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Periodically ordered nanohetero inorganic structures of nanoparticles, nanorods and layers in a matrix from self-assembled block copolymers

Published online by Cambridge University Press:  09 September 2014

Hiroaki Wakayama ,
Hirotaka Yonekura  and
Yasuaki Kawai
Hiroaki Wakayama*
Affiliation:
Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan,
Hirotaka Yonekura
Affiliation:
Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan,
Yasuaki Kawai
Affiliation:
Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan,
*
*Email: wakayama@mosk.tytlabs.co.jp
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Abstract

Periodically ordered nanohetero inorganic structures offer great promise due to their unique electric, ionic, magnetic, and photonic properties. Many studies have focused on the formation of periodically ordered nano-hetero inorganic structures through layer-by-layer adsorption, sputtering, and self-assembly methods. However, the construction of three-dimensional periodically ordered nanohetero inorganic structures with desired sizes and morphologies remains a great challenge. We present a simple method for producing three-dimensional periodically ordered inorganic nanoheterostructures with controlled shape and size by replicating self-assembled block copolymers (BCPs) containing precursors of metals and metal oxides. Precursors were dissolved with BCPs in a solvent. Upon evaporation of the solvent, each precursor was selectively introduced into a separate polymer block. Application of an external magnetic field (10 T) to the BCP-precursor composites resulted in a phase transition of from spheres to hexagonal cylinders. Subsequent pyrolytic removal of the BCPs produced periodically ordered nanoheterostructures that were structural replicates of the precursor–BCP composites. Self-assembled nano-hetero inorganic structures of nanoparticles, nanorods and layers in a matrix were produced. The morphology and domain size can be tailored by controlling the molecular weight and relative block length of block copolymers. The controlled size and morphology of the inorganic nanoheterostructures demonstrate the method’s utility for producing highly functional materials.

Keywords

self-assemblynanostructuremagnetic properties
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1706: Symposium TT – Mesoscale Self-Assembly of Nanoparticles—Manufacturing, Functionalization, Assembly and IntegrationMesoscale Self-Assembly of Nanoparticles—Manufacturing, Functionalization, Assembly and Integration , 2014 , mrss14-1706-tt07-04
Copyright
Copyright © Materials Research Society 2014 

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References

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