CVD Graphene Films

CVD Graphene Films

CVD Graphene Films are known to have the highest quality, however, the properties of polycrystalline materials are often dominated by the size of their grains and by the atomic structure of their grain boundaries. These effects are especially pronounced in two-dimensional materials, where even a line defect can divide and disrupt a crystal. These issues take on practical significance in graphene, a hexagonal two-dimensional crystal of carbon atoms; Single-atom-thick graphene sheets can now be produced by chemical vapor deposition (CVD) on up to meter scales, making their polycrystallinity almost unavoidable. Theoretically, graphene grain boundaries are predicted to have distinct electronic, magnetic, chemical, and mechanical properties which strongly depend on their atomic arrangement. Yet, because of the five-order-of-magnitude size difference between grains and the atoms at grain boundaries, few experiments have fully explored the graphene grain structure. Images reveal an unexpectedly small and intricate patchwork of grains connected by tilt boundaries. Correlating grain imaging with scanned probe and transport measurements, shows that these grain boundaries dramatically weaken the mechanical strength of graphene membranes, but do not as dramatically alter their electrical properties. This opens a new window for studies on the structure, properties, and control of grains and grain boundaries in graphene and other two-dimensional materials.

What is Graphene?

Graphene is a one atom thick sheet or film of carbon atoms. It is strong yet low weight and it conducts heat and electricity. In fact, graphene is the most thermally conductive material known to man. Scientists had theorized about graphene for decades before it was successfully synthesized in the lab in 2004 by Geim et al. It is two-dimensional, it interacts favorably with light and with other materials.  Graphene is a highly crystalline carbon sheet. Carbon atoms are densely packed in a regular hexagonal sp2 bonded structure. It can best be envisioned as a one-atom thick layer of graphite. CVD graphene films are the building block for graphene based electronic and photonic devices.

CVD Graphene Transfer

CVD graphene transfer is available for substrates such as PET that can’t withstand the CVD Graphene Synthesis processing temperatures.  The CVD Graphene film can be transferred to other substrates by a variety of methods such as using solvents to release the film from the substrate in a liquid medium and floating it onto a different substrate.

Atomic Structure of Graphene

A representation of the atomic structure of CVD Graphene Films, note the precise carbon atom arrangement in a monolayer graphene film

CVD Graphene Films Raman Spectra

The raman spectra for our CVD Graphene Films is below.

CVD Graphene Films Images

An SEM image of our CVD Graphene Films

A TEM image of our CVD Graphene Films

An optical microscope image of our CVD Graphene Films

CVD Graphene Films Quality control

All our CVD Graphene Films are subjected to a rigorous quality control in order to ensure a high quality and reproducibility of the graphene. CVD graphene films quality control methods are;

Raman Spectroscopy: I(G)/I(2D)<0.5; I(D)/I(G)<0.05

Optical Microscopy inspection of each individual sample to ensure good transfer quality and purity

If your application requires more specific controls (AFM, SEM…) please do not hesitate to contact us.

CVD Graphene Films Applications

Some of the many CVD Graphene Films applications include Flexible displays, ITO replacement, Graphene research, OLEDs