INORGANIC CHEMISTRY
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2022
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IF 5.436
Wei Shen,Liu Yang,Jingting Feng,Yanfeng Chen,Wei Wang,Jianbin Zhang,Lihui Liu,Kun Cao,Shufen Chen
Generally, solvents used to synthesize perovskite NCs are toxic, which leads to waste liquid pollution and environmental degradation. Herein, we developed a novel environmentally friendly polar solvent method to synthesize CsPbBr3 nanocrystals (NCs). Over 65% photoluminescence quantum yield (PLQYs) for NCs could be maintained over 45–850 h of storage time, and a maximum was 78% at 750 h. Such amazing stability in polar solvents is dominated by a ripening process, which heals surface defects. Additionally, their solid films also exhibited good moisture stability. Furthermore, CsPbBr3 NCs were applied to inkjet-printing to prepare high-quality patterned films.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Lan Ding,Fenghua Bai,Burenbayaer Borjigin,Yuning Li,Huiqin Li,Xiaojing Wang
Solar-energy-driven CO 2 conversion into valuable chemical fuels holds great renewable potential. However, most photocatalysts' weak CO 2 adsorption limits more artificial photosynthesis for further utilization. Herein, we present an in situ assembling approach to produce stable Cs 2 AgBiBr 6 /Ce-UiO-66-H composite, in which a tight contact interface between the two participated components was constructed. Benefiting from the photocatalytic properties and high adsorption capacity for CO 2 , the optimized 20Cs 2 AgBiBr 6 /Ce-UiO-66-H adsorption-photocatalyst exhibits outstanding performance for reductive CO 2 deoxygenation with considerable CO generation rate (309.01 μmol g −1 h −1 ) under simulated solar light irradiation with 300 W Xe lamp, which is about 2.1 and 2.7 times than that of pure Cs 2 AgBiBr 6 and Ce-UiO-66-H, respectively. The excellent catalytic conversion of CO 2 is ascribed to the effective solar harvest and quickly photo-excited carriers’ separation in such assembled architecture. Importantly, due to the in-situ synthesis, Cs 2 AgBiBr 6 QDs are intercalated in the Ce-UiO-66-H frameworks and it could lead to improved stability and induce abundant oxygen vacancies in Cs 2 AgBiBr 6 /Ce-UiO-66-H, which can maintain unchangeable CO 2 conversion rate under wet air with consecutive ten hours of the recycling test. In this work, the combining metal–organic frameworks and lead-free halide perovskite provide great potential for artificial photocatalytic CO 2 -to-CO conversion under a mild gas–solid reaction condition via utilizing solar energy.
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CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
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2022
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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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Materials Today Physics
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2022
·
IF 11.021
Tao Huang,Qilin Wei,Wenchao Lin,Hui Peng,Shangfei Yao,Bingsuo Zou
In this paper, a new zero-dimensional organic-inorganic hybrid manganese bromide single crystal with high-efficiency yellow-green emission has been synthesized by inserting C 6 H 16 N 2 2+ into [MnBr 4 ] 2- tetrahedrons lattice, and its PLQY reaches up to 89%. At the same time, the relationship between the emission wavelength and relaxation process under CW laser excitation was investigated in this single crystal, exhibiting different emission colors under continuous-wave laser excitation of different wavelengths. The results show that the distance between the nearest Mn 2+ in the lattice is 6.8 Å, this number brings up a very weak ferromagnetic coupling state and a dominant paramagnetic state, which lead to a significant emission band at 550 nm and a weak emission band at about 640 nm when excited by 325 nm laser. The high-level d-d transition at about 400 nm and AFM d-d transition at 458 nm band could be found simultaneously under continuous-wave laser excitation above the bandgap, and the photophysical properties of the multiple emission bands and the microscopic interactions of the spin, carrier, and phonon inside the lattice have been discussed. These findings provide a new direction for Mn-based materials in the field of luminescence and provide ideas for the development of new materials with the microscopic interaction modulation of the spin, carrier, and phonon.
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CRYSTAL GROWTH & DESIGN
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2022
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IF 4.01
Chenxi Liu,Minghui Chen,Hongrui Li,Quan Shi,Yaqing Feng,Bao Zhang
Unique features, including a high specific surface area, great stability, and crystallinity, make covalent organic frameworks (COFs) intriguing sorbents and catalysts in light-driven water pollutant degradation. Inspired by the light absorption capability of porphyrin derivatives and the carrier separation ability of a donor–acceptor (D–A) configuration, we constructed two-dimensional porphyrin donor-based D–A COFs: COF-HTBD involving only tetrahydroporphyrins and COF-HMTBD (M = Co, Fe, Cu) involving both tetrahydro- and metalloporphyrins via a mixed porphyrin monomer strategy. The monomer 2,1,3-benzothiadiazole-4,7-dicarboxaldehyde (BD) is incorporated as an electron accepting moiety. Interestingly, COF-HTBD, COF-HCuTBD, and COF- HFeTBD exhibit staggered stacking, while the stacking model of COF-HCoTBD transforms from staggered to eclipsed. Notably, COF-HFeTBD demonstrates excellent activities and stabilities toward visible light-driven photocatalytic rhodamine B (RhB) degradation in aqueous solutions with H2O2 present (100% removal in 3 h). Overall, this work provides an interesting strategy for the construction of D–A-type porphyrin COFs for dye pollutant removal.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Xia Zhou,Xiaoling Lin,Haiqiu Huang,Ping Li,Jiamin Wu,Xueqin Huang,Huaihong Cai,Hai Han,Junxia Zheng,Haibo Zhou
Visual, highly selective, and sensitive detection of sulfur dioxide (SO 2 ) and its derivatives (SO 3 2- ) in vitro/in vivo is of great significance in maintaining cell homeostasis. A new Au@Ag@ZIF-8 optical sensor with o-phenylenediamine (OPD) internal coding surface-enhanced Raman scattering (SERS) tags based on the free radical reaction was synthesized for multi-mode detection of sulfite . First, Co 2+ is oxidized to Co 3+ . Second, the oxidoreduction between SO 3 2- and Co 3+ produces SO 4 -• and Co 2+ to complete the cycle. The resulting SO 4 -• is further reacted with the chromogenic substrate OPD to form the polymer. Due to the UV–vis absorbance of OPD polymer being stronger than that of OPD, but the fluorescence intensity is lower, and their Raman peaks are obviously different, this sensor can be used for the detection of SO 3 2- through colorimetric, fluorescence, and Raman multi-mode. The main advantages are as follows: (1) high selectivity; (2) achieve fast, visual, and highly sensitive detection of SO 3 2- , and the low limit of detection (LOD) is 1 nM; (3) improve the reliability of detection and expands the detection range (1 nM-800 μM); (4) demonstrate the applicability in recognizing SO 3 2- in HeLa cells to provide accurate information on the dynamic distribution of sulfur in cells.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Chongguang Lyu,Chang Liu,Huihua Min,Xinyu Shi,Ran Jiang,Zhikang Ao,Xu Zhang,Chunli Wang,Huifang Ma,Lin Wang
Lead-free double perovskites have been an excellent candidate for resistive memories due to their mixed electronic-ionic properties, remarkable ambient stability and nontoxicity. However, the studies on resistive memories of rare-earth ion doping lead-free double perovskite are scarce to date. Here, we report the lead-free double perovskite Cs 2 AgBiBr 6 films with tuning rare earth Nd 3+ content by the vacuum sublimation and solution processing. The X-ray diffraction (XRD) pattern and scanning electron microscopy (SEM) confirm that Nd-doped Cs 2 AgBiBr 6 films show high crystallinity and phase purity. We also systematically investigate the resistive memory properties of the resulted Cs 2 AgBiBr 6 films doped by different content Nd 3+ . The resistive memory devices demonstrate a typical write-once-read-many-times (WORM) behavior with low on-set voltage and long retention time. Particularly, the ON/OFF ratio of Nd-doped Cs 2 AgBiBr 6 film is 1000 times higher than that of the undoped Cs 2 AgBiBr 6 film. This study exhibits that Nd-doped Cs 2 AgBiBr 6 film provide a new material platform for lead-free perovskite-based application in future electronics and optoelectronics .
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Zihao Cui,Peng Wang,Yaqiang Wu,Xiaolei Liu,Guoqiang Chen,Peng Gao,Qianqian Zhang,Zeyan Wang,Zhaoke Zheng,Hefeng Cheng,Yuanyuan Liu,Ying Dai,Baibiao Huang
A facile and effective impregnation method is employed to synthesize the space-confined growth of lead-free halide perovskite Cs 3 Bi 2 Br 9 in MCM-41 molecular sieve. This MCM-41 @CBB (Cs 3 Bi 2 Br 9 ) composite shows an outstanding performance for the photocatalytic reduction of CO 2 to CO at the gas−solid condition under visible-light irradiation. The CO production rate of the MCM-41 @ 50 wt% CBB is determined to be 17.24 μmol g −1 h −1 , which greatly exceeds that of pure CBB (1.89 μmol g −1 h −1 ). The composite is highly stable showing no apparent decrease in the catalytic activity after 8 cycles of repeated experiment. The performance of space-confined growth of CBB nanoparticles in the serial molecular sieve exhibits 2.97–13.4 fold higher than that of pure CBB, respectively, which is superb than CPB (CsPbBr 3 ) and MCM-41 @CPB prepared in the same condition. The results are comparable with those reported for many lead halide perovskites, and are in the top among the lead-free perovskites, especially bismuth halide perovskites.
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OPTICAL MATERIALS
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2022
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IF 3.754
Yun Tang,Ben Liu,Nan Yan,Xiaoqiang He,Hudie Yuan,Yalou Xin,Hongfeng Yin
Widespread application of YAG:Ce-based white light-emitting diodes (WLEDs) is being challenged due to the lack of red emission, leading to their poor color rendering index (Ra) and high correlated color temperature (CCT). Perovskite quantum dots (QDs), presenting high photoluminescence quantum yield and simple fabrication process have been recognized as promising red-emitting component for warm WLEDs. However, conventional method by mechanically mixing QDs with YAG:Ce always results in undesirable dispersion due to their huge size difference. Moreover, the two components display different sinking behavior in silicone , which would further deteriorate the color uniformity of WLED. To address these issues, in this study, red-emitting MAPbBr 3-x I x QDs-coated YAG:Ce (A-YAG@QDs) composites were successfully prepared to further fabricate WLED with compensated red emission. The chemical coordination interactions between QDs and functionalized YAG:Ce make the two components behave as a whole, which effectively avoids the dispersion and sinking-related issues. The WLED, which combined blue LED chip and A-YAG@QDs composite, exhibited warm white light with low CCT of 4474 K, high Ra of 90.1 and high value of saturated red color component R9 as 95. This study demonstrated a promising strategy to prepare QDs-coated phosphor composites for the generation of warm white light for indoor lighting application.
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DALTON TRANSACTIONS
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2022
·Vol. 51
·期 20
·8036-8045
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IF 4.569
Shengqi Xu,Lu Yang,Yixuan Wei,Yiming Jia,Meiqi Hu,Lianxia Bai,Junzheng Zhang,Xinxin Li,Shuo Wei,Jun Lu
Converting CO2 into valuable solar fuels through photocatalysis has been considered a green and sustainable technology that is promising for alleviating global warming and providing energy in an environmentally friendly manner. However, traditional photocatalysts generally suffer from low surface-reactive reaction sites, inefficient light harvesting and rapid recombination of electron–hole pairs. Lead halide perovskite materials have been considered ideal semiconductor photocatalysts for photocatalytic CO2 reduction due to their tunable band gaps, strong light absorption, and low cost. Herein, a series of L2Csn−1PbnX3n+1 (L = ba, ha, oa; X = Cl, Br, I; n = 1, 2) 2D layered perovskites were synthesized by a facile solvothermal method. The effects of alkyl amine chain length, halogen atoms and inorganic layer number on their properties were studied. More importantly, these 2D materials were used as photocatalysts for CO2 reduction without any sacrificial agents. These 2D perovskites exhibited markedly increased performance in comparison with 3D bulk materials, benefitting from the larger surface-area-to-volume ratio and faster and more efficient exciton dissociation, which achieved the highest CO yield of 158.69 μmol g−1 h−1 and CH4 yield of 6.9 μmol g−1 h−1 through the design of the photocatalytic system. In addition, the influence of light source conditions on photocatalysis was studied systematically, including light source intensity and wavelength. The experimental results indicated that an appropriate solvent, high light intensity and monochromatic light source matching the wavelength of exciton absorption can effectively improve the photocatalytic efficiency.
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Journal of the American Chemical Society
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2022
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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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CERAMICS INTERNATIONAL
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2022
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IF 5.532
Chongguang Lyu,Yuchi Qian,Guixiang Zhan,Jiaxiao Yuan,Kaiyue He,Huihua Min,Chang Liu,Yang Cao,Xuefen Song,Huifang Ma,Yunfei Liu,Lin Wang
Rare earth ions have been widely investigated as active dopants in various materials because of their distinct optical, electronic and magnetic properties . Halide perovskite resistive memories have attracted increasingly recent interest for tremendous potential applications in computation and data storage techniques. However, it remains unexplored to implement rare earth doping strategy for tuning perovskite resistive memories. Here, we report read-only memories based on environment-friendly and air-stable lead-free double perovskite Cs 2 AgBiBr 6 films, which is particularly tuned by rare earth La 3+ doping. We use the vacuum sublimation and solution processing method to obtain Cs 2 AgBiBr 6 crystals doped by different content La 3+ , and fabricate resistive memory devices based on doped Cs 2 AgBiBr 6 films. The simplest sandwich-like structure composed of ITO/La-doped-Cs 2 AgBiBr 6 /Ag only is designed in cross-bar array architecture with high-integration and simple operation. The resistive memory device of La-doped Cs 2 AgBiBr 6 films demonstrate a typical write-once-read-many-times (WORM) behavior with low onset voltage of 1 V and long retention time of 12000 s. In particular, the ON/OFF ratio of the La-doped Cs 2 AgBiBr 6 film is 100 times higher than that of the undoped Cs 2 AgBiBr 6 film. This study provides a new insight to design and manipulate memory devices based on lead-free halide perovskite materials through doping effect of rare earth ions.
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