The evaluation of individual dispersion of single-walled carbon nanotubes using absorption and fluorescence spectroscopic techniques.
We have investigated the degree of dispersion of single-walled carbon nanotubes (SWNTs) in solution using laser spectroscopic techniques. SWNTs were suspended in aqueous media using a sodium dodecyl sulfate (SDS) surfactant. SWNTs with different dispersion states were prepared by controlling the intensity and duration of sonication and centrifugation. The absorption and fluorescence spectroscopic techniques were employed to characterize the different dispersion state of the prepared samples. Nanotube suspensions with better dispersion showed higher fluorescence and sharper absorption peaks. The fluorescence data were characterized as a function of the nanotube chirality, and absorption peak shifts were analyzed depending on the first and second van Hove singularities (vHs) of semiconducting nanotubes.
SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, Korea.
Dokyung
D
Yoon
Sun-Jung
SJ
Kang
Jae-Boong
JB
Choi
Young-Jin
YJ
Kim
Seunghyun
S
Baik
D000042:Absorption; D003102:Colloids / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013050:Spectrometry, Fluorescence / Q000379:methods*
D003102:Colloids; D037742:Nanotubes, Carbon