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| 1 | The origin of gate bias stress instability and hysteresis in monolayer WS2 transistors显示文摘Due to the ultra-thin nature and moderate carrier mobility,semiconducting two-dimensional(2D)materials have attracted extensive attention for next-generation electronics.However,the gate bias stress instability and hysteresis are always observed in these 2D materials-based transistors that significantly degrade their reliability for practical applications.Herein,the origin of gate bias stress instability and hysteresis for chemical vapor deposited monolayer WS2 transistors are investigated carefully.The transistor performance is found to be strongly affected by the gate bias stress time,sweeping rate and range,and temperature.Based on the systematical study and complementary analysis,charge trapping is determined to be the major contribution for these observed phenomena.Importantly,due to these charge trapping effects,the channel current is observed to decrease with time;hence,a rate equation,considering the charge trapping and time decay effect of current,is proposed and developed to model the phenomena with excellent consistency with experimental data.All these results do not only indicate the validity of the charge trapping model,but also confirm the hysteresis being indeed caused by charge trapping.Evidently,this simple model provides a sufficient explanation for the charge trapping induced gate bias stress instability and hysteresis in monolayer WS2 transistors,which can be also applicable to other kinds of transistors. | Changyong Lan Xiaolin Kang You Meng Renjie Wei Xiuming Bu SenPo Yip Johnny C.Ho | 2020 | Nano Research2020，13，12： | 0 |
| 2 | Self-assembling nacre-like high-strength and extremely tough polymer composites with new toughening mechanism显示文摘Achieving high strength,deformability and toughness in polymers is important for practical industrial applications.This has remained challenging because of the mutually opposing effects of improvements to each of these properties.Here,a self-assembling nacre-like polymer composite is designed to achieve ex-tremely tough with increasing strength.This special design significantly improved polymer’s mechanical properties,including an ultra-high fracture strain of 1180%,a tensile strength of 55.4 MPa and a toughness of 506.9 MJ/m^(3),which far exceed the highest values previously reported for polymer composites.This ex-cellent combination of properties can be attributed to a novel toughening mechanism,achieved by the synergy of the domain-limiting effect of metallic glass fragments with the strain-gradient-induced orien-tation and crystallisation within the polymer during stretching.Our approach opens a promising avenue for designing robust polymer materials in armour and aerospace engineering for a range of innovative applications. | Yu Bu Xu Wang Xiuming Bu Zhengyi Mao Zhou Chen Zebiao Li Fengqian Hao Johnny C.Ho Jian Lu | 2023 | Journal of Materials Science & Technology2023，，5： | 0 |
| 3 | Direct drop-casting synthesis of all-inorganic lead and lead-free halide perovskite microcrystals for high-performance photodetectors显示文摘Due to the exciting photoelectric properties,better stability,and environmental-friendly nature,all-inorganic halide perovskites(AIHPs),especially the lead-free perovskites,have attracted worldwide attention.However,the film quality of AIHPs fabricated by typical spin-coating and subsequent high-temperature annealing is still not satisfactory,restricting their further development.Herein,we demonstrate a simple low-temperature solution-processed drop-casting method to achieve highly-crystalline cubic CsPbBr_(3)and lead-free layer-structured Cs_(3)Sb_(2)I_(9)microcrystals(MCs).This drop-casting technique not only consumes the less amount of precursor solution but also eliminates the high-temperature annealing as compared with those of spin coating.When these MCs are configured into photodetectors,they exhibit superior device performance,which is in distinct contrast to the one of spin-coated counterparts.Specifically,the responsivity of CsPbBr_(3)MCs is found to be as large as 8,990 mA/W,being 13 times larger than the spin-coated films and even better than many state-of-the-art solution-processed AIHPs devices.This device performance enhancement is attributed to the better film quality and phase purity obtained by the drop-casting method.All these results can evidently fill the“technology gap”for further enhancing the material quality of solution-processed AIHPs and breaking down the barriers that hinder the development of AIHPs based optoelectronic devices. | Zhengxun Lai You Meng Fei Wang Xiuming Bu Wei Wang Pengshan Xie Weijun Wang Chuntai Liu SenPo Yip Johnny C.Ho | 2022 | Nano Research2022，15，4： | 0 |
| 4 | Morphology and strain control of hierarchical cobalt oxide nanowire electrocatalysts via solvent effect显示文摘Designing highly efficient and low-cost electrocatalysts for oxygen evolution reaction is important for many renewable energy applications.In particular,strain engineering has been demonstrated as a powerful strategy to enhance the electrochemical performance of catalysts;however,the required complex catalyst preparation process restricts the implementation of strain engineering.Herein,we report a simple self-template method to prepare hierarchical porous Co_(3)O_(4)nanowires(PNWs)with tunable compressive strain via thermal-oxidation-transformation of easily prepared oxalic acid-cobalt nitrate(Co(NO_(3))_(2))composite nanowires.Based on the complementary theoretical and experimental studies,the selection of proper solvents in the catalyst preparation is not only vital for the hierarchical structural evolution of Co_(3)O_(4) but also for regulating their compressive surface strain.Because of the rich surface active sites and optimized electronic Co d band centers,the PNWs exhibit the excellent activity and stability for oxygen evolution reaction,delivering a low overpotential of 319 mV at 10 mA·cm^(−2)in 1 M KOH with a mass loading 0.553 mg·cm^(−2),which is even better than the noble metal catalyst of RuO_(2).This work provides a cost-effective example of porous Co_(3)O_(4)nanowire preparation as well as a promising method for modification of surface strain for the enhanced electrochemical performance. | Xiuming Bu Xiongyi Liang Kingsley O.Egbo Zebiao Li You Meng Quan Quan Yang Yang Li Kin Man Yu Chi-Man Lawrence Wu Johnny C.Ho | 2020 | Nano Research2020，13，11： | 0 |
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