Chiral Polymer–Carbon‐Nanotube Composite Nanofibers

Abstract

Optically active polyaniline–carbon‐nanotube nanocomposites are synthesized by using a solution‐chemistry method. The stereochemical selectivity of the composites can be tailored by controlling the nanotube loading. At low nanotube contents (<3 wt %), the chiral composites show high absolute stereochemical selectivity. The figure shows normalized circular dichroism spectra of the composites with different nanotube/monomer weight ratios in aqueous solutions.

Electrodeposition of Chiral Polymer–Carbon Nanotube Composite Films

“…[11] This value is typical for the oligomer used in this study since the commercially available phenyl-amine-capped dimer chosen is not the most effective oligomer reported. [6,11] The trend of the stereoselectivity of the composites as a function of the nanotube content by electrochemistry method further supports our latest study on the same composite system by a solution chemistry method, [24] and may shed light on the role of the nanotubes in the electro-polymerisation of the composites. Owing to the anionic nature of the acid-treated MWNTs and CSA, both species act as the current carrier in the suspension and as the dopant in the deposit during the electropolymerisation of aniline.…”

“…Circular dichroism (CD) spectra confirm that the MWNT content may tailor the stereoselectivity of the polymer backbone conformation. The optical activity of the chiral composites is similar to that obtained by using the chemical method in our recent study, [24] but the method takes advantage of electropolymerisation to control the growth of uniform films by varying the chain-growth potential without the requirement of an oxidizing agent.…”

“…MWNTs used in this study were functionalized with carboxyl (ÀCOOH) and hydroxyl A C H T U N G T R E N N U N G (ÀOH) groups through acid treatment [24] in order to be dispersed in the aqueous electrolyte consisting of aniline monomer, chiral inducing agent CSA and oligomer. Simultaneous UV-absorption and CD spectra were measured according to the principles described by Drake et al [26] with the dissymmetry g-factor defined as the ratio CD/(Absorbance 32980).…”

Electrical Conductivity Studies of Polyaniline Nanotubes Doped with Different Sulfonic Acids

“…Zhang et al have demonstrated that the polymeric acid has significant effect on the morphology and size of the polyaniline nanotubes [5]. Many techniques have been used to synthesize PANI nanostructure such as stirring [6][7][8], static placement, [9] sonication [10][11][12], and emulsion polymerization [13][14][15][16]. Particularly, conducting polymer nanotubes and nanofibers have received growing interest in recent years due to their unique properties and promising potential applications in nanodevices [17][18][19][20][21].…”

Multiwalled carbon nanotube/SiO2composite nanofibres prepared by electrospinning

“…Specifically, composite nanofibres using carbon nanotubes (CNTs) produced by electrospinning have attracted interest because of the electrical, thermal, mechanical and chemical properties of CNTs [5][6][7][8]. Though CNT/polymer composite nanofibres and CNT/TiO 2 nanofibres prepared by electrospinning have been studied by other research groups [9][10][11][12][13], CNT/SiO 2 composite nanofibres have not yet been studied.…”