Mono- and Multilayer Silicene-Type Honeycomb Lattices by Oriented Attachment of PbSe Nanocrystals: Synthesis, Structural Characterization, and Analysis of the Disorder

Joep L. Peters, Thomas Altantzis, Ivan Lobato, Maryam Alimoradi Jazi, Carlo Van Overbeek, Sara Bals, Daniel Vanmaekelbergh, Sophia Buhbut Sinai

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Nanocrystal (NC) solids are commonly prepared from nonpolar organic NC suspensions. In many cases, the capping on the NC surface is preserved and forms a barrier between the NCs. More recently, superstructures with crystalline connections between the NCs, implying the removal of the capping, have been reported, too. Here, we present large-scale uniform superstructures of attached PbSe NCs with a silicene-type honeycomb geometry, resulting from solvent evaporation under nearly reversible conditions. We also prepared multilayered silicene honeycomb structures by using larger amounts of PbSe NCs. We show that the two-dimensional silicene superstructures can be seen as a crystallographic slice from a 3-D simple cubic structure. We describe the disorder in the silicene lattices in terms of the nanocrystals position and their atomic alignment. The silicene honeycomb sheets are large enough to be used in transistors and optoelectronic devices.
Original languageEnglish
Pages (from-to)4831-4837
Number of pages7
JournalChemistry of Materials
Volume30
Issue number14
DOIs
Publication statusPublished - 24 Jul 2018

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