Typical Raman spectrum of a single layer film on Copper Foil

Explanation of Raman spectrum

1. Raman spectroscopy is used to check the presence of a D peak in graphene samples. If a D peak is present, then this can indicate defects in the sample, such as cracks or flaking.
2. The ratio of the heights of the 2D peak and the G peak indicate the number of graphene layers.
   2D>G : Single-layer
   2D=G : Double layer
   2D<G : more than triple layer
3. 3 measurements for every sample are taken and presented on the same graph.

Optical Microscope Image of Single-layer Graphene on Copper foil

Properties of single-layer graphene

• Graphene quality and thickness are confirmed by Raman spectroscopy.
• Multi-point Raman data are provided with every sample.
• Graphene layer is continuous with few small multilayer islands and overall coverage exceeding 95%.
• Sheet resistance is < 1,000 ohm per square.
• Optical transmission is > 95%.
• Copper foil thickness: 35 micron.
• All samples are manufactured in our lab in Japan.
• Shipping: Please allow 3-5 business days by International EMS or 2-3 business days by DHL or FedEx.