AVS 52nd International Symposium
    Nanometer-Scale Science and Technology Friday Sessions
       Session NS-FrM

Paper NS-FrM8
Structural, Optical, and Electrical Properties of Functionalized SWNTs with DNA and Metal Nanoparticles

Friday, November 4, 2005, 10:40 am, Room 210

Session: Nanotube Processing and Properties
Presenter: G.-H. Jeong, NTT Basic Research Laboratories, Japan
Authors: G.-H. Jeong, NTT Basic Research Laboratories, Japan
A. Yamazaki, Tokyo University of Science, Japan
S. Suzuki, NTT Basic Research Laboratories, Japan
Y. Kobayashi, NTT Basic Research Laboratories, Japan
K. Furukawa, NTT Basic Research Laboratories, Japan
K. Torimitsu, NTT Basic Research Laboratories, Japan
Y. Homma, Tokyo University of Science, Japan
Correspondent: Click to Email
Because of the outstanding physical, chemical and electrical properties of carbon nanotubes (CNT), a number of applications in various fields are expected. Especially, extensive CNT-functionalization researches have been performed to control electronic property because diameter- or chirality-controlled growth has not realized yet. Recently, we have performed the experimental approach to create CNT-based novel hybrid structures and demonstrate here the results. DNA and Au nanoparticles (NP) are selected to functionalize CNT due to their specific assembling property. By controlled chemical vapor deposition, single-walled carbon nanotubes (SWNTs) were successfully synthesized not only on flat substrate but also on Si-pillar substrate which allows suspending nanotubes. SWNTs-functionalization was performed by covalent coupling between carboxyl and amine groups. DNA/Au hybrids were made using thiolated-DNA and Au NP and confirmed by UV-visible absorption spectroscopy. Finally, SWNTs were modified with Au NP or DNA/Au hybrids. The density of Au NP attached along the suspended SWNTs was controlled by changing treatment time and concentration of the Au colloid. In Raman characterization, we observed new peaks at radial breathing band after Au NP attachment, which may be caused by surface-enhanced Raman scattering. Photoluminescence peaks were also detected from the SWNTs/Au hybrids and will be investigated the effect of Au functionalization. The intensity change of radial breathing band and defect band in Raman spectra was also observed from the SWNTs/DNA/Au hybrid, which implies the different electronic or optical properties are expected. These results show functionalized CNT can be further developed to electronic and optical applications. @FootnoteText@ @footnote 1@NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan @footnote 2@CREST, JST, c/o Dept. of Physics, Tokyo University of Science, Tokyo 162-8601, Japan