Fabrication of Magnetic Carbon Nanotubes Using a Metal‐Impregnated Polymer Precursor

Abstract

γ‐Fe2O3‐impregnated magnetic carbon nanotubes (CNTs) have been fabricated by the carbonization of polypyrrole (PPy) nanotubes. It is found that PPy nanotubes form graphitic structures at a low temperature (800 °C). Magnetic CNTs (see Figure) show ferromagnetic behavior even at 300 K and the main magnetic phase of the CNTs is γ‐Fe2O3. This novel fabrication approach is expected to provide an alternative way to fabricate CNTs.

Large‐Scale Synthesis, Annealing, Purification, and Magnetic Properties of Crystalline Helical Carbon Nanotubes with Symmetrical Structures

“…[13] Foreign materials have been encapsulated inside CNTs by methods such as wet chemical insertion, capillary suction, in situ arc discharge, and catalyzed hydrocarbon pyrolysis. For example, i) the fabrication of carbon-coated Fe nanorods by the pyrolysis of ferrocene in vacuum, [14] ii) the production of Co-filled CNTs by using an alumina membrane as a template, [15] and iii) the filling of Fe into CNTs via a metal-impregnated polymer precursor [16] have been demonstrated.…”

Formation of 1D Poly(3,4‐ethylenedioxythiophene) Nanomaterials in Reverse Microemulsions and Their Application to Chemical Sensors

“…[44] Importantly, the geometry of the reverse micelles is readily affected by key parameters, such as the concentration of surfactant, amount of water, addition of salt, and variations in temperature. [45,46] Under our experimental conditions, [47][48][49] the addition of an aqueous FeCl 3 solution facilitates the generation of AOT reverse cylindrical micelles on the basis of the following two aspects: Firstly, in terms of pure AOT micelle systems, water is introduced into the reverse micelles in proportion to the amount of aqueous FeCl 3 solution present. This induces a swelling of the water pool inside the reverse micelles, which in turn increases the micelle aggregation number (the number of surfactant molecules required to form a micelle).…”

A Highly Efficient Palladium Nanocatalyst Anchored on a Magnetically Functionalized Polymer‐Nanotube Support

“…A significant enhancement of coercivity was observed relative to the value for bulk iron (Hc = 1 Oe) owing to the anisotropy of the magnetite embedded in the MCPPy NTs. [11] The photographs in Figure 3 demonstrate that the Pd/MCPPy NTs in aqueous solution can be harvested and separated by a magnetic field; this process takes about ten seconds.…”