Charge-transfer interaction in single-walled carbon nanotubes with tetrathiafulvalene and their applications.
We observed that single-walled carbon nanotube (SWNT) was aligned in the presence of TTF This alignment was induced by a specific interaction between SWNT and tetrathiafulvalene (TTF), a well-known organic donor. The interaction between the two molecules can be explained by a charge-transfer, which was confirmed by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The binding energies of S (2P1/2) and S (2P3/2) were shifted from 163.0 eV and 164.1 eV to 163.9 eV and 165.1 eV, respectively. In Raman spectra of the SWNT-TTF, three peaks of SWNT in radial breathing mode were also upshifted by 4-5 cm(-1). The charge-transfer interaction also contributed in modifying the electronic structure of SWNT and furthermore enhanced the electrical conductivity of SWNT. A more conductive thin film was fabricated using the SWNT-TTF Four-probe measurement revealed that the surface resistance of the SWNT-TTF film was reduced to 4.359 omega at room temperature while that of SWNT film was 6.894 omega. These results enable carbon nanotubes to be utilized more for practically for industrial applications in fabricating peculiar nano-sized building blocks.
Kim
Jin-Sun
JS
Korea Basic Science Institute, Jeonju Center, Jeonju 561-756, Korea.
Choi
Kyuseok
K
Kim
Ju-Jin
JJ
Noh
Dong-Youn
DY
Park
Sang-Kyu
SK
Lee
Ha-Jin
HJ
Lee
Haeseong
H
D003460:Crystallization / Q000379:methods*; D004579:Electron Transport; D006571:Heterocyclic Compounds / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D055672:Static Electricity; D013499:Surface Properties
D006571:Heterocyclic Compounds; D046911:Macromolecular Substances; D037742:Nanotubes, Carbon; C063887:tetrathiafulvalene