CO2 and 2-Dimensional Nanomaterials with Green Chemistry

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CO2 and 2-Dimensional Nanomaterials with Green Chemistry ( co2-and-2-dimensional-nanomaterials-with-green-chemistry )

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(a) (b) (c) Figure 10. a) HRTEM image of the as-prepared h-MoO3/1T-MoS2 heterostructure. b,c) Filtered images and corresponding fast Fourier transfer (FFT) of 1T- MoS2 and h-MoO3, respectively. Reprinted from reference [62]. Copyright 2017, Elsevier Ltd. Figure 11. a) TEM of the as-prepared TiO2/WO3H2O heterostructures. b) Schematic diagram of charge transfer in the TiO2/WO3H2O heterostructures under simulated solar light. Reprinted from reference [63]. Copyright 2017, Elsevier Ltd. h-BN and graphene domains (i.e., the C phase), which formed the in- plane 2D heterostructure. In addition, lateral heterostructures of MoS2/ WS2 could be obtained via CVD methods. Even so, the preparation of lateral heterostructures consisting of 2D materials such as TMDs is still a considerable challenge and has rarely been reported to date.[55] What is more, desirable heterostructures with clean and sharp interfaces, con- trolled stacking orientation, and massive production all remain chal- lenging. Supercritical carbon dioxide, with low viscosity, high diffusivity, and zero surface tension properties, which can endow the rapid mass transfer and facilitate layered structure assembly without significant cur- vature. And it has been expected that the usage of SC CO2 is capable of achieving assembled 2D heteromaterials with defect-free and atomically clean interfaces. 2.4.1. SC CO2-Assisted Construction of Vertical Heterostructures On the basis of the CO2-assisted exfoliation and phase transition of layered materials, Zhu et al.[62] have successfully prepared the h- MoO3/1T-MoS2 heterostructures (Figure 10). In this work, the strong acid environment caused by the dissolved CO2 molecules and the formed H2SO4 plays a key role in the built of special heterostruc- tures, which can enable the dissolution of MoO3 nanosheets. The Energy Environ. Mater. 2018, 1, 46–60 53 © 2018 Zhengzhou University

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