Covalent Cross‐Linking of 2H‐MoS₂ Nanosheets

Abstract

The combination of 2D materials opens a wide range of possibilities to create new‐generation structures with multiple applications. Covalently cross‐linked approaches are a ground‐breaking strategy for the formation of homo or heterostructures made by design. However, the covalent assembly of transition metal dichalcogenides flakes is relatively underexplored. Here, a simple covalent cross‐linking method to build 2H‐MoS2–MoS2 homostructures is described, using commercially available bismaleimides. These assemblies are mainly connected vertically, basal plane to basal plane, creating specific molecular sized spaces between MoS2 sheets. Therefore, this straightforward approach gives access to the controlled connection of sulfide‐based 2D materials.

Characterization of emerging 2D materials after chemical functionalization

“…, franckeite and few-layer FePS 3 ) 97,121 and also allowed the construction of 2D homo and heterostructures. 122,123 The mild conditions of this type of chemistry make it useful for obtaining MoS 2 –DNA bioconjugates, 124 or to tailor the electronic properties of field-effect transistors by direct on-device chemistry. 125…”

Rational Design of Stimuli‐Responsive Inorganic 2D Materials via Molecular Engineering: Toward Molecule‐Programmable Nanoelectronics

“…In this case, the soft nucleophilicity of S atoms allows the click integration of the molecular components through a Michael addition under very mild conditions. [281] This method has been particularly appealing for the Pérez's group, since further click chemistry approaches have been explored, for example, for either the covalent cross-linking of different flakes of 2H-MoS 2 through bismaleimide reagent, [290] the linkage of graphene to reach 2D/2D heterostructures, [291] or the formation of succinimide polymer adlayers covalently connected to 2H-MoS 2 by adding a basic reagent (rather than the molecular monolayer of maleimide clicked in absence of base). [292] Lastly, a fashionable way to overcome the inherent inner reactivity of 2H-TMD-mainly attributed to its neutral charge state that difficult electron transfer-is by employing the so-called phase transition engineering approach.…”

Clicking beyond suspensions: understanding thiol–ene chemistry on solid-supported MoS2

“…With this protocol, it is possible to obtain a highly efficient covalent attachment under very mild conditions, without transformation of the 2H-MoS 2 phase to the more reactive 1T-MoS 2 phase. 17,18 The use of these molecules for the functionalization of the 2H-MoS 2 phase has been proved useful with other transition metal dichalcogenides, 16 to decorate naturally occurring van der Waals heterostructures, 19 interconnect flakes, 20 and more recently for the formation of a graphene-MoS 2 covalent heterostructure where the electronic properties are dominated by the molecular interface. 21 Palma and co-workers have shown that the reaction is useful to obtain MoS 2 -DNA bioconjugates.…”