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Urszula Dettlaf-Wegl,Viera Skakalova,Jannik Meyer,Jiri Cech,Bernd G. Mueller,Siegmar Roth 한국물리학회 2007 Current Applied Physics Vol.7 No.1
We present a comparative study of uorinated single wall carbon nanotubes and C60 peapods. The uorination was carried out byxenon diuoride treatment at moderate temperature (100.C). The uorination level was determined by EDX. In empty nanotubes aometry of C4F). TEM images show that this uorination procedure does not aect the peapod structure. The elemental mapping carriedout by EELS reveals homogenous distribution of uorine along the carbon nanotube bundle. This chemical treatment is found to changethe electrical properties of carbon nanotubes in bucky papers. Four-probe measurements indicate a conductivity decrease by up to twoorders of magnitude at room temperature. The temperature dependence of the conductivity indicates a signicant change in the chargecarrier density of this system. Moreover, a non-linear behavior of theIV characteristic is observed below 50 K in uorinated peapods.
Random telegraph noise in carbon nanotubes and peapods
장성호,이상욱,이동수,H.Y. Yu,Urszula Dettlaf-Wegl,캠벨,Siegmar Roth,박영우 한국물리학회 2006 Current Applied Physics Vol.6 No.6
The switching of resistance between two discrete values, known as random telegraph noise (RTN), was observed in individualsingle-walled carbon nanotubes (SWNTs) and C60-lled SWNTs (the so-called peapods). The RTN has been studied as a functionof bias-voltage and gate-voltage as well as temperature. By analyzing the features of the RTN, we identify three dierent types ofRTN existing in the SWNT related systems. While the RTN can be generated by the various charge traps in the vicinity of theSWNTs, the RTN for metallic SWNTs is mainly due to reversible defect motions between two metastable states, activated by inelas-tic scattering with ballistic electrons. On the other hand, the noise for peapods can be attributed to the motion of C60 molecules inhollow space of SWNTs.