Original Article

Subject Category: Inorganic, composite and hybrid materials

Citation: NPG Asia Materials (2012) 4, e22; doi:10.1038/am.2012.40
Published online 20 July 2012

Strain-driven self-rolling of hybrid organic–inorganic microrolls: interfaces with self-assembled particles

Masahide Takahashi1, Cristiana Figus2, Luca Malfatti2, Yomei Tokuda3, Kazuyuki Yamamoto3, Toshinobu Yoko3, Takuya Kitanaga1, Yasuaki Tokudome1 and Plinio Innocenzi2

  1. 1Department of Materials Science, Osaka Prefecture University, Sakai, Osaka, Japan
  2. 2Laboratorio di Scienza dei Materiali e Nanotecnologie, CNSB, CR-INSTM, Università di Sassari, Alghero, Italy
  3. 3Institute for Chemical Research, Kyoto University, Uji, Kyoto, Japan

Correspondence: Professor M Takahashi, Department of Materials Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan. E-mail: masa@photomater.com; Professor Y Tokuda, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611–0011, Japan. E-mail: tokuda@noncry.kuicr.kyoto-u.ac.jp; Professor P Innocenzi, Laboratorio di Scienza dei Materiali e Nanotecnologie, CNSB, CR-INSTM, Università di Sassari, Palazzo Pou Salit, Piazza Duomo 6, Alghero (SS) 07041, Italy. E-mail: plinio@uniss.it

Received 23 February 2012; Revised 6 June 2012; Accepted 6 June 2012

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Abstract

Strain driven micro and nanoroll fabrication is generally restricted to multilayer and multiprocessing systems, limiting the ability to exploit self-organization at different length scales. We have designed a hybrid organic–inorganic single-layered film with a surface that responds selectively to external stimuli, resulting in mechanical strain and self-rolling in one-step fabrication. The scrolling is initiated by water and any aqueous solution of molecules or colloidal particles. During scrolling, the different species in solution remain entrapped in the rolls; the constrained environment at the interface of the roll walls pushes the particles to organize into ordered structures. We used this rolling process to create self-assembled hybrid films with well-ordered layers of gold nanoparticles and opals of polystyrene nanospheres. These films also respond selectively to solvents, allowing the easy release of molecules/particles entrapped at the interface.

Keywords:

self-assembly; microrolls; nanoparticle; smart materials; sol–gel; hybrid organic–inorganic materials

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