ACS Nano
·
2021
·
IF 15.881
Jingjie Wu,Xianli Li,Xin Lian,Binbin Su,Junhong Pang,Ming-De Li,Zhiguo Xia,Jin Z. Zhang,Binbin Luo,Xiao-Chun Huang
Antimony-based metal halide hybrids have attracted enormous attention due to the stereoactive 5s2 electron pair that drives intense triplet broadband emission. However, energy/charge transfer has been rarely achieved for Sb3+-doped materials. Herein, Sb3+ ions are homogeneously doped into 2D [NH3(CH2)4NH3]CdBr4 perovskite (Cd-PVK) using a wet-chemical method. Compared to the weak singlet exciton emission of Cd-PVK at 380 nm, 0.01% Sb3+-doped Cd-PVK exhibits intense triplet emission located at 640 nm with a near-unity quantum yield. Further increasing the doping concentration of Sb3+ completely quenches singlet exciton emission of Cd-PVK, concurrently with enhanced Sb3+ triplet emission. Delayed luminescence and femtosecond-transient absorption studies suggest that Sb3+ emission originates from exciton transfer (ET) from Cd-PVK host to Sb3+ dopant, while such ET cannot occur with Pb2+-doped Cd-PVK because of the mismatch of energy levels. In addition, density function theory calculations indicate that the introduced Sb3+ likely replace the Cd2+ ions along with the deprotonation of butanediammonium for charge balance, instead of generating Cd2+ vacancies. This work provides a deeper understanding of the ET of Sb3+-doped Cd-PVK and suggests an effective strategy to achieve efficient triplet Sb3+ emission beyond 0D Cl-based hybrids.
研究领域:
材料科学
·
光电学
·
化学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULES
·
2024
·
IF 5.1
Zhenzhen Yang,Jiahui Cai,Zitong Shen,Jiaqi Bian,Jiashang Chen,Yao Xu,Zecheng Fang,Congkun Du,Xing Xiang,Juan Wang,Peng Yu,Ruiyao Cui,Siwen Bi
Carbonyl-containing polymers have been considered promising candidates as hosts in solid polymer electrolytes (SPEs) due to the reasonable chelating coordination with Li+, better antioxidation for high-voltage cathodes, and higher ion transference number compared with polyether SPEs. In this work, four polyesters of poly(octamethylene succinate), poly(hexmethylene succinate) (PHS), poly(butylene succinate), and polycaprolactone were investigated. In these SPEs with different −C═O/–CH2– ratios, PHS had the highest conductivity (σ) of 1.24 × 10–4 S/cm because of the excellent ability to deionize bis(trifluoromethane)sulfonimide (LiTFSI) up to 88.3 ± 3.2% at 70 °C and the lowest activation energy of Li+ ionic conduction. The effect of Li+/–C═O ratios (r) on the ionic conductivity can be clarified into low-, middle-, and high-concentrated regions. The decrease of PHS crystallinity due to LiTFSI solvation provided ion transport paths and mainly contributed to the improvement of ionic conductivity in the middle-concentrated region, while the solvation degree dominantly facilitated ionic conduction in the high-concentrated region and at higher temperatures. By combining the DFT simulation and polymer thermal analysis, we found the transition of Li+ coordination from multichain to single-chain bindings provided more flexible segment movement. It also proved that the sequence design of active groups in a polymer chain would be a promising strategy for stable and high-performance SPEs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Jialin Zeng,Shuangcheng Li,Yahui Zhu,Zilong Geng,Yiting Luo,Ruibiao Fu,Zuju Ma
Nonlinear optical (NLO) crystals are of importance in modern lasers, high-precision micromachining, ultrahigh resolution photolithography and advanced scientific equipment. Herein, we have rationally obtained two new lead oxybromides, A3[Pb2Br5(OOC(CH2)3COO)] (A = Rb, Cs), with a strong second-harmonic generation (SHG) response and large birefringence. Two neighboring highly distorted [PbBr4O2] polyhedrons with high polarizability and anisotropic polarization are bridged by the flexible glutarate group and one Br− anion to form a large [Pb2Br7(OOC(CH2)3COO)] group. Interestingly, the large [Pb2Br7(OOC(CH2)3COO)] groups are induced by Rb+/Cs+ cations into an oriented alignment, leading to the effective superimposition of their microscopic second-order susceptibility and the enhancement of optical anisotropy. Notably, Rb3[Pb2Br5(OOC(CH2)3COO)] exhibits good comprehensive NLO performance, including a strong phase-matching SHG response of 3.1 × KDP, a large birefringence of 0.207@546 nm, a wide high transparency window, easy growth of large single crystals, as well as good thermal stability up to 240 °C under an air atmosphere. On the basis of their crystal structures and theoretical calculations, their strong SHG responses mainly stem from the highly distorted [PbBr4O2] polyhedron. This research provides an effective strategy for the design and pursuit of high-performance NLO crystals in the future.
研究领域:
材料科学
·
光学
·
晶体学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Dehai Liang,Xin Lian,Xianli Li,Binbin Luo
Two dimensional (2D) hybrid metal halide perovskites (MHPs) with broadband emission have attracted enormous attention, which is highly promising for single-component solid state lighting. However, it remains a challenge to unveil the underlying origin of broadband emission and achieve high quantum yield (QY). Herein, 2D single-layered [NH 3 (CH 2 ) 4 NH 3 ]CdBr 4 (Cd–P) has been successfully prepared. By partially replacing Cd 2+ with Pb 2+ , the energy band of Cd–P shows a transformation from indirect to direct, supported by the density functional theory (DFT) calculations. Benefiting from the change of energy band, alloyed Cd x Pb 1-x -P shows an intensive broadband emission spanning the whole visible range with a maximum of photoluminescence (PL) QY of 58%. Temperature-dependent and time-resolved PL uncover that the broadband emission origins from the coupling between free excitons (FEs) and [CdBr 6 ] 4- octahedra , instead of [PbBr 6 ] 4- . These findings provide a deep insight into the origin of STEs emission and an effective approach to promote the broadband emission for Cd-based MHPs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ANALYTICAL SCIENCES
·
2024
·
IF 1.8
Wang Jun,Yang Hai-yan,Fan Jia-jia,Xu Zi-Han,Pang Zai-hui,Feng Yuan,Wei Na
To develop a clean-up material suitable for high-fat food matrices for detecting mycotoxins in yak ghee, an octadecyl-bonded hectorite (Hectorite@NHCO(CH 2 ) 17 CH 3 ) was synthesized through multi-step chemical reactions. A modified QuEChERS–HPLC–MS/MS method for detecting ten mycotoxins in sesame oil in yak ghee was established using Hectorite@NHCO(CH 2 ) 17 CH 3 as clean-up agent. It involved extracting mycotoxin contaminants using acidified acetonitrile and employing the Hectorite@NHCO(CH 2 ) 17 CH 3 to remove interfering substances from the extract. The purified samples were then analyzed using HPLC–MS/MS. Within a linear range of 1.0–500 μg/kg, there was a good linear relationship between the quantification ion peak area of the target analytes and the corresponding concentrations ( R 2 ≥ 0.9991). The limit of detection (LOD) ranged from 0.10 μg/kg to 18.62 μg/kg and the limit of quantitation (LOQ) ranged 0.32–62.07 μg/kg. The recoveries at low, medium and high concentrations (25, 100 and 500 μg/kg) ranged from 72.2% to 113.9%, with relative standard deviations (RSD) between 3.2% and 17.5%. The intra-day and inter-day precision met experimental requirements. The proposed method was characterized by a high accuracy and precision, and it could cater to the current demand for detecting ten mycotoxins in yak ghee. Graphical abstract
研究领域:
食品安全
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTEGRATED FERROELECTRICS
·
2018
·
IF 0.367
Xiaolei Song,Yuan Yu,Chunxia Wang,Mingqiao Ge
Magnetic nanoparticles of Nd-Fe3O4 were prepared by hydrothermal synthesis method, using NdCl3·6H2O and FeCl3·6H2O as the starting materials in this paper. The structure and morphology of nanoparticles were investigated by XRD, FTIR, EDS and TEM. The results showed that, while the addition of Nd at 10% in mole ratio, resulted in the formation of Nd2O3 crystal peak in cubic Fe3O4 nanocrystallites by XRD. The absorption bands of Fe‒O, ‒OH, ‒O‒C‒O‒ and ‒CH2‒ were accordant to the correspondent chemical groups by FTIR. The morphology of the prepared nanoparticles exhibited spherical structure and evenly distributed without agglomeration phenomenon by TEM. The elemental composition were mainly consistent with the precursor materials used in the experiment.
研究领域:
材料科学
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Jiaojiao Cao,Chengbin Guo,Zhenyu Chen
A series of MOF-5 @BTA-X (X = -CH 3 /-NH 2 /-CO(CH 2 ) 6 CH 3 ) anticorrosion composites was fabricated through loading benzotriazole derivatives in a metal–organic framework (i.e., MOF-5). Their crystal structures and morphologies were characterized by single-crystal X-ray diffraction analysis, Fourier transform infrared spectroscopy , and transmission electron microscopy . The loading–releasing mechanisms between MOF-5 and BTA derivatives were revealed by experiments and theoretical calculations. Their anticorrosion performance for copper was also evaluated by electrochemical impedance spectroscopy and potentiodynamic polarization in 0.5 M NaCl. The corrosion product was analyzed via scanning electron microscopy and X-ray photoelectron spectroscopy. The results indicated that the loading capacities followed the order of MOF-5 @BTA-NH 2 > MOF-5 @BTA-CH 3 > MOF-5 @BTA-CO(CH 2 ) 6 CH 3 . The release rates followed the order of MOF-5 @BTA-NH 2 < MOF-5 @BTA-CH 3 < MOF-5 @BTA-CO(CH 2 ) 6 CH 3 . Furthermore, the results of theoretical calculations indicated that the differences in loading capacities depended on the polarity of the functional group. Meanwhile, the strong binding force decreased the release rate.
研究领域:
材料科学
·
腐蚀防护
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纳米复合材料
·
理论化学
·
电化学
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Xin Zhang,Yiming Zhao,Wenjuan Li,Yun Zhang,Siyu Xu,Sen Xu,Wen Zhou,Yizheng Fu,Yongan Feng,Weiguo Cao
Higher fatty alcohols play a vital position in modern industry, while the dust explosion hazard cannot be ignored. Three kinds of linear monohydric alcohols CH 3 (CH 2 ) n-1 OH (n = 16, 18, 22) were selected to explore the combustion characteristics through ignition tests and molecular dynamics simulations. The experiment consequences indicated that the flame propagation height of alcohols dust gradually aggrandized as the enlargement of dust concentration of 30–750 g/m 3 and the flame propagation velocity presented two peaks. CH 3 (CH 2 ) 15 OH had the highest flame propagation height and velocity, followed by CH 3 (CH 2 ) 17 OH and CH 3 (CH 2 ) 21 OH. The first flame propagation velocities of CH 3 (CH 2 ) 15 OH, CH 3 (CH 2 ) 17 OH, and CH 3 (CH 2 ) 21 OH reached the maximum value at 500 g/m 3 , which were 16.47, 13.25, and 12.53 m/s, respectively. The second peak reached the maximum value at 750 g/m 3 , which were 20.07, 19.05, and 18.23 m/s, respectively. The combustion reactions of alcohols revealed that the decomposition of molecules was first due to the breakage of the C C bond, and the main products were mainly C 2 H 4 , H 2 O, CH 2 O, CO, and CO 2 . The production and consumption reaction processes of C 2 H 4 , CH 2 O, and other combustible gas products reasonably explained the flame continuous process and the variation of flame propagation. The TG test results indicated that the volatility and thermal conductivity of CH 3 (CH 2 ) 15 OH, CH 3 (CH 2 ) 17 OH, and CH 3 (CH 2 ) 21 OH decreased sequentially, which confirmed the flame propagation and molecular dynamics combustion reactions of the three alcohols. The volatility of alcohols was the key factor determining the difference in the flame propagation behavior of alcohols dust.
研究领域:
化学工程
·
安全科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Da Chen,Shiqiang Hao,Liubing Fan,Yangwu Guo,Jiyong Yao,Christopher Wolverton,Mercouri G. Kanatzidis,Jing Zhao,Quanlin Liu
Recent discoveries in organic−inorganic metal halides reveal superior semiconducting and polarization properties. Herein, we report three organic–inorganic metal halides, (PBA)4BiBr7·H2O, (PBA)4BiI7·H2O, and (PBA)4InBr7·H2O [(PBA)+ = C6H5(CH2)4NH3+], with band gaps of ∼3.52, ∼2.29, and ∼4.05 eV, respectively. They possess zero-dimensional structures containing the inorganic octahedra [MX6]3– (M = Bi, In, X = Br, I) and unbound X– ions and crystallize in the C2 space group. (PBA)4BiI7·H2O shows a second-harmonic-generation (SHG) response in the infrared region, approximately 1.3 times that of AgGaS2; (PBA)4BiBr7·H2O and (PBA)4InBr7·H2O show SHG responses in the ultraviolet region, approximately 0.4 and 0.6 times that of KH2PO4, respectively. The large SHG responses are attributed to the synergistic contribution of the octahedral distortion of [MX6]3– (M = Bi, In, X = Br, I) and the ordered arrangement of the benzene ring-containing organic cation PBA+. Upon ultraviolet and visible-light excitations at room temperature, (PBA)4BiBr7·H2O, (PBA)4BiI7·H2O, and (PBA)4InBr7·H2O exhibit broad red-light luminescence with large Stokes shifts of 290, 237, and 360 nm, respectively, due to self-trapped exciton emission. All of these properties demonstrate that this series of metal halides are potential multifunctional optoelectronic materials.
研究领域:
材料科学
·
光学
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 8
·2203031
·
IF 9
Zhongyuan Li,Bin Li,Wuqi Liu,Dong Yan,Qiang Tang,Zhen Fang,Rong-Jun Xie
Mn 2+ -activated halide double perovskites (HDPs) are found to show promising luminescent behavior and have great potential for optoelectronic applications. However, such interesting materials hitherto are only limited to compounds with a monotonous three-dimensional structure and show a low photoluminescence quantum yield (PLQY). Herein, an Mn 2+ -doped two-dimensional (2D) layered HDP PPA 4 NaInCl 8 (PPA + = C 6 H 5 (CH 2 ) 3 NH 3 + ) showing promising photoluminescence properties is reported. The large separation between the adjacent inorganic sheets and the good dissolution of Mn 2+ in the layered structure endow PPA 4 NaInCl 8 :Mn 2+ with efficient red emission and a record PLQY of 69.90%. The spectroscopic analyses and density functional theory calculations indicate that the inherent absorption and luminescence stem from the inserted organic cations PPA + in PPA 4 NaInCl 8 . An energy transfer process occurs between the singlet excitons from PPA + and Mn 2+ , resulting in tunable emission accompanied by the variation of Mn 2+ concentration. These results provide several new fundamental insights on doping and doped 2D layered HDPs, which enhances the understanding of structure−property relations in this important family.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）