DOI: https://doi.org/10.29363/nanoge.incnc.2021.008
Publication date: 8th June 2021
Thickness and anisotropy of nanoscale materials has been shown to strongly influence photophysical properties. For example, reducing the thickness or number of crystalline layers improves photocurrent collection efficiency of many semiconductors. While different exfoliation strategies for 2D materials have been proposed, many can cause damage or chemical modifications, and control over size and aggregation can be problematic. In this talk, templating the synthesis of semiconductors using colloidal particles that are anisotropic in both shape and surface charge is presented as a means to achieve 1D and 2D nanomaterial hybrids. Initial studies on shape-templating the growth of gold nanoparticles on layered silicate clays [1] led to the colloidal synthesis of ultrathin layers of semiconducting materials such as MoS2[2], In2S3, [3] and ZnIn2S4 [4] in the organically-modified interlayer space. In the case of Aurivillius-type perovskite Bi2MoO6, self-assembly of template particles with dianionic precursors results in micron-scale hybrids with a switched crystalline growth direction, providing optimal surface facets for molecular adsorption [5]. These nanohybrids show promising enhancements in catalytic and photophysical properties, and current directions in ‘facet engineering’ and colloidal synthesis of 1D semiconductor wires in tubular templates continue to keep us on our toes.
Many thanks to the members of my group who did most, if not all, of the lab work.
This research was funded by the DAAD from the funds of
German Federal Ministry of Education and Research (BMBF),
under the MOPGA-GRI program (57429511). E.H.H. is
supported by the Cluster of Excellence “Advanced Imaging of
Matter” of the Deutsche Forschungsgemeinschaft (DFG)
EXC 2056project ID 390715994. We thank Stefan Werner, Robert Schön, Hauke Heller, and the Weller group at the Institute for Physical Chemistry at Uni Hamburg for
providing access to equipment.
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