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| 1 | Exploitation of Bi2O2Se/graphene van der Waals heterojunction for creating efficient photodetectors and short-channel field-effect transistors显示文摘The formation of heterojunction within solid-state devices enables them with eventually high performances,but provides a challenge for material synthesis and device fabrication because strict conditions such as lattice match are needed.Herein,we show a facile method to fabricate a van der Waals(vdW)heterojunction between two-dimensional(2D)bismuth oxyselenide(Bi2O2Se)and graphene,during which the graphene is directly transferred to the Bi2O2Se and served as a lowcontract-resistant electrode with small work function mismatch(~50 meV).As an optoelectronic device,the Bi2O2Se/graphene vdW heterojunction allows for the efficient sensing toward 1200-nm incident laser.Regarding the application of fieldeffect transistors(FETs),the short-channel(50 nm)sample can be synthesized by utilizing these two 2D materials(ie,channel:Bi2O2Se;drain/source terminal:graphene)and the n-type characteristic can be observed with the accordant field modulation.It is confirmed that we show a simple way to prepare the vdW heterojunction which is aiming to the high-performance applications among optoelectronics and FETs. | Congwei Tan Shipu Xu Zhenjun Tan Luzhao Sun Jinxiong Wu Tianran Li Hailin Peng | 2019 | InfoMat2019，1，3： | 8 |
| 2 | Twin boundary: Controllable interface to fatigue cracking显示文摘Twin boundaries(TBs) are key factors influencing the mechanical properties of crystalline materials. We have investigated the intrinsic fatigue cracking mechanisms of TBs during the past decade. The effects of TB orientations on the fatigue cracking mechanisms were revealed via cyclic deformation of a series of grown Cu bicrystals with a sole TB. Furthermore, the combined effects of crystallographic orientation and stacking fault energy(SFE) on the fatigue cracking mechanisms were clarified through cyclic deformation of polycrystalline Cu and Cu alloys. Both developments were reviewed in this report which will provide implications to optimize the interfacial design for the improvement of fatigue performance of metallic materials. | Zhefeng Zhang Linlin Li Zhenjun Zhang Peng Zhang | 2017 | Journal of Materials Science & Technology2017，33，7： | 2 |
| 3 | Effect of Build Direction on Fatigue Performance of L-PBF 316L Stainless Steel显示文摘The microstructure and fatigue and tensile properties of 316 L stainless steel fabricated via laser powder bed fusion(L-PBF)were investigated.Two 316 L stainless steel specimens with different loading directions which are either perpendicular to or parallel to building direction were prepared by L-PBF process.The results of X-ray diffraction tomography showed that there was no significant difference in morphology and size/distribution of the defects in the HB and VB samples.Since long axis of columnar grains is generally parallel to the build direction,the fatigue crack encounters more grain boundaries in VB samples under cyclic loading,which led to enhanced fatigue resistance of VB samples compared with HB sample.In contrast to HB sample,the VB sample has a higher fatigue strength due to a higher resistance to localized plastic deformation under cyclic loading.The differences in fatigue properties of L-PBF 316 L SS with different build directions were predominantly controlled by solidification microstructures. | Chenfan Yu Yuan Zhong Peng Zhang Zhenjun Zhang Congcong Zhao Zhefeng Zhang Zhijian Shen Wei Liu | 2020 | Acta Metallurgica Sinica(English Letters)2020，33，4： | 1 |
| 4 | Growth of 12-inch uniform monolayer graphene film on molten glass and its application in PbI2-based photodetector显示文摘Direct growth of large area uniform graphene on functional insulating materials is essential for engineering versatile applications of graphene. However, the existing synthesis approaches can hardly avoid the generation of non-uniform multilayer graphene along the gas flow direction, affording huge challenges for further scaling up. Herein, by exploiting the molten state of soda-lime glass, we have accomplished the direct growth of large area uniform (up to 30 cm × 6 cm) graphene via a facile chemical vapor deposition route on low cost soda-lime glass. The use of molten glass eliminates the chemically active sites (surface corrugations, scratches, defects), and improves the mobility of carbon precursors, affording uniform nucleation and growth of monolayer graphene. Intriguingly, thus-obtained graphene acts as an ideal coating layer for the surface crystallographic modification of soda-lime glass, making it epitaxy substrates for synthesizing high-quality PbI2 nanoplates and continues films. Accordingly, a prototype photodetector was fabricated to present excellent photoelectrical properties of high responsivity (~ 600 on/off current ratio) and fast response speed (18 μs). This work hereby paves ways for the batch production and the direct applications of graphene glass as platforms for constructing high performance electronic and optoelectronic devices. | Zhaolong Chen Haina Ci Zhenjun Tan Zhipeng Dou Xu-dong Chen Bingzhi Liu Ruojuan Liu Li Lin Lingzhi Cui Peng Gao Hailin Peng Yanfeng Zhang Zhongfan Liu | 2019 | Nano Research2019，12，8： | 1 |
| 5 | Corrosion and tribocorrosion resistance of MAO-based composite coating on AZ31 magnesium alloy显示文摘In this paper, a multi-functional composite coating with low friction coefficient, high wear resistance and excellent tribocorrosion resistance is fabricated on AZ31 Mg alloys by micro-arc oxidation and spray-coating methods. The microstructure, and composition of the coating are characterized by SEM, EDS, XRD, and FT-IR. Potentiodynamic polarization and EIS tests are conducted to evaluate the corrosion resistance of the composite coating. The tribocorrosion property is also studied using pin-on-disk tribometer in 3.5 wt.% Na Cl solution. It is found that the composite coating possesses better long-term corrosion resistance than the single MAO coating. The tribocorrosion tests prove that the composite coating exhibits much better wear and tribocorrosion resistance than the single MAO coating and can protect the substrate from corrosion under a sliding condition. | Siqin Liu Guihua Li Yuming Qi Zhenjun Peng Yinping Ye Jun Liang | 2022 | Journal of Magnesium and Alloys2022，10，12： | 0 |
| 6 | Surprisingly fast cooling in graphene-based van der Waals stacks显示文摘A thorough understanding of nanoscale heat flow inheterostructures is crucial for future multifunctional na-nodevices based on 2D materials. For example, the ther-mal exchanges based on hot-carrier cooling pathways andtime in graphene devices have been rigorously in-vestigated, and these studies provide guidance for thedevelopment of electronic and optoelectronic applications[1,2]. Furthermore, defect-assisted acoustic phononscattering [3], intrinsic optical phonon (OP) cooling [4],and interlayer Coulomb coupling [5] are the three pri-mary relaxation mechanisms in diffusive, suspended, anddecoupled multilayer graphene, respectively. However,perfect supported or encapsulated graphene, in whichelectrons are coupled to remote polar phonon modes, isdifferent from the other types of graphene mentionedabove, and it lacks sufficient experimental research. | Hailin Peng Zhenjun Tan | 2018 | Science China Materials2018，61，7： | 0 |
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