Transition metal disulfides (TMDs) are a class of two-dimensional materials with extraordinary properties and great potential. As the most representative TMDs, molybdenum disulfide (MoS2) and tungsten disulfide (WS2) have been widely studied. Quantum chip preparation is divided into bottom-up and top-down two ways. Bottom-up preparation often requires harsh reaction conditions and complicated post-processing, top-down preparation of the quantum yield obtained from the normal yield In addition, both methods of preparation face the challenge of how to avoid defects and obtain intrinsic quantum sheets.
Zhang Yong, director of the National Nanoscience Center, co-authored the research team of Liu Xinfeng and Gao Peng of Peking University, and invented a new technology that can produce defect-free intrinsic MoS2 and WS2 quantum chips on a large scale. Assisted ball milling, ultrasonic assisted solvent stripping and other measures to produce defect-free intrinsic MoS2 and WS2 quantum sheets at very high yields of 25.5 wt% and 20.1 wt%, respectively.After collecting the quantum dot powder, by means of redispersion The quantum dots can be dispersed in high concentration (20mg / mL) in a variety of solvents.When the 0.1wt% quantum dot is loaded on the PMMA film, the optical properties of the quantum dots can be greatly improved, which is higher than that of the films loaded with nanosheets An order of magnitude.The preparation technology has very good universality, provides a train of thought for large-scale production of two-dimensional quantum sheets.
Relevant research results have been published in Nano Letters on the topic of High-yield production of MoS2 and WS2 quantum sheets from their bulk materials, and the preparation method has been applied for a Chinese invention patent. The research was supported by the National Natural Science Foundation of China, the Chinese Academy of Sciences's Hundred Talents Program, Start-up funds and other funding.
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MoS2 and WS2 quantum chip preparation mechanism diagram