We investigated single-walled carbon nanotubes (SWNT) and DNA-SWNT hybrids by atomic force microscopy (AFM).
From the AFM observation of several different types of SWNTs and DNA-SWNT hybrids in air, we found several
specific differences in morphology among the samples. Longer SWNT molecules were observed when the SWNT was
dispersed using a bath type sonicator. When a probe type sonicator was used, the SWNT became short obviously. The
phenomenon was common in all of our experiments, thus, the phenomenon was independent on the types SWNTs.
SWNT functionalized with polyethyleneglycol (PEG SWNT), amino group (NH2 SWNT), and carboxyl group (COOH
SWNT) showed individual specific features in AFM images. Although NH2 SWNT is typically soluble in organic
solvents, uniform distribution was observed when DNA molecules were mixed with NH2 SWNT. Finally, we observed
DNA-SWNT hybrids by AFM in liquids for the first time. DNA-SWNT hybrids were significantly swollen in the
aqueous solution even though the sample was dried once. This is helpful information for considering biological
applications of the DNA-SWNT hybrids.
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Kazuo Umemura ; Takuya Hayashida ; Daisuke Nii ; Yuki Yamaguchi and Takuya Kawashima
Structures of hybrids of DNA and carbon nanotubes in air and in liquids
", Proc. SPIE 8793, Fourth International Conference on Smart Materials and Nanotechnology in Engineering, 87931W (August 9, 2013); doi:10.1117/12.2026757; http://dx.doi.org/10.1117/12.2026757