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Mesostructured polyaniline/single-wall carbon nanotube (PAni/SWCNT) composite film has been prepared through electrochemical polymerization/degradation processing. The microstructures of the films are observed before and after electro-degradation. Initial twisty SWCNT bundles are broken down and linked by the polymerization of PAni. Both crystalline and disordered PAni regions coexist in the PAni/SWCNT...
An in situ coating technique was developed to prepare a manganese dioxide/multi-walled carbon nanotube (MnO 2 /MWCNT) composite, which exhibits excellent energy storage capacity. An alkaline KMnO 4 solution was first used to oxidize and open the ends of pristine MWCNT, and citric acid was then added as a reductant to form the composite. TEM, HR-TEM, XRD, TG–DSC, FT-IR, Raman and XPS...
A multi-step procedure has been developed to cut and purify single-walled carbon nanotubes (SWCNTs) from the pristine soot synthesized by catalytic chemical vapor decomposition, which contains significant amount of multiwalled carbon nanotube (MWCNT) impurities. The procedure involves refluxing in dilute HNO 3 solution followed by (NH 4 ) 2 S 2 O 8 /H 2...
Fe 3 O 4 beads, with average diameters of ca. 180nm and narrow size distribution, were self-assembled along multiwalled carbon nanotube (MWCNT) and formed necklace-like nanostructures through a simple, effective and reproducible hydrothermal method. TEM, SEM, XRD and SAED were used to characterize the as-synthesized samples. Results indicate these Fe 3 O 4 beads were...
Novel carbon nanotube-NiFe 2 O 4 composite materials have been prepared for the first time by in situ chemical precipitation of metal hydroxides in ethanol in the presence of carbon nanotubes (CNTs) and followed by hydrothermal processing. The obtained composite powders were characterized using XRD, TEM and EDS. The effect of surface oxidation treatment of CNTs on their properties...
The surface properties of carbon nanotubes have been changed by heat treatment with ammonia to yield a basic surface or with N 2 to yield an acidic surface without destroying the integrity of the nanotubes. The dispersion state of CNTs could be much improved by the adsorption of a cationic dispersant of poly(ethylenimine) (PEI) or an ionic dispersant of sodium dodecyl sulfate (SDS). Through...
Through various modifications of carbon nanotubes (CNTs), gold nanoparticles were selectively attached to the nanotube and the locations of functional groups were further confirmed. Using cationic polyethyleneamine or anionic citric acid as the dispersant, the surface properties of CNTs could be changed to yield a basic or acidic surface. By electrostatic interaction, the CNTs could be successfully...
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