Large scale exfoliation of inorganic layered compounds in aqueous surfactant solutions

Large scale exfoliation of inorganic layered compounds in aqueous surfactant solutions

| Ronan J Smith, Paul J King, Mustafa Lotya, Christian Wirtz, Umar Khan, Sukanta De, Arlene O'Neill, Georg S Duesberg, Jaime C Grunlan, Gregory Moriarty, Jun Chen, Jiazhao Wang, Andrew Minett, Valeria Nicolosi, Jonathan N Coleman
This article presents a method for the large-scale exfoliation of inorganic layered compounds in aqueous surfactant solutions, which can be applied to a wide range of materials such as MoS₂, BN, transition metal dichalcogenides (TMDs), and transition metal oxides. The method involves the use of surfactants to stabilize the exfoliated nanosheets and prevent re-aggregation. The exfoliation process is carried out in water, which is advantageous for large-scale applications compared to organic solvents. The resulting nanosheets are stable, can be processed into films and composites, and have potential applications in thermoelectric devices, batteries, and supercapacitors. The exfoliation method is robust, scalable, and can be performed under ambient conditions. The process involves sonication of the layered compounds in an aqueous surfactant solution, followed by centrifugation to remove un-exfoliated material. The resulting dispersion is stable, with the surfactant coating preventing re-aggregation. The exfoliated nanosheets are characterized by their high surface area and unique properties, making them suitable for various applications. The method was tested with MoS₂, and the resulting dispersion was found to be stable, with a high concentration of exfoliated nanosheets. The exfoliated MoS₂ nanosheets were found to be highly stable, with a zeta potential of -40 mV, indicating good stability in aqueous solution. Transmission electron microscopy (TEM) confirmed the presence of thin, well-exfoliated flakes, with sizes ranging from 2 to 9 layers. The exfoliated MoS₂ was used to create films, which were found to be semiconducting with an optical gap of ~1.6 eV. The method was also applied to other inorganic layered compounds, such as BN, WS₂, TaSe₂, MoTe₂, MoSe₂, and NbSe₂, and stable dispersions were obtained. These dispersions were used to create films, which were found to have useful properties for applications such as supercapacitors. The exfoliation method is general and can be applied to a wide range of layered compounds, offering a versatile and scalable approach for the production of inorganic layered materials. The method is not limited to MoS₂ and can be extended to other materials, providing a valuable tool for the production and characterization of new materials.This article presents a method for the large-scale exfoliation of inorganic layered compounds in aqueous surfactant solutions, which can be applied to a wide range of materials such as MoS₂, BN, transition metal dichalcogenides (TMDs), and transition metal oxides. The method involves the use of surfactants to stabilize the exfoliated nanosheets and prevent re-aggregation. The exfoliation process is carried out in water, which is advantageous for large-scale applications compared to organic solvents. The resulting nanosheets are stable, can be processed into films and composites, and have potential applications in thermoelectric devices, batteries, and supercapacitors. The exfoliation method is robust, scalable, and can be performed under ambient conditions. The process involves sonication of the layered compounds in an aqueous surfactant solution, followed by centrifugation to remove un-exfoliated material. The resulting dispersion is stable, with the surfactant coating preventing re-aggregation. The exfoliated nanosheets are characterized by their high surface area and unique properties, making them suitable for various applications. The method was tested with MoS₂, and the resulting dispersion was found to be stable, with a high concentration of exfoliated nanosheets. The exfoliated MoS₂ nanosheets were found to be highly stable, with a zeta potential of -40 mV, indicating good stability in aqueous solution. Transmission electron microscopy (TEM) confirmed the presence of thin, well-exfoliated flakes, with sizes ranging from 2 to 9 layers. The exfoliated MoS₂ was used to create films, which were found to be semiconducting with an optical gap of ~1.6 eV. The method was also applied to other inorganic layered compounds, such as BN, WS₂, TaSe₂, MoTe₂, MoSe₂, and NbSe₂, and stable dispersions were obtained. These dispersions were used to create films, which were found to have useful properties for applications such as supercapacitors. The exfoliation method is general and can be applied to a wide range of layered compounds, offering a versatile and scalable approach for the production of inorganic layered materials. The method is not limited to MoS₂ and can be extended to other materials, providing a valuable tool for the production and characterization of new materials.
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[slides and audio] Large%E2%80%90Scale Exfoliation of Inorganic Layered Compounds in Aqueous Surfactant Solutions