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Controlled fabrication, lasing behavior and excitonic recombination dynamics in single crystal CH3NH3PbBr3 perovskite cuboids

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science Bulletin 2019年第10期64卷 698-704页

作者： Fangtao Li Junfeng Lu Qinglin Zhang Dengfeng Peng Zheng Yang Qian Xu Caofeng Pan Anlian Pan Tianfeng Li Rongming Wang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science School of Mathematics and Physics University of Science and Technology Beijing Beijing 100083 China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 100083 China School of Nanoscience and Technology University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory for Micro-Nano Physics and Technology of Hunan Province Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education College of Materials and Engineering Hunan University Changsha 410082 China College of Optoelectronic Engineering Shenzhen University Shenzhen 518060 China School of Physics and Electronics Henan University Kaifeng 475004 China

As a direct bandgap semiconductor, organic-inorganic lead halide perovskite (MAPbX3, MA = CH3NH3, X =Cl, Br, I) have been considered as promising materials for laser due to their excellent optoelectronic properties. The perovskite materials with ID and 2D shapes were widely prepared and studied for Fabry-Perot mode and whispering-gallery-mode (WGM) microcavities, but cuboid-shape is rarely reported. In this work, we successfully fabricated single crystal cuboid-shaped MAPbBr3 perovskite w让h different morphologies, named microcuboid-MAPbBr3 (M-MAPbBr3) and multi-step-MAPbBr3 (MSMAPbBr3), via solvothermal method. Furthermore, the as-prepared *crystals excitonic recombination lifetime under different pumping energy density was studied by time-resolved photoiuminescence (TRPL). Based on controllable morphology and remarkable lasing properties, these cuboid shaped single crystal perovskite could be a promising candidate for small laser, and other optoelectronic devices.

关键词： Lead halide perovskite Solvothermal method Single crystal cuboid Lasing TRPL

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Multifunctional Peptide-Melanin Hybrid Nanodots with Robust Anti-Cutaneous Photoaging Activity

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Journal of Analysis and Testing 2024年第3期8卷 395-401页

作者： Peizhe Li Qiming Zhu Baozhu Wang Shanshan He Qi Xu Kaiyan Li Yongmiao Shen Miao Su Zhijun Zhang Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang Province School of Chemistry and Chemical EngineeringZhejiang Sci-Tech UniversityHangzhou310018China College of Textile Science and Engineering(International Silk Institute) Zhejiang Sci-Tech UniversityHangzhou310018China Shanghai Beautyart Biotechnology Co. LtdShanghai200438China Shengzhou Innovation Research Institute of Zhejiang Sci-Tech University Shengzhou312400China

Skin aging is a systematic and complex process,mainly including intrinsic aging caused by time change and extrinsic aging caused by environmental *** caused by ultraviolet(UV)irradiation is the principle extrinsic factor of skin aging,which can directly or indirectly cause damage to DNA and other biomolecules,generate reactive oxygen species(ROS),and induce a decrease in collagen synthesis and other adverse ***,to address the causative factors and multiple side effects of skin photoaging,we constructed multifunctional peptide-melanin hybrid nanodots(PMHDs)to achieve multifaceted synergistic anti-skin aging by using melanin-like nanodots(MDs)and functional peptides as active *** them,the peptide has the activity of promoting collagen synthesis,while the MDs have the function of absorbing UV light and scavenging free ***,the MDs also act as a carrier to increase the cellular uptake of the *** anti-photoaging effects of the PMHDs were systematically verified in a multidimensional manner at the biochemical,cellular and small animal levels,respectively.

关键词： aging Skin ultraviolet

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Sulfureted Polyacrylonitrile Derived Carbon Encapsulated Silicon as High-Performance Anode Material for Lithium-Ion Batteries

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SSRN 2022年

作者： Qin, Rongrong Wang, Zhuang Li, Jinlei Deng, Lingfeng School of Materials Science and Engineering Central South University of Forestry and Technology Changsha China Hunan Province Key Laboratory of Materials Surface and Interface Science and Technology China

Silicon-based materials are the most promising anode materials for the next generation of lithium-ion batteries. However, the low conductivity, large volume effect and continuous formation of solid-electrolyte-interface (SEI) film, resulted in low rate-capability, severe electrode pulverization and aerogenesis, hinders their practical application. To enhance the electrochemical performance of silicon-based materials, in this work, sulfur-doped carbon derived from sulfurized polyacrylonitrile is used as carbon matrix for confining and encapsulating nano silicon particles. It is found that the sulfur doping can effectively enhance the cycle stability of silicon-based composite. The as-prepared silicon/sulfur-doped carbon composite with a moderate silicon content (~16.7 wt%) exhibits an initial discharge capacity of 1735 mA h g -1 and maintained at 699 mA h g -1 after 200 cycles. Even at the current density of 1 A g -1 , the 0.5gSi@SPANdC composite also exhibits good cycle stability and relatively high reversible capacity of 546.1mAh g -1 after 400 cycles. © 2022, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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Superhydrophobic Coating Constructed from Rosin Acid and Tio2 Used as Blood Repellent Dressing

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SSRN 2022年

作者： Wang, Yingxuan Li, Zhaoshuang Wang, Jiping Wang, Jingran Li, Xiangzhou Kuang, Chuntao College of Materials Science and Engineering Central South University of Forestry & Technology Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology Changsha410004 China

Fabrication of superhydrophobic coating is essential for blood repellent dressing to avoid excessive blood loss which can damage human health and even endanger life. In this study, we prepared a durable superhydrophobic coating based on rosin acid and TiO 2 for blood repellent dressing with a water contact angle of 155.7° and a sliding angle of 5°. Scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), X-ray spectroscopy (XPS) were used to characterize coating morphology and chemical composition. Water droplets were spherical and non-stick on the surface of the dressing. Meanwhile, the superhydrophobic coating can withstand at least 30 sandpaper wear cycles and 16 washing treatments without losing its superhydrophobic properties. In addition, the superhydrophobic coating exhibited excellent antimicrobial activities against Gram-positive Staphylococcus aureus ( S. aureus ) (with log reduction = 1.73) and Gram-negative Escherichia coli ( E. coli ) (with log reduction = 1.74), and effectively prevented biofilm formation. Based on in vitro experiments, it was confirmed that the superhydrophobic coating can reduce blood loss as well as high air permeability. Therefore, the superhydrophobic coating fabricated in this work provide a facile strategy to prepare novel blood repellent dressing, which may have promising applications in wound dressings. © 2022, The Authors. All rights reserved.

关键词： Coatings

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NH_(4)Cl-assisted preparation of single Ni sites anchored carbon nanosheet catalysts for highly efficient carbon dioxide electroreduction

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Journal of materials science & technology 2023年第11期142卷 1-9页

作者： Dan Ping Feng Yi Guiwei Zhang Shide Wu Shaoming Fang Kailong Hu Ben Bin Xu Junna Ren Zhanhu Guo Henan Provincial Key Laboratory of Surface&Interface Science Henan Engineering Research Center of Chemical Engineering Separation Process IntensificationSchool of Material and Chemical EngineeringZhengzhou University of Light IndustryZhengzhou 450002China School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Chemical&Biomolecular Engineering Integrated Composites Lab(ICL)University of TennesseeKnoxvilleTN 37996USA

Single-atomic transition metal-nitrogen codoped carbon(M-N-C)are efficient substitute catalysts for noble metals to catalyze the electrochemical CO_(2) reduction reaction(CO_(2)RR).However,the uncontrolled aggregations of metal and serious loss of nitrogen species constituting the M-N_(x) active sites are frequently observed in the commonly used pyrolysis ***,single-atomic nickel(Ni)-based sheet-like electrocatalysts with abundant Ni-N_(4) active sites were created by using a novel ammonium chloride(NH_(4)Cl)-assited pyrolysis *** aberration correction electron microscopy and X-ray absorption fine structure analysis clearly revealed that Ni species are atomically dispersed and anchored by N in Ni-N_(4) *** addition of NH_(4)Cl optimized the mesopore size to 7-10 nm and increased the concentrations of pyridinic N(3.54 wt%)and Ni-N_(4)(3.33 wt%)*** synergistic catalytic effect derived from Ni-N_(4) active sites and pyridinic N species achieved an outstanding CO_(2) RR performance,presenting a high CO Faradaic efficiency(FE_(CO))up to 98% and a large CO partial current density of 8.5 mA cm^(-2) at a low potential of-0.62 V ***,the FE_(CO) maintains above 80% within a large potential range from -0.43 to -0.73 V *** work provides a practical and feasible approach to building highly active single-atomic catalysts for CO_(2) conversion systems.

关键词： CO_(2)reduction Electrocatalyst Single-atomic ni NH_(4)Cl Pyridinic N

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Construction of a Porous Carbon Skeleton in Wood Tracheids to Enhance Charge Storage for High-Performance Supercapacitors

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SSRN 2022年

作者： Ouyang, Jie Wang, Xiaoman Wang, Luchi Xiong, Wanning Li, Mengyao Hua, Ziheng Zhao, Linlin Zhou, Cui Liu, Xiubo Chen, Hong Luo, Yongfeng Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology College of Science Material Science and Engineering School Central South University of Forestry and Technology Hunan Changsha410004 China

Wood with vertically aligned tracheids has many potential applications in energy storage. Carbonized wood inherits the previous tracheid structure and has good electrical conductivity, which provides favorable conditions for its application in self-supporting electrodes of supercapacitors. However, problems such as low specific surface area, low space utilization, and hydrophobicity limit the development of wood-derived carbon (WC) as an electrode material. Here, to improve the specific surface area and tracheid space utilization of WC, a porous carbon skeleton (PCS) was simply and efficiently constructed in its interior by using glucose and sodium chloride templates, and then potassium hydroxide etching treatment was used to further improve the specific surface area and hydrophilicity of the PCS, resulting in an etched porous carbon skeleton (E-PCS). The prepared E-PCS@WC electrode had an excellent area/volumetric specific capacitance of 7.29 F cm−2 /145.8 F cm−3, and the supercapacitor exhibited a high volumetric capacitance and volumetric energy density of 34.99 F cm−3 and 4.86 mWh cm−3 at a power density of 2.5 mW cm−2 . The supercapacitor constructed from this electrode exhibited good cycling stability with a retention rate of 98.5% over 20,000 cycles at a current density of 50 mA cm−3 . This research will provide new ideas and a scientific basis for the design, construction and application of new green energy storage devices. © 2022, The Authors. All rights reserved.

关键词： Supercapacitor

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Construction of a Porous Carbon Skeleton in Wood Tracheids to Enhance Charge Storage for High-Performance Supercapacitors

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SSRN 2022年

Wood with vertically aligned tracheids has many potential applications in energy storage. Carbonized wood inherits the previous tracheid structure and has good electrical conductivity, which provides favorable conditions for its application in self-supporting electrodes of supercapacitors. However, problems such as low specific surface area, low space utilization, and hydrophobicity limit the development of wood-derived carbon (WC) as an electrode material. Here, to improve the specific surface area and tracheid space utilization of WC, a porous carbon skeleton (PCS) was simply and efficiently constructed in its interior by using glucose and sodium chloride templates, and then potassium hydroxide etching treatment was used to further improve the specific surface area and hydrophilicity of the PCS, resulting in an etched porous carbon skeleton (E-PCS). The prepared E-PCS@WC electrode had an excellent area/volumetric specific capacitance of 7.29 F cm−2 /145.8 F cm−3 , and the supercapacitor exhibited a high volumetric capacitance and volumetric energy density of 34.99 F cm−3 and 4.86 mWh cm−3 at a power density of 2.5 mW cm−2 . The supercapacitor constructed from this electrode exhibited good cycling stability with a retention rate of 98.5% over 20,000 cycles at a current density of 50 mA cm−3 . This research will provide new ideas and a scientific basis for the design, construction and application of new green energy storage devices. © 2022, The Authors. All rights reserved.

关键词： Supercapacitor

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Boron Functionalized Cellulose-Nanocrystals Via Green Esterification Method as Lubricant Additive for Friction and Wear Reduction

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SSRN 2024年

作者： Cai, Yutao Meng, Yuan Cheng, Yu Guan, Minghang Liu, Xiubo School of Materials Science and Engineering Central South University of Forestry and Technology Changsha410004 China Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology Changsha410004 China

Boron Functionalized Cellulose-nanocrystal (BFC) was prepared by a facile and green esterification route. BFC had a high crystallinity of more than 80% and a needle-like morphology with a length of hundreds nm and a diameter of 10~20 nm, very similar to those of cellulose nanocrystal. The largest degree of substitution of hydroxyl by borate ester group was obtained for BFC under the optimum conditions of reaction time and temperature (5 h, 80 ℃). When used as a lubricant additive in castor oil, BFC-5-80 achieved a stable, homogeneous and monodisperse state and the tribological performances were evaluated by a reciprocating ball-on-plate tribometer. The friction coefficient and wear volume of castor oil with 2wt.% BFC-5-80 are 0.058 and 0.281×10-3 mm3 under certain conditions of load, frequency and testing time (6 N, 8 Hz, 2 hours), 23.7% and 59.2% lower than those of pure castor oil as well as 8.0% and 33.9% than those of castor oil with CNC. Based on the analysis results of worn surfaces and wear residues, the outstanding friction-reduction and anti-wear performances of BFC-5-80 can be explained by two facts that a complete film consisting of BFC-5-80 network and adsorbed castor oil molecules forms between the mating surface and a chemical transfer film composed of ferrum boride and iron oxides is also generated on the steel interface. © 2024, The Authors. All rights reserved.

关键词： Wear of materials

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High Performance of Cellulose Nanocrystal Based Bicomponent Supramolecular Hydrogel Lubricants

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SSRN 2024年

作者： Zhou, Yulong Meng, Yuan Cheng, Yu Guan, Minghang Liu, Xiubo School of Materials Science and Engineering Central South University of Forestry and Technology Changsha410000 China Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology Changsha410000 China

Cellulose nanocrystal based bicomponent supramolecular hydrogel (CNC/x-DG/y) was prepared by a simple mixing method using CNC and diglycerol (DG) as gelators. Once deionized water is set at 1 mL, CNC/x-DG/y hydrogel becomes stronger with increasing CNC content (no less than 2.4 wt%), but weakened with enhancing DG content (0.1~1.3 mL). The gelling mechanism is attributed to multiple H-bonds between DG and CNC, which can self-assemble into a three-dimensional network to effectively trap water molecules. CNC/x-DG/y hydrogel shows many advantages for lubrication application, including reversible shear thinning behaviours, satisfactory viscoelasticity, excellent creep recovery performances, outstanding anti-rust property and much lower water volatilization rate, which exactly have improved the drawbacks of water-based lubricants. CNC/2.4-DG/0.1, a typical CNC/x-DG/y hydrogel, exhibits excellent tribological performances which are deeply dependent on the applied load and the reciprocating frequency. The friction coefficient and wear volume for CNC/2.4-DG/0.1 are 0.059 and 0.81×10-3 mm3, apparently lower than those for two reference lubricants. The high performance for reducing friction and wear of CNC/2.4-DG/0.1 can be ascribed to the synergistic mending effect of CNC nanoneedles and DG molecules and the dissipative effect caused by H-bonds between CNC nanoneedles and DG molecules. © 2024, The Authors. All rights reserved.

关键词： Hydrogels

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In-situ supramolecular self-assembly strategy to fabricate carbon-doped g-C 3 N 4 microtubes: Efficient photocatalytic removal of antibiotics and bacterial inactivation

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Journal of Environmental Chemical Engineering 2025年第3期13卷

作者： Hua Lei Changhao Bian Fengyu Guo Xingning Xiao Ruibin Hu Jianhan Lin Wen Wang Hua Yang Xiaoping Dong Xianghu Laboratory Hangzhou 311231 China Key Laboratory of Agricultural Information Acquisition Technology Ministry of Agriculture and Rural Affairs China Agricultural University Beijing 100083 China School of Chemistry and Chemical Engineering Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province Zhejiang Sci-Tech University Hangzhou 310018 China State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products MOA Laboratory of Quality & Safety Risk Assessment for Agro-Products-(Hangzhou) Institute of Agro-Product Safety and Nutrition Zhejiang Academy of Agricultural-Sciences Hangzhou 310021 China Key Laboratory of Microbiological Metrology Measurement & Bio-product Quality Security State Administration for Market Regulation College of Life Sciences China Jiliang University Hangzhou 310018 China

The poor utilization of visible light and the rapid recombination of charge carriers in graphitic carbon nitride (g-C 3 N 4 ) constrain its application for photocatalytic degradation of antibiotics and sterilization. In this study, a hydrogen bond-induced supramolecular self-assembly strategy was developed to fabricate carbon-doped g-C 3 N 4 microtubes (CTCN) through the pyrolysis method. Specifically, 2,4,6-triaminopyrimidine as a dopant to replace a portion of melamine and co-assemble with cyanuric acid. Compared to bulk g-C 3 N 4 , CTCN displayed advantageous visible light absorption capability and enhanced charge carrier separation and transfer efficiency. CTCN demonstrated superior photocatalytic degradation of tetracycline hydrochloride (TC), achieving an efficiency of 99.2 % in 18 min. It achieved reaction kinetics (∼0.261 min −1 ) was up to 26.6 times higher than that of bulk g-C 3 N 4 . Additionally, CTCN exhibited almost complete photocatalytic antibacterial efficacy, inactivating ∼100 % of bacteria (including Escherichia coli , Salmonella typhimurium , and Pseudomonas aeruginosa ) within 120 min. The mechanism underlying the photocatalytic degradation of TC and the possible degradation pathways were proposed, where the superoxide radical was considered to exert a predominant function. Toxicity assessment of TC and its intermediates revealed that the degradation of TC was a gradual detoxification course. This study presents a novel self-assembly strategy for the design and fabrication of highly active and durable visible-light-responsive photocatalysts, which can effectively degrade antibiotics and kill bacteria.

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