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Electrocaloric effect and pyroelectric properties of organic–inorganic hybrid （C2H5NH3）2CuCl4

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Chinese Physics B 2019年第11期28卷 344-348页

作者： Yi Liu Yan-Fen Chang Young Sun Jun Shen Li-Qin Yan Zun-Ming Lu School of Material Science and Engineering Hebei University of TechnologyTianjin 300130China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

The organic–inorganic hybrid(C2H5NH3)2 CuCl4(EA2CuCl4) single crystals are prepared by the solvothermal condition method. The x-ray diffraction, scanning electron microscopy, dielectric permittivity, pyroelectric current, and heat capacity are used to systematically investigate the electrocaloric performances of EA2CuCl4. The pyroelectric currents are measured under various voltages, and the electrocaloric effect(ECE) is calculated. Its ECE exhibits an isothermal entropy change of 0.0028 J/kg·K under an electric field of 30 kV/cm associated with a relatively broad temperature span. Further, the maximum pyroelectric coefficient(p) is 4× 10^-3 C/m^2·K and the coefficient β for generating ECE from electric displacement D is 1.068× 10^8 J·cm·K^-1·C^-2 at 240 K. Our results indicate that the ECE behavior of organic–inorganic hybrid EA2CuCl4 is in accordance with Jona and Shirane’s opinion in which the ECE should occur both below and above the Curie temperature Tc.

关键词： electrocaloric effect pyroelectric properties organic–inorganic perovskite

Gradient refractive structured NiCr thin film absorber for pyroelectric infrared detectors

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Chinese Physics B 2019年第6期28卷 419-423页

作者： Yunlu Lian He Yu Zhiqing Liang Xiang Dong School of Optoelectronic Information University of Electronic Science and Technology of China (UESTC)

A gradient refractive structured NiCr film that has a high extinction coefficient at far infrared range(8-μm–24 μm) is presented as an absorber for pyroelectric infrared detectors. The absorber features high absorption efficiency due to the low reflection off the structured surface and high absorption across the film thickness. The refractive index and extinction coefficient are extracted using spectroscopic ellipsometry. It is found that the single NiCr film exhibits an increasing refractive index as the gas atmosphere pressure increases, hence the three-layer gradient NiCr absorber can be fabricated by adjusting the gas atmosphere pressure during sputtering deposition. Essential Macleod software has been used to generate an efficient film structure design and the calculations show similar absorptance trend compared to the experimental measurement result. The results indicate that the gradient refractive structured metal thin film absorber can provide high absorption for applications in thermal sensing.

关键词： pyroelectric infrared detector spectroscopic ellipsometry deposition thermal sensing

pyroelectric PROPERTY OF TGS-PVDF COMPOSITE MATERIAL

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Chinese Science Bulletin 1990年第20期35卷 1690-1694页

作者：王民房昌水卓洪升刘凤霞李晓红 Institute of Crystal Materials Shandong University Jinan 250100 PRC

Ⅰ. INTRODUCTIONToday, the composite material becomes an important aspect in the development of material science. The low-cost pyroelectric material, a new type of functional composite material made from the mixture of single crystal powders and polymer and used in IR detection, is also developing, because it possesses not only good pyroelectric and piezoelectric properties,

关键词： pyroelectric property TGS-OVDF composite material

Enhanced thermal and pyroelectric properties in 0-3 TGS:PVDF composites doped with graphene for infrared application

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Journal of Advanced Dielectrics 2017年第1期7卷 39-44页

作者： Xiaodong Feng Minqiang Wang Le Li Zhi Yang Minghui Cao Z.-Y.Cheng Electronic Materials Research Laboratory(EMRL)Key Laboratory of Education Ministry International Center for Dielectric Research(ICDR)Xi'an Jiaotong University Xi'an 710049P.R.China Materials Research and Education Center Auburn University AuburnAL 36849USA

pyroelectric composites of triglycine sulfate(TGS)-polyvinylidene difluoride(PVDF)doped with graphene are *** is found that the graphene can effectively improve the polling efficiency and thermal property of the composites so that the infrared detective performance can be significantly *** example,by adding about 0.83 wt.%of graphene,the infrared detective property can be improved by more than 30%.It is also found that the size of the graphene plays a critical role on the property *** example,the small-sized graphene prepared by ultrasonic exfoliation(UE)method is more effective than the big-sized graphene prepared by electrochemical exfoliation(EE)method.

关键词： Composites polling thermal pyroelectric graphene doping

CRYSTAL GROWTH AND pyroelectric PROPERTIES OF A SERIES OF TGSFB SINGLE CRYSTALS

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Chinese Science Bulletin 1992年第2期37卷 122-125页

作者：郑吉民车云霞 Department of Chemistry Nankai University Tianjin 300071 PRC

Triglycine sulphate （NH2CH2COOH）3·H2SO4 is a well-known ferroelectric crystal widely used in pyroelectric application. Being monoclinic, its space group is P21 and its polarization direction is along the two-fold screw axis. Its Curie temperature （Tc）is 49℃ and it crystallizes at room temperature. Above 49℃ the spontaneous polarization disappears

关键词： pyroelectric single crystal growth triglycine sulphate/fluorobeyllate.

Experimental Studies on Molecular Assembly of Infrared pyroelectric Detector Using Langmuir-Blodgett Method

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Chinese Science Bulletin 1993年第14期38卷 1225-1228页

作者：杨钧王融王卉董玺娟汤大新江雷李铁津 Institute of Atomic and Molecular Physics Jilin University Changchun 130023 PRC Department of Chemistry

1 Introduction Since the Langmuir-Blodgett (LB) technique was developed, the considerable interest in the molecular assemblies is to build up a function of organic ultra-thin films. A number of research results show that LB films possess very important applications in photoelectric transfer fields. Due to extremely small thickness of the molecular

关键词： pyroelectric Langmuir-Blodgett film infrared detector

pyroelectric Properties of PVDF:MWCNT Nanocomposite Film for Uncooled Infrared Detectors

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Materials Sciences and Applications 2012年第12期3卷 851-855页

作者： Matthew E. Edwards Ashok K. Batra Ashwith K. Chilvery Padmaja Guggilla Michael Curley Mohan D. Aggarwal Department of Physics Chemistry and Mathematics Alabama A&M University Normal AL 35762 USA

pyroelectric multi-walled carbon nanotubes:polyvinylidene fluoride (PVDF:MWCT) composite films have been fabriccated by the solution casting technique. The pyroelectric and dielectric properties of the composite films were examined for their use in uncooled infrared detectors. The properties measured include: 1) dielectric constants and 2) pyroelec- tric coefficient as a function of temperature. From the foregoing parameters, materials Figures-of-merit, for infrared detection and thermal-vidicons, were calculated. The results indicated Figures-of-merit of composite film were higher than pristine polyvinylidene fluoride films.

关键词： pyroelectric IR Detectors Multi-Walled Carbon Nanotubes pyroelectric Properties

2D AND 3D GREEN’S FUNCTIONS FOR pyroelectric MEDIA

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2D AND 3D GREEN’S FUNCTIONS FOR PYROELECTRIC MEDIA

Transforming Energy Making Use of pyroelectric:A Conservation Technique

2012全国压电和声波理论及器件技术研讨会

作者： Peng-Fei HOU Jie TONG Hai-Yang JIANG Department of Engineering Mechanics Hunan University

Green’s functions play an important role in electroelastic analyses of pyroelecric ***,most works available on this topic are on case of identical *** on the 2D and 3D general solution of pyroelectric media,which is expressed in harmonic functions,and employing the trial-and-error method,the 2D and 3D Green’s function for a steady line heat source and a steady point heat source in semi-infinite,infinite and two-phase pyroelectric plane and media is presented by newly induced harmonic functions with undetermined *** corresponding coupled field can be obtained by substituting these functions into the 2D and 3D general solution,and the undetermined constants can be obtained by boundary conditions,continuous conditions and equilibrium conditions.

关键词： 2D 3D Green’s function Semi-infinite Infinite Two-phase pyroelectric

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Transforming Energy Making Use of Pyroelectric:A Conservatio...