Bandgap energy using Kubelka Munk function (DRS data Analysis) - 07

Diffuse Reflectance Spectroscopy (DRS) is a scientific technique used to probe the optical band gap energy of nanomaterials. Here in this video, I have used the Kubelka-Munk function along with the Tauc plot method to determine the optical band gap energy of Titanium Dioxide. This is the first video of DRS data analysis using the Kubelka-Munk function on KZbin. If you have any questions, please feel free to ask me in the comment section.
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[@bestrong6517]

I cannot THANK YOU enough

[@dr.udayabhanucgowda6818]

Thank you very much. It is very helpful to me.

[@garrytalaroc]

Great Video!

[@ANP-]

Thank you very much

[@ChopParadise]

Thank you so much

[@waelamer1502]

thank you so much. could you please tell me how to change the reflactance data versus wavelength into absorbance versus wavelength?

[@lovinganuj92]

Excellent video, i was trying to plot the same from reflectance but could not able to do so, your video made it so clear

[@nanoworld6122]

Glad it helped!

[@salopriyan]

Fantastic video! Very useful!

[@nanoworld6122]

Glad you think so!

[@habtamuabdisa3244]

Thank you very much for sharing us this knowledge sharing video.

[@nanoworld6122]

Glad it was helpful!

[@user-bq6rd4oj4n]

Your video is fantastic!! Thank you so much!! I have a question, in "F(R)hv plot" there are many linear area (video 10:02). Then, which one should I choose when there are many linear invervals? Is it first one??

[@mehranvaezi6649]

perfect teaching thanks a lot

[@nanoworld6122]

Thank you.

[@naufalhidayat7039]

Thanks a lot, its very helpful

[@nanoworld6122]

Glad it was helpful!

[@ricardohoffmannvalencia6771]

Thank you very much!

[@nanoworld6122]

You're welcome!

[@muhammadnisarqasim636]

sir what is relation if we increased the wavelength and what would effect on bandgap.

[@Zim-en7oy]

How about the SRUV plot? Is it same method?

[@MelodicRiddles]

Hello sir very informative video but I have one small question. In C column why you use 1240? Is there any specific reason for that?

[@prateektripathi366]

Can we apply the same method for Raman spectra? Kindly explain

[@muthusaru3527]

Sir does this formula substitution applicable in origin pro 8 mine is 32 bit processor

[@tathanhhoaiqui1488]

thanks for you video, can I use this Kubelka munk function from UV-vis absorbance?

[@prasannahemz]

Thanks a lot, please explain BET isotherm

[@angelomazzarino3691]

Hi, I want to research on color matching, Do you know about this topic?

[@allanramonedearaujoscharnb1334]

Great video. Could you please explain Cut-Off calculate?

[@MrAhmednew]

Thank you very much .how can I get this excell sheet ?

[@mengnanzhu5984]

Very straightforward tutorial! Thank you. My question is, how to determine n (in your video you used 2?

[@nanoworld6122]

It depends upon the nature of the materials. First of all, you have to check it for n = 2, If the graph didn't fit (tangent will not fit) for n = 2 then you have to check it for n = 1/2, It will probably fit on it.

[@MUHAMMADABDULLAH-qw2rt]

Superb video and explanation. The use of English is also simple so that everyone can understand. But I have a doubt. Why do you use the value of Col(C) in the place of hv??

[@junminnie]

My sample is also TiO2 , but I used exponential of 1/2, because most papers used 1/2, and TiO2 also has indirect bandgap in nature, is that ok? Because since you also calculated for TiO2 but you used 2

[@nooralam2797]

I also use n = 2, as anatase phase of TiO2 have indirect band gap

[@banda9518]

thankyou so much for the video!! fastastic. is there other methods to confirm about the band gap of the compound? if so please highlight. thankyou in advance

[@nanoworld6122]

The photoluminescence spectra.

[@valeriejacobson8370]

Can you explain how you determine the value of the exponent n in equation 2?

[@nanoworld6122]

Good day Valerie Jacobson! The exponent "n" in equation represent nature of transition, i.e. n = 2 for direct band gap semiconductor and n = 1/2 for indirect semiconductor. How ho know about your material has direct band-gape or indirect? You have to plot the Tauc plot for both n=2 and n=1/2 and check it, if your material has direct band-gap, then there will be a sudden drop (the value of Y-axis will decrease rapidly) in Tauc plot for n=2, and if your material has indirect band-gap then there will no sudden drop in Tauc plot for n= 2. Then you have to plot and check your data for n=1/2. You will definitely observed the sudden change in Tauc plot either for n=2 or n = 1/2 and this is how you will get to know your material has direct or indirect band-gap. if you still have problem, then send me your data at [e-mail] i will plot it for you. Thank you.

[@HariShankar-eg1bk]

Can we use this method to find optical band gap for Pure polymer films ?

[@nanoworld6122]

yes

[@juicekoo]

But is there anyway to convert absorbance to reflectance?

[@adripastor182]

A= - log(R) where A is Absorbance; R is reflectance. R must not be expressed in %. So, if you have a value of %R= 77,78 % , then R is 0,7778. So, A= 0,1086

[@samiiistatus54]

This is direct band gap or indirect band gap

[@letienthai7120]

If F (x) does not appear, what should we do?, please help me...

[@nanoworld6122]

Then you are probably using an older version of the OriginLab. Install 9.0 or above version.

[@nanoworld6122]

However, F(x) option is also available in older versions, but it is hidden. (1) Left-click on column (2) Go to set column values (3) Write your formula there

[@poyuyang490]

well, this video save my ass

[@laeciosantoscavalcante3479]

It seems to have been used the value (2) for a solid direct optical gap band type system !!:!:!: OK ??? If it should not be (1/2) for indirect band gap. OK ???

[@nanoworld6122]

Yes

[@remyann686]

How to know a UV-visible spectroscopy = Diffuse Reflectance Spectroscopy or Absorption UV-visible Spectroscopy

[@nanoworld6122]

In absorbance spectroscopy, we record the spectra as wavelength vs absorbance or wavelength vs transmittance, while in DRS spectroscopy we record it as wavelength vs reflectance.

[@remyann686]

Thank you. In addition, I would like to ask more questions. Can we use both cases for one UV-visible Spectroscopy( as DRS and Absorption Uv-visible Spectroscopy)? I noted that I could use both A vs wavelength and R vs wavelength for my lab Uv-visible Spectroscopy.