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Interaction of single-walled carbon nanotubes with poly(propyl ether imine) dendrimers
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Molecular structure of third generation PETIM dendrimer [G3-(NH2)] (MW: 3356 g mol−1); (b) instantaneous snapshot of G3-(NH2)-SWNT (unprotonated case) complex; and (c) G4-(NH2)-SWNT (unprotonated case).

Image of FIG. 2.
FIG. 2.

Absorbance spectrum of an aqueous solution dendrimer (0.5 mM), aqueous suspension of SWNT (25 μg cm−3) and an aqueous solution of dendrimer–SWNT complex.

Image of FIG. 3.
FIG. 3.

Percentage quenching efficiency of an aqueous G3-(NH2) dendrimer (0.5 mM) (pH ∼4) solution, as a function of weight ratio of nanotube vs dendrimer (λ ex = 330 nm). The inset shows dendrimer fluorescence spectra after additions of an aqueous SWNT suspension (25 μg cm−3) and fluorescence spectrum of only aqueous suspension of SWNT (25 μg cm−3) for comparison.

Image of FIG. 4.
FIG. 4.

(a) IV characteristics of SWNTs device made by using dielectrophoresis of SWNTs dispersion (in DCE). (b) I DS vs back-gate voltage (V GS). (c) Increase in the normalized resistance of SWNTs device with the addition of dendrimer solutions of concentrations: 0.5 and 0.1 mM (pH ∼9), 0.1 mM (pH ∼4) (denoted by 0.1 mM P).

Image of FIG. 5.
FIG. 5.

Tangential Raman modes of SWNTs recorded using an excitation energy of 1.96 eV.

Image of FIG. 6.
FIG. 6.

Instantaneous snapshot of nanotube with (a) G3 protonated dendrimer at the end of 20 ns long MD simulation and (b) G4 protonated dendrimer at the end of 26 ns long MD simulation

Image of FIG. 7.
FIG. 7.

Radial distribution functions between the carbon atoms of nanotube and nitrogen of the primary amine groups of dendrimers (a) G3 and (b) G4, at unprotonated and protonated states.

Image of FIG. 8.
FIG. 8.

The time evolution of the distance between the center of mass of nanotube and the center of mass of dendrimers of protonated and unprotonated states for (a) G3 and (b) G4 PETIM dendrimers.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Interaction of single-walled carbon nanotubes with poly(propyl ether imine) dendrimers