Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Counting Graphene Sheets Spread over a Large Area

Abstract:
A simple way to identify the number of graphene sheets on a substrate, even over a large area, is shown by US researchers.

Counting Graphene Sheets Spread over a Large Area

Riverside, CA | Posted on August 11th, 2011

Graphene is the much-loved material of-the-moment; the most recent Nobel Prize for physics was awarded to Andre Geim and Kostya Novoselov for work in this area and many researchers are following in their footsteps to investigate the exciting electric, optical, and mechanical properties of graphene. But even just identifying that you have produced a graphene sheet, and how many you have made, can be tricky.

Industrial production of graphene is usually by chemical vapor deposition (CVD) rather than by the mechanical exfoliation method (tearing off sheets from a block of graphite) much used in early work. CVD-grown sheets can be relatively very large, which is good for many industrial applications, but this method does induce some defects and wrinkles which can be hard to spot, as well as producing multiple layers of sheets. Raman and atomic force microscopy can be used to count sheets on silica or silicon but these techniques call for calibration and can only cover a small area at a time; this is not ideal for the large areas of graphene produced by CVD. As its uses expand, graphene is being made and used on a variety of substrates so it would be useful to have a method of counting that is not confined to use on only a small number of surfaces.

Advertisement




Researchers at University of California, Riverside, USA, led by Cengiz Ozkan and Mihrimah Ozkan have developed a method for quick and easy identification of layer thickness and uniformity of entire large-area graphene sheets on arbitrary substrates. They exploit the fact that graphene quenches fluorescence whereas most substrates do not, and coat an area of graphene on a surface with a fluorescent polymer dye to allow visualization with a simple fluorescence microscope. Straightforward data processing of this input identifies not only the presence but also the number of layers of graphene present in any one area. Uniformity of the sample and defects can also be assessed by this route.

The scientists went on to test their method by looking at different ways of transferring graphene from one substrate to another, and the resulting quality of the final sheets. They were able to tell the most effective method used to transfer graphene and preserve sheet quality.

Because this method is so simple, reproducible, and applicable to large areas of graphene, the authors expect it to be quickly taken up by industrial manufacturers and users of graphene, who may use it to make anything from solar cells to thermal heat sinks.

####

For more information, please click here

Copyright © John Wiley & Sons

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

J. R. Kyle et al., Small, ; DOI: 10.1002/smll.201100263

Related News Press

News and information

Harris & Harris Group Notes Announcements by Its Portfolio Companies During the Third Quarter of 2016 September 30th, 2016

INVECAS to Enable ASIC Designs for Tomorrows Intelligent Systems on GLOBALFOUNDRIES' FDX Technology: INVECAS to Collaborate with GLOBALFOUNDRIES to Provide IP and End-to-End ASIC Design Services on 22FDX and 12FDX Technologies September 30th, 2016

How to power up graphene implants without frying cells: New analysis finds way to safely conduct heat from graphene to biological tissues September 30th, 2016

Innovation in Nanotechnology is Focus of Symposium: Annual event brings international experts to Northwestern Oct. 6 September 29th, 2016

Cambrios at CEATEC - Japan 2016 September 29th, 2016

Graphene/ Graphite

How to power up graphene implants without frying cells: New analysis finds way to safely conduct heat from graphene to biological tissues September 30th, 2016

Discoveries

How to power up graphene implants without frying cells: New analysis finds way to safely conduct heat from graphene to biological tissues September 30th, 2016

Nanosensors could help determine tumors ability to remodel tissue: Measuring enzyme levels could help doctors select appropriate treatments September 29th, 2016

Fighting cancer with sticky nanoparticles September 27th, 2016

Gold nanoparticles conjugated quercetin inhibits epithelial-mesenchymal transition, angiogenesis and invasiveness via EGFR/VEGFR-2 mediated pathway in breast cancer September 27th, 2016

Announcements

Harris & Harris Group Notes Announcements by Its Portfolio Companies During the Third Quarter of 2016 September 30th, 2016

INVECAS to Enable ASIC Designs for Tomorrows Intelligent Systems on GLOBALFOUNDRIES' FDX Technology: INVECAS to Collaborate with GLOBALFOUNDRIES to Provide IP and End-to-End ASIC Design Services on 22FDX and 12FDX Technologies September 30th, 2016

How to power up graphene implants without frying cells: New analysis finds way to safely conduct heat from graphene to biological tissues September 30th, 2016

Innovation in Nanotechnology is Focus of Symposium: Annual event brings international experts to Northwestern Oct. 6 September 29th, 2016

Solar/Photovoltaic

Cambrios at CEATEC - Japan 2016 September 29th, 2016

Crystalline Fault Lines Provide Pathway for Solar Cell Current: New tomographic AFM imaging technique reveals that microstructural defects, generally thought to be detrimental, actually improve conductivity in cadmium telluride solar cells September 26th, 2016

Semiconducting inorganic double helix: New flexible semiconductor for electronics, solar technology and photo catalysis September 15th, 2016

New perovskite research discoveries may lead to solar cell, LED advances September 12th, 2016

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic