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Active tunable terahertz bandwidth absorber based on single layer graphene

Communications in Theoretical Physics 2023年第4期75卷 106-113页

作者： Wenxin Li Yingting Yi Hua Yang Shubo Cheng Wenxing Yang Huafeng Zhang Zao Yi Yougen Yi Hailiang Li School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhou 434023China College of Physics and Electronics Central South UniversityChangsha 410083China School of Science Lanzhou University of TechnologyLanzhou 730050China Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621010China Key Laboratory of Microelectronic Devices&Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China

In this paper,an active tunable terahertz bandwidth absorber based on single-layer graphene is proposed,which consists of a graphene layer,a photo crystal plate,and a gold *** the Fermi energy(Ef)of graphene is 1.5 eV,the absorber shows high absorption in the range of 3.7 THz–8 THz,and the total absorption rate is 96.8%.By exploring the absorption mechanism of the absorber,the absorber shows excellent physical *** absorber also shows good adjustability by changing the Efof *** means that the absorber exhibits excellent tunability by adjusting the physical parameters and Efof the ***,the absorber is polarization independent and insensitive to the incident *** fine characteristics of the absorber mean that the absorber has superior application value in many fields such as biotechnology and space exploration.

关键词： metamaterials active tunable bandwidth absorber terahertz graphene

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Flexible Hf_(0.5)Zr_(0.5)O_(2)ferroelectric thin films on polyimide with improved ferroelectricity and high flexibility

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Nano Research 2022年第4期15卷 2913-2918页

作者： Yuting Chen Yang Yang Peng Yuan Pengfei Jiang Yuan Wang Yannan Xu Shuxian Lv Yaxin Ding Zhiwei Dang Zhaomeng Gao Tiancheng Gong Yan Wang Qing Luo Key Laboratory of Microelectronic Devices and Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Department of Mathematics and Theories Peng Cheng LaboratoryNo.2Xingke 1st StreetNanshanShenzhen 518000China

Flexible memory devices are promising for information storage and data processing applications in portable,wearable,and smart electronics operating under curved *** this work,we realized high-performance flexible ferroelectric capacitors based on Hf_(0.5)Zr_(0.5)O_(2)(HZO)thin film by depositing a buffer layer of Al_(2)O_(3)on polyimide(PI)substrates using atomic layer deposition(ALD).The flexible ferroelectric HZO films exhibit high remnant polarization(Pr)of 21μC/cm^(2).Furthermore,deterioration of polarization,retention,and endurance performance was not observed even at a bending radius of 2 mm after 5,000 bending *** work marks a critical step in the development of high-performance flexible HfO_(2)-based ferroelectric memories for next-generation wearable electronic devices.

关键词： ferroelectric Hf_(0.5)Zr_(0.5)O_(2)(HZO) Al_(2)O_(3)buffer layer flexible

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Simultaneous integration of Fe clusters and NiFe dual single atoms in nitrogen-doped carbon for oxygen reduction reaction

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Nano Research 2024年第4期17卷 2291-2297页

作者： Jirong Bai Yuebin Lian Yaoyao Deng Mei Xiang Peng Xu Quanfa Zhou Yawen Tang Yaqiong Su Research Center of Secondary Resources and Environment School of Chemical Engineering and MaterialsChangzhou Institute of TechnologyChangzhou 213022China Jiangsu Key Laboratory of New Power Batteries School of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023China School of Chemistry Engineering Research Center of Energy Storage Materials and Devices of Ministry of EducationNational Innovation Platform(Center)for Industry-Education Integration of Energy Storage TechnologyXi’an Jiaotong UniversityXi’an 710049China

Atomically-dispersed iron-based electrocatalysts are promising substitutes for noble metal electrocatalysts because of excellent performance in oxygen reduction reaction(ORR).Rationally modulating the local coordination environment of the Fe site and optimizing the binding energy of oxygen reduction intermediates are effective strategies to optimize ORR ***,we report a new method in which Ni is introduced to construct NiFe dual single atoms and iron nanoclusters loaded on the nitrogen-doped carbon with a highly porous *** design plays a synergistic role of dual single atoms and clusters,optimizes the 3d orbital and Fermi level of Fe,breaks the symmetrical structure of Fe-N_(4),and effectively improves the adsorption/desorption behavior of the oxygen-containing *** tests show FeNCs/NiFeSAs-NC has an excellent intrinsic *** calculations show the oxygen-containing species on the Ni active site will move to the middle of NiFe(bridge site connection)after optimization and that the key step is OH desorption,with a reaction energy of 0.27 *** electron exchange between NiFe-N6 and Fe-cluster is very strong,further indicating the introduction of Ni species and Fe clusters has a regulatory effect on the electronic structure of Fe-N_(4).

关键词： NiFe dual single atoms Fe clusters OH*adsorption energy oxygen reduction reaction

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Fabrication and Performance Research of Silicon Nanosheet Field Effect Transistor Biosensor

Fabrication and Performance Research of Silicon Nanosheet Fi...

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2022 China Semiconductor technology International Conference, CSTIC 2022

作者： Xiong, Enyi Zhang, Zhaohao Zhang, Qingzhu Wei, Shuhua Wei, Qianhui Zhang, Jing Yan, Jiang School of Information Science and Technology North China University of Technology Beijing100144 China Institute of Microelectronics Chinese Academy of Sciences Key Laboratory of Microelectronic Devices and Integration Technology Beijing100029 China State Key Laboratory of Advanced Materials for Smart Sensing Grinm Group Co. Ltd. Beijing100088 China

ISBN: (数字)9781665497589

ISBN: (纸本)9781665497589

Silicon nanowire (SiNW) FET biosensor has made great contributions to chemical and bio-molecular sensing, and is considered to be one of the best candidates for biosensors. However, due to high sensitivity to pH changes of the buffer solution when detecting biomolecules and low binding rate to biomolecules for small area, SiNW FET biosensor still has the problems of high variation and long response time. To solve the problems, In this paper, we investigate the sensing performances of silicon nanosheets (SiNS) FET with different areas, and found that SiNS FET biosensor with large areas can reduce the sensitivity to pH effectively, thus reducing the detection error caused by pH changes and improving sensing accuracy. In addition, by COMSOL simulating, we also found that devices with wide SiNS show higher bonding rate than that of SiNW devices at low analyte concentrations, thereby decreasing the responding time for high-speed detecting. © 2022 IEEE.

关键词： Nanosheets

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F3: An FPGA-based Transformer Fine-tuning Accelerator with Flexible Floating Point Format

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IEEE Journal on Emerging and Selected Topics in Circuits and Systems 2025年

作者： He, Zerong Liu, Jing Jin, Xi Xu, Zhongguang Chinese Academy of Sciences Key Laboratory of Microelectronic Devices and Integration Technology Institute of Microelectronics Beijing100029 China University of Science and Technology of China School of Physical Science Anhui Hefei230022 China University of Science and Technology of China School of Microelectronics Anhui Hefei230026 China

Transformers have demonstrated remarkable success across various deep learning tasks. However, their inference and fine-tuning require substantial computation and memory resources, posing challenges for existing hardware platforms, particularly resource-constrained edge devices. To address these limitations, we propose F3, an FPGA-based accelerator for transformer fine-tuning. To reduce computation and memory overhead, this paper proposes a flexible floating point (FFP) format which consumes fewer resources than traditional floating-point formats of the same bitwidth. We adapt low-rank adaptation to FFP format and propose a fine-tuning strategy named LR-FFP which reduces the number of trainable parameters without compromising fine-tuning accuracy. At the hardware level, we design specialized processing elements (PEs) for the FFP format. The PE maximizes the utilization of DSP resources, enabling a single DSP to perform two multiply-accumulate operations per cycle. The PEs are organized into a systolic array (SA) to efficiently handle general matrix multiplication during fine-tuning. Through theoretical analysis and experimental evaluation, we determine the optimal dataflow and SA parameters to balance performance and resource consumption. We implement the architecture on the Xilinx VCU128 FPGA platform and F3 achieves a performance of 8.2 TFlops at 250 MHz. Compared with CPU and GPU implementations, F3 achieves speedups of 15.22× and 3.44×, respectively, and energy efficiency improvements of 70.52× and 9.44×. © 2011 IEEE.

关键词： Systolic arrays

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Flash-based in-memory computing for stochastic computing in image edge detection

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Journal of Semiconductors 2023年第5期44卷 145-149页

作者： Zhaohui Sun Yang Feng Peng Guo Zheng Dong Junyu Zhang Jing Liu Xuepeng Zhan Jixuan Wu Jiezhi Chen School of Information Science and Engineering(ISE) Shandong UniversityQingdao 266000China Shandong Sinochip Semiconductors Co.Ltd Jinan 250101China Neumem Co. LtdHefei 230088China Key Laboratory of Microelectronic Devices and Integrated Technology Institute of Microelectronics of Chinese Academy of SciencesBeijing 100029China

The“memory wall”of traditional von Neumann computing systems severely restricts the efficiency of data-intensive task execution,while in-memory computing(IMC)architecture is a promising approach to breaking the *** variations and instability in ultra-scaled memory cells seriously degrade the calculation accuracy in IMC architectures,stochastic computing(SC)can compensate for these shortcomings due to its low sensitivity to cell ***,massive parallel computing can be processed to improve the speed and efficiency of the *** this paper,by designing logic functions in NOR flash arrays,SC in IMC for the image edge detection is realized,demonstrating ultra-low computational complexity and power consumption(25.5 fJ/pixel at 2-bit sequence length).More impressively,the noise immunity is 6 times higher than that of the traditional binary method,showing good tolerances to cell variation and reliability degradation when implementing massive parallel computation in the array.

关键词： in-memory computing stochastic computing NOR flash memory image edge detection

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A seaweed-inspired separator for high performance Zn metal batteries:Boosting kinetics and confining side-reactions

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Journal of Energy Chemistry 2025年第2期101卷 191-200,I0005页

作者： Qianzhi Gou Horan Luo Long Qu Feilin Yu Kaixin Wang Sida Zhang Ziga Luogu Ben Zhang Yujie Zheng Bingye Song John Wang Meng Li National Innovation Center for Industry-Education Integration of Energy Storage MOE Key Laboratory of Low-grade Energy Utilization Technologies and SystemsCQU-NUS Renewable Energy Materials&Devices Joint LaboratoryCollege of Energy&Power EngineeringChongqing UniversityChongqing 400044China Schoolof Building Services Science and Engineering Xi'an University of Architecture and TechnologyXi'an 710055ShaanxiChina School of Chemistry and Chemical Engineering Chongqing University of Science and TechnologyChongqing 401331China Southwest Technology and Engineering Research Institute Chongqing 400039China National University of Singapore(Chongqing)Research Institute Chongqing 401123China

Uncontrolled dendrite growth,sluggish reaction kinetics,and drastic side reactions on the anodeelectrolyte interface are the main obstacles that restrict the application prospect of aqueous zinc-ion *** glass fiber(GF)separator with chemical inertness is almost ineffective in restricting these ***,inspired by the ionic enrichment behavior of seaweed plants,a facile biomass species,anionic sodium alginate(SA),is purposely decorated on the commercial GF separator to tackle these issues towards Zn *** from the abundant zincophilic functional groups and superior mechanical strength properties,the as-obtained SA@GF separator could act as ion pump to boost the Zn^(2+)transference number(0.68),reduce the de-solvation energy barrier of hydrated Zn^(2+),and eliminate the undesired concentration polarization effect,which are verified by experimental tests,theoretical calculations,and finite element simulation,*** on these efficient modulation mechanisms,the SA@GF separator can synchronously achieve well-aligned Zn deposition and the suppression of parasitic ***,the Zn‖Zn coin cell integrated with SA@GF separator could yield a prolonged calendar lifespan over 1230 h(1 mA cm^(-2)and 1 mAh cm^(-2)),exhibiting favorable competitiveness with previously reported separator modification ***,the Zn-MnO_(2)full and pouch cell assembled with the SA@GF separator also delivered superior cycling stability and rate performance,further verifying its practical application *** work provides a new design philosophy to stabilize the Zn anode from the aspect of separator.

关键词： Aqueous zinc-ionbatteries Separator modification Sodium alginate Dendrite-free Interfacial reaction kinetics

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Modulating structural oxygen/crystallinity enables ambient cascade photo-upgrading of biomass saccharides to lactic acid

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Carbon Energy 2025年第3期7卷 91-109页

作者： Jinshu Huang Yan Ding Jie Li Zhao Hu Shunmugavel Saravanamurugan Junqi Wang Yaqiong Su Song Yang Hu Li State Key Laboratory of Green Pesticide Key Laboratory of Green Pesticide&Agricultural BioengineeringMinistry of EducationState-Local Joint Laboratory for Comprehensive Utilization of BiomassCenter for R&D of Fine ChemicalsGuizhou UniversityGuiyangGuizhouChina Laboratory of Bioproduct Chemistry Centre of Innovative and Applied Bioprocessing(CIAB)MohaliPunjabIndia Department of Earth and Environmental Science School of Human Settlements and Civil EngineeringXi'an Jiaotong UniversityXi'anShaanxiChina School of Chemistry Engineering Research Center of Energy Storage Materials and Devices of Ministry of EducationNational Innovation Platform(Center)for Industry-Education Integration of Energy Storage TechnologyXi'an Jiaotong UniversityXi'anChina

Photocatalytic transformation of biomass into biofuels and value-added chemicals is of great significance for carbon ***-free carbon nitride has extensive applications but with almost no absorption and utilization of near-infrared light,accounting for 50%of ***,a molten salt-assisted in-plane“stitching”and interlayer“cutting”protocol is developed for constructing a highly crystalline carbon nitride catalyst containing structural oxygen(HC-CN).HC-CN is highly efficient for the photothermal cascade transformation of biomass-derived glucose into lactic acid(LA)with an unprecedented yield(94.3%)at 25°C under full-spectrum light irradiation within 50 min,which is also applicable to quantitatively photo-upgrading various *** calculations expound that the light-induced glucose-to-catalyst charge transfer can activate the Cβ-H bond to promote the rate-determining step of intramolecular hydrogen shift in glucose-to-fructose ***,the introduced structural oxygen in HC-CN can not only facilitate the local electric field formation to achieve rapid charge transport/separation and regulate selective·O^(-)_(2)generation for oriented C3-C4 bond cleavage of fructose but also narrow the energy band gap to broaden the light absorption range of HC-CN,contributing to enhanced LA production without exogenous ***,HC-CN is highly recyclable and exhibits negligible environmental burden and low energy consumption,as disclosed by the life cycle *** construction of full-spectrum light adsorption and versatile reaction sites provides a reference for implementing multi-step biomass and organic conversion processes under mild conditions.

关键词： biomass valorization lactic acid life cycle assessment photocatalysis pyroelectric effect

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CMOS-compatible wafer-scale Si subulate array for superb switching uniformity of RRAM with localized nanofilaments

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Science China Materials 2022年第6期65卷 1623-1630页

作者： Ying Zhang Xiaolong Zhao Xiaolan Ma Yu Liu Xuanze Zhou Meiyun Zhang Guangwei Xu Shibing Long Key Laboratory of Microelectronic Devices&Integration Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China School of Microelectronics University of Science and Technology of ChinaHefei 230026China University of Chinese Academy of Sciences Beijing 100049China

Resistive switching random access memory(RRAM)is one of the most promising candidates with highdensity three-dimensional integration characteristics for nextgeneration nonvolatile memory ***,the poor uniformity issue caused by the stochastic property of the conductive filament(CF)impedes the large-scale manufacture of RRAM *** array has been introduced into the RRAM to minimize the CF randomness,but the methods are cumbersome,expensive,or resolution-limited for large-scale *** this work,Si subulate array(SSA)substrates with different curvature radii prepared by a wafer-scale and nanoscale-controllable method are introduced for RRAM *** SSA structure,which induces a quasi-single CF or a few CFs formed in the tip region(TR)of the device as evidenced by the high-resolution transmission electron microscopy and energy dispersive spectroscopy characterization,dramatically improves the cycle-to-cycle and device-to-device *** the curvature radius of the TR significantly improves the device performance,including switching voltages,high/low resistance states,and retention *** improved uniformity can be attributed to the enhanced local electric field in the *** proposed SSA provides a low-cost,uniform,CMOS-compatible,and nanoscale-controllable optimization strategy for the largescale integration of highly uniform RRAM devices.

关键词： resistive switching memristor RRAM Si subulate array enhancement of electric field

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Multitarget gas alarm system for high-performance and anti-interference chemical warfare agents simulants detection

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Science China(Technological Sciences) 2025年第3期68卷 349-358页

作者： Yubin YUAN Qiang WU Menglong JIAO Haiyang WU Weihua LIU Xuming WANG Xiangrui BU Gong LI Chuanyu HAN Long HU Xin LI Xiaoli WANG Shool of Microelectronics School of Electronics and Information EngineeringXi’an Jiaotong UniversityXi’an710049China The Key Lab of Micro-nano Electronics and System Integration of Xi’an City Xi’an710049China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou310024China School of Automation and Information Engineering Xi’an University of TechnologyXi’an710048China Key Laboratory for Physical Electronics and Devices of the Ministry of Education Xi’an Jiaotong UniversityXi’an710049China School of Science Xi’an Jiaotong UniversityXi’an710049China

Chemical warfare agents(CWAs)can cause significant harm to health and even death in a very short time even when inhaled in small amounts(~100 mg min/m^(3)).Detection equipment based on conventional techniques,including gas chromatography-mass spectrometry,Raman spectroscopy,fluorescence spectroscopy,and ion mobility spectrometry,have the disadvantages of high cost,long detection time,and high power ***,portable,and convenient equipment for target CWAs detection under interference is a *** this study,we propose an alarm system comprising a multitype micro sensor array and a field-programmable gate array-based readout circuit for CWAs simulants *** common volatile organic compound,temperature,and water vapor interference,the proposed multitype sensor-based detection system realizes an alarm function in less than 20 s with thresholds of 1 ppm dimethyl methylphosphonate(DMMP),4.6 ppm 2,2'-dichlorodiethyl ether(DCE),and 20 ppm SO_(2).Furthermore,the proposed detection system was evaluated outside the laboratory and passed the wilderness test,demonstrating its reliability in the *** believe that the proposed alarm system will contribute to the development of intelligent,portable,low-cost,and anti-interference CWAs detection technology.

关键词： alarm system CWAs simulants surface acoustic wave sensor mixed gas anti-interference

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