Nanoscale structure of self-assembling hybrid materials of inorganic and electronically active organic phases

Marina Sofos, David A. Stone, Dipak K. Goswami, John S. Okasinski, Hua Jin, Michael J. Bedzyk, Samuel I Stupp

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Hybrid materials with nanoscale structure that incorporates inorganic and organic phases with electronic properties offer potential in an extensive functional space that includes photovoltaics, light emission, and sensing. This work describes the nanoscale structure of model hybrid materials with phases of silica and electronically active bola-amphiphile assemblies containing either oligo-phenylene vinylene) or oligo-(thiophene) segments. The hybrid materials studied here were synthesized by evaporation-induced self-assembly and characterized by X-ray scattering techniques. Grazing-incidence X-ray scattering studies of these materials revealed the formation of two-dimensional hexagonally packed cylindrical micelles of the organic molecules with diameters between 3.1 and 3.6 nm and cylindrical axes parallel to the surface. During the self-assembly process at low pH, the cylindrical aggregates of conjugated molecules become surrounded by silica giving rise to a hybrid structure with long-range order. Specular X-ray reflectivity confirmed the long-range periodicity of the hybrid films within a specific range of molar ratios of tetraethyl orthosilicate to cationic amphiphile. We did not observe any long-range ordering in fully organic analogues unless quaternary ammonium groups were replaced by tertiary amines. These observations suggest that charge screening in these biscationic conjugated molecules by the mineral phase is a key factor in the evolution of long range order in the self-assembling hybrids.

Original languageEnglish
Pages (from-to)2881-2887
Number of pages7
JournalJournal of Physical Chemistry C
Volume112
Issue number8
DOIs
Publication statusPublished - Feb 28 2008

Fingerprint

Hybrid materials
assembling
Amphiphiles
X ray scattering
Silicon Dioxide
Self assembly
Molecules
self assembly
Silica
silicon dioxide
tetraethyl orthosilicate
molecules
Thiophenes
x rays
hybrid structures
Light emission
Micelles
Thiophene
thiophenes
scattering

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Nanoscale structure of self-assembling hybrid materials of inorganic and electronically active organic phases. / Sofos, Marina; Stone, David A.; Goswami, Dipak K.; Okasinski, John S.; Jin, Hua; Bedzyk, Michael J.; Stupp, Samuel I.

In: Journal of Physical Chemistry C, Vol. 112, No. 8, 28.02.2008, p. 2881-2887.

Research output: Contribution to journalArticle

Sofos, Marina ; Stone, David A. ; Goswami, Dipak K. ; Okasinski, John S. ; Jin, Hua ; Bedzyk, Michael J. ; Stupp, Samuel I. / Nanoscale structure of self-assembling hybrid materials of inorganic and electronically active organic phases. In: Journal of Physical Chemistry C. 2008 ; Vol. 112, No. 8. pp. 2881-2887.
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