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Optoelectronic tuning of plasmon resonances via optically modulated hot electrons

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National Science Review 2024年第5期11卷 134-141页

作者： Jiacheng Yao Cheng Wang Chi Zhang Song Ma Li Zhou ti Wang Ququan Wang Hongxing xu Tao Ding Key Laboratory of Artificial Micro Nano Structure of Ministry of Education School of Physics and Technology Wuhan University Department of Physics Southern University of Science and Technology

Fast optical modulation of nanoplasmonics is fundamental for on-chip integration of all-optical *** various strategies have been proposed for dynamic modulation of surface plasmons, critical issues of device compatibility and extremely low efficiency in the visible spectrum hamper the application of optoplasmonic nanochips. Here we establish an optoplasmonic system based on Au@Cu2–xS hybrid core–shell nanoparticles. The optical excitation of hot electrons and their charge transfer to the semiconductor coating(Cu2–xS) lead to lowered electron density of Au, which results in the red shift of the localized surface plasmon resonance. The hot electrons can also transport through the Cu2–xS layer to the metal substrate, which increases the conductance of the nanogap. As such, the coupled gap plasmon blue-shifts with a magnitude of up to ～15 nm, depending on the excitation power and the thickness of the coatings, which agrees with numerical simulations. All of this optoelectronic tuning process is highly reversible, controllable and fast with a modulated laser beam, which is highly compatible and sufficiently useful for on-chip integration of nanophotonic devices.

关键词： hot carriers plasmon switching optoplasmonics circuit modelNPoM

Surviving winter on the Qinghai-Xizang Plateau:Extensive reversible protein phosphorylation plays a dominant role in regulating hypometabolism in hibernating Nanorana parkeri

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Zoological Research 2024年第1期45卷 1-12页

作者： Yong-Gang Niu Deng-Bang Wei xue-Jing Zhang ti-Sen xu Xiang-Yong Li Hai-Ying Zhang Zhi-Fang An Kenneth B.Storey Qiang Chen Department of Life Sciences Dezhou UniversityDezhouShandong 253023China State Key Laboratory of Plateau Ecology and Agriculture Qinghai UniversityXiningQinghai 810016China School of Life Sciences Lanzhou UniversityLanzhouGansu 730000China Department of Biology Carleton UniversityOttawaON K1S 5B6Canada

Changes in protein abundance and reversible protein phosphorylation(RPP)play important roles in regulating hypometabolism but have never been documented in overwintering frogs at high *** test the hypothesis that protein abundance and phosphorylation change in response to winter hibernation,we conducted a comprehensive and quantitative proteomic and phosphoproteomic analysis of the liver of the Xizang plateau frog,Nanorana parkeri,living on the Qinghai-Xizang *** total,5170 proteins and 5695 phosphorylation sites in 193. proteins were *** on proteomic analysis,674 differentially expressed proteins(43. up-regulated,23. down-regulated)were screened in hibernating *** versus summer *** enrichment analysis revealed that higher expressed proteins in winter were significantly enriched in immune-related signaling pathways,whereas lower expressed proteins were mainly involved in metabolic processes.A total of 4251 modified sites(4147 up-regulated,104 down-regulated)belonging to 163. phosphoproteins(1555 up-regulated,83.down-regulated)were significantly changed in the *** hibernation,RPP regulated a diverse array of proteins involved in multiple functions,including metabolic enzymatic activity,ion transport,protein turnover,signal transduction,and alternative *** changes contribute to enhancing protection,suppressing energy-consuming processes,and inducing metabolic ***,the activities of phosphofructokinase,glutamate dehydrogenase,and ATPase were all significantly lower in winter compared to *** conclusion,our results support the hypothesis and demonstrate the importance of RPP as a regulatory mechanism when animals transition into a hypometabolic state.

关键词： Nanorana parkeri Proteomic Phosphoproteomic Hibernation Reversible protein phosphorylation Metabolism

Effect of Cryogenic Treatment on Microstructure and Tribological Property Evolution of Electron Beam Melted ti6Al4V

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Journal of Wuhan University of Technology(Materials Science) 2024年第4期39卷 1010-1017页

作者：黄西娜 MA Xiaowen xu tianyi School of Mechanical and Electrical Engineering China University of Mining and Technology-BeijingBeijing 100083China School of Engineering and Technology China University of GeosciencesBeijing 100083China

Cryogenic treatment was used to improve the tribological properties of ti6Al4V artificial hip joint *** treatment at-196℃with different holding time were carried out on ti6Al4V specimens fabricated using electron beam melting(EBM),and their microstructure and tribological properties evolution were systematically analyzed by scanning electron microscopy(SEM),vickers hardness,and wear *** experimental results show that the as-fabricated specimen consists of lamellarαphase andβcolumnar ***,the thickness of lamellarαphase decreased after cryogenic *** addition,it can be found that the fineαphase was precipitated and dispersed between the lamellarαphase with the holding time *** hardness shows a trend of first increasing and then *** wear rate of the specimen cryogenic treated for 24 h is the minimum and the average friction coefficient is 0.50,which is reduced by 14.61%compared with the *** wear mechanism of the as-fabricated specimen is severe exfoliation,adhesive,abrasive,and slight fatigue ***,the specimen cryogenic treated for 24 h shows slight adhesive and abrasive *** can be concluded that it is feasibility of utilizing cryogenic treatment to reduce the wear of EBMed ti6Al4V.

关键词： electron beam melting(EBM) cryogenic treatment microstructure vickers hardness tribological property

Multiple conductive network for Kti_(2)(PO_(4))_(3.anode based on MXene as a binder for high-performance potassium storage

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Chinese Chemical Letters 2024年第8期35卷 539-544页

作者： Tong Su Yue Wang Qizhen Zhu Mengyao xu Ning Qiao Bin xu State Key Laboratory of Organic-Inorganic Composites Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China

Kti_(2)(PO_(4))_(3.is a promising anode material for potassium storage,but suffers from low conductivity and difficult balance between high capacity and good structural ***,the ti_(3.C_(2)T_(x)MXene is used as a multifunctional binder to fabricate the Kti_(2)(PO_(4))_(3.electrode by the traditional homogenizing-coating *** MXene nanosheets,together with the conductive agent super P nanoparticles,construct a multiple conductive network for fast electron/ion transfer and high electrochemical ***,the network ensures the structural stability of the Kti_(2)(PO_(4))_(3.electrode during the de-intercalation/intercalation of 4 K^(+)ions,which is beneficial for simultaneously achieving high capacity and good cycle ***,the MXene-bonded Kti_(2)(PO_(4))_(3.electrode delivers a reversible capacity of 255.2 mAh/g at 50 mA/g,outstanding rate capability with 13..3.mAh/g at 2 A/g,and ex-cellent cycle performance with 151.6 mAh/g at 1 A/g after 2000 *** work not only suggests a high-performance anode material for potassium-ion batteries,but also demonstrates that the MXene is a promising binder material for constructing conductive electrodes in rechargeable batteries.

关键词： MXene ti_(3.C_(2)T_(x) Kti_(2)(PO_(4))_(3. Anode Conductive network Potassium storage

Significantly enhanced performance and conductivity mechanism in Nb/Mn co-doped CaBi_(4)ti_(4)O_(15)ferroelectrics

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Journal of Materiomics 2024年第3期10卷 652-669页

作者： Jiageng xu Shaoxiong Xie Qian xu Jie Xing Qingyuan Wang Jianguo Zhu School of Aeronautics and Astronautics Sichuan UniversityChengdu610000China Institute for Advanced Study Chengdu UniversityChengdu610106China Department of Mechanical Engineering Kyushu UniversityFukuoka819-0395Japan College of Architecture and Environment Sichuan UniversityChengdu610065China College of Material Science and Engineering Sichuan UniversityChengdu610065China

With the rapid development of high-end industries,the demand for high-temperature piezoelectric materials is significantly ***,realizing the ultra-high performance to meet more ap-plications still faces major scientific and engineering challenges of our ***,a new Nb/Mn co-doped CaBi_(4)ti_(4)O_(15)(CBT)high-temperature piezoelectric material system of CaBi_(4)ti_(4-x)(Nb_(2/3.Mn_(1/3.)_(x)O_(15)was synthesized by the conventional solid-state sintering *** results show that the addition of the dopants tends to break the long-range ferroelectric chain and soften the flexibility of polarization,resulting in more distorted crystal structure and better ferroelectric properties of CBT *** ultra-high piezoelectric constant(d_(3.)=26.8 pC/N)is thus attained in CBT-based ceramics with x=0.12,which is about several times larger than that of pure CBT ***,numerous nano-sized layered domain structures that lie on the lateral plane of grains are observed in ceramics,with lower domain wall energy and better dynamic features under electric fields,mainly responsible for the origin of enhanced ***,excess dopants could make the conductivity mechanism of CBT ceramics transform from p-type to n-type,and also result in a shift of conduction relaxation mechanism from defect dipole rotation polarization to electron relaxation *** work not only provides a promising candidate for high-temperature piezoelectric materials,but also opens a window for opti-mizing performance by tailoring domain structures using chemical modification.

关键词： CaBi_(4)ti_(4)O_(15) Lattice distortion Electrical performance Domain structure Conductivity mechanism

Microstructure and property of laser additive manufactured alloy ti-6Al-2V-1.5Mo-0.5Zr-0.3.i after aged at different temperatures

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Rare Metals 2024年第5期43卷 2275-2281页

作者： Guo-Chao Li xu Cheng Hua-Ming Wang National Engineering Laboratory of Additive Manufacturing for Large Metallic Components and Engineering Research Center of Ministry of Education on Laser Direct Manufacturing for Large Metallic Components School of Materials Science and EngineeringBeihang UniversityBeijing 100191China

The solid solution and aging treatment for conventional manufacturing processes might not be suitable for laser additive manufactured titanium alloys due to the different lamellar *** this study,the influence of aging temperatures(600,700 and 800°C)on microstructure and mechanical properties of titanium alloy ti-6Al-2V-1.5Mo-0.5Zr-0.3.i was *** results indicate that after solid solution treatment at 970°C followed by water quenching,the alloy mainly consists of coarsening lamellar a phase in martensite α' *** at 600°C will not change the size of primary lamellar α phase but lead to huge amount of secondary a phases(α_(s))generating with very fine *** increasing the aging temperature,the number of α_(s) decreases but with coarsened *** aged at 800°C,the width of the asphase reaches 3.0 nm,almost 7 times wider than that aged at 600°*** changing size of α_(s) obviously influences the property of the *** fine α_(s) leads to high strength and microhardness but low plasticity,and specimen aged at 700°C with suitable assize has the best comprehensive properties.

关键词： α+βtitanium alloy Laser additive manufacturing Solid solution and aging treatment Microstructure Room temperature tensile property

Heterometallic Mg-Ni-Mg Complex Promoted Hydrosilylation of Alkenes: Catalytic Performance and Intermediates Characterization

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Chinese Journal of Chemistry 2024年第18期42卷 2133-2139页

作者： Yanping Cai Shengjie Jiang Xin xu Key Laboratory of Organic Synthesis of Jiangsu Province College of ChemistryChemical Engineering and Materials ScienceSoochowUniversitySuzhouJiangsu215123China

Background and Originality Content The catalytic hydrosilylation of unsaturated hydrocarbons,facilitated by transition metal(TM),is widely recognized as a proficient technique for the synthesis of high-value organosilicon compounds'ti-4l over the past few decades,the most dominant *** in hydrosilylation processes have been constituted by pre-Ccious metar complexesroceinerecent vears omore sustainabile earth-abundant metal catalysts have received increased attentionj2-14l The classcal mechanism of transition metal-catalyzed hydrosilylation is generally accomplished through a series of fundamental processes(Scheme 1a),including(i)coordination and oxidative addition of Si-H bond to a low-valent metal center to form e.g.,o-complex or silyl metal hydride;(ii)insertion of.C-C multipe bonds intometal-hdridelsior metal-silicon bond;jiol and(ii)reductive elimination that forwards the hydrosilylated product with Markovnikov or anti-Markovnikov selectivity.

关键词： Heterometallic complex Cooperative effect Hydrosilylation Magnesium Nickel hydride

Ultra-Thin Layer HTaMoO6 Catalyst for the Upgrading of Carbohydrates into 5-Hydroxymethylfurfural

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Ultra-Thin Layer HTaMoO6 Catalyst for the Upgrading of Carbo...

Effect of Heat Treatment on Microstructure and Mechanical Properties of Multiscale SiC_p Hybrid Reinforced 6061 Aluminum Matrix Composites

第4届分子科学博士后学术年会

作者： Lei Zhang Bingfeng Chen ti Zhou Xiaomeng Cheng Minghua Dong Ye Liu Huizhen Liu Qingling xu Buxing Han School of Chemistry and Chemical Engineering University of Chinese Academy of Sciences Beijing National Laboratory for Molecular Sciences CAS Laboratory of Colloid and Interface and ThermodynamicsCAS Research/Education Center for Excellence in Molecular SciencesCenter for Carbon Neutral ChemistryInstitute of ChemistryChinese Academy of Sciences Shandong IFT Science & Technology CO LTD.

The conversion of carbohydrates into 5-hydroxymethylfurfural（HMF）, a vital and valuable platform chemical, is sought after in industrial applications but poses significant challenges. In this research, we engineered an ultra-thin layer HTaMoO catalyst using ball-milling/liquid-exfoliation technique, demonstrating its efficiency in catalyzing the transformation of carbohydrates to HMF. In contrast to the conventional method utilizing tetra（n-butylammonium） hydroxide as the intercalation agent, the ball-milling/liquid-exfoliation technique not only reduces catalyst preparation time（within 12 hours） but also enhances the efficient intercalation, leading to the formation of an ultra-thin layer structure. The resulting catalyst exhibits high total acidity, a favorable Br?nsted/Lewis acid ratio, and improved accessibility of active sites due to the thin layer structure post-exfoliation. Compared with bulk LiTaMoO, the ultrathin layer HTaMoO catalyst enables complete fructose dehydration with an HMF yield reaching 89.1% under moderate reaction conditions（120 ℃, 1 hour） and 47.2% yield of HMF is obtained from sucrose at 13. ℃. This work provides a new method to fabricate the solid acid for the transformation of carbohydrates.

关键词： High speed ball-milling Liquid-exfoliation Synergistic catalysis Ultra-thin layer nanosheets 5-hydroxymethylfurfural

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Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 174-181页

作者：吴健铭许晓静 ZHANG xu LUO Yuntian LI Shuaidi HUANG Lin Institute for Advanced Manufacturing and Modern Equipment Technology Jiangsu UniversityZhenjiang 212013China

The performance of solid solution aging treatment on aluminum matrix composites prepared by powder metallurgy and reinforced with 6061 aluminum alloy powder as matrix;meanwhile, nano silicon carbide particles(nm Si Cp), submicron silicon carbide particles(1 μm Si Cp) and ti particles were studied. The Al/Si Cp composite powder was prepared by high-energy ball milling, and then cold-pressed, sintered, hotextruded, and then heat-treated with different solution temperatures and aging times for the extruded composites. Optical microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy(EDS), X-ray diffractometer(XRD) and extrusion testing were used to analyze and test the microstructure and mechanical properties of aluminum matrix composites. The results show that after the multi-stage solid solution at 53. ℃×2 h+53. ℃×2 h+540 ℃×2 h, the particles are mainly equiaxed grains and uniformly distributed. There is no reinforcement agglomeration, and the surface is dense and the insoluble phase is basically dissolved. In the matrix, the strengthening effect is good, and the hardness and compressive strength are 179.43.HV and 680.42 MPa, respectively. Under this solution process, when the aluminum matrix composites are aged at 170 ℃ for 10 h, the hardness and compressive strength can reach their peaks and increase to 195.82 HV and 721.48 MPa, respectively.

关键词： aluminum matrix composites Si C particles multiscale hybrid enhancement heat treatment mechanical properties