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1Influence of Carbonation on the Electrical Conductivity of Graphene/Cement Composite显示文摘The electrical conductivity of graphene/cement composite before and after carbonation was tested by a four-electrode method.The General Effective Media equation was adopted to fit the experiment results.EIS(electrochemical impedance spectroscopy)was employed to study the effect of carbonation on conductivity of graphene/cement composite.The mechanism was analyzed by SEM(scanning electron microscopy).It is revealed that electrical conductivity increases with increasing carbonation depth when the graphene content is less than 2.0%.In this case,the electrical conductivity of composite depends on cement matrix which can be enhanced by carbonation product through filling pores.When the graphene content exceeds 3.3%,the electrical conductivity decreases with increasing carbonation depth.The conductive path is mainly formed by graphene chains which can be broke by carbonation product.The GEM(General Effective Media)equation fits the experimental results well and can be used to calculate the electrical conductivity of graphene/cement composite after carbonation.徐宁 蒋林华 ZHOU Huaiming CHU Hongqiang JIANG Peng 2021Journal of Wuhan University of Technology(Materials Science)2021,36,6:0
2Coupling Mechanism between Tamm Plasmon Polaritons and Monolayer WS_(2) Embedded in Metal/Dielectric Bragg Reflector Hybrid Architecture显示文摘To reveal and utilize the interaction between Tamm plasmon polaritons(TPPs)and two-dimensional materials are promising for exploiting next-generation optoelectronic devices.Herein,the coupling mechanism between metal TPPs and monolayer WS_(2) along with its differences from that between metal TPPs and graphene was studied in detail by using the transfer matrix method.The experimental results show that it is difficult to excite TPPs at the boundary between monolayer WS_(2) and dielectric Bragg reflector(DBR)such that the strong coupling mainly stems from the interaction between metal TPPs and exciton in monolayer WS_(2).However,the coupling in graphene/DBR/metal hybrid structure derives from the interaction between two different TPP resonance modes.Thus,evolutions of Rabi splitting with various structural parameters including spacer thickness,incident angle and DBR period greatly differ from those observed in graphene/DBR/metal hybrid structure.In addition,the discrepancies induced via metal Ag and Au films as well as the possible influence mechanism were also discussed.贾光一 YUE Ke YANG Wenxin 黄珍献 LIANG Qiqi LI Yin 2021Journal of Wuhan University of Technology(Materials Science)2021,36,6:0
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