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Anomalous enhancement oxidation of few-layer MoS_(2)and MoS_(2)/h-BN heterostructure

Nano Research 2022年第8期15卷 7081-7090页

作者： Siming Ren Yanbin Shi Chaozhi Zhang Mingjun Cui Jibin Pu Key laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Key laboratory of impact and Safety Engineering Ministry of Education of ChinaSchool of Mechanical Engineering and MechanicsNingbo UniversityNingbo 315211China

Because of profound applications of two-dimensional molybdenum disulfide(MoS_(2))and its heterostructures in electronics,its thermal stability has been spurred substantial *** employ a precision muffle furnace at a series of increasing temperatures up to 340℃to study the oxidation behavior of continuous MoS_(2)films by either directly growing mono-and fewlayer MoS_(2)on SiO_(2)/Si substrate,or by mechanically transferring monolayer MoS_(2)or hexagonal boron nitride(h-BN)onto monolayer MoS_(2)*** show that monolayer MoS_(2)can withstand high temperature at 340℃with less oxidation while the few-layer MoS_(2)films are completely oxidized just at 280℃,resulting from the growth-induced tensile strain in few-layer MoS_(2).When the tensile strain of films is released by transfer method,the stacked few-layer MoS_(2)films exhibit superior thermal stability and typical layer-by-layer oxidation behavior at similarly high ***,for the MoS_(2)/h-BN heterostructure,the h-BN film itself stacked on top is not damaged and forms many bubbles at 340℃,whereas the underlying monolayer MoS_(2)film is oxidized *** comprehensively using various experimental characterization and molecular dynamics calculations,such anomalous oxidation behavior of MoS_(2)/h-BN heterostructure is mainly due to the increased tensile strain in MoS_(2)film at elevated temperature.

关键词： molybdenum disulfide hexagonal boron nitride heterostructure enhancement oxidation tensile strain

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Quantum Dots Compete at the Acme of MXene Family for the Optimal Catalysis

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Nano-Micro Letters 2022年第10期14卷 36-82页

作者： Yuhua Liu Wei Zhang Weitao Zheng Key laboratory of Automobile Materials MOE and School of Materials Science and Engineeringand Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materialsand Electron Microscopy Centerand International Center of Future ScienceJilin UniversityChangchun 130012People’s Republic of China

It is well known that two-dimensional(2D)MXene-derived quan-tum dots(MQDs)inherit the excellent physicochemical properties of the parental MXenes,as a Chinese proverb says,“Indigo blue is extracted from the indigo plant,but is bluer than the plant it comes from.”Therefore,0D QDs harvest larger surface-to-volume ratio,outstanding optical properties,and vigorous quantum confinement ***,MQDs trigger enormous research enthusiasm as an emerging star of functional materials applied to physics,chemistry,biology,energy conversion,and *** the surface properties of small-sized MQDs include the type of surface functional groups,the functionalized surface directly determines their *** the Nobel Laureate Wolfgang Pauli says,“God made the bulk,but the surface was invented by the devil,”and it is just on the basis of the abundant surface functional groups,there is lots of space to be thereof excavated from *** are witnessing such excellence and even more promising to be ***,MQDs have been widely applied to catalysis,whereas the related reviews are rarely ***,we provide a state-of-the-art overview of MQDs in catalysis over the past five years,ranging from the origin and development of MQDs,synthetic routes of MQDs,and functionalized MQDs to advanced characterization *** explore the diversity of catalytic application and perspectives of MQDs,our review will stimulate more efforts toward the synthesis of optimal MQDs and thereof designing high-performance MQDs-based catalysts.

关键词： MXene Quantum dots Catalysis Surface groups Structure

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Contribution of trimethylamine N-oxide on the growth and pressure tolerance of deep-sea bacteria

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Journal of Oceanology and Limnology 2019年第1期37卷 210-222页

作者： YIN Qunjian ZHANG Weijia LI Xuegong ZHOU Lihong QI Xiaoqing ZHANG Chan WU Long-Fei laboratory of Deep-sea Microbial Cell Biology Institute of Deep-sea Science and Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences international associated laboratory of Evolution and Development of Magnetotactic Multicellular Organisms CNRS-Marseille/CAS-Beijing-Qingdao-Sanya CAS Key laboratory for Experimental Study under Deep-sea Extreme Conditions Institute of Deep-sea Science and Engineering Chinese Academy of Sciences AMU LCB UMR 7283 CNRS-Marseille

Trimethylamine N-oxide(TMAO) is widely dispersed in marine environments and plays an important role in the biogeochemical cycle of nitrogen. Diverse marine bacteria utilize TMAO as carbon and nitrogen sources or as electron acceptor in anaerobic respiration. Alteration of respiratory component according to the pressure is a common trait of deep-sea bacteria. Deep-sea bacteria from dif ferent genera harbor high hydrostatic pressure(HHP) inducible TMAO reductases that are assumed to be constitutively expressed in the deep-sea piezosphere and facilitating quick reaction to TMAO released from ?sh which is a potential nutrient for bacterial growth. However, whether deep-sea bacteria universally employ this strategy remains unknown. In this study, 237 bacterial strains affliated to 23 genera of Proteobacteria,Bacteroidetes, Firmicutes and Actinobacteria were isolated from seawater, sediment or amphipods collected at dif ferent depths. The pressure tolerance and the utilization of TMAO were examined in 74 strains. The results demonstrated no apparent correlation between the depth where the bacteria inhabit and their pressure tolerance, regarding to our samples. Several deep-sea strains from the genera of Alteromonas, Halomonas,Marinobacter, Photobacterium, and Vibrio showed capacity of TMAO utilization, but none of the isolated Acinebacter, Bacillus, Brevundimonas, Muricauda, Novosphingobium, Rheinheimera, Sphingobium and Stenotrophomonas did, indicating the utilization of TMAO is a species-speci?c feature. Furthermore, we noticed that the ability of TMAO utilization varied among strains of the same species. TMAO has greater impact on the growth of deep-sea isolates of Vibrio neocaledonicus than shallow-water isolates. Taken together, the results describe for the ?rst time the TMAO utilization in deep-sea bacterial strains, and expand our understanding of the physiological characteristic of marine bacteria.

关键词： marine bacteria Trimethylamine N-oxide(TMAO) high hydrostatic pressure(HHP) pressure tolerance phenotype

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Photoexcitation-induced passivation of SnO2 thin film for efficient perovskite solar cells

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National Science Review 2023年第11期10卷 183-191页

作者： Nianyao Chai Xiangyu Chen Zhongle Zeng Ruohan Yu Yunfan Yue Bo Mai Jinsong Wu Liqiang Mai Yi-Bing Cheng Xuewen Wang State Key laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of Technology National Energy Key laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu Laboratory

A high-quality tin oxide electron transport layer(ETL) is a key common factor to achieve high-performance perovskite solar cells(PSCs). However, the conventional annealing technique to prepare high-quality ETLs by continuous heating under near-equilibrium conditions requires high temperatures and a long fabrication time. Alternatively, we present a non-equilibrium, photoexcitation-induced passivation technique that uses multiple ultrashort laser pulses. The ultrafast photoexcitation and following electron–electron and electron–phonon scattering processes induce ultrafast annealing to efficiently passivate surface and bulk defects, and improve the crystallinity of Sn O2, resulting in suppressing the carrier recombination and facilitating the charge transport between the ETL and perovskite interface. By rapidly scanning the laser beam, the annealing time is reduced to several minutes, which is much more efficient compared with conventional thermal annealing. To demonstrate the university and scalability of this technique, typical antisolvent and antisolvent-free processed hybrid organic–inorganic metal halide PSCs have been fabricated and achieved the power conversion efficiency(PCE) of 24.14% and 22.75% respectively, and a12-square-centimeter module antisolvent-free processed perovskite solar module achieves a PCE of 20.26%,with significantly enhanced performance both in PCE and stability. This study establishes a new approach towards the commercialization of efficient low-temperature manufacturing of PSCs.

关键词： photoexcitation-induced passivation ultrafast laser carrier management electron transport layer perovskite solar cells

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Numerical investigation on free air blast loads generated from center-initiated cylindrical charges with varied aspect ratio in arbitrary orientation

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Defence Technology（防务技术） 2022年第9期18卷 1662-1678页

作者： Chu Gao Xiang-zhen Kong Qin Fang Jian Hong Yin Wang State Key laboratory of Disaster Prevention&Mitigation of Explosion&impact Army Engineering University of PLAJiangsuNanjing210007China Inner Mongolia University of Finance and Economics Inner MongoliaHohhot010070China Engineering Research Center for Safety and Protection of Explosion&impact of Ministry of Education Southeast UniversityJiangsuNanjing211189China

In current guidelines, the free air blast loads(overpressure and impulse) are determined by spherical charges, although most of ordnance devices are more nearly cylindrical than spherical in geometry. This may result in a great underestimation of blast loads in the near field and lead to an unsafe ***, there is still a lack of systematic quantitative analysis of the blast loads generated from cylindrical charges. In this study, a numerical model is developed by using the hydrocode AUTODYN to investigate the influences of aspect ratio and orientation on the free air blast loads generated from center-initiated cylindrical charges. This is done by examining the pressure contours, the peak overpressures and impulses for various aspect ratios ranged from 1 to 8 and arbitrary orientation monitored along every azimuth angle with an interval of 5°. To characterize the distribution patterns of blast loads,three regions, i.e., the axial region, the vertex region and the radial region are identified, and the propagation of blast waves in each region is analyzed in detail. The complexity of blast loads of cylindrical charges is found to result from the bridge wave and its interaction with primary waves. Several empirical formulas are presented based on curve-fitting the numerical data, including the orientation where the maximum peak overpressure emerges, the critical scaled distance beyond which the charge shape effect could be neglected and blast loads with varied aspect ratio in arbitrary orientation, all of which are useful for blast-resistant design.

关键词： Cylindrical charge Blast loads Aspect ratio Azimuth angle Bridge wave

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Hierarchical FeO_(χ)H_(y)@Ni_(3)B hybrid for efficient alkaline oxygen evolution at high current density

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Journal of Energy Chemistry 2024年第7期94卷 599-607页

作者： Fuxi Liu Qing Liang Zhenyu Li Meiqi Liu Nailin Yue Zizhun Wang Xu Zou Wei Zhang Key laboratory of Automobile Materials Ministry of Education School of Materials Science&EngineeringElectron Microscopy CenterInternational Center of Future ScienceJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsJilin UniversityChangchun 130012JilinChina

Electrocatalysts with high activity and long-term durability are vital toward large-scale hydrogen pro-duction from electrocatalytic water ***,the self-supported electrode(FeO_(χ)H_(y)@Ni_(3)B/NF)with hierarchical heterostructure was simply prepared by using Ni_(3)B chunks grown on nickel foam as sub-strate to in situ form vertical FeO_(χ)H_(y)*** hybrid shows efficient oxygen evolution reaction activity with overpotentials as low as 267 and 249 mV at 100 mA cm^(-2)in 1 M KOH solution and 30 wt%KOH solution,***,it also exhibits excellent catalytic stability,sustaining catalysis at 500 mA cm^(-2)in 1 M KOH solution for 200 h,and even for 200 h at 1000 mA cm^(-2)in 30 wt%KOH *** experimental results reveal that the FeO_(χ)H_(y)@Ni_(3)B/NF is endowed with superhydrophilic and superaerophobic surface properties,which not only provide more mass transport channels,as well as facilitated the diffusion of reaction intermediates and gas ***,it holds faster reaction kinetics,more accessible active sites and accelerated electron transfer rates due to strong synergistic interactions attheheterogeneous interface.

关键词： FeO_(χ)H_(y)@Ni_(3)B/NF hybrid Heterostructure Oxygen evolution reaction Electrocatalytic

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Boson peak in Sm-Al-Co ternary metallic glasses and its possible structural origin

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Chinese Physics B 2010年第1期19卷 441-445页

作者：刘慧美陆成亮王克锋刘俊明王清董闯 laboratory of Solid State Microstructures Nanjing University international Centre for Materials Physics Chinese Academy of Sciences State Key laboratory of Materials Modification Dalian University of Technology

The low temperature specific heat of Sm-AI-Co ternary metallic glasses is investigated and a clear anomaly associated with the Boson peak is identified. While this anomaly depends slightly on the chemical composition, it has no dependence on external magnetic field. To figure out the mechanism of the Boson peak, we interpret the data within various model frameworks. Unlike earlier work, our study shows that this Boson peak is mainly ascribed to an additional T2 term of the specific heat, which may originate from the quasi-two-dimensional and short-range ordered structure units possibly existing in the metallic glasses.

关键词： metallic glasses Boson peak specific heat

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Terpyridine-Grafted Nitrogen-Terminal Endowing Cyanine with Metal-Ion-Regulated Photophysical Properties for Cancer Theranostics

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Research 2023年第4期2023卷 117-130页

作者： Junfei Zhu Gang He Peng-Hang Chen Yajie Zhang Yafei Zhang Shan Lei Yu Zhang Meng Li Peng Huang Jing Lin Marshall laboratory of Biomedical Engineering International Cancer CenterLaboratory of Evolutionary Theranostics(LET)Guangdong Key Laboratory for Biomedical Measurements and Ultrasound ImagingSchool of Biomedical EngineeringShenzhen University Medical SchoolShenzhen 518060China

Heptamethine cyanines(Cy7)are one of the most important dyes in bioimaging and phototherapy,but they often suffer from poor photostability or limited photothermal conversion ***,a facile molecular engineering approach to regulating the photophysical properties of Cy7 by metal ions is *** innovatively modifying the nitrogen with functional groups,a novel terpyridine-grafted nitrogen-terminated Cy7 scaffold(denoted as CydtPy)was synthesized and exhibited tunable photophysical properties when chelating with various metal ions(Mn^(2+),Fe^(2+),etc.).In comparison with metal-ion-free PEGylated CydtPy(LET-11),Mn^(2+)-chelated LET-11(namely,LET-11-Mn)exhibited the increased fluorescence emission intensity,and Fe^(2+)-chelated LET-11(namely,LET-11-Fe)showed the enhanced photostability with~2-fold increase in photothermal conversion *** simply switching the chelated metal ion species,LET-11-Mn or LET-11-Fe could be used for near-infrared fluorescence imaging,magnetic resonance imaging,or photoacoustic ***,LET-11-Fe displayed superior synergistic efficacy of photothermal therapy and chemodynamic therapy both in vitro and in *** work not only provides a new strategy for regulating the photophysical properties of cyanine dyes but also establishes a versatile nanoplatform for cancer theranostics.

关键词： versatile terminated cyanine

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Effect of annealing temperature of Bi_(1.5)Zn_(1.0)Nb_(1.5)O_7 gate insulator on performance of ZnO based thin film transistors

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Journal of Semiconductors 2016年第7期37卷 76-81页

作者：叶伟任巍史鹏蒋庄德 Electronic Materials Research laboratory Key Laboratory of the Ministry of Education & International Center for Dielectric ResearchXi'an Jiaotong University State Key laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University

The bottom-gate structure ZnO based thin film transistors （ZnO-TFTs） using Bi1.5Zn1.0Nb1.507 （BZN） thin films as gate insulator were fabricated on Pt/SiO2/Si substrate by radio frequency magnetic sputtering. We investigated the effect of annealing temperature at 300, 400, and 500℃ on the performance of BZN thin films and ZnO-TFTs. XRD measurement confirmed that BZN thin films were amorphous in nature. BZN thin films annealed at 400℃ obtain the high capacitance density of 249 nF/cm2, high dielectric constant of 71, and low leakage current density of 10^-7 A/cm2 ordoff current ratio and field effect mobility of ZnO-TFTs annealed at 400℃ are approximately one order of magnitude and two times, respectively higher than that of ZnO-TFTs annealed at 300℃. When the annealing temperature is 400℃, the electrical performance of ZnO-TFTs is enhanced remarkably. Devices obtain a low sub-threshold swing of 470 mV/dec and surface states density of 3.21×10^12cm^-2.

关键词： pyrochlore BZN thin films ZnO-TFTs RF magnetron sputtering annealing temperature

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Role of retained austenite in advanced high-strength steel:ductility and toughness

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Journal of Iron and Steel Research international 2024年第9期31卷 2079-2089页

作者： Vung Lam Nuam Hao Zhang Ying-chun Wang Zhi-ping Xiong National Key laboratory of Science and Technology on Materials under Shock and impact School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing100081China Tangshan Key laboratory of High-Performance Metals and Ceramics Tangshan Research Institute BITTangshan063000HebeiChina

Enhancing the ductility and toughness of advanced high-strength steels is essential for the wide range of promising *** retained austenite(RA)is a key phase due to the austenite-to-martensite transformation and its transformation-induced plasticity *** is commonly accepted that slow RA-to-martensite transformation is beneficial to ductility;therefore,the RA fraction and stability should be carefully *** RA stability is related to its morphology,size,carbon content,neighboring phase and ***,these factors are *** is noteworthy that the influence of RA on ductility and fracture toughness is not consistent because of their difference in stress *** is no clear relationship between fracture toughness and tensile ***,it is important to understand the role of RA in *** toughness is enhanced during the RA-to-martensite transformation,while the fracture toughness is decreased due to the formation of fresh and brittle *** a result,the findings regarding to the effect of RA on fracture toughness are *** investigations should be conducted in order to fully understand the effects of RA on ductility and fracture toughness,which can optimize the combination of ductility and toughness in AHSSs.

关键词： Retained austenite Ductility Toughness TRIP effect Steel

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