Electronic Properties of Semiconducting Polymer-Functionalized Single Wall Carbon Nanotubes

Abstract

New hybrid materials were synthesized by functionalizing single wall carbon nanotubes (SWCNTs) with different semiconducting species. Vinyl quinoline monomers bearing electron accepting groups or even its ruthenium complex were used as organic semiconductors. UV− vis−NIR absorption spectroscopy, X-ray photoelectron spectroscopy and thermogravimetric analysis were used in order to qualify the resulted materials. Optical characteristics were studied by photoluminescence spectroscopy in neutral and acidic media. The electronic structure of the valence band and the surface electronic properties of the materials in the form of thin films developed on Si substrates were studied by ultraviolet photoelectron spectroscopy. Raman spectroscopy revealed the charge transfer mechanism between the polymer and the carbon nanotube while the recorded Raman resonance profiles showed significant changes in the transition energies and the widths of the resonance windows due to chemical modification of SWCNTs.

A review of the interfacial characteristics of polymer nanocomposites containing carbon nanotubes

“…At a local length scale, ultraviolet-visible-near infrared absorption spectroscopy can be used to determine the dispersion state of single-walled carbon nanotubes in solutions and nanocomposite materials qualitatively. [65][66][67][68][69] This is because only individual or small bundles of single-walled carbon nanotubes exhibit sharp absorbance peaks, 65 which can be termed as van Hove singularities. In contrast, large bundles, associates with the poor dispersion of carbon nanotubes, exhibit only monotonically decreasing absorbance with increasing wavelength.…”

Conductive properties and mechanisms of different polymers doped by carbon nanotube/polypyrrole 1D hybrid nanotubes

“…[5][6][7] Besides, finding new CNTs-based multi-component fillers would be a new way to achieve this goal. Up to now, chemical functionalization methods, such as covalent grafting, 8,9 doping, 10 and ion beam treatment have been used to improve the intertube contact, but these methods inevitably disturbed the conjugated system of CNTs and thus impair the conductive properties of the resulting composites. Over the past few years, hybrid CNTs fillers with no destruction to conjugated structure of CNTs have been synthesized to fabricate CNTs/polymer composites with reduced consumption amount of CNTs.…”

Synthesis and Optoelectronic Characterization of Perylene Diimide-Quinoline Based Small Molecules

“…All other solvents and reagents were purchased from Aldrich or Alfa Aesar and were used without further purification unless otherwise stated. 4-(2-tetrahydropyranyloxy) phenylboronic acid [41], 6-Bromo phenyl-(2-perfluorophenyl)-4-phenyl-quinoline (Br5FQ) [32], 6-phenyl-(2-perfluorophenyl)-4-phenyl-quinoline (Ph-5FQ) [33] 6-bromo-(2-pyridinyl)-4-phenyl-quinoline (Br-QPy) [35] and the catalyst palladium (II) tetrakis triphenyl2phosphine [Pd (PPh 3 ) 4 ] [47] were synthesized according to published procedures.…”

“…Generally, quinolines were shown as electron-transport molecules and have been studied by our group combined with fullerene derivatives, as electron acceptor materials or additives for OPVs [32,33,34]. Herein, 6-bromo-(2-pyridinyl)-4-phenyl-quinoline (Br-QPy) [35,36,37] or 6-bromo-(2-perfluorophenyl)-4-phenyl-quinoline (Br-5FQ) [32] and 6-phenyl-(2-perfluorophenyl)-4-phenyl-quinoline (Ph5FQ) were used as substituents at the bay area of PDI, using two different synthetic strategies to afford non-planar PDI molecules. The final molecules showed high solubility and were evaluated in terms of their optical and electrochemical characteristics and all share the same advantages imposed by the PDI units, forming non-planar structures of PDI with redshifted absorption profiles and low lying LUMOs.…”