you again! Atb
Great video indeed! I have been studying Raman and PL spectra of Transition metal dichalcogenides such as WS2 and MoS2. Thus I have come through your article on Raman PL of MoS2. I have a few questions for you. Have you done the same for WS2 nanosheets as well?
If so, where are the positions of PL peaks for WS2 nanosheets? Can we do such type of simultaneous Raman PL study in any kind of Raman spectrometer?
Thank you for your encouraging comments. Yes, I have performed Raman spectroscopy and photoluminescence of two-dimensional (2D) WS2. You may find my Spectroscopy publication on that work online (www.spectroscopyonline.com/view/raman-photoluminescence-imaging-of-2d-ws2). The photoluminescence of WS2 appears at approximately 630 nm depending upon the number of layers and strain. Note the variation of the emission peaks in Fig. 1 of the online Spectroscopy publication.
And yes, you should be able to obtain photoluminescence spectra with most Raman spectrometers.
If the link that I posted does not take you to the publication, I suggest that you go to the Spectroscopy home page (www.spectroscopyonline.com/). From there you should go to the March 2021, Volume 36, Issue 3 of Spectroscopy and Pages: 9-12.
@@dtuschel thank you so much for the link. Is there any limit to the layer numbers above which the nanoflake doesn't show PL? Coz, I haven't obtained such PL peaks while performing Raman spectroscopy studies. I was using Ranishaw model.
I know that there is a limit to the number of layers beyond which no photoluminescence will occur, but I don't know the specific number of layers that constitute that limit. The strongest photoluminescence is usually detected from a single layer.
@@dtuschel have you carried out the PL analysis of the few layer WS2 and MoS2 nanosheets in colloidal system? I haven't obtained the said PL peaks even for the few layer colloidal system.