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1 Department of Materials Engineering, Tatung University, Taipei 104, Taiwan, R.O.C.
2 Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan, R. O. C.
| The absorption mechanism and electrical properties of Single Wall Carbon Nanotube bundles (SWCNTs) are examined with high-resolution C K-edge X-ray absorption near-edge structures (XANES) using the synchrotron radiation facility at NSRRC, Taiwan. The X-ray absorption experiments show that an effective desorption of oxygen and hydrocarbon from the surface of SWCNTs can be achieved by evacuating to high vacuum at 500K for several hours. The p-type behavior of SWCNTs exists in pure CO gas and will become the n-type behavior when SWCNTs has preadsorbed the oxygen. The experiments also show that the amphoteric property in electrical behavior of SWCNTs is determined by the oxygen absorption. |
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