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Janus MXene film with gradient structure for highly efficient terahertz and infrared electromagnetic absorption

Nano Research 2025年第1期18卷 434-442页

作者： Shaodian Yang Weiqiang Huang Zhiqiang Lin Zibo Chen Rongliang Yang Yi Jia Xuebin Liu Rui Wang Zhiping Zeng Yougen Hu Huanjun Chen Xuchun Gui11 State Key Laboratory of Optoelectronic materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China National Key Laboratory of materials for Integrated Circuits Shenzhen Institute of Advanced Electronic MaterialsShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China China Academy of Aerospace Science and Innovation Beijing 100176China guangdong Province Key Laboratory of Display Material and Technology Guangzhou 510275China School of materials Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China

Electromagnetic interference (EMI) shielding inhigh-frequency range, especially the rapidly growing terahertz(THz) frequency range, attracts increasing attention due tothe potential application of terahertz in 6G wirelesscommunication, and security inspection. However, traditionalconductive EMI films typically achieve high shieldingeffectiveness through strong reflection, which may causesecondary pollution to other devices. Here, a gradientstructure strategy was proposed to constructTi_(3)C_(2)Tx/hydroxypropyl methyl cellulose (HPMC) film, in whichthe content of Ti_(3)C_(2)Tx gradually increases along the thicknessdirection, resulting in different conductivity of the two surfaces(surface-M and surface-H) for the film. The obtained gradientfilmexhibits an EMI shielding efficiency of over 48.5 dB in theTHz range (0.2-1.6 THz) at a thickness of 40 μm. Especially,as the THz waves incident from the surface-H to the film, the absorption effectiveness reaches 48.2 dB (average absorbedpower loss up to 91.4%), and the reflection effectiveness is only 0.3 dB. In additions, the gradient-film also demonstrates ahigh absorption rate of 95.5% in the infrared band (2.5-16.7 μm). Moreover, the gradient-film exhibits an excellent tensilestress and Young’s modulus value of 173.1 MPa and 2.8 GPa, respectively. Therefore, the gradient-film proposed in thiswork, with excellent electromagnetic absorption in both THz and infrared band, provides a promising candidate for the nextgenerationEMI shielding applications.

关键词： electromagnetic interference shielding Janus film terahertz MXene

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Influence of temperature on twinning dominated pop-ins during nanoindentation of a magnesium single crystal

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Journal of Magnesium and Alloys 2022年第1期10卷 183-194页

作者： Jun Cheng Tingting Guo Matthew R.Barnett School of materials and Energy Guangdong University of TechnologyGuangzhouGuangdong 510006China institute for Frontier materials Deakin UniversityGeelongVictoria 3216Australia School of materials Science and Chemical Engineering Xi'an Technological UniversityXi'an cityShaanxi 710021.China

The present paper examines the temperature sensitivity of tensile twinning in a magnesium single crystal during nanoindentation of the prismatic plane. High temperature indentations from 25 ℃ to 250 ℃ were employed on a well polished magnesium single crystal {10-10}plane. For a indentation curve displaying a pop-in, a single twin was seen on the sample surface using Atomic Force Microscopy(AFM)imaging. For indentations that produced no pop-in, no twinning was observed. We thus conclude the pop-in arises from a twinning event in the present case. With increasing temperature, the mean pop-in load(measured from 200 repeat indentations of each testing temperature)drops markedly. This is interpreted by the thermal activation of nucleation of lattice dislocations, which immediately trigger a twinning *** activation analysis yields activation energies that are consistent with this idea. With increasing temperature the pop-ins became deeper and the twins, after further indentation, showed more growth. It is likely that non-basal slip is activated in the stress concentrations that arise during twinning and the thermal activation of this slip accounts for the observed temperature effects. It is concluded that in interpreting the temperature sensitivity of twinning stresses, any associated lattice dislocation activity must be considered.

关键词： Magnesium single crystal Twinning Temperature Nanoindentation

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Engineering Coordination Environment of Cobalt Center in Molecular Catalysts for Improved Photocatalytic CO_(2) Reduction

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Chinese Journal of Chemistry 2023年第23期41卷 3305-3310页

作者： Yuchen Wang Jihong Zhang Wei Yang Weixue Tao Keying Tao Jihua Deng Wenjie Shi Dichang Zhong Tongbu Lu MOE International Joint Laboratory of materials Microstructure Institute for New Energy Materials & Low Carbon Technologies School of Material Science & EngineeringTianjin University of TechnologyTianjin300384 China guangdong Provincial Key Laboratory of Fuel Cell Technology GuangzhouGuangdong510641 China

The creation of effective and inexpensive catalysts is essential for photocatalytic CO_(2) *** molecular catalysts,possessing definite crystal structures,are desirable to study the relationship between catalytic performance and coordination microenvironment around catalytic *** this report,we elaborately developed three Co(II)-based molecular catalysts with different coordination microenvironments for CO_(2) reduction,named[CoN_(3)O]ClO_(4),[CoN_(4)]ClO_(4),and[CoN_(3)S]ClO_(4),*** optimal[CoN_(3)O]ClO_(4) photocatalyst has a maximum TON of 5652 in photocatalytic reduced CO_(2) reduction,which is 1.28 and 1.65 times greater than that of[CoN_(4)]ClO_(4) and[CoN_(3)S]ClO_(4),*** high electronegativity of oxygen in L1(N,N-bis(2-pyridylmethyl)-N-(2-hydroxybenzyl)amine)provides the Co(II)catalytic centers with low reduction potentials and a more stable*COOH intermediate,which facilitates the CO_(2)-to-CO conversion and accounts for the high photocatalytic activity of[CoN_(3)O]ClO_(4).This work provides researchers new insights in development of catalysts for photocatalytic CO_(2) reduction.

关键词： Co(II)-based homogeneous catalysts Coordination microenvironment Photocatalysis CO_(2)reduction Homogenous catalysis

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On the rule of mixtures for bimetal composites without bonding

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Journal of Magnesium and Alloys 2020年第4期8卷 1253-1261页

作者： Bo Feng Xiaowei Feng Changjian Yan Yunchang Xin Haiyan Wang Juan Wang Kaihong Zheng guangdong institute of materials and Processing Guangdong Academy of SciencesGuangzhou 510650China International Joint Laboratory for Light Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400030China

In the present study,three types of bimetal composites,Al 6082 sleeve/Al 6082 core,Mg AZ31 sleeve/Mg AZ31 core and Al 6082 sleeve/Mg AZ31 core,were fabricated by drilling and *** rule of mixtures(ROM)for the flow curves and yield strengths during compressive test were *** results show that the ROM can predict well the experimental flow curves and yield strengths of bimetal composites without bonding,irrespectively of the different strain hardening behavior between the two components.

关键词： Magnesium alloys Aluminum alloys Composites Mechanical behavior

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Natural Variation of Leaf Thickness and Its Association to Yield Traits in indica Rice

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Journal of Integrative Agriculture 2014年第2期13卷 316-325页

作者： LIU Chuan-guang ZHOU Xin-qiao CHEN Da-gang LI Li-jun LI Ju-chang CHEN You-ding Rice Research institute Guangdong Academy of Agricultural Sciences/Guangdong Key Laboratory of New Technology in Rice Breeding

Leaf thickness is an important morphological trait in rice. Its association to the yield potential, as of now has not been documented because of the shortage of the equipment which could conveniently measure the leaf thickness in rice. In this study, the thickness of top three leaves of 208 cultivars had been determined by a nondestructive rice leaf thickness instrument for the research of the natural variation of leaves thickness and its association to yield traits in indica rice. The results showed that the flag leaf was the thickest, and the 2nd leaf was thicker than the 3rd leaf. Analysis of variance indicated the existence of wide genetic diversity of leaf thickness among the investigated indica rice genotypes. The tight correlation among the thicknesses of the top three leaves means that the leaf thickness traits share one genetic control system. Leaf thickness had a significant positive correlation with leaf length and a positive correlation with leaf width, indicated that thicker leaf was beneficial to increasing the single leaf area. The results of correlation analysis revealed that thicker leaf should be profitable to the leaf erection, higher numbers of grains per panicle and higher grains weight per panicle. However, the significantly negative correlation between leaf thickness and number of panicles per plant counteracted the profitability from increased grains weight per panicle, so that the correlations of the thicknesses of the top three leaves to yield and biomass were positive but not significantly. It has made great progress in the genetic improvement of leaves thickness in inbred indica rice breeding in guangdong Province, China, since the 1990s.

关键词： indica rice leaf thickness variation yield

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Corrosion behavior of additive-manufactured NiFeCrMo alloys in various corrosion media

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Journal of Iron and Steel Research International 2023年第8期30卷 1574-1585页

作者： Dong-peng Wang Shuai Wang Zhen Chen Xing-cheng Xie Zhen-zhen Dong Hong-zhou Dong Yi-cheng Wu Zhen-guang Liu Wei-li Li Yu-xin Wang School of materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina GRIMAT Engineering institute Co. Ltd.Beijing 101407China GRINM(guangdong)institute for new Advanced materials and Technology Dongguan 528041GuangdongChina School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina

To understand the corrosion performance of additive-manufactured Ni-based in various corrosion media during the actual engineering application environment,the corrosion properties of NiFeCrMo alloys were investigated in 3.5 wt.%NaCl solution,1 mol/L H2SO_(4) solution,and 1 mol/L KOH solution,using potentiodynamic polarization and electrochemical impedance *** electrochemical measurement results revealed that the additive-manufactured NiFeCrMo alloys have higher corrosion resistance in all three solutions,compared with the as-cast *** results of the scanning electron microscope confirmed that the degree of additive-manufactured NiFeCrMo alloys after potentiostatic polarization in all three solutions is less serious.X-ray photoelectron spectroscopy analysis revealed that the enhancement of the corrosion resistance for the additive-manufactured NiFeCrMo alloys is attributed to the modification of the composition of the passive *** manufactured processing promotes the enrichment of the element of Cr or Mo in the passive film and it suppresses the formation of the oxidation of the element of Fe,leading to higher stability of the passive *** reason for the higher corrosion resistance of the additive-manufactured NiFeCrMo alloys was related to the enrichment of the element of Cr,as well as the lower content of the elements of Ni and Fe near the grain boundaries,which are beneficial to forming a more compact passive *** combined results are essential for the applications of high-strength Ni-based as structural materials in a corrosion environment.

关键词： Ni-based alloy Additive manufacturing Corrosion Passive film Corrosion media

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Effect of In_xGa_(1-x)As Interlayer on Surface Morphology and Optical Properties of GaSb/InGaAs Type-Ⅱ Quantum Dots Grown on InP (100) Substrates

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Chinese Physics Letters 2016年第9期33卷 120-123页

作者：陈虞龙高优陈弘张辉何苗李述体郑树文 guangdong Engineering Research Center of Optoelectronic Functional materials and Devices Institute of Opto-Electronic Materials and TechnologySouth China Normal University Key Laboratory for Renewable Energy Chinese Academy of SciencesBeijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condense Matter PhysicsInstitute of PhysicsChinese Academy of Sciences College of Physics and Optoelectric Engineering Guangdong University of Technology

The effects of indium composition in InGaAs interlayer and on optical properties of GaSb/InGaAs QD material on morphology of GaSb/InGaAs quantum dots （QDs） system are studied. AFM images show that the change of the indium composition in InGaAs interlayer can alter the GaSb QD morphology. It is found that low indium composition in InGaAs interlayer can promote the formation of QDs, while high indium composition can inhibit the formation of QDs. The photoluminescence （PL） spectra of GaSb/InGaAs QDs at 8 K under low excitation power indicate that the third root of the excitation power is linear with the peak position, which provides a direct evidence for their luminescence belonging to type-Ⅱ material optical transition. The PL spectra at 8 K under an excitation power of 90row show that the optical properties of GaSb/InGaAs QD material system can be affected by the indium composition in the InGaAs interlayer, and the PL peak position is linear with the indium composition. The optical properties of GaSb/InGaAs QDs can be improved by adjusting the indium composition in the InGaAs interlayer.

关键词： InGaAs in it GaSb Quantum Dots Grown on InP Substrates x)As Interlayer on Surface Morphology and Optical Properties of GaSb/InGaAs Type of on

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Effects of multiple interruptions with trimethylindium-treatment in the InGaN/GaN quantum well on green light emitting diodes

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Chinese Physics B 2016年第10期25卷 442-445页

作者：乔良马紫光陈弘吴海燕陈雪芳杨浩军赵斌何苗郑树文李述体 guangdong Provincial Key Laboratory of Nanophotonic Functional materials and Devices Institute of Opto-Electronic Materials and Technology South China Normal University Key Laboratory for Renewable Energy Chinese Academy of Sciences Beijing Key Laboratory for New Energy Materials and Devices Beijing National Laboratory for Condense Matter Physics Institute of PhysicsChinese Academy of Sciences College of Physics and Optoelectric Engineering Guangdong University of Technology

In this study, the influence of multiple interruptions with trimethylindium(TMIn)-treatment in InGaN/GaN multiple quantum wells(MQWs) on green light-emitting diode(LED) is investigated. A comparison of conventional LEDs with the one fabricated with our method shows that the latter has better optical properties. Photoluminescence(PL) full-width at half maximum(FWHM) is reduced, light output power is much higher and the blue shift of electroluminescence(EL) dominant wavelength becomes smaller with current increasing. These improvements should be attributed to the reduced interface roughness of MQW and more uniformity of indium distribution in MQWs by the interruptions with TMIn-treatment.

关键词： TMIn-treatment InGaN/GaN quantum well green LED

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Solvothermal fabrication and luminescent properties of Eu^(2+)/Ce^(3+) doped barium lithium fluoride

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Journal of Rare Earths 2012年第10期30卷 985-989页

作者：朱国贤阳区石晓波郑文智刘应亮 School of Chemistry Science and Technology and Development Center for new materials Engineering&Technology in Universities of guangdong Zhanjiang Normal University Department of Chemistry and institute of Nanochemistry Jinan University

Phosphors of BaLiF3 doped with Eu or/and Ce were solvothermally prepared at 200℃ for 5 d and characterized by means of X-ray powder diffraction （XRD） and environment scanning electron microscopy （ESEM）. The excitation and emission spectra of the rare earth ions doped BaLiF3 were measured by fluorescence spectroscopy and the effects of Ce3＋ ions on the luminescence of Eu〉 ions were in- vestigated. In the co-doped Eu2＋ and Ce3＋ system, the emission intensity of Eu2＋ ion gradually increased with the Ce3＋ concentration increas- ing, and the enhancement of Eu2＋ fluorescence was due to efficient energy transfer from Ce3＋ to Eu2＋ in the host.

关键词： BaLiF3 rare earths optical properties solvothermal synthesis

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An integrated machine learning model for accurate and robust prediction of superconducting critical temperature

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Journal of Energy Chemistry 2023年第3期78卷 232-239,I0007页

作者： Jingzi Zhang Ke Zhang Shaomeng Xu Yi Li Chengquan Zhong Mengkun Zhao Hua-Jun Qiu Mingyang Qin X.-D.Xiang Kailong Hu Xi Lin School of materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055GuangdongChina Blockchain Development and Research institute Harbin Institute of TechnologyShenzhen 518055GuangdongChina State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001HeilongjiangChina School of materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Department of materials Science and Engineering&Department of Physics Southern University of Science and TechnologyShenzhen 518055GuangdongChina

Discovering new superconductors via traditional trial-and-error experimental approaches is apparently a time-consuming process,and the correlations between the critical temperature(Tc) and material features are still *** rise of machine learning(ML) technology provides new opportunities to speed up inefficient exploration processes,and could potentially uncover new hints on the unclear *** this work,we utilize open-source materials data,ML models,and data mining methods to explore the correlation between the chemical features and Tcvalues of superconducting *** further improve the prediction accuracy,a new model is created by integrating three basic algorithms,showing an enhanced accuracy with the coefficient of determination(R2) score of 95.9 % and root mean square error(RMSE) of 6.3 *** average marginal contributions of material features towards Tcvalues are estimated to determine the importance of various features during prediction *** results suggest that the range thermal conductivity plays a critical role in Tcprediction among all element ***,the integrated ML model is utilized to screen out potential twenty superconducting materials with Tcvalues beyond 50.0 *** study provides insights towards Tcprediction to accelerate the exploration of potential high-Tcsuperconductors.

关键词： Superconductors Integrated machine learning Superconducting critical temperature

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