Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.389
Publication date: 7th February 2022
The study discusses the tailoring of branched structures with a star shape based on PbS semiconductors, by exposing the reaction mechanism and the controlling factors that template their morphology. For this purpose, we varied the primary Pb precursors, type of surfactants, Pb-to-surfactant molar ratio, as well as temperature and duration of the reaction. Experimental shreds of evidence designated a primary formation of truncated octahedral seeds with terminating {100} and {111} facets, followed by the selective fast growth of pods along the <100> directions toward the development of a star-like shape. A thorough study also exposed the surfactants' hidden role in branching the structures with short surfactants (e.g. acetate), while long-chain surfactants (e.g. oleate) stabilize the long pods and mitigate an aggregation process. This study conveys fundamental knowledge for the design of branched structures that could serve as active layers in catalysis, electrochemistry and light-harvesting applications
The authors acknowledge the financial support from the Israel Science Foundation (No. 2528/19), the Israel Science Foundation (No. 1045/17). This work was also supported by the European Commission via the Marie Sklodowska-Curie Action Phonsi (H2020-MSCA-ITN-642656).
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