journal article·2017-09Open access

3D Orientational Control in Self‐Assembled Thin Films with Sub‐5 nm Features by Light

Koen Nickmans, Gerardus M. Bögels, Carlos Sánchez‐Somolinos, Jeffrey N. Murphy, Philippe Leclère, Ilja K. Voets, Albertus P. H. J. Schenning

Small· Volume 13· Issue 33

Abstract

While self‐assembled molecular building blocks could lead to many next‐generation functional organic nanomaterials, control over the thin‐film morphologies to yield monolithic sub‐5 nm patterns with 3D orientational control at macroscopic length scales remains a grand challenge. A series of photoresponsive hybrid oligo(dimethylsiloxane) liquid crystals that form periodic cylindrical nanostructures with periodicities between 3.8 and 5.1 nm is studied. The liquid crystals can be aligned in‐plane by exposure to actinic linearly polarized light and out‐of‐plane by exposure to actinic unpolarized light. The photoalignment is most efficient when performed just under the clearing point of the liquid crystal, at which the cylindrical nanostructures are reoriented within minutes. These results allow the generation of highly ordered sub‐5 nm patterns in thin films at macroscopic length scales, with control over the orientation in a noncontact fashion.
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Research context

OpenAlex topics: Liquid Crystal Research Advancements · Block Copolymer Self-Assembly · Advanced Materials and Mechanics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Laboratory of Functional Organic Materials and Devices Department of Chemical Engineering and Chemistry Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands

Departamento de Física de la Materia Condensada Instituto de Ciencia de Materiales de Aragón (ICMA) CSIC‐Universidad de Zaragoza 50009 Zaragoza Spain

Laboratory for Chemistry of Novel Materials Center for Innovation and Research in Materials and Polymers (CIRMAP) University of Mons (UMONS) Place du Parc 20 B 7000 Mons Belgium

Institute for Complex Molecular Systems Eindhoven University of Technology 5600 MB Eindhoven The Netherlands

Laboratory of Macromolecular and Organic Chemistry Department of Chemical Engineering and Chemistry Eindhoven University of Technology 5600 MB Eindhoven The Netherlands

Laboratory of Physical Chemistry Department of Chemical Engineering and Chemistry Eindhoven University of Technology 5600 MB Eindhoven The Netherlands

Funding

Ministerie van Economische Zaken · Nederlandse Organisatie voor Wetenschappelijk Onderzoek

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