CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
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2022
·
IF 0.847
Qing Yao,Kaiyu Wang,Jie Zhang,Changqian Li,Chenyu Shang,Feitong Chen,Qi Huang,Qiqi Zhao,Weiwei Zhang,Xiaoyuan Zhan,Jianxu Ding
ABSTRACT Introducing inorganic cation into hybrid organic-inorganic perovskites (HOIPs) has attracted great attention because of the enhancement stabilities without sacrificing their excellent optoelectronic properties. Here, we introduce Cs and Rb into MAPbI 1.8 Br 1.2 single crystals (SCs) to dig out the mixed cation effect on optoelectronic performances and phase stabilities. Both Rb and Cs can increase the lattice capacity, which is sufficient to relieve the lattice stress caused by photon energy, thus achieving the purpose of stabilizing the lattice structure and inhibiting migration of halide ions, compared with MAPbI 1.8 Br 1.2 SC. On the other hand, the smaller polarity of Rb and Cs reduces the electron-phonon coupling, thus significantly inhibiting the migration of halide ions. Meanwhile, through planar photo-detectors, MA 0.9 Cs 0.1 PbI 1.8 Br 1.2 -based device behaves much excellent optoelectronic performance (R = 0.170 A/W, EQE = 51.39 %, D* = 4.42 × 10 12 Jones, on/off ratio: ~522).
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Journal of the American Chemical Society
·
2022
·
IF 16.383
Chuying Ye,Jiawei Jiang,Shaolan Zou,Wenbo Mi,Yin Xiao
We developed type-II core–shell nanocrystals (NCs) with a chiral low-dimensional perovskite shell and an achiral 3D MAPbBr3 core. The core–shell NCs exhibit spin-polarized luminescence at the first excitation band of the achiral core, which is due to the chiral-induced spin selectivity (CISS) effect-governed spin-dependent shell-to-core electron transportation and the subsequent electron–hole recombination in the core. The preferred spin state of the transferred electrons is determined by the handness of the chiral shell. For the core–shell NCs film, a photoluminescence quantum yield (PLQY) of 54% and a circularly polarized luminescence (CPL) with a maximum |glum| of 4.0 × 10–3 are obtained at room temperature. Finally, we achieved a spin-polarized light-emitting diode (spin-LED), affording a circularly polarized electroluminescence (CP-EL) with a |gCP-EL|of 6.0 × 10–3 under ambient conditions.
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JOURNAL OF CHEMICAL PHYSICS
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2022
·Vol. 157
·期 8
·
IF 4.304
Chen Zhongwei,Liu Yang,Gong Shaokuan,Zhang Zixuan,Cao Qinxuan,Mao Lingling,Chen Xihan,Lu Haipeng
Low-dimensional metal halide perovskites are attracting extensive attention due to their enhanced quantum confinement and stability compared to three-dimensional perovskites. However, low dimensional connectivity in the inorganic frameworks leads to strongly bounded excitons with limited absorption properties, which impedes their application in photovoltaic devices. Here, we show that, by incorporating a strong electron accepting methylviologen cation, charge transfer (CT) at the organic/inorganic interface can effectively tune the optical properties in one-dimensional (1D) lead–halide perovskites. Both 1D MVPb 2 I 6 and MVPb 2 Br 6 display expanded absorption and photoresponse activity compared to CT inactive cations. The photoinduced CT process in MVPb 2 I 6 was further characterized by transient absorption spectroscopy, which shows an ultrafast CT process within 1 ps, generating charge separated states. Our work unveils the interesting photophysics of these unconventional 1D perovskites with functional organic chromophores.
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TALANTA
·
2022
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IF 6.556
Hongbo Wang,Jing Wang,Qian Li,Jianxiu Du
A dual-emission fluorescent nanoprobe was successfully constructed through self-assembling CsPbBr 3 perovskite nanocrystals (CsPbBr 3 PNCs) and tetraphenylporphyrin tetrasulfonic acid (TPPS). Acetylcholinesterase (AChE) is observed to directly quench the green fluorescence of CsPbBr 3 PNCs at 520 nm in the absence of an enzyme substrate, but has no significant influence on the red emission of TPPS at 650 nm. The decreased value of the fluorescence intensities ratio at 520 to 650 nm (ΔF 520 /F 650 ) is proportional to the logarithmic value of AChE activity ranging from 0.05 to 1.0 U/L. The limit of detection is as low as 0.0042 U/L. The relative standard deviation is 3.6% in eleven consecutive measurements of 0.2 U/L AChE. The method exhibits a good anti-interference capacity since it does not respond to most concomitant species. Satisfactory results are acquired for the determination of AChE activity in human serum samples.
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高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2022
·Vol. 2022
·期 23
·e202200275
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IF 2.551
Zhiyu Wang,Zixuan Zhang,Herman H. Y. Sung,Ian D. Williams,Haipeng Lu
Graphical This study reports six new chiral antimony halide hybrids, including four zero-dimensional (0D, A 4 Sb 2 X 10 , A=( R )-(+)-α-methylbenzylammonium ( R -MBAH + ) or ( R )-(−)-1-cyclohexylethylammonium ( R -CHEAH + ), X=Br, I) and two one-dimensional (1D, A’ 2 SbX 5 , A’=( R )-(+)-α-ethylbenzylammonium ( R -EBAH + ); X=Br, I) compounds. The chirality transfer mechanism and structure-activity relationship were revealed at the molecular scale by analyzing their structure and chiroptical properties. Chiral metal-halide hybrids have aroused widespread attention owing to their chemical and structural versatilities as well as unique optoelectronic and spin-dependent properties. Several recent experiments have shown that organic chirality results in circularly polarized absorption and emission from the inorganic metal-halide subcomponent; however, the exact structure chirality transfer mechanism and structure-optical-activity relation remain elusive. Here, we demonstrate how chiral organic cations lead to local structural asymmetry in a new series of chiral antimony-halide hybrids, including zero-dimensional edge-shared (0D, A 4 Sb 2 X 10 , A=( R )-(+)-α-methylbenzylammonium ( R -MBAH + ) or ( R )-(−)-1-cyclohexylethylammonium ( R -CHEAH + ), X=Br, I) and one-dimensional corner-shared (1D, A’ 2 SbX 5 , A’=( R )-(+)-α-ethylbenzylammonium ( R -EBAH + ); X=Br, I). Structure analysis shows that organic ammoniums distort the antimony-halide octahedra through asymmetric hydrogen bonding. The chiroptical activity is correlated with the exciton coupling strength, which can be tuned by the structural dimensionality. Our study unveils the molecular scale chirality transfer mechanism in these chiral metal-halide hybrids.
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Energy & Environmental Materials
·
2022
·
IF 13.443
Xieming Xu,Yiheng Wu,Yi Zhang,Xiaohui Li,Fang Wang,Xiaoming Jiang,Shaofan Wu,Shuaihua Wang
Scintillation semiconductors play increasingly important medical diagnosis and industrial inspection roles. Recently, two-dimensional (2D) perovskites have been shown to be promising materials for medical X-ray imaging, but they are mostly used in low-energy (≤130 keV) regions. Direct detection of MeV X-rays, which ensure thorough penetration of the thick shell walls of containers, trucks, and aircraft, is also highly desired in practical industrial applications. Unfortunately, scintillation semiconductors for high-energy X-ray detection are currently scarce. Here, This paper reports a 2D (C 4 H 9 NH 3 ) 2 PbBr 4 single crystal with outstanding sensitivity and stability toward X-ray radiation that provides an ultra-wide detectable X-ray range of between 8.20 nGy air s −1 (50 keV) and 15.24 mGy air s −1 (9 MeV). The (C 4 H 9 NH 3 ) 2 PbBr 4 single-crystal detector with a vertical structure is used for high-performance X-ray imaging, delivering a good spatial resolution of 4.3 lp mm −1 in a plane-scan imaging system. Low ionic migration in the 2D perovskite enables the vertical device to be operated with hundreds of keV to MeV X-ray radiation at high bias voltages, leading to a sensitivity of 46.90 μC Gy air −1 cm −2 (−1.16 V μm −1 ) with 9 MeV X-ray radiation, demonstrating that 2D perovskites have enormous potential for high-energy industrial applications.
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DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 34
·12996-13002
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IF 4.569
Wenjing Jiang,Yi Xu,Li Wang,Li Chen,Shunbo Li
Mercury(II) is one of the most toxic ions and has the lowest allowed concentration in water. Lowering the detection limits of Hg2+ based on fluorescence methods is challenging compared to the detection of other heavy metal ions. Co-precipitation of the CsPbBr3 precursor and mercury ions in aqueous solutions was developed for the ultra-trace level detection of Hg2+. It was found that the formed CsPbBr3 crystals with sizes in the range of nanometers to micrometers exhibited strong fluorescence in the solid state free of water, and the incorporation of Hg2+ in the crystals would cause fluorescence quenching. Therefore, the decrease in fluorescence intensity could be used to quantitatively detect Hg2+. A microwell array was designed by dispersing the sample solution with the perovskite probe and evaporating water for 3 min to form solid fluorescent crystals, leading to the incorporation of Hg2+ in the crystals. This evaporation-induced co-precipitation strategy successfully solved the problem of the instability of perovskite materials in water. The concentration of Hg2+ can be obtained according to the decrease in the fluorescence intensity, which is caused by the replacement of Pb2+ by Hg2+ in the crystals during the crystallization process. The CsPbBr3 crystallites can be used to detect ultra-trace levels of Hg2+ simply and quickly, with a linear range of 5–100 nM and limit of detection (LOD) as low as 0.1 nM. More importantly, no organic molecules are required to prepare crystals since the micron-sized crystals have obvious fluorescence. This method demonstrates great promise in detecting low concentrations of Hg2+ in aqueous solutions.
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Gels
·
2022
·Vol. 8
·期 8
·476
·
IF 4.432
Chengju Sheng,Xuemei Tan,Qing Huang,Kewen Li,Chao Zhou,Mingming Guo
Wounds, particularly under low-hydration conditions, require more time to repair successfully. Therefore, there is an urgent need to develop wound dressings that can accelerate wound healing. Hydrogels, which can maintain a moist environment around the wound and allow gas to pass through the material, act as antibacterial hydrogels as dressings and have great application value in the treatment of wounds. In addition, wound dressings (hydrogels) containing antibacterial capacity have lasting antibacterial effects and reduce damage to cells. In this work, we firstly synthesized two antibacterial agents: imidazolium poly(ionic liquids) containing sulfhydryl (Imidazole-SH) and ε-Poly(lysine) containing SH (EPL-SH). Then, lysine as a cross-linking agent, by “thiol-ene” click reaction, was mixed with Deferoxamine (DFO) to prepare the antibacterial hydrogels. The in vitro assays showed that the hydrogels could effectively killEscherichia coli(E. coli) andStaphylococcus aureus(S. aureus). In addition, it also could reduce the inflammatory response produced by Lipopolysaccharide (LPS). More importantly, according to the transwell and angiogenesis assays, DFO-incorporated hydrogels promoted the migration and vascular repair of human umbilical vein endothelial cells (HUVECs). All the results revealed that the hydrogels provided new strategies for wound dressings.Keywords:antibacterial hydrogels;imidazolium poly(ionic liquids);vascular repair;anti-inflammatory;deferoxamine
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Asian Journal of Organic Chemistry
·
2022
·Vol. 11
·期 8
·e202200234
·
IF 3.116
Yifei Ye,Yanglin Chen,Junzhe Huang,Jianmin Sun
Graphical A series of functionalized ionic liquids (ILs) immobilized on B-doped mesoporous SiO 2 catalysts were fabricated for effectively converting CO 2 into cyclic carbonates under metal-absent and cocatalyst-free conditions A series of functionalized ionic liquids (ILs) immobilized on B-doped mesoporous SiO 2 catalysts were fabricated for effectively converting CO 2 into cyclic carbonates under metal-absent and cocatalyst-free conditions. Functionalized imidazolium ILs were in-situ synthesized by Debus-Rdziszewski imidazole reaction. Among the prepared catalysts, 5B−SiO 2 −NH 2 −3−I catalyst owing to the synergistic effects of nucleophile, Lewis acid-base and hydroxyl hydrogen bond donors in the catalyst, presented the better catalytic activity for propylene epoxide to the product of propylene carbonate with 99% yield and selectivity at 110 °C and 2 MPa CO 2 . The catalyst also displayed moderate yield for various mono-substituent epoxides. Besides, the gradual decline in the product yield during consecutive runs could be easily refreshed by aqueous acidic solution washing.
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JOURNAL OF LUMINESCENCE
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2022
·
IF 4.171
Chen Li,Jun'an Lai,Daofu Wu,Qiang Wang,Yanjun Bai,Peng He,Kang An,Xiaosheng Tang
Metal halide with high luminescence property have emerged as the novel candidate materials for X-ray detection and imaging. However, the toxicity of some metal cations , such as Pb 2+ , limits its further widespread application. In this work, a new of lead-free pyridine manganese halide (C 5 H 6 N) 2 MnBr 4 was synthesized by the solution-processed method in room temperature . The research results show (C 5 H 6 N) 2 MnBr 4 has a typical structure of tetrahedral coordination related to d-d transition, which has a strong green emission at 520 nm with a full width at half maximum (FWHM) of 45 nm. (C 5 H 6 N) 2 MnBr 4 exhibits high photoluminescence quantum yields (PLQYs) of 59.36%, appreciable light yield of 15400 photons/MeV which is much higher than lead halide, relative short PL decay lifetime (247 μs) which is shorter than previous reported manganese halide and ultrashort RL decay time (12.24 ns). Finally, the performance of (C 5 H 6 N) 2 MnBr 4 Scintillators was verified via X-ray imaging, and clear X-ray image was obtained. (C 5 H 6 N) 2 MnBr 4 scintillators are eco-friendly and easy-synthesize while it has many superior performances: large stokes shift to reduce self-absorption of light; high PLQY to enhance scintillation performances; short decay lifetime to improve response. Thus, (C 5 H 6 N) 2 MnBr 4 shows great potential as next generation of scintillators and this work provides a new way for the preparation of simple and low-cost metal halide scintillators.
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CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Lei Ge,Yang Wang,Xiang Gao,Min Li,Runqi Zhang,Siyu Liu,Yihang Yu,Mingguang Li,Ligang Xu,Ye Tao,Runfeng Chen,Wenzhen Lv
Ultralong room-temperature phosphorescence (URTP) has attracted widespread attention in modern optoelectronics, but it is mainly observed in organic materials through deliberate molecular design. Here, we report efficient URTP emission from two-dimensional (2D) perovskites by stabilizing the triplet excitons of organic cations energetically in a type I hybrid quantum-well-like structure and structurally in a 2D layered gallery. Such a dual-mode cooperative stabilization strategy is realized facilely by the methoxyl group modification of π-conjugated phenethylammonium cation, which has little influence on the 2D perovskite architecture. Moreover, a strong URTP (∼490 nm) with a remarkably long lifetime of up to 480 ms and quantum yield of 7.86% are achieved, along with excellent environmental robustness against moisture and oxygen invasion and good thermal stability in a wide range of temperatures. Furthermore, both multiple information encryption and afterglow white lighting devices are realized, greatly expanding the development of hybrid perovskite phosphors for advanced 2D URTP materials and applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Lijun Wu,Song Zheng,Heng Lin,Shun Zhou,Ahmed Mahmoud Idris,Jin Wang,Sheng Li,Zhengquan Li
All-inorganic lead-free halide double perovskites have emerged as rising star photocatalysts to substitute the toxic lead-based hailed perovskites (LHPs) owing to their unique photophysical properties. Nevertheless, their photocatalytic activities toward CO 2 reduction are still far from comparable with the LHPs, associated with severe charge recombination and sluggish surface catalytic reaction . Herein, a delicate 0D/2D heterojunction of Cs 2 AgBiBr 6 /Bi 2 WO 6 (CABB/BWO) was assembled by in-situ growing cubic CABB nanocrystals on the flat surface of BWO nanosheets via a facile hot-injection method. Density functional theory (DFT) calculations disclose that the work function and Fermi level difference between CABB and BWO give rise to charge redistribution at the interface upon the formation of the heterojunction, creating an internal electric field (IEF). Upon light irradiation , the IEF enables the photogenerated electron transfer from BWO to CABB via direct Z-scheme electron transfer mode with striking spatial charge separation as verified by in-situ X-ray photoelectron (XPS) and electron spin resonance (ESR) spectra. Consequently, the CABB/BWO heterojunction realizes 7-fold higher photocatalytic activity than pristine CABB with significant electron consumption rate of 87.66 µmol g -1 h −1 under simulated solar light (AM 1.5G).
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