Ultrasonic‐Ball Milling: A Novel Strategy to Prepare Large‐Size Ultrathin 2D Materials

Abstract

Large‐size ultrathin 2D materials, with extensive applications in optics, medicine, biology, and semiconductor fields, can be prepared through an existing common physical and chemical process. However, the current exfoliation technologies still need to be improved upon with urgency. Herein, a novel and simple “ultrasonic‐ball milling” strategy is reported to effectively obtain high quality and large size ultrathin 2D materials with complete lattice structure through the introduction of moderate sapphire (Al2O3) abrasives in a liquid phase system. Ultimately numerous high‐quality ultrathin h‐BN, graphene, MoS2, WS2, and BCN nanosheets are obtained with large sizes ranging from 1–20 µm, small thickness of ≈1–3 nm and a high yield of over 20%. Utilizing shear and friction force synergistically, this strategy provides a new method and alternative for preparing and optimizing large size ultrathin 2D materials.

Controlled Production of MoS2 Full‐Scale Nanosheets and Their Strong Size Effects

“…[ 16,28 ] Similar to the E 1 2g mode, the A 1g mode was very sensitive to the sizes and thicknesses of the NSs, as reported elsewhere. [ 28,32 ] However, the shifting of the peak of A 1g mode was more complicated, i.e., blue‐shifting by 1.8 cm −1 and red‐shifting by 2.4 cm −1 during the size‐reduction from 161 to 67 nm and from 67 to 10 nm, respectively. Note that the lateral sizes of 161, 67, and 10 nm corresponded to the thicknesses of 18.3 (multilayer), 5.1 (few‐layer), and 1.0 nm (1–2 layers), respectively.…”

Mechanochemical Synthesis of Pt/Nb2CTx MXene Composites for Enhanced Electrocatalytic Hydrogen Evolution

“…In addition, the preparation of such supported noble metal catalysts generally requires complicated procedures, complicated experimental conditions (such as high annealing temperature and pressure) and the use of a large number of organic solvents or capping agents, making the processing inefficient in time and costs, and even bringing environmental problems [ 17 , 18 ]. Moreover, it is a challenge to apply synthetic routes from a laboratory scenario to large-scale industrial production, since the scale-up effect will make it difficult to delicately control the size and dispersity of noble metal nanostructures on supports [ 19 ]. The problems mentioned above have appreciably limited the large-scale application of such catalysts in practical scenarios.…”

Green Constructing an Intelligent Temperature-Regulating Fabric with Multiple Heat-Transfer Capabilities

“…Multilayer BN powder was rstly tip-type sonicated in SDS solution (1mol/L) and dispersed for 3 h (Shi et al, 2020). Then 5 mol/L sodium hydroxide was added to the resulting BN dispersion and transferred to a three-necked ask for hydroxylation (Lu et al, 2021).…”