Preparation method capable of achieving large-scale preparation of Fe3O4@Aucore@shell structured nanorods with controllable size and dispersion

Abstract

The invention discloses a preparation method capable of achieving large-scale preparation of super-paramagnetic Fe3O4@Au-core@shell structured nanorods with controllable size and dispersion, and belongs to the field of intersection of multiple subjects such as macromolecular living polymerization methods, functional polymer molecule design and inorganic crystal growth. The method comprises the following steps that (1), cellulose used for modifying hydroxide radical serves as a macromolecular initiator, and by means of a continuous polymerization ATRP technology and a linked chemical reaction,a series of brush-shaped triblock polymers cellulose-g-[P4VP-b-PAA-b-PS] and cellulose-g-[P4VP-b-PAA-b-PEG] are prepared separately, wherein the triblock polymers each comprise two template structureunits; (2), a solution-phase synthesis method serves as a basis, a certain quantity of the above-mentioned prepared brush-shaped triblock polymers serves as a monomolecular template, first section P4VP serves as a template phase, FeCl2.4H2O, FeCl3.6H2O and NH3.H2O serve as a precursor compound system, and then super-paramagnetic Fe3O4 nanorods are firstly prepared to serve as cores; and (3), similarly, a Fe3O4 nanorod system with the surface coated with a second template phase PAA serves as the monomolecular template, chloroauric acid serves as a precursor compound, tert-butylamine boron serves as a reducing agent, and then the gold nanorod shell structure is prepared.

Description

technical field [0001] The invention relates to a large-scale preparation of Fe with controllable size and dispersibility 3 o 4 The preparation method of nanorods with @Au core@shell structure belongs to polymer living polymerization method, functional polymer molecular design and Fe 3 o 4 Crystal, and Au crystal growth and other interdisciplinary fields. In particular, it relates to a method of using bottlebrush-like functional polymers as unimolecular templates, the unimolecular micellar templates contain two independent template phase units, and through in-situ crystal growth methods, the core material Fe 3 o 4 and the shell material Au are independently grown on their respective template phases to prepare a series of Fe with controllable size, aspect ratio and dispersibility. 3 o 4 @Au core@shell structured nanorods. Background technique [0002] Generally speaking, materials with a dimension of 1-100nm or more are called nanomaterials. Normally, a large number o...

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Problems solved by technology

At present, the main method used to prepare two different inorganic crystal hybrid core@shell nanostructures is the epitaxial crystal growth method, but this method has strict requirements on the matching of the lattice constants of the two crystals ( It is generally required that the interface lattice mismatch degree is less than 2%). Under this condition, it is difficult to synthesize superparamagnetic Fe with core@shell structure by existing methods. 3 o 4 @Au nanorod structure

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