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Clamping effect driven design and fabrication of new infrared birefringent materials with large optical anisotropy

Science China Chemistry 2023年第4期66卷 1086-1093页

作者： Linan Wang Chenchen Tu Hongbo Gao Jiazheng Zhou Hongshan Wang Zhihua Yang Shilie Pan Junjie Li Research Center for Crystal Materials CAS Key Laboratory of Functional Materials and Devices for Special EnvironmentsXinjiang Technical Institute of Physics&ChemistryChinese Academy of SciencesUrumqi 830011China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Infrared(IR)birefringent materials with large optical anisotropy and wide transparency range are important for efficient light manipulation in various IR optical ***,two new IR birefringent materials AMgGeSe_(3)(A=Li,Na)with large optical anisotropy were rationally designed by a rigid octahedron and flexible dimer combined strategy and fabricated in *** introduction of rigid[LiSe_(6)]/[NaSe_(6)]and[MgSe_(6)]octahedra effectively regulates the geometry and arrangement of the flexible[Ge2Se6]dimers,resulting in the birefringence as large as 0.334@1,064 nm in LiMgGeSe_(3) and 0.445@1,064 nm(the largest one in the reported[Ge_(2)Se_(6)]dimer-contained selenides)in NaMgGeSe_(3).Density functional theory(DFT)calculations and statistical analyses highlight the influence of polarizability anisotropy,density,arrangement of units,as well as layer distance on *** results indicate that AMgGeSe_(3)(A=Li,Na)crystals are the promising IR birefringent materials and it gives an insight into the exploration of new IR birefringent materials with large birefringence based on the clamping effect from rigid groups.

关键词： birefringence clamping effect AMgGeSe_(3) [Ge_(2)Se_(6)]dimer octahedra

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Facet and dimensionality control of Pt nanostructures for efficient oxygen reduction and methanol oxidation electrocatalysts

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Nano Research 2016年第9期9卷 2811-2821页

作者： Lingzheng Bu Yonggang Feng Jianlin Yao Shaojun Guo Jun Guo Xiaoqing Huang College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Department of Materials Science and Engineering & Department of Energy and Resources Engineering College of EngineeringPeking UniversityBeijing 100871China Testing & Analysis Center Soochow UniversitySuzhou 215123China

The control of the size, composition, and shape of platinum nanocrystals has attracted much attention recently, mostly due to their unique properties and related catalytic functionalities. However, the realization of platinum nanocrystals with controlled exposed facets and dimensionality remains a significant challenge. Herein, we show an efficient synthetic strategy to selectively prepare highly controllable platinum nanocrystals with distinct dimensionalities from onedimensional nanowires to zero-dimensional octahedra. Although the synthesis of platinum nanowires has been reported multiple times, the synthetic approach reported herein is much more novel and robust and ultimately results in high yields of high-quality platinum nanowires. Such dimensionality tuning on {111} facet dominated platinum nanocrystals allows us to firstly investigate the effect of the number of edges/corners on the electrocatalytic properties. Our results show that the synthesized platinum nanocrystals exhibit very interesting dimensionality-dependent electrocatalytic activity towards both the oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR), in which one-dimensional platinum nanowires with minimized edges/corners show enhanced electrocatalytic activities with respect to zero-dimensional platinum octahedra. Our dimensionality tuning also provides Pt nanowires with superior durability for the oxygen reduction reaction with negligible activity decay over the course of 30,000 potential sweeps. The present work highlights that the {111} facet bound platinum nanowires with minimized edges/corners are indeed promising candidates as electrocatalysts with excellent activity and superior durability. [Figure not available: see fulltext.] © 2016, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.

关键词： platinum nanowires octahedra {111} facet oxygen reduction reaction methanol oxidation reaction

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