Solvent controlled 2D structures of bottom-up fabricated nanoparticle superlattices

E. Erik Beck; Agnes Weimer; Artur Feld; Vedran Vonk; Heshmat Noei; Dieter Lott; Arno Jeromin; Satishkumar Kulkarni; Diletta Giuntini; Alexander Plunkett; Berta Domènech; Gerold A. Schneider; Tobias Vossmeyer; Horst Weller; Thomas F. Keller; Andreas Stierle

doi:10.1039/D2NR03043H

Solvent controlled 2D structures of bottom-up fabricated nanoparticle superlattices†

E. Erik Beck,

*^a Agnes Weimer,^b Artur Feld,^b Vedran Vonk,

^a Heshmat Noei,

^a Dieter Lott,^c Arno Jeromin,^a Satishkumar Kulkarni,^a Diletta Giuntini,

^de Alexander Plunkett,^d Berta Domènech,^dh Gerold A. Schneider,^d Tobias Vossmeyer,

^b Horst Weller,

^bf Thomas F. Keller

^ag and Andreas Stierle

^bg

Author affiliations

* Corresponding authors

^a Centre for X-ray and Nano Science, Deutsches Elektronen-Synchrotron (DESY), Germany
E-mail: esko.erik.beck@desy.de

^b Institute of Physical Chemistry, Universität Hamburg, Germany

^c Helmholtz Zentrum Hereon, Germany

^d Institute of Advanced Ceramics, Hamburg University of Technology, Germany

^e Department of Mechanical Engineering, Eindhoven University of Technology, Netherlands

^f Fraunhofer Center for Applied Nanotechnology, Grindelallee 117, 20146 Hamburg, Germany

^g Physics Department, Universität Hamburg, Germany

^h ams-OSRAM International GmbH, ams OSRAM Group, Leibnizstr. 4, 93055 Regensburg, Germany

Abstract

We demonstrate that oleyl phosphate ligand-stabilized iron oxide nanocubes as building blocks can be assembled into 2D supercrystalline mono- and multilayers on flat YSZ substrates within a few minutes using a simple spin-coating process. As a bottom-up process, the growth takes place in a layer-by-layer mode and therefore by tuning the spin-coating parameters, the exact number of deposited monolayers can be controlled. Furthermore, ex situ scanning electron and atomic force microscopy as well as X-ray reflectivity measurements give evidence that the choice of solvent allows the control of the lattice type of the final supercrystalline monolayers. This observation can be assigned to the different Hansen solubilities of the solvents used for the nanoparticle dispersion because it determines the size and morphology of the ligand shell surrounding the nanoparticle core. Here, by using toluene and chloroform as solvents, it can be controlled whether the resulting monolayers are ordered in a square or hexagonal supercrystalline lattice.

Nanoscale

Solvent controlled 2D structures of bottom-up fabricated nanoparticle superlattices†

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Solvent controlled 2D structures of bottom-up fabricated nanoparticle superlattices

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