Presentation of the results
Two-dimensional transition metal chalcogenide (TMDs) semiconductor materials are widely used in interfacial reactions and electronic devices due to their tunable band gap and efficient carrier transport. However, the lack of fully exposed active sites in bulk samples or stacked nanosheets limits their performance.
Based on this, Ren Yuan, associate researcher and Professor Tao Li (co-corresponding author) of Southeast University, reported a general method for the construction of ordered mesoporous TMDs/metal oxides (OM-TMDs/MOs) semiconductor heterostructures by one-step hot vulcanization (selenization/tellurination) of amphiphilic block copolymers/polyoxometalate clusters (BCPs/POMs) nanocomposites with ordered mesostructures, including WS2/WO3, WSe2/WO3, WTe2/WO3, MoS2/ MoO3 and V3S4/V2O3. OM-TMDs/MOs have a highly ordered mesoporous structure with high specific surface area, large pore size, and abundant active edge sites in a heterostructural framework. The chemoresistive gas sensor based on OM-WS2/WO3 exhibits excellent NO2 sensing performance at room temperature, with high sensitivity and ultra-high selectivity (SNO2/Sgas>20) and fast response speed (6 s). Theoretical studies have shown that the strong adsorption capacity of the WS2/WO3 heterostructure and the WS2 edge site to NO2 molecules, as well as the high charge transfer between them, contribute to the high selectivity and sensitivity of the sensor. This versatile approach provides a new strategy for the synthesis of ordered mesoporous TMDs-based nanomaterials, showing great potential in various applications such as electronic devices, catalysis, energy storage, and conversion. The results were published in Small Structures (IF=13.9), and the first author is Zhenliang Li, a 2022 master from the School of Materials Science and Engineering, Southeast University.
Illustrated reading
Figure 1. (a) Schematic diagram of the synthesis of ordered mesoporous TMDs/MOs heterostructures by co-assembly of BCPs and POMs clusters combined with TAC process, and (b) TAC process diagram.
图 2.有序介孔WS2/WO3的结构表征。 (a-c)OM-WS2/WO3-500、(d-f)OM-WS2/WO3-600、(g-i)OM-WS2/WO3-700。
Figure 3. Structural characterization of ordered mesoporous WS2/WO3.
Figure 4. Gas sensitivity of OM-WS2/WO3 at room temperature.
Figure 5. Study of the mechanism of gas sensitivity.
Figure 6. The universality of the heterostructure of OM-TMDs/MOs is synthesized through the co-assembly of BCPs and POMs.
This project was supported by the National Natural Science Foundation of China (Innovation Group, Major Cultivation, and General), the National Key R&D Program, the Key R&D Program of Jiangsu Province, the Fundamental Research Funds for the Central Universities, and the "Virtuous Young Scholars" Support Program of Southeast University.
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Small Struct. 2024, 2400376.
https://doi.org/10.1002/sstr.202400376 Source: Frontiers of Polymer Science