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排序方式: 共有112条查询结果,搜索用时 31 毫秒
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Yi Liu Jiaqi Wang Shiguo Han Dr. Xitao Liu Maofan Li Zhiyun Xu Wuqian Guo Prof. Maochun Hong Prof. Junhua Luo Prof. Zhihua Sun 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(16):3494-3498
3D perovskite CsPbBr3 has recently taken a blooming position for optoelectronic applications. However, due to the lack of natural anisotropy of optical attributes, it is a great challenge to fulfil polarization-sensitive photodetection. Here, for the first time, we exploited dimensionality reduction of CsPbBr3 to tailor a 2D-multilayered hybrid perovskite, (TRA)2CsPb2Br7 ( 1 , in which TRA is (carboxy)cyclohexylmethylammonium), serving as a potential polarized-light detecting candidate. Its unique quantum-confined 2D structure results in intrinsic anisotropy of electrical conductivity, optical absorbance, and polarization-dependent responses. Particularly, it exhibits remarkable dichroism with the photocurrent ratio (Ipc/Ipa) of ≈2.1, being much higher than that of the isotropic CsPbBr3 crystal and reported CH3NH3PbI3 nanowire (≈1.3), which reveals its great potentials for polarization-sensitive photodetection. Further, crystal-based detectors of 1 show fascinating responses to the polarized light, including high detectivity (>1010 Jones), fast responding time (≈300 μs), and sizeable on/off current ratios (>104). To our best knowledge, this is the first study on 2D Cs-based hybrid perovskite exhibiting strong polarization-sensitivity. The work highlights an effective pathway to explore new polarization sensitive candidates for hybrid perovskites and promotes their future electronic applications. 相似文献
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Jindou Tian Prof. Dr. Qihui Chen Prof. Dr. Feilong Jiang Prof. Dr. Daqiang Yuan Prof. Dr. Maochun Hong 《Angewandte Chemie (International ed. in English)》2023,62(7):e202215253
Developing practical storage technologies for acetylene (C2H2) is important but challenging because C2H2 is useful but explosive. Here, a novel metal–organic framework (MOF) ( FJI-H36 ) with adaptive channels was prepared. It can effectively capture C2H2 (159.9 cm3 cm−3) at 1 atm and 298 K, possessing a record-high storage density (561 g L−1) but a very low adsorption enthalpy (28 kJ mol−1) among all the reported MOFs. Structural analyses show that such excellent adsorption performance comes from the synergism of active sites, flexible framework, and matched pores; where the adsorbed-C2H2 can drive FJI-H36 to undergo induced-fit transformations step by step, including deformation/reconstruction of channels, contraction of pores, and transformation of active sites, finally leading to dense packing of C2H2. Moreover, FJI-H36 has excellent chemical stability and recyclability, and can be prepared on a large scale, enabling it as a practical adsorbent for C2H2. This will provide a useful strategy for developing practical and efficient adsorbents for C2H2 storage. 相似文献
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Ding Qingran Zhang Xingyu Lin Zheshuai Xiong Zheyao Wang Yusong Long Xifa Zhao Sangen Hong Maochun Luo Junhua 《中国科学:化学(英文版)》2022,65(9):1710-1714
Science China Chemistry - As structural variants of famous hexagonal tungsten bronzes, hexagonal tungsten oxides (HTO) represent an important family with fascinating functional properties, such as... 相似文献
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稀土掺杂上转换发光纳米材料作为一种新型的荧光材料,因其发光性能优异、化学性质稳定以及自发荧光干扰小等优点受到国内外研究者的广泛关注。如何实现稀土上转换发光性能的可控调节一直是稀土纳米发光材料研究中的一个热点问题。简要总结了近年来关于局域结构依赖的稀土上转换发光性能的研究进展,分别从结构设计和晶体结构调节两个方面展开,主要内容包括核壳结构、复合结构和孔洞结构的设计对稀土上转换发光性能的影响及晶体结构对稀土上转换发光强度和上转换发光红绿比的影响,以期为制备高质量、可定制上转换发光性质的稀土掺杂纳米发光材料提供参考。 相似文献
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目前,手性配体辅助钯催化的区域和对映选择性碳氢键活化是过渡金属催化的前沿领域.在过去的十年中,它作为一种越来越重要的合成工具,用于合成含有各种不对称元素(中心手性、轴手性和平面手性)的手性分子,也是快速构建各种碳碳键和碳杂原子键的最有效方法之一.本文介绍了一些典型手性配体在钯催化不对称sp2和sp3碳氢键活化/官能团化反应中的应用,如单齿配体亚磷酰胺、手性磷酸(CPAs)和双功能氮端单保护的氨基酸(MPAAs)配体;探讨了这些手性配体辅助催化反应的创新性和特点,在理清这一研究领域发展脉络的同时,展望了未来研究工作的方向.此外,本文还介绍了这一不对称合成策略在天然产物、药物分子全合成中的应用. 相似文献
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Pd nanoparticles have been successfully supported on nanoscale metal-organic frameworks (NMOFs) by using a simple and effective microwave-assisted impregnation process. The resulting composite, representing as a highly active NMOFs supported metal nanoparticles catalyst for the Suzuki cross-coupling reaction between aryl/heteroaryl halides and arylboronic acids, is well characterized, and its high activity and good recyclability are discussed in details. It reveals that, compared to the corresponding bulk MOFs and conventional active carbon materials, nanoscale MOFs as novel support materials for heterogeneous catalysts can exhibit superior performance in the catalytic reactions. 相似文献
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Shuai Liu Xiaomeng Liu Sangen Zhao Youchao Liu Lina Li Qingran Ding Yanqiang Li Zheshuai Lin Junhua Luo Maochun Hong 《Angewandte Chemie (International ed. in English)》2020,59(24):9414-9417
Birefringent materials, which can modulate the polarization of light, are almost exclusively limited to oxides. Peroxides have long been overlooked as birefringent materials, because they are usually not stable in air. Now, the first peroxide birefringent material Rb2VO(O2)2F is reported, the single crystals of which keep transparency after being exposed in the air for two weeks. Interestingly, Rb2VO(O2)2F does not feature an optimal anisotropic structure, but its birefringence (Δn=0.189 at 546 nm) exceeds those of the majority of oxides. According to the first‐principles calculations, this exceptional birefringence should be attributed to the strong electronic interactions between localized π orbital of O22? anions and V5+ 3d orbitals, which may be also favorable to the stability in the air for Rb2VO(O2)2F. These findings distinguish peroxides as a brand‐new class of birefringent materials that may possess birefringence superior to the traditional oxides. 相似文献
10.
Wuqian Guo Xitao Liu Shiguo Han Yi Liu Zhiyun Xu Maochun Hong Junhua Luo Zhihua Sun 《Angewandte Chemie (International ed. in English)》2020,59(33):13879-13884
Although two‐dimensional (2D) metal–halide double perovskites display versatile physical properties due to their huge structural compatibility, room‐temperature ferroelectric behavior has not yet been reported for this fascinating family. Here, we designed a room‐temperature ferroelectric material composed of 2D halide double perovskites, (chloropropylammonium)4AgBiBr8, using an organic asymmetric dipolar ligand. It exhibits concrete ferroelectricity, including a Curie temperature of 305 K and a notable spontaneous polarization of ≈3.2 μC cm?2, triggered by dynamic ordering of the organic cation and the tilting motion of heterometallic AgBr6/BiBr6 octahedra. Besides, the alternating array of inorganic perovskite sheets and organic cations endows large mobility‐lifetime product (μτ=1.0×10?3 cm2 V?1) for detecting X‐ray photons, which is almost tenfold higher than that of CH3NH3PbI3 wafers. As far as we know, this is the first study on an X‐ray‐sensitive ferroelectric material composed of 2D halide double perovskites. Our findings afford a promising platform for exploring new ferroelectric materials toward further device applications. 相似文献