Can the band gap of Graphene be calculated using raman Spectra in case of few layer graphene flakes?

More Md.Akibul Islam's questions See All

What is the difference between L1 and L2 regularization in machine learning?

L1 and L2 regularization

28 February 2021 4,187 3 View

Can I put a figure that was drawn by Bio-Render in publication paper?

I want to publish paper in journal but I have figures which have drawn with bio-renders, can I put them in the paper or which other software I can use to draw them?

27 February 2021 8,179 1 View

How to simulate 5G Quality of Service characteristics?

For my research, I would like to simulate an end to end 5G network. My goal is to observe the behaviour of SDAP protocol, dynamic configuration of 5QI values etc. To summarize I would like to...

21 February 2021 7,624 3 View

What is the best substrate for exfoliating few layers of hexagonal boron nitride (hBN) using traditional scotch tape method?

Unlike graphene, it is usually very difficult to exfoliate few layers (~10 nm thick) of hBN on SiO2 substrate due to lip-lip interaction at the edges. Au substrates have been proven very useful...

16 February 2021 2,635 2 View

Which power-to-heat (P2H) devices do you think are likely to play the most crucial role in the European energy transition?

Power-to-heat (P2H) shows how we can use renewables for heating. Power-to-heat technologies have been on the market for quite some time now, with heat pumps being the most important. However, they...

10 February 2021 9,250 2 View

Why we use feature normalization before using the Gaussian kernel in SVM?

Support vector machine

09 February 2021 6,405 3 View

How is KNN different from k-means clustering?

machine learning

09 February 2021 8,757 9 View

What is bagging and boosting in Machine Learning?

machine learning

09 February 2021 5,156 3 View

Do the introduced salts (NaOH/ HCl) influence the spectroscopic shifts of the fluorescence excitation-emission matrix?

During the resin (XAD-8) fractionation of wastewater salts (NaOH or HaCl) are used for acid or base elutions/pH adjustments. Since the amount of introduced salt is minimal, so is it required to...

08 February 2021 9,489 2 View

Do you think it is feasible to have a 100% Renewable Energy-based Electricity System in Bangladesh in the distant future?

In Bangladesh, the proved reserved of natural gas 34 TCF which will lead the country next 20 years and currently 82% natural gas consumed in the power sector for power production. Whereas only 3%...

01 February 2021 251 12 View

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 2021 0 0 View

Formulation of polymer color flakes

I am writing to request some information for making polymer color flakes. I would appreciate the help.

17 March 2021 0 0 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

12% ledeburitic cold work tool steel, etched for revealing retained austenite, any help for clarifying?

Hello everyone. Given microstructure image belongs to a 12% ledeburitic cold work tool steel (annealed and tempered). The sample was etched with picral (100 mL ethanol and 4 g picric acid). I...

02 March 2021 4,119 3 View

What are anisotropic electrical and optical properties of a semiconductor due to?

In some materials, properties such as band gap, thermal conductivity differ along different crystallographic axes. What are the basics?

01 March 2021 1,923 3 View

How Can I bring as much common elements in steel as possible to calculate stable phase(s) in OpenCalphad?

As I was tweaking step-by-step OpenCalphad6 Macros step1.ocm involving phase and thermal property calculation of a High-speed steel, I could not incorporate more than 6 elements in the steel...

01 March 2021 8,840 1 View

How can you bring two structures together to create an adhesive bond in LAMMPS?

I have created an Ice 1h crystalline structure and an Aluminium substrate structure and equilibrated both at 250K. Now I need to bring them together in a way that an adhesive bond is created....

01 March 2021 3,325 2 View

What are the new 2D nanomaterials were used for Silver nanoparticles stabilization?

In the stabilization of AgNPs are vital in current research interest. However, some of the 2D nano-materials like graphene oxide, MoS2, etc... previously used to stabilize it. But still they shown...

01 March 2021 2,207 3 View

What is the density for pva electrospining?

I'm Juan Carlos, a high school student who is working with electropinning, I made an electropinning machine with a 21g needle and a 30kv high voltage source and the distance between my needle is...

28 February 2021 298 3 View

Is anyone familiar with the cyclic compressive fatigue testing (BS EN 12697 - 25) ?

I would like to get more information on the cyclic compressive fatigue testing (BS EN 12697 - 25) which is typically done for bituminous material in pavement design. Any one can advise on the...

28 February 2021 2,004 3 View

Anand P S Gaur

No.

Md.Akibul Islam

Dear D. Curtis Guild,

Thank you for your suggestions. Could you please direct me towards a relevant paper?

Md Tawabur Rahman

You can calculate number of layers in graphene flakes using Raman Spectroscopy, not bandgap. You can measure UV-Vis for a very dilute concentration of graphene dispersion to find the bandgap. Hope it will help.

Thanks!

Dear Dr. Md Tawabur Rahman ,

Thank you for your reply. Could you please point me towards any relevant paper/s which explain the measurement of bandgap of graphene using UV ViS?

Thank you

Dear Akib,

You can read the following manuscripts.

Article Band Gap Engineering of Chemical Vapor Deposited Graphene by...

https://www.nature.com/articles/nnano.2014.307

Dr. Md Tawabur Rahman , thank you so much for sharing these papers. I really appreciate your kind help.

Thank you Akib. Good luck!

Rafael Nunes Gontijo

Actually, you can't measure the bandgap of graphene, because it is very small, but you may be able to measure the singularities in twisted graphene systems like this one:

Article Resonance Raman spectroscopy in twisted bilayer graphene

Meenaketan Sethi

Dear Md.Akibul Islam,

It's not possible to determine the bandgap of the Graphene, but porous graphene's band gap determination could be possible. Please read the attached article.

Sethi, M., Bantawal, H., Shenoy, U.S. and Bhat, D.K., 2019. Eco-friendly synthesis of porous graphene and its utilization as high performance supercapacitor electrode material. Journal of Alloys and Compounds, 799, pp.256-266.

All the best.