Single‐Step Exfoliation and Covalent Functionalization of MoS₂ Nanosheets by an Organosulfur Reaction

Abstract

A simple approach to exfoliate and functionalize MoS2 in a single-step is described, which combines the dispersion of MoS2 in polybutadiene solution and ultrasonication processes. The great advantage of this process is that a colloidal stability of MoS2 in nonpolar solvent is achieved by chemically bonding polybutadiene on the perimeter edge sites of MoS2 sheets. In addition, elastomeric nanocomposite has been prepared with singular mechanical properties using functionalized MoS2 as nanofiller in a polybutadiene matrix with a subsequent vulcanization reaction.

Pyrolytically Modified Polyacrylonitrile‐Covalently Grafted MoS2 Nanosheets for a Nonvolatile Rewritable Memory Device

“…Like graphene and carbon nanotubes, the MoS 2 nanosheets are insoluble in any organic solvents, which makes them more difficulty to be fabricated into the thin film devices. To solve practical solution‐processability problems of the MoS 2 nanosheets, it would be an ideal and feasible way to design and synthesize MoS 2 ‐based solution‐processed organic/polymeric materials . However, synthesis of highly soluble MoS 2 nanosheets is still a challenge at the moment.…”

Molecular Functionalization of Two‐Dimensional MoS2 Nanosheets

“…The S atoms of MoS 2 were proven also to be reaction centers for the covalent grafting of organic compounds and dopants. In this frame, NMP‐assisted exfoliated 2H nanosheets soaked into polybutadiene solutions undergo a spontaneous thiol‐ene click reaction at the exposed S atoms, forming robust C−S bonds between the nanosheets and the polybutadiene . In addition, Knirsch and co‐workers adopted the chemistry of diazonium salts for the covalent grafting of methoxyphenyl diazonium salts onto chemically exfoliated 1T‐MoS 2 nanoflakes .…”

Surfactant‐Free Polar‐to‐Nonpolar Phase Transfer of Exfoliated MoS2 Two‐Dimensional Colloids

“…), taking advantage of the liquid‐phase dispersion. Functionalization can be achieved through covalent bonds or supramolecular assembly (ligand or metal coordination, physisorption) and some substantial work has already been performed in that regard, but almost exclusively limited to polar phases . Polar solvents are actually strongly preferred as LPE media: from the cohesive forces existing within these solvents at the microscopic scale (dipole–dipole attraction, hydrogen bonding, van der Waals forces) derive high surface tensions that are suitable for the layer separation, and the heteroatoms they bear (mainly N and O) confer them coordination sites that favor the colloidal dispersion of the nanosheets .…”