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Optimizing electronic structure of Mo_(2.TiC_(2.T_(x) MXene through Nb doping for enhanced electrochemical performance

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Nano Research 2024年第8期17卷 7174-7181页

作者： Jingyuan Zhao Wenzheng Yan Zhaoxi Liu Xiaobin Liu Yapeng Tian Xinwei Cui Henan Institute of Advanced Technology College of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450003China college of physics and {2. information Engineering Guilin University of TechnologyGuilin 514004China

MXene is a promising electrode material for both high volumetric capacitance and high-rate performance in ***,the current study has mainly focused on the monometallic element Ti_(3)C_(2.T_(x) MXene until now,while the bimetallic and multimetallic MXene have received comparatively less *** this work,we demonstrate that the electronic structure of the Mo_(2.TiC_(2.T_(x) MXene could be regulated by fine-tuning the content of doped Nb *** enhanced electron cloud density of surface–O termination and the electron spin of the Mo atoms in the Mo_(2.TiC_(2.T_(x) MXene,leads to the boost of electric double-layer capacitor(EDLC)and improvement of *** a consequence,the electrochemical performance of Nb-doped Mo_(2.TiC_(2.T_(x) MXene(Nb-0.3-MXene)demonstrates a capacitance of 398 F·cm^(−3),roughly doubling that of the pristine Mo_(2.TiC_(2.T_(x) MXene electrode at 197 F·cm^(−3) in the 3 M H_(2.SO_(4) *** the same time,the Nb-0.3-MXene could even maintain a capacitance of 82.75% at 2.0 mV·s−1,with high cyclic stability for 19,000 cycles at 10 A·g−***,Nb-0.3-MXene-based hybrid supercapacitors deliver a remarkable volumetric energy density of 48.1 W·h·L^(−1)at 2.0.7 W·L^(−1),and 34.4 W·h·L^(−1)at a high power density of 82.6 kW·L^(−1).There exists a balance between the volumetric capacitance and rate performance with different ratios of Nb atoms in the Nb-doped MXene due to the strong interaction between the Nb-doped MXene and the intercalated ***,optimizing the electronic structure of MXene through heteroatom doping is of great potential for enhanced supercapacitor performance.

关键词： niobium doping electronic structure Mo_(2.TiC_(2.T_(x)MXene electron spin rate performance volumetric capacitance

Tunable hexagonal boron nitride topological optical delay line in the visible region

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Chinese Optics Letters 2024年第5期22卷 124-130页

作者：费宏明武敏林瀚杨毅彪肖连团 college of physics Taiyuan University of TechnologyTaiyuan 030024China college of information Engineering Shanxi Vocational University of Engineering Science and TechnologyJinzhong 030619China college of science RMIT UniversityMelbourneVictoria 3000Australia college of electronic {2. and Optical Engineering Taiyuan University of TechnologyTaiyuan 030024China

Tunability,ultracompact design,high group index,low loss,and broad bandwidth are desired properties for integrated optical delay lines(ODLs).However,those properties are challenging to achieve simultaneously in the visible *** paper proposes a tunable hexagonal boron nitride topological optical delay line(ODL)in the visible region based on valley photonic *** topological edge state from the beard-type boundary allows the achievement of an ultralow group velocity close to zero,which results in a large group index of 62. at 645 ***,we demonstrate tuning of the slow-light wavelength and optical delay times with electrically tunable liquid crystals by applying external *** device has an ultracompact size of 5μm×2.7μm with an optical delay distance of 2.a(a is the lattice constant)and a delay time of 12.*** design can provide a new possibility for designing ODLs working in the visible region for optical communication and quantum computing systems.

关键词： valley photonic crystal topological edge states optical delay lines

Enhancing thermoelectric performance of p-type SnTe through manipulating energy band structures and decreasing electronic thermal conductivity

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Rare Metals 2024年第7期43卷 3232-3241页

作者： Xin Qian Hao-Ran Guo Jia-Xin Lyu Bang-Fu Ding Xing-Yuan San Xiao Zhang Jiang-Long Wang Shu-Fang Wang Hebei Key Lab of Optic-electronic information and Materials College of Physics Science and TechnologyHebei UniversityBaoding 071002China college of Electron and information Engineering Hebei UniversityBaoding 071002China Research Institute for Frontier science Beihang UniversityBeijing100191China

SnTe has received considerable attention as an environmentally friendly alternative to the representative thermoelectric material of ***,excessive hole carrier concentration in SnTe results in an extremely low Seebeck coefficient and high thermal conductivity,which makes it exhibit relatively inferior thermoelectric *** this work,the thermoelectric performance of p-type SnTe is enhanced through regulating its energy band structures and reducing its electronic thermal conductivity by combining Bi doping with CdSe ***,the carrier concentration of SnTe is successfully suppressed via Bi doping,which significantly decreases the electronic thermal ***,the convergence and flattening of the valence bands by alloying CdSe effectively improves the effective mass of SnTe while restraining its carrier ***,a maximum figure of merit(ZT) of~ 0.87 at 82. K and an average ZT of~ 0.51 at 300-82. K have been achieved in Sn_(0.96)Bi_(0.04)Te-5%*** results indicate that decreasing the electronic thermal conductivity is an effective means of improving the performance of thermoelectric materials with a high carrier concentration.

关键词： Thermoelectric materials SnTe Energy band structure electronic thermal conductivity ZT value

Thermogalvanic hydrogel-based e-skin for self-powered on-body dual-modal temperature and strain sensing

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Microsystems & Nanoengineering 2024年第2期10卷 293-302页

作者： Zhaosu Wang Ning Li Xinru Yang Zhiyi Zhang Hulin Zhang Xiaojing Cui college of electronic {2. and Optical Engineering Taiyuan University of TechnologyTaiyuan030024China college of Materials science and Engineering Taiyuan University of TechnologyTaiyuan030024China School of physics and information Engineering Shanxi Normal UniversityTaiyuan030031China

Sensing of both temperature and strain is crucial for various diagnostic and therapeutic ***,we present a novel hydrogel-based electronic skin(e-skin)capable of dual-mode sensing of temperature and *** thermocouple ion selected for this study is the iodine/triiodide(I−/I3−)redox couple,which is a common component in everyday *** leveraging the thermoelectric conversion in conjunction with the inherent piezoresistive effect of a gel electrolyte,self-powered sensing is achieved by utilizing the temperature difference between the human body and the external *** composite hydrogels synthesized from polyvinyl alcohol(PVA)monomers using a simple freeze‒thaw method exhibit remarkable flexibility,extensibility,and adaptability to human *** incorporation of zwitterions further augments the resistance of the hydrogel to dehydration and low temperatures,allowing maintenance of more than 90%of its weight after 48 h in the *** its robust thermal current response,the hydrogel was encapsulated and then integrated onto various areas of the human body,including the cheeks,fingers,and ***,the detection of the head-down state and the monitoring of foot movements demonstrate the promising application of the hydrogel in supervising the neck posture of sedentary office workers and the activity *** successful demonstration of self-powered on-body temperature and strain sensing opens up new possibilities for wearable intelligent electronics and robotics.

关键词： hydrogel modal utilizing

information-Theoretic Limits on Compression of Semantic information

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China Communications 2024年第7期21卷 1-16页

作者： Tang Jiancheng Yang Qianqian Zhang Zhaoyang college of information {2. and electronic Engineering Zhejiang UniversityHangzhou 310007China

As conventional communication systems based on classic information theory have closely approached Shannon capacity,semantic communication is emerging as a key enabling technology for the further improvement of communication ***,it is still unsettled on how to represent semantic information and characterise the theoretical limits of semantic-oriented compression and *** this paper,we consider a semantic source which is characterised by a set of correlated random variables whose joint probabilistic distribution can be described by a Bayesian *** give the information-theoretic limit on the lossless compression of the semantic source and introduce a low complexity encoding method by exploiting the conditional *** further characterise the limits on lossy compression of the semantic source and the upper and lower bounds of the rate-distortion *** also investigate the lossy compression of the semantic source with two-sided information at the encoder and decoder,and obtain the corresponding rate distortion *** prove that the optimal code of the semantic source is the combination of the optimal codes of each conditional independent set given the side information.

关键词： rate distortion semantic communication semantic compression

A statistical study on the correlation between sporadic Ca+ layer and Es in Beijing（40.5°N, 116°E）

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Earth and Planetary physics 2024年第5期8卷 753-761页

作者： YuChang Xun ZhiShan Chen LiFang Du HaoRan Zheng Jing Jiao ZeLong Wang ShaoHua Gong GuoTao Yang college of physics College of Electronic Information and Optical Engineering Taiyuan University of Technology State Key Laboratory of Space Weather National Space Science Center Chinese Academy of Sciences School of science Jiangsu University of Science and Technology School of physics and electronics Engineering Hainan Normal University

From April 2.2. to June 2.2., a Ca+lidar with dual-wavelength and narrow-band emitting lasers utilizing all-solid-state technology was employed to conduct observations in Beijing（40.41°N, 116.01°E） for a total duration of 1797.79 hours over 2.0 nights. A total of 2.6 sporadic Ca+layers were observed, with heights ranging from 88 to 12. km and densities varying from 5.33 to 2.00 cm-3. We simultaneously observed the ionosonde, located 2. km from the lidar, and found a correlation of 61.89% between the sporadic Ca+ layer and the sporadic E layer. When the sporadic Ca+layer has a downward phase trend, there is a correlation of 76.84%. By excluding the influence of ionosonde sensitivity, we focus only on calcium ions that have a density exceeding 140 cm-3, which exhibit a correlation of82.2.%. Above 100 km, the correlation significantly increases, reaching approximately 90%. Furthermore, the correlation between the sporadic Ca+ layer and the sporadic E layer is particularly noticeable during the summer season, reaching around 90%. This phenomenon can be attributed to the variations in metal ions that occur during different seasons.

关键词： the Meridian Project lidar sporadic Ca+ layer sporadic E layer

Acoustic Bilayer Gradient Metasurfaces for Perfect and Asymmetric Beam Splitting

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Chinese physics Letters 2024年第1期41卷 39-50页

作者：权家琪孙宝印伏洋洋高雷徐亚东 Institute of Theoretical and Applied physics School of Physical Science and TechnologySoochow UniversitySuzhou 215006China college of physics Nanjing University of Aeronautics and Astronautics&Key Laboratory of Aerospace Information Materials and Physics(NUAA)MIITNanjing 211106China School of Optical and electronic information Suzhou City UniversitySuzhou 215104China

We experimentally and theoretically present a paradigm for the accurate bilayer design of gradient metasurfaces for wave beam manipulation,producing an extremely asymmetric splitting effect by simply tailoring the interlayer *** concept arises from anomalous diffraction in phase gradient metasurfaces and the precise combination of the phase gradient in bilayer *** by different diffraction routes in momentum space for incident beams from opposite directions,extremely asymmetric acoustic beam splitting can be generated in a robust way,as demonstrated in experiments through a designed bilayer *** work provides a novel approach and feasible platform for designing tunable devices to control wave propagation.

关键词： surfaces splitting asymmetric

Imaging through scattering layers using a near-infrared low-spatial-coherence fiber random laser

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Chinese physics B 2024年第10期33卷 226-232页

作者： Anda Shi Zeyu Wang Chenxi Duan Zhao Wang Weili Zhang School of information and Communication Engineering University of Electronic Science&Technology of ChinaChengdu 611731China Yingcai Honors college University of Electronic Science&Technology of ChinaChengdu 611731China

Optical memory effect-based speckle-correlated technology has been developed for reconstructing hidden objectsfrom disordered speckle patterns,achieving imaging through scattering ***,the lighting efficiency and fieldof view of existing speckle-correlated imaging systems are ***,a near-infrared low spatial coherence fiberrandom laser illumination method is proposed to address the above *** the utilization of random Rayleighscattering within dispersion-shifted fibers to provide feedback,coupled with stimulated Raman scattering for amplification,a near-infrared fiber random laser exhibiting a high spectral density and extremely low spatial coherence is *** on the designed fiber random laser,speckle-correlated imaging through scattering layers is achieved,with highlighting efficiency and a large imaging field of *** work improves the performance of speckle-correlated imagingand enriches the research on imaging through scattering medium.

关键词： fiber random laser speckle-correlated imaging scattering medium spatial coherence

Bose–Einstein distribution temperature features of quasiparticles around magnetopolaron in Gaussian quantum wells of alkali halogen ions

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Chinese physics B 2024年第9期33卷 521-526页

作者： Xin Zhang Sarengaowa Shuang Han Ran An Xin-Xue Zhang Xin-Ying Ji Hong-Xu Jiang Xin-Jun Ma Pei-Fang Li Yong Sun college of physics and {2. information Inner Mongolia Minzu UniversityTongliao028000China Institute of Condensed Matter physics Inner Mongolia Minzu UniversityTongliao 028000China

We have applied strong coupling unitary transformation method combined with Bose–Einstein statistical law to investigate magnetopolaron energy level temperature effects in halogen ion crystal quantum *** obtained results showed that under magnetic field effect,magnetopolaron quasiparticle was formed through the interaction of electrons and surrounding *** the same time,magnetopolaron was influenced by phonon temperature statistical law and important energy level shifts down and binding energy *** revealed that lattice temperature and magnetic field could easily affect magnetopolaron and the above results could play key roles in exploring thermoelectric conversion and conductivity of crystal materials.

关键词： temperature effect quantum well asymmetric Gaussian potential magnetopolaron