Advanced Optical Materials
·
2023
·Vol. 12
·期 11
·2302434
·
IF 9
Zhi-Zhong Zhang,Zi-Lin He,Jian-Bin Luo,Jun-Hua Wei,Xiu-Xian Guo,Jing-Hua Chen,Dai-Bin Kuang
The current mainstream planar X-ray imaging techniques face significant challenges for accurately capturing the internal structure of curved objects, since the variable distances between the curved objects and the flat-panel scintillation screen cannot eliminate the distortion in X-ray imaging. Though large-area and transparent curved scintillation screens are much more desirable. Here, organic–inorganic hybrid Mn-based single crystals ([CH 3 Ph 3 P] 2 MnX 4 , X = Cl, Br, I) exhibiting high photoluminescence quantum yield (PLQY) and low melting temperature have been employed to prepare transparent glass for X-ray scintillation imaging application through a low-temperature melting strategy. The [CH 3 Ph 3 P] 2 MnBr 4 -glass shows high PLQY (47.8%), high-resolution X-ray imaging performance (12.3 lp mm −1 ), low limit of detection (25.33 nGy s −1 ), and impressive X-ray irradiation stability (102 Gy). Furthermore, high-contrast X-ray imaging at a low dose (6.865 µGy per exposure, 14.5 times lower than the chest radiograph) is achieved. Based on the low glass transition temperature ( T g = 53.6 °C) and easy-shapeable properties of [CH 3 Ph 3 P] 2 MnBr 4 -glass scintillator, the large-area curved scintillation screen with a series of sizes of Φ 2×4 – Φ 8×4 cm 2 can be easily fabricated and show high X-ray imaging quality. These findings provide a paradigm for future research in shapeable X-ray scintillators, unlocking new possibilities for curved and 3D X-ray imaging.
研究领域:
材料科学
·
光学
·
放射学
·
成像技术
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DOI
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AIP Advances
·
2022
·Vol. 12
·期 3
·
IF 1.697
Wu Yao,Kong Lingce,Zhang Xiuling,Guo Yueting,Sun Yaxin,Zhao Chonglin,Chen Wenming,Zuo Yanjun,Li Congju
Protection against harmful chemical compounds is a major social concern, especially chemical warfare agents (CWAs) that are easy to synthesize and can cause mass casualties. The metal oxides with large surface area, porous structures, and a large number of active sites have shown outstanding performance for the adsorption and decontamination of CWAs. However, single-component metal oxides show a lower degradation rate for chemical warfare agents. Here, we demonstrate a convenient homogeneous hydrolysis method for the synthesis of mesoporous manganese-based multi-component metal oxides. Our strategy enables Ce or/and Zr to be doped into the δ-MnO 2 structure during the forming process, remarkably enlarging the surface area and providing rich active sites for CWA catalysis. The as-synthesized multi-component metal oxides exhibit excellent performance for the CWA degradation. It is surprising to find that the best degree of removal of mustard gas (HD), soman (GD), and the VX nerve agent (VX) is 90.60%, 87.32%, and 100%, respectively, reaction with multi-component samples in 4 h, 2.92-fold increase to HD, 8.28-fold increase to GD, and 1.67-fold increase to VX contrast with undoped δ-MnO 2 . This work may provide an avenue for developing new generation chemical warfare agent decontamination materials and other catalysts.
研究领域:
材料科学
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化学工程
·
环境科学
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高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 7
·2002175
·
IF 6.147
Lu Hou,Yihua Zhu,Jingrun Zhu,Xuyan Li,Feng Zeng,Tingyu Yang,Yiqin Gong,Jianhua Shen,Chunzhong Li
Mn-doped 2D perovskites are emerging as good candidates for light-emitting applications due to their excellent optical and electrical properties. Major synthetic routes, solid-state grinding and high-temperature solution synthesis, are extensively studied to prepare Mn-doped 2D perovskites. However, complicated synthesis, small-scale yields, and poor-stability impede their widespread applications. Herein, a one-step acid-solution-assisted method is exhibited for gram-scale production of Mn-doped 2D (C 8 H 17 NH 2 ) 2 PbBr 4 with a solid yield of 1.35 g products out of 3 mL solvent. After Mn-doped 2D (C 8 H 17 NH 2 ) 2 PbBr 4 being stored in the air for 90 days, the photoluminescence (PL) quantum yield of powders has minor changes, showing good stability. Phosphor-converted monochrome light-emitting diodes (LEDs) are fabricated. After the LEDs work 6 h under a voltage of 3 V, their PL spectra have no obvious change, showing a great potential in optoelectronic devices. This study provides a new effective strategy for large-scale synthesis of ultrastable Mn-doped 2D perovskites, which is expected to provide inspiration for the industrial optoelectronic applications of perovskites.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 11
·期 4
·1251-1257
·
IF 8.067
Zi-Lin He,Jun-Hua Wei,Jian-Bin Luo,Zhi-Zhong Zhang,Dai-Bin Kuang
The flexibility afforded by their modular structure confers fruitful unique properties to organic–inorganic hybrid metal halides (OIMHs). Typically, stimuli-responsive materials have wide applications in thermal imaging, thermometry, and anti-counterfeiting. Herein, the Mn(II)-based OIMHs (TMS)2MnBr4 (TMS = trimethylsulfonium) were prepared through a facile dry ball-milled method. The obtained ball-milled powders show an intriguing phase transition along with emission switching. Importantly, photoluminescence (PL) switching can be realized by simply laying hands on the (TMS)2MnBr4 powders, highlighting their promising application potential in portable thermosensitive devices.
研究领域:
材料科学
·
无机化学
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光电功能材料
·
智能响应材料
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高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 8
·2493-2499
·
IF 5
Junxing Wang,Fangwei Liu,Jianzhou Wu,Shihui Zou,Jie Fan
Engineering Mn–Na2WO4 catalysts for efficient oxidative coupling of methane (OCM) at low temperatures (T ≤ 700 °C) is appealing yet challenging. Herein, we report a LaCeZr ternary oxide supported Mn–Na2WO4 catalyst, which achieves 20.9% C2 yield at 700 °C with at least 50 hour stability. Characterizations suggest that LaCeZr ternary oxides can promote the redox properties of Mn–Na2WO4 catalysts, which facilitate O2 activation at low reaction temperatures and generate more active oxygen species to activate CH4 into C2 products.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Aysh Y. Madkhli
To generate red emissions, manganese (IV) ions have recently gained recognition as potent non-rare-earth activators. However, the oxide and fluoride hosts that offer suitable environments for Mn 4+ require careful preparation, involving precise control of reaction parameters like redox equilibrium and temperature. In the current work, we show simultaneous oxidation of Mn 2+ to Mn 4+ by devitrification of glassy Na 2 Ge 4 O 9 : Mn under moderate atmospheric conditions and under the argon atmosphere. The G-sample was devitrified via thermal treatment after the parent glass, which shares the same chemical formula as dilithium tetragermanate (Na 2 Ge 4 O 9 ), was created through the use of traditional melt-quenching (MQ). Optical spectroscopy and electron paramagnetic resonance (EPR) spectroscopic are utilized to confirm the Mn 2+ oxidation to Mn 4+ from glass stat to glass ceramic after thermal treatment. Due to the transition from Mn 2+ to Mn 4+ , a sharp 668 nm emission peak is recorded whereas the red emission peaking at 611 nm monitored in glass is steadily reduced. The temperature-dependent PL spectra of the Na 2 Ge 4 O 9 :0.1Mn +4 , red-emitting GC in the temperature range ∼295–490 K were recorded. The PL emission intensity decreases gradually with increasing the temperature. The technique showcased for producing Na 2 Ge 4 O 9 :Mn 4+ phosphors could be expanded to synthesize other phosphors incorporating activators possessing a high oxidation state.
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高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 30
·4355-4363
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IF 3.1
Ling Li,Yuwei Zhong,Yongfei Hu,Jilin Bai,Fen Qiao,Abdelaal S. A. Ahmed,Ghafar Ali,Xiujian Zhao,Yi Xie
All-inorganic lead halide perovskite (LHP) nanomaterials have been recognized as a competitive candidate for optoelectronic applications. However, the lead toxicity and intrinsic instability have limited their commercialization. Herein, a facile room-temperature approach is developed for the synthesis of an environmentally friendly all-inorganic orange-red-emitting Ag-doped and Mn-doped lead-free halide double perovskite Cs2NaBiCl6 (CNBC) in the shape of an octahedron. Only very weak orange-red photoluminescence (PL) is observed in the undoped CNBC octahedrons. However, both Ag and Mn doping heavily enhance the PL intensity of the CNBC samples. The stability of the representative Ag-doped and Mn-doped CNBC is studied under various conditions such as an ambient environment, high temperatures up to 400 °C, and UV irradiation. The alcohol-based photocatalytic performances of the samples are investigated by degradation of Rhodamine B (RhB), methyl orange (MO) and methylene blue (MB) in ethanol, demonstrating a strong and stable photodegradation activity. This work will offer a facile and cost-effective protocol in doped lead-free double perovskites as a stable and environmentally friendly alternative for environmental photocatalysts.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 19
·1-13
·
IF 2.8
Hu Lifang,Yang Kun,Liu Xijing,Zhu Jichao,He Jie,Chen Xiaoyang
Semiconductor photocatalysis is a green and environmentally friendly antibiotic wastewater treatment technology without secondary pollution. In this paper, a series of montmorillonite (MMT) samples loaded with Cu, Mn, and Ni were prepared by impregnation method. The structure and spectral response of the as-prepared samples were characterized by powder X-ray diffraction, energy-dispersive spectroscopy, laser Raman spectroscopy, X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS), electrochemical impedance spectroscopy, and photocurrent response test. The photocatalytic degradation of tetracycline hydrochloride (TCH) was carried out under simulated solar irradiation, and the photocatalytic properties of MMT samples with different loads were investigated. The characterization results show that Cu and Mn have strong interaction with MMT, and composite photocatalyst Cu 10 Mn 10 -MMT has the smallest Nyquist arc and higher photocurrent intensity. Degradation experiments on TCH showed that Cu 10 Mn 10 -MMT had the best photocatalytic degradation, with a degradation rate of 79.78%, three times that of the original MMT. Active substances capture experiments showed that h + and O 2 . − were the main active substances for the degradation of TCH by Cu 10 Mn 10 -MMT. After the combination of Cu, Mn, and MMT, the band structure changed, resulting in more h + and O 2 .− involved in the redox reaction, thereby improving the photocatalytic degradation performance of TCH. In this work, a promising photocatalyst is used to efficiently and greenly degrade antibiotic wastewater.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 24
·1-12
·
IF 2.8
Qu Jing-Jing,Liu Fei,Yuan Chang-Lai,Liu Xiao,Meng Liu-Fang,Shen Nai-Rui,Ning Hui-Wang,Jiang Wei
The Mn 3+ -ions doped Ba(Mn x Bi 1− x )O 3 ( x = 0.0, 0.02, 0.04, 0.06, 0.08 and 0.1) ceramic block samples are prepared by traditional solid-state method. The phase structures of these ceramic systems are analyzed, in which the XRD analysis results show the ceramic systems can be formed the solid solutions as the relatively lower Mn-adding content of x ≤ 0.4, and the ceramic blocks appear the additional diffraction peak belonging to the MnO 2 second phase with the increase of x value (≥ 0.6). Combined with the acceptor atom-doping conduction model theory and XPS analysis results, the main conductive forms of these Ba(Mn x Bi 1− x )O 3 thermistors include in the following three kinds: the movable holes formed by the acceptor Mn-doping, the 2Bi 4+ → Bi 3+ + Bi 5+ disproportionation reaction, and the [Mn 3+ /Mn 4+ ] small polaron jump. For the electrical properties test results, the NTC thermal properties for the x = 0.02 and x = 0.06 samples are relatively superior: ρ 25 − 690 Ω cm, B 25/85 − 3150 K and ρ 25 ~ 940 Ω cm, B 25/85 − 3080 K, respectively.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Tong Wei,Kai Lian,Jiaqi Tao,Hu Zhang,Da Xu,Jiachen Han,Chao Fan,Zihui Zhang,Wengang Bi,Chun Sun
Luminescent solar concentrators (LSCs) can be used as large-area sunlight collectors, which show great potential in the application of building-integrated photovoltaic areas. Achieving highly efficient LSCs requires the suppression of reabsorption losses while maintaining a high photoluminescence quantum yield (PLQY) and broad absorption. Perovskites as the superstar fluorophores have recently emerged as candidates for large-area LSCs. However, highly emissive perovskites with a large Stokes shift and broad absorption have not been obtained up to now. Here, we devised a facile synthetic route to obtain Mn-doped multiple quantum well (MQW) Br-based perovskites. The Br-based perovskite host ensures broad absorption. Efficient energy transfer from the exciton to the Mn dopant produces a large Stokes shift and high PLQY simultaneously. By further coating the perovskites with Al2O3, the stability and PLQY are greatly elevated. A large area of liquid LSC (40 cm × 40 cm × 0.5 cm) is fabricated, which possesses an internal quantum efficiency (ηint) of 47% and an optical conversion efficiency (ηopt) reaching 11 ± 1%, which shows the highest value for large-area LSCs.
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Lijun Niu,Lili An,Kaiting Zhang,Qian Chen,Xin Yu,Menglu Zhang,Mingbao Feng
The increased release of various emerging organic contaminants into natural waters has posed great threats to ecological safety and public health. The ensuing global water contamination has necessitated the development of highly efficient treatment strategies for water purification . Herein, we presented for the first time that the combined utilization of permanganate (Mn(VII)) and periodate (PI) could synergistically and rapidly accomplish complete destruction of different organic micropollutants (e.g., bisphenol F, methotrexate, and tetracycline) within 2–5 min. Comparatively, the single treatment only eliminated very small amounts of micropollutants. Mechanistic investigations were performed using the trapper-based electron spin resonance , scavenging and probe experiments, UV–vis spectra analysis, determination of iodine species, and multiple validation tests. These data collectively suggested that the highly reactive Mn(V)/Mn(VI) intermediates played the leading role in accelerating contaminant abatement within the Mn(VII)/PI oxidation system. Reactive oxygen/or iodine species ( 1 O 2 , OH, O 2 - , IO 3 , and IO 4 ) and low valence Mn species (Mn(II), Mn(III), and in-situ formed MnO 2 colloids) did not participate in decontamination in this process. Subsequently, the oxidized products of three micropollutants were determined, and the transformation pathways were clarified. Ring-opening, C-C bond cleavage, demethylation, carbonylation , and hydroxylation reactions mainly occurred in the degradation process. Notably, the combined system did not yield any toxic iodinated end products. Finally, the environmental risks of the degradation products were also evaluated based on in silico QSAR-based prediction tools. Overall, this study provides a novel, highly efficient, and green treatment technology, i.e., Mn(VII)/PI system, which could be employed for rapid and sustainable water decontamination.
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JOURNAL OF THE ENERGY INSTITUTE
·
2022
·
IF 6.47
Xinbo Zhu,Haiping Xiong,Jin Liu,Yuting Gan,Zitan Xu,Chunlin Zhou,Yaolin Wang,Ye Jiang,Xin Tu
In this work, Fe–Mn based ternary catalysts (Fe–Mn-X, X = Ce, Co and Cu) were evaluated in the plasma-catalytic oxidation of ethylene oxide (EO) using a cylindrical dielectric barrier discharge (DBD) reactor. The addition of transition metal dopants to the Fe–Mn catalyst significantly improved the performance of plasma-catalyzed EO oxidation compared to the reaction using plasma only and the Fe–Mn catalyst. The highest EO conversion (91.9%) and CO 2 selectivity (78.9%) were obtained over the Fe–Mn–Co catalyst at a specific energy input (SEI) of 730.2 J l −1 . Moreover, the presence of water vapor improved EO conversion and CO 2 selectivity in the relative humidity (RH) range of 0–60%, while further increasing the RH to 80% reduced EO conversion. The interactions between Fe, Mn and dopants increased the specific surface area and pore volume of the Fe–Mn-X catalyst, while maintaining the crystalline structure of the catalysts. The presence of the dopants enhanced the reducibility of the Fe–Mn-X catalysts and produced more surface adsorbed oxygen (O ads ) on the catalyst surfaces. Moreover, the interactive effects among the Fe, Mn and dopants facilitated the plasma-catalytic oxidation reactions via enhanced surface reactions. The coupling of plasma with the Fe–Mn–Co catalyst reduced the formation of organic by-products in the plasma-catalyzed oxidation of EO.
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