INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Wenli Song,Bing Zhang,Wenli Zhou,Jilin Zhang,Liping Yu,Shixun Lian
All-inorganic perovskite quantum dots (PQDs, CsPbX3, X = Cl, Br, and I) show outstanding application prospects in the field of photoelectric devices. In recent years, the development of PQDs has greatly improved their stability to water, oxygen, and light. However, thermal quenching of PQDs greatly limits their practical application. Herein, we embed PQDs into ATiO3 (A = Ca, Ba, and Sr) of three different mesoporous spherical structures to explore the effect on thermal quenching of PQDs. Because of the unique mesoporous hollow microsphere structure and low thermal conductivity of SrTiO3, it can effectively block the heat transfer and improve the thermal quenching of PQDs. The photoluminescence (PL) intensity of CsPbBr3@SrTiO3 composites is 72.6% of the initial intensity after heating to 120 °C. Moreover, the PL intensity of CsPbBr3@SrTiO3 composites remains about 80% of the initial value even when stored in air for 20 days or irradiated by 365 nm UV light for 48 h. A neutral white light-emitting diode is assembled by a blue chip, CsPbBr3@SrTiO3 composites, and red phosphor of K2SiF6:Mn4+, which has a color temperature of 5389 K and a color gamut covered 133% of National Television Standards Committee (NTSC).
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高影响因子
International Journal of Chemical Reactor Engineering
·
2022
·Vol. 21
·期 5
·663-678
·
IF 1.636
Feng Guo,Hua-jie Liu,Xin-zhi Zhou,Xiang-li Long
In this paper, a heterogeneous catalytic system consisting of Co/Mn/Br/activated carbon is used to catalyze 2-nitro-4-methylsulfonyl benzoic acid (NMSBA) production from the oxidation of 2-nitro-4-methylsulfonyltoluene (NMST) by oxygen. The activated carbon (AC) is made from coconut shell with acetic acid as an activator. The experiments indicate that the best AC is made by immersing coconut shell in 12 mol L −1 HAc solution at 50 °C for 32 h with a liquid/solid ratio (mL/g) of 5:1 and then being heated in nitrogen at 800 °C for 6 h. Compared with the Co/Mn/Br/H 3 PMo 12 O 40 @CAC (CAC, commercial activated carbon originated from coconut shell) catalytic system, the Co/Mn/Br/AC catalytic system is able to gain much higher NMSBA selectivity. In spite of holding smaller surface and less acidic groups, the AC owns much more carboxyl than CAC, which is the main reason for its better performance in the preparation of NMSBA.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
ChuanYu Lan,Yuandong Wu,Dajiang Mei,Shaoguo Wen,Thomas Doert
Three new complexes, namely (5,7-Dichloro-8-hydroxyquinoline)PbX (X=Br, I) ( 1, 2 ) and Pb2(5,7-Dichloro-8-hydroxyquinoline)4 ( 3 ), were synthesized through solvent evaporation at ambient temperature. The crystal structures and fluorescence emission properties of these complexes were systematically investigated. An analysis using single crystal X-ray diffraction revealed that complexes 1 - 3 form pseudo-dimeric structures through the interaction between lead and neighboring oxygen via secondary contacts. A comparison between the structures of complex 2 and [Pb(μ-Q)I] 2 , a complex of PbI 2 with 8-hydroxyquinoline, showed that the coordination polyhedron changed from a triangular pyramid to a distorted tetrahedron. This change may be attributed to the site resistance effect of the chlorine substituents coordinated to the quinoline ring. Complex 3 has a layered structure formed through secondary contacts and intramolecular hydrogen bonding C-H⋯O and C-H⋯Cl among the lamellar molecules. The maximum emission peak at 489 nm, 505 nm, and 543 nm for complex 1-3 can be assigned to the ligand-to-metal charge transfer (LMCT). The maximum emission peaks were red-shifted by 22 nm, 38 nm, and 75 nm, respectively, compared to the ligand. The number of ligands increases the conformational rigidity of the structure and the electron density on lead atoms causing the molecular structure to change, the energy alters, and the fluorescence peaks to move in the long-wave direction.
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Mingzhe Zhang,Wenhui Li,Wenning Zhao,Xiuxun Han
The carbon-electrode-based CsPbI2Br perovskite solar cells (C-PSCs) are promising photovoltaic technology because of their enhanced stability and low cost. However, the CsPbI2Br film suffers from uneven surface morphology with stripes and the defect-rich surface, which are detrimental to the charge carrier transport between perovskite and carbon. Here, we demonstrate that the formation of stripes is directly related to the I/Br homogenization process during annealing. By introducing a pre-annealing treatment before high temperature annealing, the I/Br homogenization process is modulated and the stripe is successfully wiped off. Besides, enhanced charge carrier transport in the C-PSCs is achieved. Oleic acid (OA) is then introduced to modify the stripe-free perovskite film surface. It is revealed that the carboxyl group in the OA molecule can passivate the undercoordinated Pb ions, leading to further improved charge carrier transport. Eventually, a power conversion efficiency (PCE) of 15.57% is achieved, which is among the highest PCE for the CsPbX3-based C-PSCs. This work demonstrates that combining surface planarization with surface passivation is an effective strategy for developing highly efficient C-PSCs.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Dingliang Dai,Jianhao Qiu,Guanglu Xia,Yong Tang,Zhonghao Wu,Jianfeng Yao
Core-shell Bi-MOF@BiOX (X = I, Br and Cl) hybrids were fabricated by a one-pot solvothermal strategy via regulating the concentration and type of halogen ions in the Bi-based CAU-17 synthesis. By virtue of the competitive coordination effect to Bi 3+ between CAU-17 and BiOX, CAU-17 was converted into another Bi-MOF with similar structures and compositions. Moreover, Bi 3+ plays the role of “bridge” and endows an intimate interface contact between BiOX and the Bi-MOF, which immensely expedites the charge and mass transportation. The obtained Bi-MOF@BiOX hierarchical heterostructures were applied to photocatalytic elimination of solo and mixed pollutants (Cr(VI)/tetracycline and Cr(VI)/o-nitrophenol), and exhibited favorable performances. Choosing Bi-MOF@BiOI as a typical example, the corresponding performances for Cr(VI) reduction, tetracycline and o-nitrophenol degradation in their solo systems are 14, 10, 8 times higher than those of CAU-17, and 13, 7, 5 times higher than those of BiOI under visible light, respectively. Of note, the above photocatalytic performances could be further improved in the coexisting environment of Cr(VI) and tetracycline or o-nitrophenol, which is attributed to the elevated charge separation efficiency caused by the timely consumption of photo-excited electrons and holes. This work gives some insights into the delicate design of MOF photocatalysts and their applications in environmental restoration.
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Advanced Optical Materials
·
2018
·Vol. 7
·期 4
·1801323
·
IF 7.43
Jiarui Hao,Xingyu Qu,Lei Qiu,Guogang Li,Yi Wei,Gongcheng Xing,Hongquan Wang,Chunjie Yan,Ho Seong Jang,Ziyong Cheng,Jun Lin
Currently, poor luminescence stability seriously impedes the practical application of inorganic halide perovskite (CsPbX 3 , X = Cl, Br, and I) quantum dots (QDs) in optoelectronic devices. In present work, CsPbX 3 QDs are successfully assembled on natural mineral halloysite nanotubes (HNTs) for improving the luminescence performances. Monodispersed CsPbX 3 QDs are arranged on two edges of HNTs in a highly ordered manner, which possibly originates from the electrostatic interaction between halogen ion and surface hydroxyl (Sur OH 2 + ) on the section face of HNTs. As expected, the photoluminescence (PL) performances of CsPbX 3 @HNTs nanocomposites are obviously improved. The PL intensity still can be maintained even 80% when working at 100 °C. Almost no emission degradation is observed after storing in an open ambient condition for 28 days. Moreover, the PL intensity also maintains 82% of room temperature (RT) intensity after continuously being illuminated by 365 nm UV lamps for 144 h. Excellent white light with Commission Internationale de l'Eclairage (CIE) chromaticity coordinates (0.34, 0.32) of the white light-emitting diodes (w-LEDs) fabricated by CsPbBr 3 @HNTs, CsPbBr 1.2 Cl 1.8 @HNTs, and CsPbBr 1.2 I 1.8 @HNTs phosphors are achieved. This work opens up a new insight in achieving stable CsPbX 3 QD-based multifunctional materials by designing nanocomposites with natural clay mineral.
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CHEMISTRY OF MATERIALS
·
2018
·
IF 9.89
Fei Li,Ying Liu,Hongliang Wang,Qian Zhan,Quanlin Liu,Zhiguo Xia
The control of surface properties of all inorganic cesium lead halide perovskite (CsPbX3; X = Cl, Br, or I) quantum dots (QDs) is essential to achieve excellent stability and high photoluminescence quantum yields (PLQYs). Herein, a facile method was performed to simultaneously enhance the stability and PLQYs of CsPbX3 QDs by a ZnX2/hexane solution post-treatment. We show that the halogen defect on the surface of CsPbX3 QDs can be treated in a controlled way, whereby the “black dots” that adhered on the surface as observed by transmission electron microscopy have be completely removed, resulting in enhanced stability and photoluminescence. The PLQYs of CsPbCl3, CsPbBr3, and CsPbI3 increased from 4, 58, and 63% to 86, 93, and 95%, respectively, and the origin of the “black dots” as well as their transformation mechanism has been demonstrated. As a result, the poly(dimethylsiloxane) composite films created by encapsulating stable and nearly defect-free green-emitting CsPbBr3, the red-emitting K2SiF6:Mn4+ phosphor, and a blue emission GaN chip were prepared and used to fabricate a remote-type white light-emitting diode device, which exhibits a high luminescence efficiency (≤98 lm/W) and a wide color gamut (∼130% of the National Television Standard Committee standard), suggesting the potential for liquid crystal display backlight application.
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RSC Advances
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2016
·Vol. 6
·期 59
·54020-54026
·
IF 3.289
Jikuan Qiu,Yuling Zhao,Huiyong Wang,Guokai Cui,Jianji Wang
Development of new efficient catalytic systems for chemical transformation of CO2 is a very attractive topic in green chemistry. In this work, we studied the synthesis of α-alkylidene cyclic carbonates through the coupling reaction between propargylic alcohols and CO2 with new silver catalysts. It was found that activated carbon supported AgX (X = Br and I) was a simple and efficient catalyst for the carboxylative cyclization of propargyl alcohols with CO2 at atmospheric pressure and room temperature. Nearly 99% yield of the desired product was obtained, and the product could be simply separated through solvent extraction. Moreover, the catalyst could be easily recovered and reused at least ten times without a decrease in the catalytic activity and selectivity. These findings are useful for the development of an environmentally friendly chemical process for the production of α-alkylidene cyclic carbonates.
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International Journal of Pharmaceutics-X
·
2024
·
IF 5.2
Xing Liu,Wenwen Shen
In this study, the trastuzumab-functionalized SK-BR-3 cell membrane-wrapped mesoporous silica nanoparticles loaded with pyrotinib (Tra-CM-MSN-PYR) were prepared for targeted therapy of HER2-positive breast cancer. Transmission electron microscopy (TEM) characterization showed that MSN had a spherical morphology with mesoporous channels and that the structure of Tra-CM-MSN was a cell membrane (CM) layer successfully coated on the surface of MSN. A cellular uptake assay demonstrated that FITC-labeled Tra-CM-MSN were taken up by SK-BR-3 breast cancer cells, which illustrated that Tra-CM-MSN had good targeting ability compared with CM-MSN and MSN. In vivo imaging experiments demonstrated significant accumulation of FITC-labeled Tra-CM-MSN in tumor tissues, further proving that Tra-CM-MSN have superior targeting properties. Cell apoptosis experiments suggested that Tra-CM-MSN-PYR significantly inhibited the proliferation of SK-BR-3 breast cancer cells. The results of in vivo animal experiments also showed that Tra-CM-MSN-PYR significantly inhibited tumor growth. These results indicate that Tra-CM-MSN-PYR has potential application as a targeted therapy for HER2-positive breast cancer in the future.
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Nanoscale
·
2024
·Vol. 17
·期 1
·567-574
·
IF 5.8
Jia-Lei Xu,Rui-Dong Shi,Hai-ping Zhou,Guo-Tao Xiang,Zi-Dong Zhou,Yong-Da Hu,Jin-Ju Chen
Silver nanowires (AgNWs) with high aspect ratios are pivotal for the production of flexible transparent conductive films (TCFs). The growth of AgNWs is significantly influenced by the strong affinity of halogen ions for silver ions. This affinity plays a crucial role in the controlled deposition of silver along the nanowire axis. By precisely controlling the concentrations of Cl− and Br− ions, we have successfully synthesized AgNWs with remarkable lengths of 96 μm and diameters of 40 nm, achieving an impressive aspect ratio of 2400. Utilizing density functional theory and molecular dynamics simulations, we investigate the impact of these ions on the growth of AgNWs. Our findings reveal that halogen ions strongly adsorb onto the Ag (100) plane in the radial direction, with Cl− ions promoting anisotropic growth and Br− ions effectively limiting the nanowire diameter, thus achieving high aspect ratio AgNWs. The resulting TCFs exhibit a high transmittance of 95.0% at 550 nm and a low sheet resistance of 14.7 Ω sq−1. Moreover, when integrated into a flexible transparent heater, these TCFs demonstrate a high heating rate of 12.1 °C s−1. The development of AgNWs is poised to significantly enhance the performance and versatility of flexible TCFs.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Mingquan Liu,Yingying Jiao,Junchao Qin,Zhongjun Li,Jianshe Wang
Nonmetals doping are effective for adjusting the electronic and molecular structures of C 3 N 4 nanosheets (CN), which could broaden the range of visible light response and improve the photo-induced electron-hole separation. Here a series of nonmetals (S, P, F and Br) doped C 3 N 4 nanosheets (x-CN) decorated with boron doped C 3 N 4 nanodots (BCNDs) was prepared for the first time. Compared with the pristine nonmetals doped CN, the integrating of BCNDs with x-CN can effectively facilitates the charge separation and transfer in the photocatalytic process, and endows enhanced photocatalytic activity for hydrogen production. The maximum photocatalytic hydrogen production rate of the BCNDs/S-CN, BCNDs/P-CN, BCNDs/F-CN and BCNDs/Br-CN composite can reach 3924.81 μmol·g −1 ·h −1 , 2387.62 μmol·g −1 ·h −1 , 2374.06 μmol·g −1 ·h −1 and 3471.56 μmol·g −1 ·h −1 respectively, which is about 3.3, 4.3, 4.0 and 3.1 times that of their counterparts, respectively. This work demonstrates that BCNDs plays an important role to improve the photocatalytic properties by forming 0D/2D isotype heterojunction with nonmetals doped C 3 N 4 nanosheets and provides new members for heterojunction photocatalysts, which is conductive to further fundamental and applied research.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2020
·Vol. 27
·期 3
·1-11
·
IF 2.426
Du Chunhui,Zhang Xinyi,Ma Xumin
In order to obtain the tunable and charged surface of the membranes, polymerized ionic liquid(PIL) block copolymers poly (methyl methacrylate) (PMMA)-b-poly(1-[(2-methacryloyloxy)ethyl]-3-butylimidazoliumbromide) (PMEBIm-Br) with different poly(ionic liquid) brush lengths were synthesized by RAFT polymerization method and used in the fabrication of poly(vinylidene fluoride) blend membranes. Chemistry analysis confirmed the successful copolymerization of P(MMA-b-MEBIm-Br) with different chain lengths of PMEBIm-Br blocks, and the PIL groups was also detected on the surface of the blend membranes, which contributes to the hydrophilic and positively charged surface of the membrane. These properties were further enhanced by the chain length of PMEBIm-Br blocks in the copolymer. The surface wettability of the membranes can be regulated from hydrophilicity to hydrophobicity by anion exchange, and the water flux changes also confirmed these phenomena. In addition, the effects of PMEBIm-Br blocks on the separation properties of the membranes were investigated using two dyes, namely, orange G and rhodamine 6G. Results indicated that the blend membranes with long length of PMEBIm-Br blocks had high rejection and good antifouling property to rhodamine 6G. Furthermore, the adsorption experiment of the blend membranes to the two dyes also indicated that blend membranes with long length of PMEBIm-Br blocks would have good dye adsorption-separation property.
研究领域:
材料科学
·
化学工程
·
环境科学
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