Haoran Zhang
Chinese Academy of Sciences
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Publication
Featured researches published by Haoran Zhang.
Applied Physics Letters | 2009
Sun Y; Haoran Zhang; Aimin Wang; H.M. Fu; Z. Q. Hu; Cuie Wen; Peter Hodgson
We report an Mg-based metallic glass/titanium interpenetrating phase composite in which constituent phases form a homogeneously interconnected network. The porous titanium constrains shear bands propagation thoroughly and promotes shear bands branching and intersection subsequently. The homogeneous phase distribution promotes regularly distributed local shear deformation and leads to a uniform deformation for the composites. Moreover, the interpenetrating phase structure introduces a mutual-reinforcement between metallic glass and titanium. Therefore, the composite exhibits excellent mechanical performance with compressive fracture strength of 1783 MPa and fracture strain of 31%.
Nature Communications | 2014
Da Jiang; Tao Hu; Lixing You; Qiao Li; Ang Li; Haomin Wang; Gang Mu; Zhiying Chen; Haoran Zhang; Guanghui Yu; Jie Zhu; Qiujuan Sun; Chengtian Lin; Hong Xiao; Mianheng Jiang
High-Tc superconductors confined to two dimension exhibit novel physical phenomena, such as superconductor-insulator transition. In the Bi2Sr2CaCu2O(8+x) (Bi2212) model system, despite extensive studies, the intrinsic superconducting properties at the thinness limit have been difficult to determine. Here, we report a method to fabricate high quality single-crystal Bi2212 films down to half-unit-cell thickness in the form of graphene/Bi2212 van der Waals heterostructure, in which sharp superconducting transitions are observed. The heterostructure also exhibits a nonlinear current-voltage characteristic due to the Dirac nature of the graphene band structure. More interestingly, although the critical temperature remains essentially the same with reduced thickness of Bi2212, the slope of the normal state T-linear resistivity varies by a factor of 4-5, and the sheet resistance increases by three orders of magnitude, indicating a surprising decoupling of the normal state resistance and superconductivity. The developed technique is versatile, applicable to investigate other two-dimensional (2D) superconducting materials.
Journal of Electronic Materials | 2015
Haoran Zhang; Yanhui Zhang; Bin Wang; Zhiying Chen; Yanping Sui; Yaqian Zhang; Chunmiao Tang; Bo Zhu; Guanghui Yu; Zhi Jin; Xinyu Liu
Analysis of graphene domain synthesis explains the main graphene growth process. Size-limited graphene growth caused by hydrogen is studied to achieve efficient graphene synthesis. Graphene synthesis on Cu foils via the chemical vapor deposition method using methane as carbon source is limited by high hydrogen concentration. Results indicate that hydrogen affects graphene nucleation, the growth rate, and the final domain size. Considering the role of hydrogen as both activator and etching reagent, we build a model to explain the cause of this low graphene growth rate for high hydrogen partial pressure. A two-step method is proposed to control the graphene nucleation and growth rate separately. Half the time is required to obtain similar domain size compared with single-step synthesis, indicating improved graphene synthesis efficiency. The change of the partial pressure and transmission time between the two steps is a factor that cannot be ignored to control the graphene growth.
Chinese Physics B | 2017
Rongxuan Deng; Haoran Zhang; Yanhui Zhang; Zhiying Chen; Yanping Sui; Xiaoming Ge; Yijian Liang; Shike Hu; Guanghui Yu; Da Jiang
Graphene-based heterostructure is one of the most attractive topics in physics and material sciences due to its intriguing properties and applications. We report the one-step fabrication of a novel graphene/Mo2C heterostructure by using chemical vapor deposition (CVD). The composition and structure of the heterostructure are characterized through energy-dispersive spectrometer, transmission electron microscope, and Raman spectrum. The growth rule analysis of the results shows the flow rate of methane is a main factor in preparing the graphene/Mo2C heterostructure. A schematic diagram of the growth process is also established. Transport measurements are performed to study the superconductivity of the heterostructure which has potential applications in superconducting devices.
Applied Physics Letters | 2015
Zhiying Chen; Yanhui Zhang; Haoran Zhang; Yanping Sui; Yaqian Zhang; Xiaoming Ge; Guanghui Yu; Xiaoliang Li; Zhi Jin; Xinyu Liu
We developed a counter-doping method to tune the electronic properties of chemical vapor deposition (CVD)-grown graphene by varying the concentration and time of graphene exposure to hydrazine hydrate (N2H4·H2O). The shift of G and 2D peaks of Raman spectroscopy is analyzed as a function of N2H4·H2O concentration. The result revealed that N2H4·H2O realized n-type doping on CVD grown graphene. X-ray photoelectron spectroscopy measurement proved the existence of nitrogen, which indicated the adsorption of N2H4 on the surface of graphene. After counter-doping, carrier mobility, which was measured by Hall measurements, increased three fold.
Journal of Electronic Materials | 2015
Yaqian Zhang; Haoran Zhang; Yanhui Zhang; Zhiying Chen; Chunmiao Tang; Yanping Sui; Bin Wang; Xiaoliang Li; Guanghui Yu; Zhi Jin; Xinyu Liu
Cu(111) is a suitable substrate for sixfold graphene domain synthesis, as confirmed theoretically and experimentally. However, an undulate striped structure, where stretched flower-like or approximate diamond-shaped graphene domains had formed, appeared on Cu(111) after annealing and growth in our study. Graphene domains were stretched along the undulate stripes. The Cu surface coated with graphene domains was flatter than the surrounding undulate striped structure. Oxygen plasma was used to remove the graphene coating, and the exposed Cu was also flat. We propose that slight steps formed on Cu(111) in the annealing process. The faster rate of graphene growth along these steps contributed to the stretching domain shape. Furthermore, the release of internal stress or the shrinking of Cu during cooling promotes the expansion step to form an undulate striped structure. However, the coated Cu step motion is limited by graphene. Consequently, the resulting surface is flat, thereby clearly indicating a graphene–Cu interaction.
Carbon | 2016
Yanhui Zhang; Haoran Zhang; Feng Li; Haibo Shu; Zhiying Chen; Yanping Sui; Yaqian Zhang; Xiaoming Ge; Guanghui Yu; Zhi Jin; Xinyu Liu
Carbon | 2014
Bin Wang; Yanhui Zhang; Haoran Zhang; Zhiying Chen; Yanping Sui; Xiaoliang Li; Guanghui Yu; Lizhong Hu; Zhi Jin; Xinyu Liu
Carbon | 2015
Yanping Sui; Bo Zhu; Haoran Zhang; Haibo Shu; Zhiying Chen; Yanhui Zhang; Yaqian Zhang; Bin Wang; Chunmiao Tang; Guanghui Yu; Zhi Jin; Xinyu Liu
Archive | 2015
Zhiying Chen; Zhi Jin; Yanping Sui; Guanghui Yu; Xinyu Liu; Haoran Zhang; Yanhui Zhang; Yaqian Zhang; Xiaoliang Li; Xiaoming Ge