A Shape-Induced Orientation Phase within 3D Nanocrystal Solids

Burian M, Karner C, Yarema M, Heiß W, Amenitsch H, Dellago C, Lechner RT (2018)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2018

Journal

Advanced Materials Wiley-VCH Verlag

Publisher: Wiley-VCH Verlag

Book Volume: 30

Article Number: 1802078

Journal Issue: 32

DOI: 10.1002/adma.201802078

Abstract

When nanocrystals self assemble into ordered superstructures they form functional solids that may inherit the electronical properties of the single nanocrystals. To what extent these properties are enhanced depends on the positional and orientational order of the nanocrystals within the superstructure. Here, the formation of micrometer-sized free-standing supercrystals of faceted 20 nm Bi nanocrystals is investigated. The self-assembly process, induced by nonsolvent into solvent diffusion, is probed in situ by synchrotron X-ray scattering. The diffusion-gradient is identified as the critical parameter for controlling the supercrystal-structure as well as the alignment of the supercrystals with respect to the substrate. Monte Carlo simulations confirm the positional order of the nanocrystals within these superstructures and reveal a unique orientation phase: the nanocrystal shape, determined by the atomic Bi crystal structure, induces a total of 6 global orientations based on facet-to-facet alignment. This parallel alignment of facets is a prerequisite for optimized electronic and optical properties within designed nanocrystal solids. © 2018 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Authors with CRIS profile

Wolfgang Heiß Professur für Werkstoffwissenschaften (lösungsprozessierte Halbleitermaterialien)

Involved external institutions

Montanuniversität Leoben AT Austria (AT) Medizinische Universität Wien AT Austria (AT) École Polytechnique Fédérale de Lausanne (EPFL) CH Switzerland (CH) Technische Universität Graz AT Austria (AT)

How to cite

APA:

Burian, M., Karner, C., Yarema, M., Heiß, W., Amenitsch, H., Dellago, C., & Lechner, R.T. (2018). A Shape-Induced Orientation Phase within 3D Nanocrystal Solids. Advanced Materials, 30(32). https://dx.doi.org/10.1002/adma.201802078

MLA:

Burian, Max, et al. "A Shape-Induced Orientation Phase within 3D Nanocrystal Solids." Advanced Materials 30.32 (2018).

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