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Effect of Graphene/TiO2 (001) Interface on Threshold Voltage and Nonlinearity
Yuehua Dai,Shanshan Gong,Zhisheng Zhong,Fengyu Gao,Feifei Wang,Cheng Ding,Jin Yang,Fei Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.6
In this work, the threshold voltage (Vth) and nonlinearity (NL) of Graphene (Gra)/TiO2/Gra heterojunction were studied. First, the density functional tight binding (DFTB+) and much more dynamics were used to investigate the IV curves and the resistive switching properties of TiO2 slab and Gra/TiO2/Gra heterojunction. The NL of Gra/TiO2/Gra heterojunction is stronger than that of the TiO2 slab. The Vth of the resistive transition of the heterojunction is larger than that of the TiO2 slab. The tunneling probabilities and the Mulliken atomic population at the Gra/TiO2 interface under different electric fields were calculated by the Cambridge sequential total energy package (CASTEP). Results showed that both the parameters evidently increased under a certain numerical electric field. Finally, the movement of atom in the electric field and the change in the chemical bond were simulated by DFTB+ module. The effect of the Gra/TiO2 interface on Vth and NL was further illustrated. Postponed Vth and improved NL were found at the heterojunction relative to the TiO2 slab due to the presence of the interface barrier. This work provides guidance and reference for design and optimization of TiO2-based selectors.
Qipeng Liu,Guanglong Jiang,Yuehua Gao,Pengliang Niu,Yonghua Li 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.12
Life prediction of low cycle fatigue under asymmetrical cyclic loading is still open because the mean stress has complex effect on the fatigue life. In this paper, the yield stress is introduced to the mean stress correction model with natural exponential function description and two novel improved versions of the Manson-Coffin model are proposed. Four sets of experimental fatigue data from SAE 1045 steel, 7075-T651 aluminum alloy, GH4133 super alloy and 16MnR steel are used to validate the proposed models, and the results are compared with those from Morrow model, SWT model and Kwofie model. In addition, life predictions of a turbine disc and a blisk in service conditions are implemented by the proposed models. The results show the proposed models have excellent prediction performance for low cycle fatigue life under asymmetrical cyclic loading.