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2.0μm附近模拟呼吸气体中^(1.)CO_2/^(1.)CO_2同位素丰度的高精度实时在线测量

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物理学报 2018年第6期67卷 146-154页

作者：孙明国马宏亮刘强曹振松王贵师刘锟黄印博高晓明饶瑞中中国科学院大气成分与光学重点实验室合肥230031 中国科学院安徽光学精密机械研究所大气物理化学研究室合肥230031 安徽工程大学数理学院芜湖241000 安庆师范大学物理与电气工程学院安庆246011

采用可调谐二极管激光吸收光谱技术,结合一新型多通池搭建了一套模拟呼吸气体中CO_2同位素丰度的测量装置.气体的压强、温度和流速被很好地控制且均能保持长期的稳定性;采用三次多项式拟合光谱基线,对光谱进行归一化,很好地消除了功率... 详细信息

采用可调谐二极管激光吸收光谱技术,结合一新型多通池搭建了一套模拟呼吸气体中CO_2同位素丰度的测量装置.气体的压强、温度和流速被很好地控制且均能保持长期的稳定性;采用三次多项式拟合光谱基线,对光谱进行归一化,很好地消除了功率变化对测量结果的影响;利用移窗-回归技术消除频率漂移对同位素丰度测量的影响.实验结果表明:移窗-回归法的引入不仅延长了系统的稳定时间,还提高了系统的测量精度;小波去噪的应用获得了比多光谱平均法高2倍的信噪比;系统的稳定时间为1.0 s;Kalman滤波后系统测量精度为0.067‰.

关键词：激光吸收光谱稳定同位素呼吸气体精确度

SiO_2包覆的银纳米颗粒及其团簇的表面增强荧光效应

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中国科学：物理学、力学、天文学 2018年第4期48卷 38-47页

作者：张成云张正龙韩庆艳杨超王鹏弥小虎郑海荣陕西师范大学物理学与信息技术学院西安710062 西安邮电大学电子工程学院西安710121

在高温条件下以乙二醇为还原剂,制备银纳米颗粒,并用改良的St?ber方法,在银纳米颗粒及其多聚体外面包覆一层8 nm左右的二氧化硅,制备出Ag@SiO_2复合纳米颗粒.二氧化硅壳层的包覆不仅可以调控有机分子和银纳米颗粒之间的距离,避免荧光猝... 详细信息

在高温条件下以乙二醇为还原剂,制备银纳米颗粒,并用改良的St?ber方法,在银纳米颗粒及其多聚体外面包覆一层8 nm左右的二氧化硅,制备出Ag@SiO_2复合纳米颗粒.二氧化硅壳层的包覆不仅可以调控有机分子和银纳米颗粒之间的距离,避免荧光猝灭,还可以提高金属颗粒的分散性和稳定性,有效地拓展其在生物领域中的应用.利用电子束刻蚀技术在衬底表面做记号,成功标记出单个状态的Ag@SiO_2复合纳米颗粒及其多聚体.以Rh6G为探测分子,系统研究了颗粒尺寸、多聚体聚合程度以及激发光的偏振性质对表面增强荧光效应的影响.结果表明,Ag@SiO_2纳米复合衬底对吸附在其表面的Rh6G分子具有明显的荧光增强作用,且增强效果受到颗粒粒径、团聚程度、分布方式以及偏振性质变化的调控.

关键词：复合纳米颗粒表面增强荧光颗粒尺寸团簇性质偏振

Ti3AlC2的制备及Ti3C2Tx薄膜的电化学性能研究

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中国科学：化学 2018年第3期48卷 289-297页

作者：王新宇武立立高红张喜田哈尔滨师范大学物理与电子工程学院光电带隙材料教育部重点实验室哈尔滨150025 黑龙江科技大学工程实训和基础中心哈尔滨150022

采用一步机械合金化的方法合成了高纯度Ti_3AlC_2.以此高纯度Ti_3AlC_2为前驱体,采用简单安全的方法进行腐蚀剥离,成功地制备出具有良好柔韧性的Ti_3C_2T_x薄膜电极.在1.M KOH电解液中进行电化学测试,扫速为2 mV/s时,Ti_3C_2T_x的体电... 详细信息

采用一步机械合金化的方法合成了高纯度Ti_3AlC_2.以此高纯度Ti_3AlC_2为前驱体,采用简单安全的方法进行腐蚀剥离,成功地制备出具有良好柔韧性的Ti_3C_2T_x薄膜电极.在1.M KOH电解液中进行电化学测试,扫速为2 mV/s时,Ti_3C_2T_x的体电容可达到509.7 F/cm^3,1.000圈充放电循环后,电容保持率高达95%.因此,一步机械合金化方法合成的Ti_3AlC_2适用于Ti_3C_2T_x薄膜的制备,且得到的Ti_3C_2T_x薄膜具有很好的电容性质,可用于超级电容器电极材料.

关键词：机械合金化 Ti3AlC2 Ti3C2Tx纳米片电极超级电容器

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掺氮金刚石电极性能及其氧化降解硝基苯研究

无机材料学报 2018年第5期33卷 565-569页

作者：严世胜彭鸿雁赵志斌潘孟美羊大立阿金华叶国林王崇太郭心玮海南师范大学物理与电子工程学院海口571158 海南师范大学化学与化工学院海口571158

采用热阴极直流辉光等离子体化学气相沉积法制备亚微米晶氮掺杂金刚石膜(nDD),采用SEM分析样品的表面形貌,分别用Hall测试和循环伏安法测试氮掺杂金刚石电极的电学和电化学性能。实验结果表明,当氮气流量低于30 sccm时,膜的电导率随氮... 详细信息

采用热阴极直流辉光等离子体化学气相沉积法制备亚微米晶氮掺杂金刚石膜(nDD),采用SEM分析样品的表面形貌,分别用Hall测试和循环伏安法测试氮掺杂金刚石电极的电学和电化学性能。实验结果表明,当氮气流量低于30 sccm时,膜的电导率随氮气流量的增大略有提高;氮气流量继续增大则电导率迅速下降,电导率最大为5.091.S/cm。氮掺杂金刚石电极具有较好的伏安性能,在酸性、中性和碱性介质中均具有较宽的电位窗口和较低的背景电流。以硝基苯为目标污染物测试nDD材料作为阳极氧化降解的电催化性能。在0.1.mol/L na2SO4溶液的支持电解质中,以氮掺杂金刚石为阳极降解0.5 mmol/L的硝基苯,反应时间300 min,硝基苯的降解率达到94%,化学需氧量(COD)去除率约68%。

关键词：热阴极直流辉光等离子体化学气相沉积掺氮亚微米晶金刚石电极电催化氧化硝基苯降解

Interfacial built-in electric field and crosslinking pathways enabling WS_(2)/Ti_(3)C_(2)T_(x) heterojunction with robust sodium storage at low temperature

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Journal of Energy Chemistry 2024年第2期89卷 635-645,I0014页

作者： Jiabao Li Shaocong Tang Jingjing Hao Quan Yuan Tianyi wang Likun Pan Jinliang Li Shenbo Yang Chengyin wang College of Chemistry and Chemical engineering Yangzhou UniversityYangzhou 225002JiangsuChina Shanghai Key Laboratory of Magnetic Resonance School of Physics and Electronic Science East China Normal UniversityShanghai 200241China Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsGuangdong Provincial Key Laboratory of Nanophotonic ManipulationDepartment of PhysicsJinan UniversityGuangzhou 510632GuangdongChina Hongzhiwei Technology(Shanghai)CO.LTD Shanghai 200241China

Developing efficient energy storage for sodium-ion batteries(SIBs)by creating high-performance heterojunctions and understanding their interfacial interaction at the atomic/molecular level holds promise but is also ***,sluggish reaction kinetics at low temperatures restrict the operation of SIBs in cold ***,cross-linking nanoarchitectonics of WS_(2)/Ti_(3)C_(2)T_(x) heterojunction,featuring built-in electric field(BIEF),have been developed,employing as a model to reveal the positive effect of heterojunction design and BIEF for modifying the reaction kinetics and electrochemical ***,the theoretical analysis manifests the discrepancy in work functions leads to the electronic flow from the electron-rich Ti_(3)C_(2)T_(x) to layered WS_(2),spontaneously forming the BIEF and“ion reservoir”at the heterogeneous ***,the generation of cross-linking pathways further promotes the transportation of electrons/ions,which guarantees rapid diffusion kinetics and excellent structure ***,superior sodium storage performance is obtained for the WS_(2)/Ti_(3)C_(2)T_(x) heterojunction,with only 0.2%decay per cycle at 5.0 A g^(-1.(25℃)up to 1.00 cycles and a high capacity of 293.5 mA h g^(-1.(0.1. g^(-1.after 1.0 cycles)even at-20℃.Importantly,the spontaneously formed BIEF,accompanied by“ion reservoir”,in heterojunction provides deep understandings of the correlation between structure fabricated and performance obtained.

关键词： WS_(2)/Ti_(3)C_(2)T_(x)heterojunction Built-in electric field Ion reservoir Reaction kinetics Sodium storage performance at low temperature

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基于可调铒纤激光器的温度测量系统研究

光通信技术 2018年第5期42卷 24-28页

作者：武永久李小方王旭刘玉芳河南师范大学物理与材料科学学院河南新乡453007 河南师范大学电子与电气工程学院河南新乡453007

实验研究了基于分布式布喇格反射镜(Distributed Bragg Reflectors,DBR)光纤激光器结构的光纤光栅传感系统,采用可调光纤法布里-珀罗(Fabry-Perot,F-P)滤波器和光纤环行器构成的可调反射腔镜对传感光栅进行波长扫描,实现了对光纤光栅温... 详细信息

实验研究了基于分布式布喇格反射镜(Distributed Bragg Reflectors,DBR)光纤激光器结构的光纤光栅传感系统,采用可调光纤法布里-珀罗(Fabry-Perot,F-P)滤波器和光纤环行器构成的可调反射腔镜对传感光栅进行波长扫描,实现了对光纤光栅温度的传感解调。与采用宽带光源、可调光纤F-P滤波器的光纤光栅温度传感解调系统进行了对比研究。实验结果表明,采用可调光纤激光器传感解调的温度测量系统具有解调速度更快,系统稳定性更强的优点。

关键词：光纤激光器可调法布里-珀罗滤波器光纤布喇格光栅传感解调

Harnessing overlapped temperature-salinity gradient in solar-driven interfacial seawater evaporation for efficient steam and electricity generation

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Journal of Energy Chemistry 2024年第8期95卷 694-700,I0015页

作者： Peida Li Dongtong He Jingchang Sun Jieshan Qiu Zhiyu wang State Key Lab of Fine Chemicals Liaoning Key Lab for Energy Materials and Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina school of {1. and electronic Technology Liaoning Normal UniversityDalian 116029LiaoningChina College of Chemical engineering Beijing University of Chemical TechnologyBeijing 100029China

Solar-driven interfacial water evaporation(SIWE)offers a superb way to leverage concentrated solar heat to minimize energy dissipation during seawater *** also engenders overlapped temperaturesalinity gradient(TSG)between water-air interface and adjacent seawater,affording opportunities of harnessing ***,the efficiency of conventional SIWE technologies is limited by significant challenges,including salt passivation to hinder evaporation and difficulties in exploiting overlapped TSG ***,we report self-sustaining hybrid SIWE for not only sustainable seawater desalination but also efficient electricity generation from *** enables spontaneous circulation of salt flux upon seawater evaporation,inducing a self-cleaning evaporative interface without salt passivation for stable steam ***,this design enables spatial separation and simultaneous utilization of overlapped TSG to enhance electricity *** benefits render a remarkable efficiency of90.8%in solar energy utilization,manifesting in co-generation of solar steam at a fast rate of 2.01.kg m^(-2)-h^(-1.and electricity power of 1.91.W m^(-2)with high *** interfacing the hybrid SIWE with seawater electrolyzer constructs a system for water-electricity-hydrogen co-generation without external electricity *** produces hydrogen at a rapid rate of 1.29 L h^(-1.m^(-2)and freshwater with 22 times lower na+concentration than the World Health Organization(WHO)threshold.

关键词： Solar-driven interfacial water evaporation Steam generation Electricity generation Seawater

Thermally modulated photoelectronic synaptic behavior in HfS_(2)/VO_(2) heterostructure

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Rare Metals 2024年第8期43卷 3798-3809页

作者： Le wang Lin wang Xiao-Yun Ye Xiong-Hu Xu Li-Yan Shang Ya-Wei Li Jin-Zhong Zhang Liang-Qing Zhu Zhi-Gao Hu Technical Center for Multifunctional Magneto-Optical Spectroscopy(Shanghai) Engineering Research Center of Nanophotonics&Advanced Instrument(Ministry of Education)Department of PhysicsSchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

neuromorphic computing is known for its efficient computational speed,low latency,and reduced power consumption,which is considered a pivotal technology to overcome the von neumann *** synapses are an indispensable component of neuromorphic computational artificial neural *** guarantee effective and precise processing of optical signals,it must have a high responsivity,detectivity,and the ability to adapt to various ***,a synaptic transistor based on the HfS_(2)/VO_(2) heterojunction with a responsivity of8.6×1.^(3) A·W^(-1.and a detectivity of 1.26×1.^(1.)Jones at405 nm laser was ***,the typical synaptic behavior was successfully simulated,including postsynaptic currents(PSCs),the transition from shortterm plasticity(STP)to long-term plasticity(LTP).When VO_(2) converts from the semiconductor state to the metal state,the HfS_(2)/VO_(2) heterojunction transforms into a Schottky heterojunction from a TypeⅡheterojunction with ***'s important,the heterojunction still exhibits excellent responsivity and detectivity,as well as stability of synaptic *** addition,the classical Pavlovian conditioning experiment is simulated under different laser intensity to study the brain's associative learning *** results demonstrate that the HfS_(2)/VO_(2) heterojunction synapse exhibits significant responsivity and detectivity and is adaptable to high-temperature environments,showing great potential for neuromorphic computational applic ations.

关键词： HfS_(2) VO_(2) Phase transition Photoelectric synapse Heterojunction

Layer-by-layer epitaxy growth of thickness-controllable two-dimensional tungsten disulfide

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Science china(Information Sciences) 2024年第5期67卷 302-310页

作者： Jieyuan LIAnG Zixing ZOU Junwu LIAnG Di wang Biao wang Anshi CHU Jiali YI Cheng ZHAnG Lizhen FAnG Tian ZHAnG Huawei LIU Xiaoli ZHU Dong LI Anlian PAn Key Laboratory for Micro-nano physics and Technology of Hunan Province State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan Institute of Optoelectronic IntegrationCollege of Materials Science and Engineering School of Physics and ElectronicsHunan University school of {1. Information and Electrical engineering Changsha University school of {1. and Telecommunication engineering Yulin Normal University Units Semiconductor Technology Co. Ltd. school of {1. and electronics Hunan Normal University

Bilayer transition metal dichalcogenides（TMDs） balance the high mobility of single layers with the high state density of multilayers and therefore have promising application prospects in high-performance electronics. However, the layer-controlled growth of 2D materials is still confronted with challenges such as poor repeatability between different labs and a limited understanding of the growth mechanism at the atomic scale. Herein, we report a new carbon-assisted chemical vapor deposition process that can realize the growth of WS2sheets with high yield, precise thickness controllability, and repeatability. We show that carbon can act as a reducing agent and catalyst that preferentially reacts with the WO3precursor to form intermediate WO3-xproducts with low-valence state W. The resulting oxycarbide gas has a low surface adsorption energy when deposited on the surface of as-grown WS2, which provides nucleation sites for the subsequent layer of WS2growth and leads to the vertical growth of WS2sheets. The growth mechanism is thoroughly investigated. Electrical transport measurements show that the produced bilayer WS2possesses a high carrier mobility(up to 58 cm2·V-1.s-1. and small subthreshold swing（estimated to be 1.8 mV/decade）,which are among the best reported results for TMDs produced using CVD.

关键词： WS2 thickness-controlled growth chemical vapor deposition additive carbon