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Die Bindung von Polynucleotiden an einwandigen Kohlenstoffnanoröhren: Einfluss der Temperatur
Author(s) -
Gladchenko G.O.,
Lytvyn O.S.,
Karachevtsev M.V.,
Valeev V.A.,
Leontiev V.S.,
Karachevtsev V.A.
Publication year - 2011
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201100738
Subject(s) - carbon nanotube , stacking , polymer , nanotube , adsorption , absorption (acoustics) , materials science , polymer chemistry , chemistry , chemical engineering , nanotechnology , composite material , organic chemistry , engineering
The effect of the change of the temperature (in the range from 20°C to 90°C) on the light absorption intensity of water suspensions of nanohybrids formed with single‐walled carbon nanotubes (SWNT) and single‐stranded polyriboadenylic acids, poly(rA), and polyribocytidylic acids, poly(rC), was studied. Different degrees of the polymer coating of nanotube surfaces were found by atomic force microscopy (AFM). According to UV‐vis absorption spectroscopy data, homopolymer adsorption onto the nanotube is followed with changes in optical characteristics of both, the polymer and SWNT, as a result of ππ‐stacking interaction of the polymer with the tube surface. Upon poly(rA) wrapping on the nanotubes, a significant part of its bases keeps self‐stacking while upon adsorption of the more rigid poly(rC), it is almost completely disordered. Spectroscopic data can be explained by a polymer re‐orientation on the nanotube with the heating that provides the optimal ππ‐stacking of nitrogen bases with the carbon surface. The increase of the temperature up to 90°C does not result in the polymer slipping off the nanotube and in a noticeable nanotube precipitation.