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Based on the first-principles study, the adsorption and electron transfer properties of Li atom at different sites of SnS2 monolayer, SnS2@Graphene 2D-nanocomposite are analyzed. The differential charge density and density of states (DOS) analysis show that the graphene substrate as an electron donor can change the 2D-nanocomposite from a semiconductor to a metal, and reduce the adsorption energy of Li atom by decreasing the charge transferring from Li atom to SnS2. This indicates that graphene substrate is beneficial for improving the performance of SnS2@Graphene. Meanwhile, the Li atoms tend not to cluster on the SnS2@Graphene 2D-nanocomposite, which is useful to prolong the lifespan of the SnS2@Graphene. The functionality of graphene in SnS2@Graphene 2D-nanocomposite is proved by other electron donor substrates, such as a two-H-atom model and a Sn (111) substrate model. All the results indicate that the graphene, as an electron donor in SnS2@Graphene 2D-nanocomposite, plays a key role in improving the performance of SnS2 in rechargeable lithium batteries. [ABSTRACT FROM AUTHOR]

We herein report a new coordination network that deforms in a smooth and reversible manner under either thermal or pressure stimulation. Concomitantly, the organic fluorophores coordinatively bound to the channel in a face-to-face arrangement respond to this structural deformation by finely adapting their conformation and arrangement. As a result, the material exhibits a remarkable dual-stimuli-responsive luminescence shift across almost the entire visible region: The emission color of the crystal gradually changes from cyan to green upon heating and then to red upon pressure compression. Furthermore, each stage exhibits a linear dependence of both the emission maximum and intensity on the stimulus and is fully reversible., (© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)