Adsorption behavior of DNA-wrapped carbon nanotubes on self-assembled monolayer surfaces.
We have examined the adsorption of DNA-wrapped single-walled carbon nanotubes (DNA-SWNTs) on hydrophobic, hydrophilic, and charged surfaces of alkylthiol self-assembled monolayers (SAMs) on gold. Our goal is to understand how DNA-SWNTs interact with surfaces of varying chemical functionality. These samples were characterized using reflection absorption FTIR (RAIRS), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. We have found that DNA-SWNTs preferentially adsorb to positively charged amine-terminated SAMs and to bare gold surfaces versus hydrophobic methyl-terminated or negatively charged carboxylic acid-terminated SAMs. Examination of the adsorption on gold of single-strand DNA (ssDNA) of the same sequence used to wrap the SWNTs suggests that the DNA wrapping plays a role in the adsorption behavior of DNA-SWNTs.
Zangmeister
Rebecca A
RA
National Institute of Standards and Technology, 100 Bureau Drive, MS 8362, Gaithersburg, Maryland 20899-8362, USA. Rebecca.Zangmeister@nist.gov
Maslar
James E
JE
Opdahl
Aric
A
Tarlov
Michael J
MJ
D000327:Adsorption; D004247:DNA / Q000737:chemistry*; D004563:Electrochemistry; D006046:Gold / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D037742:Nanotubes, Carbon / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013057:Spectrum Analysis; D013059:Spectrum Analysis, Raman; D013499:Surface Properties; D014965:X-Rays
D037742:Nanotubes, Carbon; D006046:Gold; D004247:DNA