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 Purity : over 99.95%
• *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.