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Site‐Selective Oxidation of Monolayered Liquid‐Exfoliated WS 2 by Shielding the Basal Plane through Adsorption of a Facial Amphiphile
Author(s) -
Grieger Sebastian,
Szydłowska Beata M.,
Rao Vaishnavi J.,
Steinmann Eva,
Dodds Marcus,
Gholamvand Zahra,
Duesberg Georg S.,
Zaumseil Jana,
Backes Claudia
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202005730
Subject(s) - surface modification , pulmonary surfactant , chloroauric acid , amphiphile , chemistry , chemical engineering , adsorption , nanotechnology , regioselectivity , transition metal , materials science , nanoparticle , combinatorial chemistry , organic chemistry , colloidal gold , copolymer , catalysis , biochemistry , engineering , polymer
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 WS 2 with chloroauric acid as a model reaction, the regioselective formation of gold nanoparticles on WS 2 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.