Polyaniline coated magnetic carbon-nano tube composite material and preparation method thereof

Abstract

The invention belonging to the nanometer material field relates to composite material made of carbon nanometer tubes enwrapped by polyaniline and ferroferric oxide and the preparation method thereof. The invention ultrasonically disperses the carbon nanometer tubes in an aqueous solution containing ferric iron ions and ferrous iron ions and obtains carbon nanometer tubes / ferroferric oxide composite material after adding ammonia. After washing and magnetic separation, the carbon nanometer tubes / ferroferric oxide composite material disperses in a mixed liquor containing aniline, phosphoric acid and ammonium persulfate and the composite material of the invention is obtained after agitation. After water and alcohol washing and magnetic separation, finished products are obtained through drying or dispersing in absolute ethyl alcohol. The material which has the functions of electrical conductivity, magnetism, absorption and capability of absorbing and releasing material carrying negative charge in an aqueous solution can be applicable to the fields such as enzyme immobilization, bioactive substance separation, target-oriented medicine preparation, biosensor, environmental protection, etc. The invention which has simple preparation art, low cost and high raw material utilization factor is suitable for volume production.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, in particular to a polyaniline-wrapped magnetic carbon nanotube composite material and its preparation technology. Background technique [0002] Since carbon nanotubes were first reported by Iijima [Iijima, S., Nature 1991, 354, 56-58.] in Japan in 1991, the material has been characterized by its unique structure, excellent electrical conductivity, high mechanical strength, and chemical stability. It has received extensive attention in related fields at home and abroad, and has made great breakthroughs in many new fields such as nanoelectronic devices, super composite materials, hydrogen storage materials, and catalyst carriers, which has attracted international attention in physics, chemistry, and materials. great interest in the field. In the past 10 years, the research and development of carbon nanotubes at home and abroad have been extremely active, and major breakthroughs have b...

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Problems solved by technology

Some studies have dispersed carbon nanotubes in an aqueous solution containing ferric and ferrous ions, and prepared carbon nanotubes / nano ferric oxide composites after dripping ammonia water [Qu S., Wang J., Kong J.L. , Yang P.Y., Chen G., Talanta 2007, 71, 1096-1102.], but there are the following defects: the nano-ferric oxide particles on the carbon nanotubes are easy to fall off, and the nano-ferric oxide is easily oxidized and discolored in aqueous solution , because ferroferric oxide is an insulator, while introducing magnetism, the conductivity of the material is greatly reduced, etc.

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