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Microfluidic synthesis of hollow CsPbBr3 perovskite nanocrystals through the nanoscale Kirkendall effect

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Nano Research 2024年第9期17卷 8487-8494页

作者： Yue Chen Xiaoyu Zhang Jinzhou Jiang Gaoyu Chen Kunhong Zhou Xinwen Zhang Fajing Li Caojin Yuan Jianchun Bao xiangxing xu Jiangsu Collaborative Innovation Center of Biomedical Functional Materials Jiangsu Key Laboratory of New Power BatteriesSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023China Key Laboratory for Organic Electronics and Information Displays Institute of Advanced Materials(IAM)Nanjing University of Posts and TelecommunicationsNanjing 210023China Frontiers Science Center for Flexible Electronics Institute of Flexible Electronics(IFE)Northwestern Polytechnical UniversityXi’an 710072China Jiangsu Key Laboratory for Opto-Electronic Technology School of Physics and TechnologyNanjing Normal UniversityNanjing 210023China State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093China

All inorganic metal halide perovskite nanocrystals(NCs)have attracted much attention for their outstanding optoelectronic properties,which can be tuned by the composition,surface,size and morphology in ***,we report the microfluidic synthesis of hollow CsPbBr_(3)perovskite NCs through the nanoscale Kirkendall *** formation mechanism of the hollow structure(Kirkendall void)controlled by the temperature,flow rate,ratios of precursors and ligands was *** with the solid CsPbBr_(3)NCs of the same size,the hollow CsPbBr_(3)NCs exhibit blue shifts in ultraviolet-visible(UV-vis)absorption and photoluminescence(PL)spectra,and remarkably longer PL average lifetime(~98.2 ns).Quantum confinement effect,inner surface induced additional trap states and lattice strain of the hollow CsPbBr_(3)NCs were discussed in understanding their unique optoelectronic *** hollow CsPbBr_(3)NC based photodetector exhibits an outstanding negative photoconductivity(NPC)detectivity of 8.9×10^(12)*** also show potentials in perovskite NC based photovoltaic and light emitting diodes(LEDs).

关键词： perovskite nanocrystals hollow nanocrystals nanoscale Kirkendall effect microfluidic synthesis

Ternary phase diagram of all-inorganic perovskite CsPbCl_(a)Br_(b)I_(3−a−b)nanocrystals

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Nano Research 2022年第8期15卷 7590-7596页

作者： Xin Lv Gaoyu Chen Xia Zhu Jiakun An Jianchun Bao xiangxing xu Jiangsu Key Laboratory of Biofunctional Materials Jiangsu Key Laboratory of New Power BatteriesSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210046China

All-inorganic lead halide perovskite CsPbX3(X=Cl,Br,and I)nanocrystals(NCs)have shown great application prospects in optoelectronic *** properties can be feasibly tuned by the ratio of different halide ***-synthesis halide anion exchange of Cl‒Br or Br‒I in CsPbX3 NCs allows getting any desired composition of CsPbClxBr3−x and CsPbBr_(x)I_(3−x)(0≤x≤3).However,due to the large difference of the Cl and I radii,they can only substitute each other in a limited ratio to form CsPbCl_(y)I_(3−y)(0

关键词： all-inorganic perovskite nanocrystals anion exchange ternary phase diagram

General Preparation and Shaping of Multifunctional Nanowire Aerogels for Pressure/Gas/Photo‑Sensing

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Advanced Fiber Materials 2022年第1期4卷 66-75页

作者： Xiaoyu Liu Gaoyu Chen Jianchun Bao xiangxing xu Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210046People’s Republic of China

Nanowires(NWs)with ultrahigh aspect ratio are good one-dimensional(1D)nano scafolds for building functional ***,challenges still remain in exploring methods to prepare shape designable NW aerogels with high quality,and to reveal multi functions in a single NW aerogel ***,we report a general camphene freeze-drying method for preparation of various inorganic NW aerogels(e.g,Cu,hydroxylapatite,MnO_(2)and MnOOH NW aerogels),2D graphene oxide nanosheet aerogels,organic polymer aerogels of polystyrene(post-synthesis)and resin(in situ polymerization)aerogels,which can be freely shaped in the frozen monolith *** as prepared aerogels have even distributed porosity and smooth *** camphene is cheap and can be efectively recycling collected for *** the Cu NW aerogel with even porosity and low density of 20 mg cm^(−3),multifunctional pressure/gas/photo-sensing was demonstrated.A high pressure sensitivity of 1.7 kPa^(−1)was achieved.

关键词： Nanowires Aerogel Camphene Multifunction Sensing

Ligand-controlled synthesis of high density and ultra-small Ru nanoparticles with excellent electrocatalytic hydrogen evolution performance

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Nano Research 2022年第2期15卷 1269-1275页

作者： Zhiwen Che xuyun Lu Bingfeng Cai xiangxing xu Jianchun Bao Ying Liu School of Chemistry and Materials Science Nanjing Normal UniversityNanjing 210023China

Ultra-small size metal nanoparticles(u-MNPs)have broad applications in the fields of catalysis,biomedicine and energy ***,by means of a ligand-controlled synthesis strategy,series of Ru-based NPs with high dispersity and ultra-small size(marked as u-Ru/C),or sparse and aggregated state(marked as a-Ru/C)anchored on the surface of hollow porous carbon shells are *** in-situ thermogravimetry-mass spectrometry-Fourier transform infrared spectra tests suggest that the different ligands in these Ru-based precursors can regulate the nucleation,growth and fixation of metal sites during the pyrolysis process,thus contributing to Ru NPs with various size and *** a result,when applied to hydrogen evolution reaction,the u-Ru-1/C catalyst displays a low Tafel slope of 26 mV dec-1,overpotential of 31 mV(at 10 mA cm^(-2))and a large exchange current density of 1.7 mA cm^(-2) in 1.0 M KOH,significantly better than that of the a-Ru-2/C,hollow carbon and even commercial 20%Pt/*** is mainly because that the u-Ru-1/C sample owns both smaller particle size,more electrochemical active sites,higher intrinsic activity and optimized surface H adsorption ability than that of the a-Ru-2/C *** ligand-modulated growth strategy is not only applicable to Ru,but also can be extended to other similar metals,offering a step forward in the design and synthesis of highly dispersed u-MNPs.

关键词： ultra-small Ru nanoparticles ligand in-situ test formation mechanism hydrogen evolution reaction

Fine Tuning of the Sizes and Phases of ZrO_(2)Nanocrystals

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Nano Research 2009年第11期2卷 891-902页

作者： xiangxing xu xun Wang Department of Chemistry Tsinghua UniversityBeijing 100084China

Monodisperse and pure phase zirconia(tetragonal:T-ZrO_(2);monoclinic:M-ZrO_(2))nanocrystals with finely tuned sizes as well as ultrathin T-ZrO_(2)nanowires have been selectively synthesized by a facile solvothermal *** the first time,a diagram of the size to effective strain was mapped for both T-ZrO_(2)and M-ZrO_(2),which gives a good explanation for the size-and cation doping-dependent stability of the two phases on the sub-10nm *** work may expand our understanding of the phase properties of not only zirconia,but also various other polymorphic nanocrystals.

关键词： Nanocrystals polymorphism phase stability

Reduction of the oxidative damage to H_(2)O_(2)-induced HepG2 cells via the Nrf2 signalling pathway by plant flavonoids Quercetin and Hyperoside

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Food Science and Human Wellness 2024年第4期13卷 1864-1876页

作者： Meijing Zhang Gaoshuai Zhang xiangxing Meng Xinxin Wang Jiao Xie Shaoshu Wang Biao Wang Jilite Wang Suwen Liu Qun Huang xu Yang Jing Li Hao Wang State Key Laboratory of Food Nutrition and Safety Tianjin University of Science and Technology(TUST)Tianjin 300457China Key Laboratory of Environmental Pollution Monitoring and Disease Control Ministry of EducationGuizhou Medical UniversityGuiyang 550025China College of Chemical Engineering and Materials Science Tianjin University of Science and Technology(TUST)Tianjin 300457China Department of Agriculture Hetao CollegeBayannur 015000China College of Food Science&Technology Hebei Normal University of Science and TechnologyQinhuangdao 066004China National Center of Supervision and Inspection for Processed Food Quality Tianjin Institute for Food Safety Inspection TechnologyTianjin 300457China

Hyperoside and quercetin are similar in molecular *** this study,the antioxidant regulatory targets of hyperoside and quercetin are mainly in the nuclear factor(erythroid-2-derived)-related factor 2(Nrf2)pathway predicted by network *** the antioxidant effect and mechanism of hyperoside and quercetin were measured and compared in H_(2)O_(2)-induced Hep G2 cells and Caenorhabditis *** findings indicated that quercetin was more effective than hyperoside in reducing oxidative damage,which was proved by improved cell viability,decreased reactive oxygen species(ROS)production,decreased cellular apoptosis,and alleviated mitochondrial *** addition,quercetin was more efficient than hyperoside in enhancing the expression of Nrf2-associated m RNAs,increasing the activities of superoxide dismutase(SOD),glutathione peroxidase(GSH-Px),and catalase(CAT),and reducing the cellular malondialdehyde(MDA)*** was superior to hyperoside in prolonging the lifespan of worms,decreasing the accumulation of lipofuscin,inhibiting ROS production,and increasing the proportion of skn-1 in the *** the Nrf2 inhibitor ML385,we verified that quercetin and hyperoside primarily protected the cells against oxidative damage via the Nrf2 signalling ***,molecular docking and dynamics simulations demonstrated that the quercetin-Kelch-like ECH-associated protein 1(Keap1)complex was more stable than the hyperoside-Keap1 *** stable structure of the complex might hinder the binding of Nrf2 and Keap1 to release Nrf2 and facilitate its entry into the nucleus to play an antioxidant ***,quercetin had a better antioxidant than hyperoside.

关键词： Hyperoside Quercetin HepG2 cell Oxidative damage Nrf2 signalling pathway

PbS quantum dots as a saturable absorber for ultrafast laser

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Photonics Research 2018年第11期6卷 1028-1032页

作者： LING YUN YANG QIU CONGHAO YANG JIE XING KEHAN YU xiangxing xu WEI WEI College of Electronic and Optical Engineering & College of Microelectronics Nanjing University of Posts and Telecommunications Jiangsu Key Laboratory of Biofunctional Materials School of Chemistry and Materials Science Nanjing Normal University

Low-dimensional nanomaterials, owing to their unique and versatile properties, are very attractive for enormous electronic and optoelectronic applications. PbS quantum dots(QDs), characterized by a large Bohr radius and size-tunable bandgap, are especially interesting for photonic applications in the near-infrared region. Here, oleic acid capped colloidal PbS QDs as a saturable absorber are investigated for ultrashort-pulse generation. The PbS QDs exhibit outstanding nonlinear saturable absorption properties at 1550 nm: a modulation depth up to 44.5%and a thermal damage threshold larger than 30 mJ∕cm^2. By incorporating PbS QDs into a fiber laser, a transform-limited soliton pulse as short as 559 fs with a bandwidth of 4.78 nm is realized at 1563 nm. Numerous applications may benefit from the nonlinear saturable absorption properties of PbS QDs, such as near-infrared pulsed lasers and

关键词： QDs PbS ultrafast laser

RELATIONSHIP BETWEEN M-A CONSTITUENT AND CLEAVAGE FRACTURE BEHAVIOUR OF GRANULAR BAINITIC WELD METAL

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Acta Metallurgica Sinica(English Letters) 1989年第2期2卷 143-146页

作者： xu xiangxing SU Yi ZHOU Wei Tsinghua University,Beijing,ChinaCAI Qigong Central Iron and Steel Research Institute,Ministry of Metallurgical Industry,Beijing,China xu xiangxing,Dept.of Mechanical Engineering,Tsinghua University,Beijing,100084,China

The cleavage fracture mechanism of granular bainitie weld metal in 15MnVN steel has been *** observation of a special specimen for revealing simultaneously fracture sur- face and microstructure shows that the cleavage of the weld is initiated by M-A constituent. The 95th percentile equivalent diameter of M-A constituent controls the cleavage fracture stress of the weld metal.

关键词： granular bainite M-A constituent weld cleavage fracture

MICROCRYSTALLINE RARE EARTH COMPLEX DOPED PMMA BULK FOR ORGANIC SOLID-STATE LASERS

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MICROCRYSTALLINE RARE EARTH COMPLEX DOPED PMMA BULK FOR ORGA...