Hybrid materials can outperform graphene in several applications


Hybrid materials can outperform graphene in several applications

A structure comprising a monolayer of molybdenum disulfide on an azobenzene substrate could be used to construct a highly compactable, malleable, two-dimensional, light-fed transistor. Credit: atomistic representations of a monolayer of molybdenum disulfide with a molecule of azobenzene in its trans and cis isomers / Physical examination B

Materials that are hybrid constructions (combining organic and inorganic precursors) and almost two-dimensional structures (with malleable and highly compactable molecular structures) are multiplying, especially in the manufacture of smaller and smaller optoelectronic devices.

An article published in Physical examination B describes a study conducted by Diana Meneses Gustin and Luís Cabral, which theoretically explain the unique optical and transport properties resulting from the interaction between an inorganic substance MoS containing molybdenum disulfide2and an azobenzene substrate, organic substance C12HtenNOT2.

Illumination allows the azobenzene molecule to switch between isomerization and transition from a stable spatial configuration to a metastable cis form, producing effects on the electron cloud of the molybdenum disulfide monolayer. These effects, which are reversible, have already been studied experimentally by Emanuela Margapoti in the framework of postdoctoral research conducted at UFSCar and supported by FAPESP.

Gustin and Cabral have developed a model to emulate the process theoretically. "They performed ab initio simulations [computational simulations using only established science] and calculations based on the functional theory of density [a quantum mechanical method used to investigate the dynamics of many-body systems]. They also modeled the transport properties of the monolayer of molybdenum disulfide when it is disturbed by variations in the azobenzene substrate, "said researcher Lopez Richard.

Although the published document does not address technology applications, the deployment of the effect to build a two-dimensional transistor activated by light is on the horizon of the researchers.

"The almost two-dimensional structure makes molybdenum disulfide as attractive as graphene in terms of space reduction and malleability, but it has virtues that make it potentially even better. emits light in the wavelength range from the infrared to the visible region, "Richard said.

The hybrid molybdenum-disulfide-azobenzene structure is considered a very promising material, but it will require a lot of research and development to be able to be deployed effectively in useful devices.

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More information:
D. Meneses-Gustin et al, Photomodulation of transport in monolayer dichalcogenides, Physical examination B (2018). DOI: 10.1103 / PhysRevB.98.241403

Journal reference:
Physical examination B

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