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Molecular crystal material with high pyroelectric detection quality factor
Pyroelectrics are a class of dielectric materials with spontaneous polarization, and their spontaneous polarization can change with temperature. The detectors developed based on pyroelectric materials have the advantages of fast response and high sensitivity, and have been widely used in fields such as radiation energy detection, infrared detection, and industrial safety monitoring. The extrinsic ferroelectrics belong to the category of pyroelectric materials. Because of their unique dielectric bistable characteristics, they can maintain a high detection quality factor in critical areas and can be applied to the preparation of high-performance detectors.
Under the support of the National Natural Science Outstanding Youth Fund, the “973†Program of the Ministry of Science and Technology, and the Outstanding Youth Fund of Fujian Province, the Luo Junhua Research Group of the Key Laboratory of Optoelectronic Materials Chemistry and Physics of the Chinese Academy of Sciences Fujian Institute of Material Structure successfully designed a case of performance. Excellent pyroelectric crystal material, the material exhibits excellent pyroelectric detection performance, especially in the vicinity of the phase transition point of the performance is significantly better than the traditional triglycine sulfate (TGS) and other intrinsic ferroelectric materials, in the cooling Small area pyroelectric detectors have potential applications. With the help of variable temperature single crystal X-ray diffraction, differential thermal analysis, variable temperature dielectric and pyroelectric properties tests, etc., the reversible structural transformation of this molecular crystal and the induction mechanism of spontaneous polarization were revealed. Posted on Adv. Mater. (2015, DOI: 10.1002/adma.201501923). The discovery of this material and the study of its microstructure mechanism will provide new ideas for the synthesis and design of new molecular pyroelectric detection materials and promote the research and development of related crystalline materials.
In addition, the research group has also made a series of advances in the research of molecular-based optoelectronic functional crystalline materials (Adv. Mater. 2013, 25, 4159; Adv. Optical Mater., 2014, 2, 1199; Chem. Commun., 2015, 51, 2298; Chem. Mater., 2015, 27, 4493).
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