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Utilizing Noncovalent Interactions to Lock and Facilitate Bond Rotation Enables Wide-Range Modulation of the Thermal Isomerization Dynamics of Photoswitches

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CCS Chemistry 2025年第3期7卷 786-797页

作者： Xin-Lin Cao Jia-Lin Yao Zhen-Nan Shen Zhi Li Bo Qiao School of Physical Science&Technology ShanghaiTech UniversityShanghai 201210

The wide application of photoswitches requires control over their isomerization *** noncovalent interactions is a promising strategy as it offers active regulation ***,this control strategy has not yet been explored in-depth to reach its full *** this work,we demonstrate that by directing noncovalent interactions to the central rotating bond of indigo-based photoswitches,their thermal relaxation dynamics were altered in two opposite directions(either slowed down or sped up)allowing for modulating the relaxation half-lives across four orders of *** importantly,our work established two distinct and orthogonal working mechanisms of noncovalent control over isomerization:(1)Thermodynamic stabilization of photoisomers;and(2)Facilitating an alternative reaction pathway through Brønsted/Lewis acid *** two-directional modulation(resembling agonists and inverse agonists in biological systems)via two orthogonal working mechanisms will enable more delicate manipulation of photoswitches for advanced applications.

关键词： photoswitch noncovalent interaction isomerization dynamics thermal relaxation

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An Innovative Approach to Multi-Objective Infrared Temperature Measurement for Electrical Power Equipment Using K-Means 8

An Innovative Approach to Multi-Objective Infrared Temperatu...

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8th International Conference on Control, Robotics and Cybernetics, CRC 2023

作者： Wang, Heye Shang, Xiongjun Xiong, Qi Liang, Jiahao Huang, Yangyang Changsha University of Science&Technology School of Physical and Electronic Sciences Changsha China Changsha University of Science&Technology School of Mathematics and Statistics Changsha China

ISBN: (纸本)9798350330588

Infrared temperature measurement is a widely used non-contact measurement method in power system, which can accurately measure the temperature of power equipment, find the temperature anomaly of equipment in time, and then judge the operation status of equipment. The local heating of power equipment mainly includes the heating caused by the unfastened connection of the transformer bushing, the heating caused by the poor crimmage of the voltage connector of the transmission line, and the heating caused by the unfastened external connection of the current transformer. For the infrared image taken, there are often problems such as complex background, inaccurate target recognition, and fuzzy temperature recognition. Therefore, we optimize the yolov5 multi-Target detection and temperature measurement method. Multi-modal data fusion is constructed by RGB image and infrared image to improve the robustness of the model and strengthen the target fine detection. In the temperature measurement scheme, the K-means algorithm is used to cluster the infrared image of the electrical equipment, and the temperature information contained in each tiny area in the target is displayed, which is convenient to find the temperature hidden danger. The comparison results show that the method has achieved a better temperature diagnosis effect. © 2024 IEEE.

关键词： Object detection

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On the monolayer dispersion behavior of Co_(3)O_(4)on HZSM-5 support:designing applicable catalysts for selective catalytic reduction of nitrogen oxides by ammonia

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Frontiers of Chemical science and Engineering 2023年第11期17卷 1741-1754页

作者： Yufeng Yang Lihong Zhang Tao Song Yixing Huang Xianglan Xu Junwei Xu Xiuzhong Fang Qing Wang Haiming Liu Xiang Wang Key Laboratory of Jiangxi Province for Environment and Energy Catalysis School of Chemistry and Chemical EngineeringNanchang UniversityNanchang 330031China Shanghai Tech University School of Physical Science&TechnologyShanghai 201210China

Based on monolayer dispersion theory,Co_(3)O_(4)/ZSM-5 catalysts with different loadings have been prepared for selective catalytic reduction of nitrogen oxides by ***_(3)O_(4)can spontaneously disperse on HZSM-5 support with a monolayer dispersion threshold of 0.061 mmol 100 m^(-2),equaling to a weight percentage around 4.5%.It has been revealed that the quantities of surface active oxygen(O_(2)^(-))and acid sites are crucial for the reaction,which can adsorb and activate NO_(x)and NH_(3)reactants *** the monolayer dispersion threshold,Co_(3)O_(4)is finely dispersed as sub-monolayers or monolayers and in an amorphous state,which is favorable to generate the two kinds of active sites,hence promoting the performance of ammonia selective catalytic reduction of nitrogen ***,the formation of crystalline Co_(3)O_(4)above the capacity is harmful to the reaction performance.4%Co_(3)O_(4)/ZSM-5,the catalyst close to the monolayer dispersion capacity,possesses the most abundant active O_(2)^(-)species and acidic sites,thereby demonstrating the best reaction performance in all the *** is proposed the optimal Co_(3)O_(4)/ZSM-5 catalyst can be prepared by loading the capacity amount of Co_(3)O_(4)onto HZSM-5 support.

关键词： Co_(3)O_(4)/ZSM-5 NO_(x)-SCR by NH_(3) monolayer dispersion threshold effect surface acid sites surface active O_(2)^(-)anions

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The centrosymmetric to non-centrosymmetric transformation induced by alkaline-earth cations producing infrared nonlinear optical AeMn_(6)Ga_(6)S_(16)(Ae=Ca,Sr)

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science China Chemistry 2024年第9期67卷 2941-2948页

作者： Yang-Ping Zhang Shao-Min Pei Wen-Fa Chen Bin-Wen Liu Xiao-Ming Jiang Guo-Cong Guo State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China School of Physical Science and Technology Shanghai Tech UniversityShanghai 201210China

Non-centrosymmetric(NCS)structure is an indispensable prerequisite for second-order nonlinear optical(NLO)***,the mainstream approach for designing new NCS structures still relies on chemical substitution,necessitating an urgent infusion of fresh *** this work,two isomorphic sulfides AeMn_(6)Ga_(6)S_(16)(Ae=Ca,1;Sr,2)are afforded by modifying the skeleton of centrosymmetric(CS)Mn_(2)Ga_(2)S_(5) via introducing strong electropositive alkaline-earth ***,the incorporation of Ca^(2+)/Sr^(2+)cations allows the elementary[MnGaS_(9)]_(∞)chains to reconfigure into bumpy[MnS_(6)]-[GaS_(4)]layers in a new engagement manner,thus enabling the conversion from CS to NCS *** modifications cause not only strong second-harmonic generation(SHG)responses(~1.5×benchmark AgGaS_(2)@1,700 nm),but also significantly feasible bandgaps(2.60-2.64 e V)compared to the sulfide Mn_(2)Ga_(2)S_(5)(1.36 e V),which ultimately facilitate ultrahigh laser-induced damage thresholds(4.4-6.6×AgGaS_(2)@1,064 nm for compounds 1 and 2).The present study offers an ingenious approach for the transformation of CS to NCS structure.

关键词： second-harmonic generation non-centrosymmetrical structure NLO functional motif solid-state method

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Breaking the concentration quenching limit of lanthanide emitter through multi-coupling of confined quasi-0D & 2D energy migration

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science China Chemistry 2025年第4期68卷 1372-1382页

作者： Yuanchao Lei Shanshan Zhou Jianxi Ke Licheng Yu Youchao Wei Yongsheng Liu Maochun Hong State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China School of Physical Science and Technology.Shanghai Tech University Shanghai 201210China

The widespread applications of lanthanide-doped materials have fuelled a growing demand for precise control over the luminescence characteristics of these ***,the limitation imposed by concentration quenching remains a major obstacle in achieving efficient luminescence from lanthanide-doped ***,a novel strategy utilizing Sc_(2)O_(3):Ln^(3+) microflowers to enable confined energy migration in both microscopic quasi-zero-dimensional(0D)and mesoscopic twodimensional(2D)multi-coupling systems is proposed to overcome the concentration quenching limit of lanthanide emitters and achieve a remarkable doping amount of 48.14%on a single particle without resorting to complex core/multishell *** studies reveal that the multi-confinement structure effectively restricts the range of energy migration and significantly reduces excitation energy migration to *** on these highly doped Sc_(2)O_(3) microflowers,full spectrum and power-dependent tunable multi-color lanthanide emission in a single particle is successfully ***,the 2D-encoded patterns derived from these microflowers hold great promise for anti-counterfeiting *** findings emphasize the multi-coupling of confined quasi-0D&2D energy migration within a well-designed structure,providing valuable insights into concentration quenching *** also opens up new opportunities for multi-level anti-counterfeiting systems and information security.

关键词： lanthanides concentration quenching multiple confinement Sc_(2)O_(3) color-tunable

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Study on the Mechanism of High Power Microwave Radiation Effect of GaN LNA 10

Study on the Mechanism of High Power Microwave Radiation Eff...

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10th IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, MAPE 2024

作者： Liu, Min Cai, Zongqi Bian, Li'an Lv, Anru Tang, Houlu Chen, Yiqiang Lu, Guoguang School of Physical and Electronic Science Changsha University of Science&Technology CEPREI Guangzhou China The Science and Technology on Reliability Physics and Application of Electronic Component Laboratory CEPREI Guangzhou China

ISBN: (纸本)9798331533922

In this paper, a high-power microwave resonant cavity is designed and used to build a high-power microwave radiation experimental system, and the high-power microwave radiation interference effect of GaN low-noise amplifier is studied. Unlike lots of previous papers whose research focuses on the high-power microwave injection damage effects of RF front-end devices, this paper proposes a simple high-power microwave radiation testing system, which can generate a high-power microwave radiation field of 100kV/m under continuous wave and pulse working conditions. The gain of GaN LNA decreases with the increase of high-power microwave radiation field strength, mainly due to the vertical high-power microwave radiation equal to the injection power to the input port of LNA, which causes saturation of the LNA, and reduces its linearity and amplification ability for weak signals. This experimental system greatly reduces the high cost, difficulty, and safety requirements of traditional high-power microwave effect systems. It has certain practical value for conducting high-power microwave radiation experiments on digital circuits such as MCU and FPGA, as well as analog circuit components such as limiters and amplifiers. © 2024 IEEE.

关键词： Low noise amplifiers

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Giant piezotronic effect in ferroelectric field effect transistor

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Nano Research 2024年第9期17卷 8465-8471页

作者： Haiming Zhang Mengshuang Chi Shidai Tian Tian Liang Jitao Liu Xiang Zhang Lingyu Wan Zhong Lin Wang Junyi Zhai Center on Nanoenergy Research School of Physical Science&TechnologyGuangxi UniversityNanning 530004China Beijing Key Laboratory of Micro-Nano Energy and Sensor Center for High-Entropy Energy and SystemsBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China School of Nanoscience and Engineering University of Chinese Academy of ScienceBeijing 100049China School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 610054China Georgia Institute of Technology AtlantaGA 30332USA

The piezotronics effect utilizes a piezopotential to modulate and control current in *** materials,as a type of piezoelectric materials,possess piezoelectric coefficients that are significantly larger than those found in conventional piezoelectric ***,we propose a strain modulated ferroelectric field-effect transistor(St-FeFET)utilizing external strain instead of gate voltage to achieve ferroelectric modulation,which eliminates the need for gate *** applying a very small strain(0.01%),the St-FeFET can achieve a maximum on-off current ratio of 1250%and realizes a gauge factor(GF)of 1.19×10^(6),which is much higher than that of conventional strain *** work proposes a new method for realizing highly sensitive strain sensors and presents innovative approaches to the operation methods of ferroelectric field-effect transistors as well as potential applications for coupling of strain sensors and various devices across different fields.

关键词： ferroelectric field-effect transistors piezotronics [Pb(Mg_(1/3)Nb_(2/3))O_(3)]_((1-x)^(-))[PbTiO_(3)]_(x)(PMN-PT) strain sensors

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Enhancing thermoelectric performance in P-type Mg_(3)Sb_(2)-based Zintls through optimization of band gap structure and nanostructuring

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Journal of Materials science & technology 2024年第3期170卷 25-32页

作者： Yi-bo Zhang Ji-Sheng Liang Chengyan Liu Qi Zhou Zhe Xu Hong-bo Chen Fu-cong Li Ying Peng Lei Miao Guangxi Key Laboratory of Information Material Engineering Research Center of Electronic Information Materials and DevicesMinistry of EducationSchool of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China Guangxi Key Laboratory for Relativity Astrophysics Center on Nanoenergy ResearchGuangxi Key Laboratory of Processing for Nonferrous Metal and Featured MaterialsSchool of Physical Science&TechnologyGuangxi UniversityNanning 530004China Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic TechnologySchool of Information and CommunicationGuilin 541004China

P-type Mg_(3)Sb_(2)-based Zintls have attracted considerable interest in the thermoelectric(TE)field due to their environmental friendliness and low ***,compared to their n-type counterparts,they show relatively low TE performance,limiting their application in TE *** this work,we simultaneously introduce Bi alloying at Sb sites and Ag doping at Mg sites into the Mg_(3)Sb_(2)to coopera-tively optimize the electrical and thermal properties for the first time,acquiring the highest ZT value of∼0.85 at 723 K and a high average ZT of 0.39 in the temperature range of 323-723 K in sample Mg_(2.94)Ag_(0.06)Sb_(1.9)Bi_(0.1).The first-principle calculations show that the codoping of Ag and Bi can shift the Fermi level into the valence band and narrow the band gap,resulting in the increased carrier concentration from 3.50×10^(17)cm^(-3)in the reference Mg 3 Sb 0.9 Bi 0.1 to∼7.88×10^(19)cm^(-3)in sample Mg 2.94 Ag 0.06 Sb 0.9 Bi *** a result,a remarkable power factor of∼778.9μW m^(-1)K^(-2)at 723 K is achieved in sample Mg 2.94 Ag 0.06 Sb 0.9 Bi ***,a low lattice thermal conductivity of∼0.48 W m^(-1)K^(-1)at 723 K is also obtained with the help of phonon scattering at the distorted lattice,point defects,and nano-precipitates in sample Mg 2.94 Ag 0.06 Sb 0.9 Bi *** synergistic effect of using the multi-element co-doping/-alloying to optimize electrical properties in Mg_(3)Sb_(2)holds promise for further improving the TE performance of Zintl phase materials or even others.

关键词： Thermoelectric materials Band engineering Nanostructuring P-type Mg_(3)Sb_(2) Ag and Bi Co-doping

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Regulating Oxygen Vacancy Defects in Heterogeneous NiO-CeO_(2)−δ Hollow Multi-shelled Structure for Boosting Oxygen Evolution Reaction

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Chemical Research in Chinese Universities 2024年第3期40卷 475-483页

作者： WANG Huan GONG Guannan SUN Guohua QI Jian YU Ranbo WANG Dan Hebei Key Laboratory of Flexible Functionals Materials School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuang 050000P.R.China Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science&Technology BejingBeijing 100083P.R.China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China

CeO_(2) with excellent oxygen storage-exchange capacity and NiO with excellent surface activity were used to construct a heterogeneous NiO-CeO_(2)−δhollow multi-shelled structure(HoMS)by spray *** turned out that as the proportion of CeO_(2) increases,the overpotential and Tafel slope of NiO-CeO_(2)−δHoMSs first decreased and then *** is mainly because the construction of the NiO-CeO_(2)−δHoMSs not only increases the specific surface area,but also introduces oxygen vacancy defects,thus improving the interface charge transfer capability of the materials and further improving the oxygen evolution reaction(OER)***,the increase of the calcination temperature will induce the decay of the OER performance of NiO-CeO_(2)−δHoMSs,which is mainly due to the decrease of the specific surface area,the reduction of oxygen vacancy defects,and the weakening of interface charge transfer ***,a series of heterogeneous composite HoMSs,such as Ni/Co,Mo/Ni,Al/Ni and Fe/Ni oxides was successfully constructed by spray drying,which enriched the diversity of HoMSs.

关键词： Heterogeneous composite structure Hollow multishelled structure Oxygen vacancy defect Oxygen evolution reaction

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Achieving Intrinsic Dual-Band Excitonic Luminescence from a Single Three-Dimensional Perovskite Nanoparticle Through Ni^(2+)-Mediated Halide Anion Exchange

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CCS Chemistry 2024年第2期6卷 415-426页

作者： Licheng Yu Youchao Wei Yuanchao Lei Caiping Liu Yongsheng Liu Maochun Hong State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian 350002 Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China FuzhouFujian 350108 School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210

Rapid halide anion exchange easily occurring in metal-halide perovskite nanoparticles(NPs)makes it nearly impossible to create a single three-dimensional(3D)CsPbX_(3)(X=Cl,Br,I)NP that simultaneously comprises two separate perovskite *** circumvent this problem,we first propose a Ni^(2+)-mediated halide anion-exchange strategy in zero-dimensional(0D)Ni^(2+)-doped Cs_(4)PbBr_(6)(Cs_(4)PbBr_(6):Ni)perovskites to achieve ultra-stable 3D CsPbX_(3)NPs with two coexisting different perovskite individuals of CsPbCl_(3)and/or CsPbBr_(3).By combining the experimental results with first-principles calculations,we confirm that the completely isolated[PbBr_(6)]4−octahedra in 0D Cs_(4)PbBr_(6):Ni NPs can restrict rapid halide anion exchange and the anion diffusion preferentially proceeds in the proximity of substitutional NiPb centers,namely[NiBr_(6)]4−octahedra in a meta-stable state,rather than in the 0D Cs_(4)PbBr_(6)and residual 3D CsPbBr_(3)regions,thereby delivering intrinsic dual-band excitonic luminescence from a single 3D CsPbX_(3)NP with a more stable and efficient CsPbCl_(3)component as compared to its counterparts synthesized using conventional *** new insights regarding the precise control of halide anion exchange enable the preparation of a new type of high-efficiency perovskite materials with suppressed anion interdiffusion for prospective optoelectronic devices.

关键词： excitonic luminescence three-dimensional CsPbX_(3) perovskite nanoparticle halide anion exchange impurity doping

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