A facile route toward functionalized amphiphilic layered transition-metal dichalcogenide nanosheets through in situ polymerization of polystyrene–polyacrylamide copolymers is established. The attachment of copolymers greatly affects their dispersibility in different kinds of solvents. Surface-tension components, polarity, and coordination effects of the copolymer are found to be the main factors affecting the dispersibility.
Insight into In Situ Amphiphilic Functionalization of Few-Layered Transition Metal Dichalcogenide Nanosheets
In current work, a non-toxic mixture of 2-propanol (IPA)/water (7:3 by volume) was used for the liquid phase exfoliation (LPE) of bulk MoS2 powder. It exhibited similar exfoliation efficiency as conventional N-methyl-2-pyrrolidone, while its low boiling point further facilitated functionalization. Covalent functionalization of LTMDs has been relatively limited on account of LTMDs’ strong chemical stability within reactive organic and aqueous systems. Consequently, researchers have pursued highly reactive radical-based functionalization strategies to impart specific properties to LTMDs. Following suit, after LPE of MoS2, several polystyrene (PS)–polyacrylamide (PAM) grafted copolymers were synthesized simultaneously on exfoliated MoS2 nanosheets by in situ living free-radical polymerization