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Figure 15. a) Schematic illustration of 2D lateral building blocks of WS2-WO3H2O and 1T-2H MoS2 and the corresponding quaternary heterostructures. b) STEM imaging of the 2H and 3R stacking vertical WS2/MoS2 heterostructures in the quaternary heterostructures of WS2-WO3H2O/1T-2H MoS2. Reprinted from reference [67]. Copyright 2017, Wiley-VCH. achieved. Based on this work, Ren et al.[65] synthesized the oxide vacan- cies doped 2D lateral heterostructures of WS2/WO3H2O (Figure 13). 2.4.3. SC CO2-Assisted Construction of Complex Heterostructures Multidimensional heterostructures combined of vertical and lateral heterostructures can create new heterostructures with exciting proper- ties.[5] 2D heterostructures with precise control of the lateral and verti- cal integration are exciting for novel electronic and photovoltaic applications. To achieve this goal, high-quality heterostructures with desirable compositions and sequences are required. Cui et al.[66] designed and fabricated a novel triphasic heterostructures of 2H-/1T0- MoS2/graphene that the lateral 2H-/1T0-MoS2 heterojunctions were vertically stacked on the graphene layers (Figure 14). Theoretical analyses indicated the synergetic in-plane and interlayer couplings of the triphasic heterostructures with beneficial band alignment and high electronic conductivity could effectively extend the transmission of pho- ton-generated carriers, thus resulting in improved photoresponse. To date, numerous works are devoted to the exploration of 2D multinary TMDs heterostructures, which exhibit some unique proper- ties compared to 2D binary TMDs counterparts. However, controllably and selectively constructing a novel functional heterostructures with desirable compositions and sequences is challenging. Recently, Ren et al.[67] constructed the multiple heterostructures of WS2-WO3H2O/ 1T-2H MoS2 with preferred stacking assembly of 2H-WS2/2H-MoS2 from lateral WS2-WO3H2O and 1T-2H MoS2 heterostructures (Fig- ure 15). A predominant quaternary heterostructures could be obtained benefiting from the built unique pickering emulsion microenvironment in the SC CO2 system, where the hydrophilic or hydrophobic structure (f) (c) (d) (e) (a) (b) Figure 16. HRTEM images and the corresponding FFT patterns of a) the ultrasonicated sample and b) SC CO2-treated sample. Magnified images of c) the ultrasonicated MoO3 nanosheets and d) the SC CO2-treated MoO3 nanosheets. e) The corresponding SAED pattern of SC CO2-treated sample. f) Schematic representation of the formation process of amorphous MoO3 with biaxial strain using SC CO2. Reprinted from reference [71]. Copyright 2017, Wiley-VCH. Energy Environ. Mater. 2018, 1, 46–60 57 © 2018 Zhengzhou UniversityPDF Image | CO2 and 2-Dimensional Nanomaterials with Green Chemistry
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