Crystals
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2019
·Vol. 9
·期 5
·258
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IF 2.061
Hongdan Zhang,Ludan Zhu,Jun Cheng,Long Chen,Chuanqi Liu,Shuanglong Yuan
The Cs2SnX6perovskites have attracted much attention due to excellent optoelectronic properties and high stability. In the present work, we have focused on the morphology control and photoluminescence characteristics of the Cs2SnCl6perovskite crystals. The synthesis process of the Cs2SnCl6crystals includes two stages composed of the formation of initial crystals and the growth of Cs2SnCl6; the later originated from the oxidization of CsSnCl3. This process has been confirmed by Scanning electron microscope (SEM) and X-rays diffraction (XRD). By controlling the concentration of the initial reactants and hydrochloric acid in the solution to change the supersaturation of the solution, different crystal morphologies, such as truncated octahedron, octahedron, hexapod, quasi-sphere, have been obtained. In relatively a low supersaturation solution, the amount of growth units dominates the crystal growth process to obtain the hexapod and self-assembly crystals. In contrast, in relatively high supersaturation solution, nucleation predominates to yield small size truncated octahedrons and near-spherical Cs2SnCl6crystals. The synthesized Cs2SnCl6crystals have shown a wide emission band peaking at 450 nm with full width at half maximum (FWHM) 63 nm due to the defects introduced by Sn2+. The photoluminescence intensities of crystals synthesized at various conditions exhibited considerable difference, which was about 60 times between the highest and the lowest.Keywords:lead-free perovskite;Cs2SnCl6;crystal growth;photoluminescence
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Xingwen Liu,Qi Wang,Zhuo Wang,Xueting Liu,Minghui Zhang,Jiahui Fan,Zhiyong Zhou,Zhongqi Ren
A new type of Rb(I) ion imprinting material was prepared with methacrylic acid as functional monomer, Rb(I) ion as template, and methanol/acetonitrile as solvent. The polymerization reaction was initiated by N,N-azobis(isobutyronitrile) (AIBN) with the cross-linking by ethylene glycol dimethacrylate (EGDMA). In addition, benzo-12-crown-4-ether (B12C4) was introduced as a ligand to fix the template ions better. Scanning electron microscope, Zeta potential analysis, Fourier transform infrared spectrum, thermogravimetric analysis, and energy dispersive spectra were used for characterization of the imprinted polymer. Effects of preparation and adsorption conditions on adsorption performances of Rb(I) ion-imprinted polymers (IIPs) were investigated. The imprinted polymer had fast adsorption kinetics (reaching equilibrium within 15 min) and high maximum adsorption capacity (129.9 mg·g–1) at pH 9.5. Besides, the adsorption process conformed to pseudo-second-order kinetic and Freundlich isotherm models. Moreover, the prepared Rb(I)-IIPs showed high selectivity for Rb(I) ions. The results of eight repeated cycles of adsorption–desorption demonstrated that the prepared Rb(I)-IIPs had good stability and reusability.
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INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
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2018
·
IF 1.826
Bing Zhao,Xiaoyu Zhuang,Shu Liu,Zhiqiang Liu,Fengrui Song,Shuying Liu
Misfolding and dissociation of Cu, Zn-superoxide dismutase (SOD1) is closely related to the pathogenesis of Amyotrophic Lateral Sclerosis (ALS), so that, it is important to discover the compounds which can stabilize the structure of SOD1 for the prevention and treatment of ALS disease. Caffeoylquinic acids (CQAs), as potential antioxidants, are important bioactive components in multiple vegetables and fruits. In this research, we studied the interactions between the CQAs and SOD1, and explored their effects on stabilizing the SOD1 structure and inhibiting the misfolding of SOD1. Because metal-free SOD1 (apo-SOD1) may be one of the precursor compounds of SOD1 dissociation and aggregation, we investigated the non-covalent complex between CQAs and apo-SOD1 by the electrospray ionization mass spectrometry (ESI-MS) and tandem mass spectrometry (MS/MS). Among the CQAs observed in this research, dicaffeoylquinic acids (di-CQAs) have the stronger binding affinity to apo-SOD1 than monocaffeoylquinic acids (mo-CQAs). In order to study the interactions of di-CQA isomers with apo-SOD1, a novel method based on alkali metal assisted cationization-ion mobility mass spectrometry was established and used to investigate the binding affinity between the di-CQA isomers and apo-SOD1 by distinguishing and quantifying the unbound di-CQA. Collision induced unfolding (CIU), as a new methodology, was further used to assess the stabilities of di-CQAs and apo-SOD1 complexes. The results show that there were no distinct differences in the binding affinity between different di-CQA isomers and apo-SOD1. Furthermore, CIU data obtained in this work reveal that di-CQAs can stabilize apo-SOD1 dimer and retard the unfolding of apo-SOD1 dimer. The strategy developed by us can be also used to study the interactions between other isomeric compounds and target protein in order to discover more potential drug-like small molecules.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 39
·25476-25481
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IF 3.906
Shenglong Chu,Shusheng Pan,Guanghai Li
CsPbCl3 is a promising material to construct future short wavelength optoelectronic devices based on inorganic perovskite semiconductors. In this study, CsPbCl3 microcrystals were synthesized by a solution phase process. It was found that the photoluminescence (PL) intensities of the CsPbCl3 microcrystals can increase by up to five times under persistent irradiation of UV light without peak shifting, accompanied with an increased absorption coefficient above the band gap and decreased PL lifetime. This PL enhancement is a reversible process with excitation light switching on and off. The photoactivation process of the CsPbCl3 microcrystals is attributed to the passivation of the trap states.
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Science China-Chemistry
·
2019
·Vol. 62
·期 10
·1405-1413
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IF 6.085
Han Peigeng,Zhang Xue,Mao Xin,Yang Bin,Yang Songqiu,Feng Zhaochi,Wei Donghui,Deng Weiqiao,Pullerits Tõnu,Han Keli
Lead-free halide double perovskites have gathered wide scientific interest since they are environmentally friendly and stable. However, compared to the lead perovskites, their optoelectronic properties are compromised. Herein we report a series of bulk lead-free mixed Bi-In halide double perovskites: Cs 2 AgBi 1− x In x Cl 6 (0< x <1). The Cs 2 AgBi 0.125 In 0.875 Cl 6 breaks the parity-forbidden transition and retains direct band gap structure, having warm-white light emission, with photoluminescence quantum efficiency (PLQE) of 70.3%, much higher than the PLQE of reported lead perovskite materials. Its exciton self-trapping dynamics is investigated. Meanwhile, the Cs 2 AgBi 0.125 In 0.875 Cl 6 nanocrystals and Cs 2 AgBi 0.125 In 0.875 Cl 6 microcrystals can be synthesized by modified hot injection and rapid cooling crystallization, respectively. The size effect of Cs 2 AgBi 0.125 In 0.875 Cl 6 is studied on the photoluminescence (PL) property. Additionally, the bulk material exhibits excellent stability on exposure to light, humidity and air for more than 3 months. It is a promising candidate as highly efficient warm white-light emitting material for road lighting.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Mingcheng Li,Jingyu Zhao,Yaru Li,Meichen Li,Yongchuan Wu,Chun Wang,Han Jiao,Ping Na
Cesium ions (Cs + ) were absorbed using electrochemically switched ion exchange (ESIX) method based on Na 2 Ti 3 O 7 nanotubes , which were synthesized on surface of foam titanium plate by one-step hydrothermal method (TNT-F). SEM, TEM, XRD , Raman and XPS were used to characterize the TNT-F. During the adsorption process , the effects of adsorption potential, initial Cs + concentration, pH value and competing ions were investigated. It was found that the application of electric field force can effectively promote the adsorption process. Furthermore, pH value and competitive ions have a slight effect on the adsorption process. The desorption ability of TNT-F was also considered. The experimental results show that the desorption ratio also can be greatly improved by applying potential. In addition, TNT-F has a good reusability and reproducibility, it also has good adsorption performance under high concentration of competitive ions. In a word, the high performance TNT-F electrode which was easy to obtain in low cost is expected to become a promising material for Cs + collection.
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Small
·
2019
·Vol. 15
·期 44
·1903496
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IF 10.856
Qingsong Hu,Guangda Niu,Zhi Zheng,Shunran Li,Yanan Zhang,Haisheng Song,Tianyou Zhai,Jiang Tang
Recently, Bi-doped Cs 2 Ag 0.6 Na 0.4 InCl 6 lead-free double perovskites demonstrating efficient warm-white emission have been reported. To enable the solution processing and enrich the application fields of this promising material, here a colloidal synthesis of Cs 2 Ag 1− x Na x In 1− y Bi y Cl 6 nanocrystals is further developed. Different from its bulk states, the emission color temperatures of the nanocrystal can be tuned from 9759.7 to 4429.2 K by Na + and Bi 3+ incorporation. Furthermore, the newly developed nanocrystals can break the wavefunction symmetry of the self-trapped excitons by partial replacement of Ag + ions with Na + ions and consequently allow radiative recombination. Assisted with Bi 3+ ions doping and ligand passivation, the photoluminescence quantum yield of the Cs 2 Ag 0.17 Na 0.83 In 0.88 Bi 0.12 Cl 6 nanocrystals is further promoted to 64%, which is the highest value for lead-free perovskite nanocrystals at present. The new colloidal nanocrystals with tunable color temperature and efficient photoluminescence are expected to greatly advance the research progress of lead-free perovskites in single-emitter-based white emitting materials and devices.
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Journal of Materials Chemistry A
·
2017
·Vol. 6
·期 5
·2346-2352
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IF 8.867
Jun Zhou,Ximing Rong,Maxim S. Molokeev,Xiuwen Zhang,Zhiguo Xia
The electronic and optical properties of perovskites are related to the local structures of the compounds and define their functional applications. Herein we have prepared a double perovskite Cs2AgSbCl6, which crystallized in the cubic structure with the space group Fm-3m and the material is found to have a varied band gap associated with different body colors. The anti-site defect model was established to investigate transposition influence on the optical and electronic properties of the double-perovskite Cs2AgSbCl6, and the proposed model clearly explained the as-observed variable body color. Cs2AgSbCl6 perovskite has a high decomposition temperature and is stable upon prolonged exposure to air and moisture, which emphasize its potential in the field of photovoltaic absorbers and optoelectronic applications.
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JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
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2017
·Vol. 56
·期 6
·501-508
·
IF 2.838
Sha Wu,Xiangjun Gong,Geoffrey I. N. Waterhouse,Guangzhao Zhang
The effect of monovalent and divalent cations on the ssDNA to dsDNA transformation was systematically examined. For salts containing monovalent cations (LiCl, NaC1, KCl, CsCl), the conversion of ssDNA to dsDNA increased with ionic strength up to a value of I = 0.01 M and then plateaued, confirming that all four of the monovalent cations behaved similarly and promoted the formation of dsDNA. The monovalent cation type influenced the equilibrium constant for the conversion of ssDNA to dsDNA, indicating a degree of ion-specificity in dsDNA formation. In the case of salts containing divalent cations (e.g., MgCl 2 ), the conversion of ssDNA to dsDNA also increased with increasing ionic strength, though the plateau region was reached at a much lower ionic strength ( I = 5.0 × 10 −4 M), which can be attributed to the higher electrostatic screening efficiency of Mg 2+ cations and thus their superior ability to link DNA chains. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018 , 56 , 501–508
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CHEMISTRY OF MATERIALS
·
2017
·
IF 9.466
Bin-Wen Liu,Min-Yi Zhang,Xiao-Ming Jiang,Shu-Fang Li,Hui-Yi Zeng,Guo-Qiang Wang,Yu-Hang Fan,Yong-Fei Su,Chunsen Li,Guo-Cong Guo,Jin-Shun Huang
Two new polar polyselenides Rb4Ge4Se12 (1) and Cs4Ge4Se12 (2) with rarely reported dimeric [Ge2Se4(μ-Se2)]4– units were synthesized. They present large second-harmonic generation (SHG) intensities of 7.5 and 6.5 times that of the benchmark AgGaS2 with type I phase-matching behavior, high laser-induced damaged thresholds, a wide transmission region and congruently melting behavior, making them excellent candidates for IR nonlinear optical (NLO) applications. The SHG functional motifs of both compounds are determined to be [Ge2Se4(μ-Se2)]4– unit by time-dependent density functional theory calculation, which further reveals that charge transfers from the lone pairs of terminal Se atoms to the five σ* orbitals of five-membered ring Ge2Se3 have a predominant contribution to the total SHG effect.
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Advanced Optical Materials
·
2024
·
IF 8
Chaojun Yang,Xiangdan Tian,Guangguang Huang,Xinyang Xiong,Kaiwei Sun,Bo Zhang,Shujie Wang,Zuliang Du
Cesium zirconium halide (e.g., Cs2ZrCl6:Te or CZCT) perovskites have garnered significant interest due to their unique optical properties. However, there have been no reports of CZCT perovskite nanoparticles (PNPs) that simultaneously offer high efficiency and thermal stability. Here, a comprehensive defect suppression strategy is reported to achieve CZCT PNPs with these attributes. First, the inner defects of CZCT perovskite microcrystals (PMCs) are minimized by controlling crystallization kinetics precisely. Second, the PNPs are obtained from PMCs via top-down fabrication, and the surface defects of PNPs are passivated via the hydroxyl groups of alkyl-terminated silica-oligomer shell (ASO). The resulting CZCT@ASO PNPs show the highest photoluminescence quantum yield (PLQY) of 96% and high thermal stability among the reported conventional CZCT emitters. Finally, white light-emitting diodes (WLEDs) are integrated by using CZCT@ASO PNPs as the down-color converters, achieving a color coordinate of (0.31, 0.33) and a color rendering index of 86. These results demonstrate that core/shell CZCT@ASO PNPs have great potential as phosphors for lighting applications.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Jianhao Zheng,Pengye Du,Ran An,Yuan Liang,Yi Wei,Shuyu Liu,Xinyu Wang,Pengpeng Lei,Shuyan Song,Hongjie Zhang
Fluorescence thermometry based on metal halide perovskites is increasingly becoming a hotspot due to its advantages of high detection sensitivity, noninvasiveness, and fast response time. However, it still presents certain technical challenges in practical applications, such as complex synthesis methods, the use of toxic solvents, and being currently mainly based on the visible/first near-infrared light with poor penetration and severe autofluorescence. In this study, we synthesize the second near-infrared (NIR-II) luminescent crystals based on Yb3+/Nd3+-doped zero-dimensional Cs2ScCl5·H2O by a simple “dissolve–dry” method. The whole synthesized process does not involve high temperatures or high pressures. Cs2ScCl5·H2O/Yb3+,Nd3+ has an optimum fluorescence performance when the Yb3+/Nd3+ doping amount is 15%/20%. The emission intensity ratio attributed to Yb3+ and Nd3+ varies with temperature, and this variation is exacerbated due to the fact that the 2F5/2 energy level of Yb3+ can be effectively aligned with the O–H bond stretching vibration energy of coordinating water molecules to facilitate energy transfer. Ultimately, the crystals can act as self-referenced ratiometric NIR-II luminescent thermometers with a maximum relative sensitivity of 1.66% K–1 at 323 K. This work highlights the advantages of NIR-II luminescent materials for temperature sensing, which is significant for advancement in the field of noncontact thermometers.
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