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Low-Voltage IGZO Field-Effect Ultraviolet Photodiode

作者： GAO Si-ze NI Bang-fa ZHANG Gui-ying XIAO Cai-jin LIU Cun-xiong CHEN Zhe NIE Peng LIU Chao ZHAO Chang-jun College of Physics Science and Engineering Technology Guangxi University

This system is designed to pick up sound signals from large volume,low-threshold energy, low-background superheated droplets bubble detectors.A sound-sensitive bubble detector is composed of a container filled with a mixture of superheated droplets and gel,a temperature and pressure control system,and an audio acquisition system attached on the outer surface of the container.The superheated droplets are in a metastable and superheated state at ambient temperature and pressure.When the outside

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Chinese physics Letters 2024年第6期41卷 156-161,I0001-I0003页

作者：宋双梁会力霍文星张广张永晖王绩梅增霞 Songshan Lake Materials Laboratory Dongguan 523808China Institute of physics Chinese Academy of SciencesBeijing 100190China college of physics Liaoning UniversityShenyang 110036China Department of Instruments science and technology School of Precision Instrument and Opto-electronics EngineeringTianjin UniversityTianjin 300072China National Key Laboratory of Scattering and Radiation Beijing 100039China School of physics and Optoelectronic engineering Shandong University of TechnologyZibo 255000China

In the era of Internet of Things(Io Ts),an energy-efficient ultraviolet(UV)photodetector(PD)is highly desirable considering the massive usage scenarios such as environmental sterilization,fire alarm and corona discharge monitoring.So far,common self-powered UV PDs are mainly based on metal-semiconductor heterostructures or p–n heterojunctions,where the limited intrinsic built-in electric field restricts further enhancement of the photoresponsivity.In this work,an extremely low-voltage field-effect UV PD is proposed using a gatedrain shorted amorphous IGZO(a-IGZO)thin film transistor(TFT)architecture.A combined investigation of the experimental measurements and technology computer-aided design(TCAD)simulations suggests that the reverse current(ⅠR)of field-effect diode(FED)is highly related with the threshold voltage(Vth)of the parental TFT,implying an enhancement-mode TFT is preferable to fabricate the field-effect UV PD with low dark current.Driven by a low bias of-0.1 V,decent UV response has been realized including large UV/visible(R_(300)/R_(550))rejection ratio(1.9×10^(3)),low dark current(1.15×10^(-12)A)as well as high photo-to-dark current ratio(PDCR,~10^(3))and responsivity(1.89 A/W).This field-effect photodiode provides a new platform to construct UV PDs with well-balanced photoresponse performance at a low bias,which is attractive for designs of large-scale smart sensor networks with high energy efficiency.

关键词： IGZO attractive ultraviolet

Numerical and experimental investigation of aerodynamic heat control of leading edge of hypersonic vehicle's flexible skin

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science China(Information sciences) 2022年第10期65卷 211-224页

作者： Xiaozhou Lü Chao YUAN Weimin BAO Guanghui BAI Fancheng MENG School of Aerospace science and technology Xidian University science and technology on Space physics Laboratory college of Materials science and engineering Chongqing University of Technology

In this paper, a flexible skin inspired by the sudoriferous gland structure of human skin is developed for ultra-thermal protection of hypersonic morphing vehicles. The effect of different coolants and cooling flow rates on the cooling performance of the leading edge is studied using finite element analysis.A wind tunnel experiment is conducted at high temperatures with the heat flux Q = 700 k W/m2, and the results indicate the following:(1) the flexible skin can effectively reduce the surface temperature of hypersonic vehicles;(2) when using liquid water instead of argon as the cooling medium, the cooling efficiency of flexible skin performs better;(3) when liquid water is used as the cooling medium, the cooling effect peaks at a flow rate of 0.01 m/s, and further increasing the flow rate will not benefit cooling efficiency significantly;(4) the flexible skin can withstand extreme thermal environments, demonstrating its feasibility in applications of over-limit thermal protection for hypersonic morphing vehicles. This study aims at optimizing the cooling performance of the flexible skin for ultra-thermal protection. The proposed skin can overcome the heat-resistance limit of flexible materials with morphing properties, laying a theoretical and experimental foundation for its future applications in hypersonic morphing vehicles.

关键词： hypersonic vehicle flexible skin ultra-thermal protection micro-channel transpiration cooling

Triphenylamine-based highly active two-photon absorbing chromophores with push-pull systems

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Chinese Chemical Letters 2023年第7期34卷 444-448页

作者： Yanqi Ban Linhong Hao Zhenbo Peng Lishui Sun Lihua Teng Yingjie Zhao college of Polymer science and engineering Qingdao University of Science and TechnologyQingdao 266042China college of Mathematics and physics Qingdao University of Science and TechnologyQingdao 266061China

Two triphenylamine-based star-type push-pull chromophores(T1, T2) were designed and synthesized.Triphenylamine serves as the central core and acts as an electron-donating group surrounded by electronwithdrawing pentafluorobenzene or N,N-dimethyl substituted tetrafluorobenzene, which are connected by ethylene bridges. Single-crystal X-ray diffraction confirmed the structures and molecular arrangement of two chromophores. The systematic photophysical research of T1 and T2 absorption characteristics was carried out to gain a better understanding of how structure-property relationships affect the observed nonlinear optical absorption phenomenon. Complementary calculations based on density functional theory(DFT) further confirmed the experimental results. Both chromophores exhibited excellent two-photon absorption(TPA) properties in CH_(2)Cl_(2). Notably, T2 has more remarkable nonlinear optical absorption effects with the TPA cross-section up to 4.24 × 10~7GM. By adjusting the electronic structures of the chromophores through introducing pentafluorobenzene or N,N-dimethyl as functional groups with different electron-donating or withdrawing behaviors, the TPA performance of the small organic molecule could be greatly enhanced. These molecular structures with push-pull systems were excellent candidates for different two-photon applications.

关键词： Star-type chromophores Triphenylamine derivatives Two-photon absorption Nonlinear optical materials Push-pull systems

Facile synthesis of bismuth nanoparticles for efficient self-powered broadband photodetector application

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Journal of Materials science & technology 2022年第31期126卷 161-168页

作者： Song Yang Shujie Jiao Yiyin Nie Tanjun Jiang Hongliang Lu Shuo Liu Yue Zhao Shiyong Gao Dongbo Wang Jinzhong Wang Yongfeng Li School of Materials science and engineering Harbin Institute of Technology Key Laboratory for physics and technology for Advanced Batteries Ministry of Education College of Physics Jilin University

Bismuth, an emerging topological insulator, has attracted great interest due to its fascinating properties. Herein, a facile, environmentally friendly, and low-cost solvothermal route was proposed to synthesize high-quality single-crystal bismuth nanoparticles. The performance of bismuth nanoparticles photoelectrochemical-type photodetector has been systematically evaluated. The responsivity spectrum shows that the bismuth nanoparticles photodetector has a broad response range from ultraviolet(UV)to near-infrared(NIR), with the highest responsivity of 4.979 mA/W at a wavelength of 405 nm without bias. Additionally, the device exhibits a fast response speed(tr< 12 ms, td< 46 ms) and a high specific detectivity(3.71 × 1010Jones). These results indicate that bismuth nanoparticles have great potential in the application of self-powered broadband photodetectors with high responsivity. Moreover, the working mechanism of bismuth nanoparticles photodetector was proposed.

关键词： Bismuth nanoparticles Photoelectrochemical Self-powered Broadband photodetector

介孔氧化镁中碳量子点三重态的产生及其磷光和光催化特性

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science China Materials 2024年第1期67卷 170-178页

作者：姚清吴浩怡梁锦基王传龙金亚洪胡义华唐友宏 School of physics and Optoelectronic engineering Guangdong University of TechnologyGuangzhou 510006China Institute for NanoScale science and technology College of Science and EngineeringFlinders UniversitySouth Australia 5042Australia

本文通过高温热解柠檬酸(CA)和Mg_(2)(OH)_(2)CO_(3)的混合物将碳量子点嵌入到介孔MgO中,并观察到室温磷光.碳量子点通过含氧官能团与MgO连接并被限制于MgO介孔中.由于碳量子点表面原子自动受限,其电子自旋角动量将改变,产生自旋三重态... 详细信息

本文通过高温热解柠檬酸(CA)和Mg_(2)(OH)_(2)CO_(3)的混合物将碳量子点嵌入到介孔MgO中,并观察到室温磷光.碳量子点通过含氧官能团与MgO连接并被限制于MgO介孔中.由于碳量子点表面原子自动受限,其电子自旋角动量将改变,产生自旋三重态并可获得磷光.碳量子点与MgO的杂化复合物表现出典型的激发依赖现象,当激发波长增加时,荧光和室温磷光产生明显的红移,因此具有良好的防伪应用价值.CA在MgO中热解,使碳量子点与MgO的杂化复合物具有较高的比表面积和较宽的吸收波长.碳量子点的三重态电子延迟复合提高了载流子分离效率.因此与对照组样品对比,该复合物对有机污染物的光催化降解能力有显著提高.

关键词：自旋角动量室温磷光激发波长载流子分离三重态碳量子点含氧官能团高温热解

Conservation laws for Birkhoffian systems of Herglotz type

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Chinese physics B 2018年第9期27卷 223-229页

作者：张毅田雪 college of Civil engineering Suzhou University of Science and Technology college of Mathematics and physics Suzhou University of Science and Technology

Conservation laws for the Birkhoffian system and the constrained Birkhoffian system of Herglotz type are studied. We propose a new differential variational principle, called the Pfaff-Birkhoff-d＇Alembert principle of Herglotz type. Birkhoff＇s equations for both the Birkhoffian system and the constrained Birkhoffian system of Herglotz type are obtained. According to the relationship between the isochronal variation and the nonisochronal variation, the conditions of the invariance for the Pfaff-Birkhoff-d＇Alembert principle of Herglotz type are given. Then, the conserved quantities for the Birkhoffian system and the constrained Birkhoffian system of Herglotz type are deduced. Furthermore, the inverse theorems of the conservation theorems are also established.

关键词： Birkhoffian system conversation law differential variational principle variational problem of Herglotz type

Sm^(3+)induced structural phase transition,spectral,morphological,magnetic,dielectric and impedance properties of Ni_(0.1)Cu_(0.9)Sm_(x)Fe_(2-x)O_(4) nanoferrites

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Journal of Rare Earths 2023年第11期41卷 1736-1745,I0003页

作者： K.Rajashekhar G.Vinod K.Mahesh Kumar G.Harikishan Laxman Naik J Department of physics University College of ScienceOsmania UniversityHyderabad500007TelanganaIndia Department of physics Kamala Institute of Technology and ScienceHuzurabad505468TelanganaIndia Department of physics CMR College of Engineering&TechnologyHyderabad501401TelanganaIndia

In the present study,rare earth samarium(Sm^(3+))substituted Ni-Cu spinel ferrites with the composition of Ni_(0.1)Cu_(0.9)Sm_(x)Fe_(2-x)O_(4)(0≤x≤0.05 in steps of 0.01)were synthesized by using the citrate induced sol-gel auto combustion technique.These ferrites'structural,optical,magnetic,and dielectric studies were carried out using X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),field emission scanning electron microscopy(FESEM),ultraviolet-visible(UV-vis),a vibrational sample magnetometer(VSM),and an LCR meter.The pure Ni-Cu ferrite exhibits a tetragonal structure owing to the presence of the John Tellar ion(Cu^(2+)).XRD patterns confirm that the tetragonal structure gradually transforms into the cubic spinel structure with samarium substitution.The nano-scale structures of these ferrites were confirmed by the average crystallite size(10.11-20.99 nm)derived from the X-ray diffraction patterns,and grain size(42.60-83.36 nm)assessed from FESEM photographs.The existence of elements according to their chemical composition was verified by using energy dispersive X-ray(EDX)spectra.The absorption bands(v_(1) and v_(2))detected in FTIR transmission spectra below the wavenumber of 600 cm^(-1)reveal the stretching vibrations of M-O bonds in the spinel structure at tetrahedral and octahedral locations.The band gap ene rgy obtained from UV absorption reveals the semiconducting nature of the samples.The high saturation magnetization(M_(s))is noticed at 15 K temperature for x=0.02 composition as 32.98 emu/g,while at 300 K for x=0.01composition as 27.61 emu/g.The suggested cation distribution is in good agreement with observed and predicted magnetic moment values at 300 K.The expected behavior of ferrites reveals the observed dielectric constant,loss tangent,and ac-conductivity values in the frequency range of 20 Hz-20 MHz.Cole-Cole plots confirm that the impedance contribution is attributed to grain boundaries.

关键词： Nanoferrites XRD Magnetic properties Dielectric properties Cole-cole plots Rare earths

Theoretical Studies on the Structure and Detonation Properties of a Furazanbased Energetic Macrocycle Compound

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Chinese Journal of Structural Chemistry 2016年第1期35卷 16-24页

作者：梅争李小红崔红玲王会娴张瑞州 college of physics and engineering Henan University of Science and Technology

Based on the full optimized molecular geometric structure at 6-311＋＋G＊＊ level,the density（ρ）,detonation velocity（D）,and detonation pressure（P） for a new furazan-based energetic macrocycle compound,hexakis[1,2,5]oxadi-azole[3,4-c：3＇,4＇-e;3＇＇,4＇＇-g：3＇＇＇,4＇＇＇-k：3＇＇＇＇,4＇＇＇＇-m：3＇＇＇＇＇,4＇＇＇＇＇-o][1,2,9,10]-tetraazacyclohexadecine,were investigated to verify its capacity as high energy density material（HEDM）. The infrared spectrum was also predicted. The heat of formation（HOF） was calculated using designed isodesmic reaction. The calculation on the bond dissociation energies（BDEs） was done and the pyrolysis mechanism of the compound was studied. The result shows that the N3–O1 bond in the ring may be the weakest one and the ring cleavage is possible to happen in thermal decomposition. The condensed phase HOF and the crystal density were also calculated for the title compound. The detonation data show that it can be considered as a potential HEDM. These results would provide basic information for the molecular design of novel high energy materials.

关键词： detonation properties heat of formation high energy density material isodesmic reaction

Ab Initio Studies of Radicals HBX(X=H, F, Cl, Br): Molecular Structure,Vibrational Frequencies and Potential Energy

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Chinese physics Letters 2018年第1期35卷 22-26页

作者：刘启鑫梁敏苗泉张进娟孙二平任廷琦 college of Electrical engineering and Automation Shandong University of Science and Technology college of Electronics Communication and Physics Shandong University of Science and Technology

We describe high-level ab initio calculations on the BH_2, HBF, HBCl and HBBr radicals. Molecular structure,vibrational frequencies and potential energy curves of the ground state and the first excited state, which are two Renner-Teller components for a^2Π state at linearity, are studied using the basis sets aug-cc-pVTZ and icMRCI＋Q technique. On the basis of the potential energy curves, a reliable potential energy barrier to dissociation HB＋X（X=F, Cl, Br） fragments and to linearity are given. The ab initio results will add some understanding on the spectrum and the photo-dissociation dynamics of the series of radicals.

关键词： Ab Initio Studies of Radicals HBX Molecular Structure,Vibrational Frequencies and Potential Energy X HBF Cl Br