TY - JOUR

T1 - Low Temperature Reaction of Molecular Zinc Oxide Precursors in Ionic Liquids Leading to Ionogel Nanoparticles with Shape Anisotropy

T2 - Low Temperature Reaction of Molecular Zinc Oxide Precursors in Ionic Liquids Leading to Ionogel Nanoparticles with Shape Anisotropy

AU - Voggenreiter, Markus

AU - Vöpel, Pascal

AU - Smarsly, Bernd

AU - Polarz, Sebastian

N1 - Funding Information: We thank the Deutsche Forschungsgemeinschaft (DFG) for funding of the project within the framework of the SPP 1708 (Materials Synthesis Near Room Temperature). We also thank the SFB-1214 (Anisotropic Particles as Building Blocks) for the possibility to use the Particle Analysis Centre for nanoparticle characterization. Publisher Copyright: © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2017/1

Y1 - 2017/1

N2 - The majority of particle synthesis methods are based on nucleation and growth processes in solvents. Whereas the role of capping agents has been investigated extensively regarding control particle size and shape, the unique role of the solvent is understood to a much lesser extent. Compared to other polar solvents, e.g. water, ionic liquids (ILs) are unique because their properties can be fine-tuned precisely by appropriate choice and modification of cation and anion. This makes ILs also interesting for particle synthesis. We present the generation of zinc oxide (ZnO) in imidazolium ILs starting from molecular precursors. A hydrolytic, sol-gel based synthesis route is suitable to achieve nanocrystalline ZnO. We find by in-situ synchrotron wide angle X-ray diffraction that in ILs an unusual ZnO phase with α-boron nitride structure acts as an intermediate prior to crystallization of the thermodynamically stable Wurtzite. This special mechanism leads to organic-inorganic hybrid IL/ZnO nanoparticles with plate-like morphology. Because of the large content of IL embedded in the ZnO matrix the novel particles gain ionogel properties, e.g. ion conductivity probed by impedance spectroscopy.

AB - The majority of particle synthesis methods are based on nucleation and growth processes in solvents. Whereas the role of capping agents has been investigated extensively regarding control particle size and shape, the unique role of the solvent is understood to a much lesser extent. Compared to other polar solvents, e.g. water, ionic liquids (ILs) are unique because their properties can be fine-tuned precisely by appropriate choice and modification of cation and anion. This makes ILs also interesting for particle synthesis. We present the generation of zinc oxide (ZnO) in imidazolium ILs starting from molecular precursors. A hydrolytic, sol-gel based synthesis route is suitable to achieve nanocrystalline ZnO. We find by in-situ synchrotron wide angle X-ray diffraction that in ILs an unusual ZnO phase with α-boron nitride structure acts as an intermediate prior to crystallization of the thermodynamically stable Wurtzite. This special mechanism leads to organic-inorganic hybrid IL/ZnO nanoparticles with plate-like morphology. Because of the large content of IL embedded in the ZnO matrix the novel particles gain ionogel properties, e.g. ion conductivity probed by impedance spectroscopy.

KW - Semiconductor oxides; Nanocrystal shape; Ionic liquids; Ionogels; Mesocrystals

UR - http://www.scopus.com/inward/record.url?scp=85002952413&partnerID=8YFLogxK

U2 - 10.1002/zaac.201600341

DO - 10.1002/zaac.201600341

M3 - Article

VL - 643

SP - 93

EP - 100

JO - Zeitschrift fur Anorganische und Allgemeine Chemie

JF - Zeitschrift fur Anorganische und Allgemeine Chemie

SN - 0044-2313

IS - 1

ER -