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About Nanofibers
The nanofibers in our papers are the PR25 product from Applied Sciences Inc. in Cedarville Ohio. These tubular nanofibers consist of ’stacked cup’ or ’spiral sheet’ graphene planes, with the edges of the planes along the tube’s surface. These two structures are so close in morphology that they cannot be distinguished by Transmission Electron Microscopy.
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Stacked Cup Structure |
Spiral Sheet Structure |
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This is a TEM of a nanofiber that has been heat treated to 3000 C. The general stacked-cup structure is visible. Close examination shows that the graphtization treatment has caused the surface edge sites to fold over and bond with adjacent graphene planes. |
PR25 nanofibers are grown in the vapor phase at around 1000 C. They are ~60 nm in diameter, with a length of 10-100 microns. They contain traces of iron and sulfur from the catalyst used to grow them. Their surface area is ~ 40 meters squared /g.
This TEM image shows the wall structure of a PR25 nanofiber
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