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Shi Jiakuo,Chen Li,Yang Maoyou,Mi Zhishan,Zhang Mingjian,Gao Kefu,Zhang Duo,Su Shuo,Hou Weimin 한국물리학회 2022 Current Applied Physics Vol.39 No.-
Based to the first-principles calculations, we study the electronic properties of graphene/MoS2 heterostructure by modulating the vertical strains and applying external electric field. Graphene/MoS2 heterostructure is a van der Waals heterostructure (vdWH) with the interlayer spacing is 3.2 Å for the equilibrium state, and the contact property of the interface is n-type Schottky contact. The Schottky barrier height (SBH) changes with vertical strains which induces a change of charge transfer between graphene and MoS2 layer. In addition, with strain or without strain, the applied positive electric field can effectively promote the charge transfer from graphene to MoS2, while the negative electric field has the opposite effect. These findings support for the design of field effect transistors based on graphene vdWHs.
Yufeng Wang,Lihuan Mo,Kefu Chen,Jun Li,Jun Xu 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
A coagulation–flocculation process was used to treat papermaking-reconstituted tobacco slicewastewater with polyaluminium chloride (PAC) as coagulant and a cationic polyacrylamide (CPAM)as flocculant. To maximize the reduction of chemical oxygen demand (COD) and color, the jar tests werecarried out in the experiments and response surface methodology (RSM) was applied to optimize theprocess. A central composite design, i.e., a standard approach in RSM, was used to evaluate the effectsand interactions of three factors, i.e. PAC dosage, CPAM dosage and pH on the treatment efficiency. Results revealed that the maximum reduction of COD and color could be achieved at an optimalconditions, i.e., PAC = 715 mg/L, CPAM = 4.8 mg/L and pH = 6.6, from which the reduction of COD andcolor were 67.8% and 77.7%, respectively. The study also showed that the regression equations could beused as the theoretical basis for coagulation–flocculation process of papermaking-reconstituted tobaccoslice wastewater. They will be very helpful to flexibly select the appropriate process parameters in theengineering applications