Site‐Selective Oxidation of Monolayered Liquid‐Exfoliated WS2 by Shielding the Basal Plane through Adsorption of a Facial Amphiphile

In recent years, various functionalization strategies for transition‐metal dichalcogenides have been explored to tailor the properties of materials and to provide anchor points for the fabrication of hybrid structures. Herein, new insights into the role of the surfactant in functionalization reactio...

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Published inAngewandte Chemie International Edition Vol. 59; no. 33; pp. 13785 - 13792
Main Authors Grieger, Sebastian, Szydłowska, Beata M., Rao, Vaishnavi J., Steinmann, Eva, Dodds, Marcus, Gholamvand, Zahra, Duesberg, Georg S., Zaumseil, Jana, Backes, Claudia
Format Journal Article
LanguageEnglish
Published Germany Wiley Subscription Services, Inc 10.08.2020
John Wiley and Sons Inc
EditionInternational ed. in English
Subjects
Basal plane
Chloroauric acid
Fabrication
functionalization
Hybrid structures
layered compounds
Material properties
Nanoparticles
nanostructures
Oxidation
Shielding
Surfactants
transition-metal dichalcogenides
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Summary:In recent years, various functionalization strategies for transition‐metal dichalcogenides have been explored to tailor the properties of materials and to provide anchor points for the fabrication of hybrid structures. Herein, new insights into the role of the surfactant in functionalization reactions are described. Using the spontaneous reaction of WS2 with chloroauric acid as a model reaction, the regioselective formation of gold nanoparticles on WS2 is shown to be heavily dependent on the surfactant employed. A simple model is developed to explain the role of the chosen surfactant in this heterogeneous functionalization reaction. The surfactant coverage is identified as the crucial element that governs the dominant reaction pathway and therefore can severely alter the reaction outcome. This study shows the general importance of the surfactant choice and how detrimental or beneficial a certain surfactant can be to the desired functionalization. The right surfactant: The extent to which the surfactant coverage of two‐dimensional materials can influence functionalization reactions is elaborated. In a case study of the spontaneous reaction of chloroauric acid with WS2, preferential adsorption of certain surfactants can be exploited to exert control on regioselective functionalization.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202005730