Browsing by Author "Wen, Y."
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Item Chemically Modified Graphene Films with Tunable Negative Poisson’s Ratios(Nature Publishing Group, 2019-06-04) Wen, Y.; Gao, E.; Hu, Zhenxing; Xu, Tingge; Lu, Hongbing; Xu, Z.; Li, C.; Hu, Zhenxing; Xu, Tingge; Lu, HongbingGraphene-derived macroscopic assemblies feature hierarchical nano- and microstructures that provide numerous routes for surface and interfacial functionalization achieving unconventional material properties. We report that the microstructural hierarchy of pristine chemically modified graphene films, featuring wrinkles, delamination of close-packed laminates, their ordered and disordered stacks, renders remarkable negative Poisson’s ratios ranging from −0.25 to −0.55. The mechanism proposed is validated by the experimental characterization and theoretical analysis. Based on the understanding of microstructural origins, pre-strech is applied to endow chemically modified graphene films with controlled negative Poisson’s ratios. Modulating the wavy textures of the inter-connected network of close-packed laminates in the chemically modified graphene films also yields finely-tuned negative Poisson’s ratios. These findings offer the key insights into rational design of films constructed from two-dimensional materials with negative Poisson’s ratios and mechanomutable performance. © 2019, The Author(s).Item Enhanced Photosensitized Activity of a BiOCl-Bi₂WO₆ Heterojunction by Effective Interfacial Charge Transfer(2013-10-02) Yang, W.; Ma, B.; Wang, W.; Wen, Y.; Zeng, D.; Shan, BinA BiOCl-Bi₂WO₆ heterojunction with a chemically bonded interface was synthesized via a facile one-step solvothermal method. A series of characterization techniques (XRD, XPS, TEM, SEM, EDS etc.) confirmed the existence of a BiOCl-Bi₂WO₆ interface. The heterojunction yielded a higher photodegradation rate of Rhodamine B under visible light irradiation compared to its individual components. Theoretical studies based on density functional theory calculations indicated that the enhanced photosensitized degradation activity could be attributed to the favorable band offsets across the BiI-O-BiII bonded interface, leading to efficient interfacial charge carrier transfer. Our results reveal the photosensitized mechanism of BiOCl-Bi₂WO₆ heterojunctions and demonstrate their practical use as visible-light-driven photocatalytic materials.