alexa Abstract | Determination of Graphene Layers by Optical Imaging Contrast Analysis
ISSN ONLINE(2319-8753)PRINT(2347-6710)

International Journal of Innovative Research in Science, Engineering and Technology
Open Access

Like us on:
OMICS International organises 3000+ Global Conferenceseries Events every year across USA, Europe & Asia with support from 1000 more scientific Societies and Publishes 700+ Open Access Journals which contains over 50000 eminent personalities, reputed scientists as editorial board members.

Open Access Journals gaining more Readers and Citations

700 Journals and 15,000,000 Readers Each Journal is getting 25,000+ Readers

This Readership is 10 times more when compared to other Subscription Journals (Source: Google Analytics)

Research Article Open Access


Practical application of graphene require accurate determination of the number of layers. In this paper we demonstrate a reliable and efficient approach for determining the number of graphene layers. Plots of contrast spectra against number of graphene layers transferred on Borosilicate glass substrates for RGB image, R, G, and B channels were found to increase linearly. The R channel contrast values for one to four graphene layers were found to be 0.076(R), 0.083(R), 0.090(R), and 0.097(R) respectively. Similarly, the G contrast channel values were obtained as - 0.032(G), -0.023(G), -0.015(G), and -0.007(G) whereas B channel gives 0.004(B), 0.011(B), 0.019(B), and 0.026(B) for SLG, BLG, Tri-layer and Tetra-layer graphene respectively. The contrast values for SLG in RGB transmission regions were found to be 0.076(R), -0.032 (G), and 0.004(B). Our experimental results deviate from theoretical contrast of SLG transferred on SiO2 (285nm )/Si, Quartz, Al2O3 (72 nm)/Si and Hexagonal-BN crystal substrate. This deviation is shown to arise from the unappreciable optical absorption of the Borosilicate substrate in the visible spectrum range. Contrast imaging is therefore a reliable method with the R contrast channel providing the highest contrast leading into increased resolution of the detection level of samples.

To read the full article Peer-reviewed Article PDF image

Author(s): Benjamin Mbaluka John, Paul Kimeu Ngumbi, Katumo Ngei, Simon Waweru Mugo, Nelson Soitah Timonah, James Mbiyu Ngaruiya


Single-layer graphene, Few-layer graphene, Multilayer graphene, thickness identification, optical contrast., Fluid Dynamics

Share This Page

Additional Info

Loading Please wait..
Peer Reviewed Journals
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version