NANOTECHNOLOGY
·
2019
·Vol. 31
·期 6
·065603
·
IF 3.399
Chun Sun,Le Wang,Sijing Su,Zhiyuan Gao,Hua Wu,Zi-hui Zhang,Wengang Bi
White light-emitting diodes (WLEDs) based on all-inorganic perovskite CsPbX3 (X = Cl, Br, I) quantum dots (QDs) have attracted much attention and rely on mixing several colors of perovskites. However, this inevitably leads to a non-uniform light distribution and serious light loss. Here, a novel strategy was demonstrated to obtain white emission by combining the orange and blue emission from CsPb/Mn(Cl/Br)3 QDs. Notably, highly efficient white emission with a photoluminescence quantum yield of 94% was achieved by an anion exchange surface engineering (AESE) strategy. After AESE treatment the surface traps can be eliminated, resulting in improved exciton and Mn2+ emission. A prototype WLED device was fabricated and exhibited excellent optical stability, demonstrating great potential for perovskite QDs in the field of optoelectronics.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 4
·2208841
·
IF 19.924
Jinshuai Zhang,Chun Li,Yin Liang,Jiepeng Song,Qiuyu Shang,Liyun Zhao,Huifeng Tian,Lei Liu,Qing Zhang
Suspended nano/microstructures on semiconductor surfaces that can manage light are attractive for various on-chip and efficiency-enhanced optoelectronics. Hybrid halide perovskites have shown considerable potential for optoelectronic and photonic applications. However, the ionic and soft lattices of perovskites are sensitive to polar solvents, photons, and heat, limiting the post-processing of suspended microstructures. Herein, a solution-processed selective area homoepitaxial growth (SAEG) method is introduced to create well-ordered, suspended microstructure arrays on the surface of MAPbX 3 (X = Br, Cl) single-crystalline thin films. The suspended micro-arrays exhibit single crystalline structures and 11.2 fold photoluminescence enhancement compared to the thin-film substrates. The success of SAEG lies in the making use of perovskite supersaturated HX aqueous solutions that not only repair surface defects induced by lithography but also satisfy homoepitaxial growth kinetics. This study paves a pathway for the fabrication of cost-effective perovskite surface-suspended microstructures for efficiency-enhanced and on-chip optoelectronic devices.
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ENVIRONMENTAL TECHNOLOGY
·
2019
·
IF 1.918
Yao Kun,Jia Manke,Wu Huanhuan,Li Yonggang,Chen Chuncheng,Huang Yingping
Cl− in industrial wastewater from glyphosate production has been used as Cl source to synthesize BiOCl photocatalyst via a simple solvothermal route. The crystalline, morphology, specific surface area and optical properties of photocatalysts prepared under various conditions have been investigated. BiOCl photocatalyst prepared in acidic solution shows the highest crystallinity and without impurities and microcellular structure. The degradation of industrial wastewater contaminants demonstrates the possibility of this BiOCl used in industrial wastewater treatment and phosphorus recycling through the subsequent phosphorus recovery processes. This study not only sheds light on the possibility of photocatalysts’ preparation in situ using industrial wasterwater as raw materials and the feasibility of using photocatalysis technology in wastewater treatment area, but also the chloride ions have been removed as an available resource and the corrosion to treatment facilities has been slowed down. The phosphorus and nitrogen resources can be recycled by other subsequent recycle recoveries. It offers a novel way for the wastewater treatment process in succession from photocatalysts’ manufacture to contaminants disposal.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Yunhuan Chen,Xinyue Liu,Rui Zhang,Weier Wang,Hailong Wang,Yongsheng Ren,Xiaoxiao Duan
High permselectivity and antifouling/self-cleaning nanofiltration (NF) membranes are ideal materials for water treatment, and this vision is expected to be reached through the design of multifunctional self-cleaning interfaces. In this study, we employed metal - polyphenol network (MPN) to mediate in situ mineralization of porous substrates, enabling simultaneous modulation of interfacial polymerization (IP) and catalytic self-cleaning. The findings demonstrate that the mineralized layers employ an interlayer modulation strategy to produce a polyamide (PA) layer that is more hydrophilic, thinner, and structurally denser. As a result, the resulting PA-Fe 3 O 4 -PSF membrane exhibited a 2.5-fold increase in permeance (19.2 L m −2 h −1 bar −1 ) and a 7.3-fold enhancement in Cl − /SO 4 2− selectivity (66.4), compared to the control membrane (PA-PSF). Additionally, its highly polarized membrane surface significantly improved its antifouling performance. Compared to membranes with mineralized layers on the surface (Fe 3 O 4 -PA-PSF), PA-Fe 3 O 4 -PSF constructs a confined space that facilitates more efficient regeneration through in situ catalytic self-cleaning and ensures greater stability during multiple fouling-regeneration cycle operations. This study paves the way for fabricating multifunctional NF membranes with sustainable applications in material concentration, wastewater treatment, and environmental remediation.
研究领域:
水处理
·
膜科学
·
材料科学
·
环境工程
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yi-Ying Ma,Ze-Long Lu,Yun-Zhu Xing,Wei-Shi Zheng,Chun-Guang Liu
In this case, various characterization technologies have been employed to probe dissociation mechanism of cellulose in N , N -dimethylacetamide/lithium chloride (DMAc/LiCl) system. These results indicate that coordination of DMAc ligands to the Li + –Cl − ion pair results in the formation of a series of Li x (DMAc) y Cl z (x = 1, 2; y = 1, 2, 3, 4; z = 1, 2) complexes. Analysis of interaction between DMAc ligand and Li center indicate that Li bond plays a major role for the formation of these Li x (DMAc) y Cl z complexes. And the saturation and directionality of Li bond in these Li x (DMAc) y Cl z complexes are found to be a tetrahedral structure. The hydrogen bonds between two cellulose chains could be broken at the nonreduced end of cellulose molecule via combined effects of basicity of Cl − ion and steric hindrance of [Li (DMAc) 4 ] + unit. The unique feature of Li bond in Li x (DMAc) y Cl z complexes is a key factor in determination of the dissociation mechanism.
研究领域:
化学
·
材料科学
·
高分子科学
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SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Zi-Ming Zhou,Zhe Feng,Jun Zhou,Bi-Yun Fang,Zhi-Ya Ma,Bo Liu,Yuan-Di Zhao,Xue-Bin Hu
A new method is proposed for determination of carcino-embryonic antigen (CEA) based on quantum dot (QD)-modified aptamer probe by capillary electrophoresis-chemiluminescence (CE-CL) detection system. An oligonucleotide sequence A contains two parts, one is CEA aptamer and the other is bridging segment. Horseradish peroxidase (HRP) conjugates with sequence A (HRP-DNA A ) and then mixes with QD labeling complementary bridging segment (QD-DNA B ), forming HRP-DNA A-B -QD probe. When CEA exists, the specific combination of the aptamer in sequence A and CEA can form CEA/HRP-DNA A-B -QD complex. After separation of CEA/HRP-DNA A-B -QD complex and HRP-DNA A-B -QD probe by capillary electrophoresis (CE), the chemiluminescence (CL) catalyzed by CEA/HRP-DNA A-B -QD complex can be detected without any interference, and the content of CEA can be estimated by the CL intensity. It has been proved that the separation efficiency of HRP-DNA A-B -QD and CEA/HRP-DNA A-B -QD complex is improved greatly after QD modification, then the interference issue resulted from free HRP-DNA A-B -QD probe is solved well; and the specific combination of HRP-DNA A-B -QD and CEA leads to a closer distance of HRP and QD, then chemiluminescent resonance energy transfer (CRET) occurs, which confirms the validity of the strategy. Results show that the CL intensity has a linear relationship with the concentration of CEA in the range from 0.0654 to 6.54 ng/mL, and the limit of detection is approximately 8 pg/mL ( S / N = 3). This proposed method with high specificity has been applied for the accurate analysis of content of CEA in patient's serum.
研究领域:
分析化学
·
生物技术
·
纳米技术
·
医学诊断
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高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Wenzhi Wang,Liwei Wang,Shuo Song,Xinxin Guo,Hongyu Liu,Guangqiang Liu
All inorganic perovskite quantum dots (PQDs) have been studied extensively because of their excellent photoelectric properties. However, its poor stability and lead toxicity limit its practical application. At the same time, the complex synthesis conditions of the hot injection method also limited the preparation of large quantities. Here, we have successfully synthesized Mn-doped CsPb(Cl/Br) 3 PQDs with excellent thermal stability at room temperature by a simple supersaturation crystallization method. The synthesized Mn-doped CsPb(Cl/Br) 3 PQDs has good homogeneity and crystallinity. Meanwhile, Mn-doped CsPb(Cl/Br) 3 PQDs maintains the same crystal structure as CsPb(Cl/Br) 3 PQDs. Importantly, it was found that the activation energy of CsPb(Cl/Br) 3 PQDs after manganese doping increased from 65.1 meV to 222.8 meV through the high and low temperature PL test of 80 K–500 K. The crystal structure of CsPb(Cl/Br) 3 PQDs is more stable due to the introduction of manganese ion, and the thermal stability is significantly improved. In this study, manganese doped CsPb(Cl/Br) 3 PQDs with good crystallinity and thermal stability was rapidly synthesized by a simple supersaturation crystallization method at room temperature, which opened up a new way to improve the stability of PQDs and explore other non-toxic metal elements to replace Pb 2+ .
研究领域:
材料科学
·
纳米技术
·
化学
·
物理学
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高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2021
·Vol. 21
·期 12
·6073-6081
·
IF 0
Zhang Qian,Wang Bingxin,Hong Jun-Ming
The application of electrochemical catalytic oxidation in wastewater treatment with powerful Cldoped graphene as an anode has been discussed as a novel approach to degrade acetaminophen effectively. The characteristics of Cl-doped graphene that were related to Cl loading content and
microscopic morphology were analyzed by using several instruments, and the defects created by Cl doping were identified. Quenching experiments and electron paramagnetic resonance detection were proposed to clarify the mechanism underlying the production of active free radicals by Cldopedgraphene.
The degradation results indicated that efficiency increased with the percentage of Cl atoms doped into the graphene. The best degradation efficiency of acetaminophen could reach 98% when Cl-GN-12 was used. In the process of electrocatalytic oxidation, O•−
2,
and active chlorine, as the main active species, persistently attacked acetaminophen into open-ring intermediates, such as 4-chlororesorcinol, and finally into CO2 and H2O.
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Nature Communications
·
2026
·
IF 18.1
Yu Yang,Zhou Wei,Yuan Junshu,Zhou Xiaohan,Zhang Xuewei,Li Xuhan,Xia Xiao,Zhang Liqiang,Chen Yingjian,Meng Xiaoxiao,Wang Xingxing,Sun Fei,Gao Jihui,Zhao Guangbo
From the perspective of sustainable energy and green hydrogen, the critical challenge in seawater electrolysis lies in suppressing competitive chloride oxidation and corrosion at the anode. Despite the proposed protection mechanism based on surface reconstruction-derived anion repellence, a fundamental question of selectivity remains: why does the protective layer exclude Cl - but not the formally equivalent OH - ? We now redefine the connection between reconstruction and interfacial protection in NiFeS anodes to elucidate the origin of underlying selectivity. In-situ Raman, in-situ X-ray absorption spectroscopy, and molecular dynamic calculations further confirm that the reconstructed SO 4 2- establishes an enhanced hydrogen-bond network. This network significantly weakens the hydrogen-bonding strength of Cl - relative to H 2 O, thereby enhancing the discrimination between OH - and Cl - . In practical application, NiFeS demonstrates energy-saving seawater splitting performance (261.8 mV @ 100 mA·cm -2 ), long-term durability (2000 h @ 1.0 A·cm -2 ), and enables stable intermittent electrolysis (1500 start-stop cycles @500 mA·cm -2 ). When integrated into an anion exchange membrane cell, it shows promising electrolysis performance for industrial applications (1.970 V @ 1.0 A·cm -2 ).
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JOURNAL OF PHYSICAL CHEMISTRY A
·
2018
·
IF 2.836
Shuyan Wang,Lin Du,Jianqiang Zhu,Narcisse T. Tsona,Shijie Liu,Yifeng Wang,Maofa Ge,Wenxing Wang
Allyl acetate (AA) is widely used as monomer and intermediate in industrial chemicals synthesis. To evaluate the atmospheric outcome of AA, kinetics and mechanism of its gas-phase reaction with main atmospheric oxidants (O3, OH, Cl, and NO3) have been investigated in a Teflon reactor at 298 ± 3 K. Both absolute and relative rate methods were used to determine the rate constants for AA reactions with the four atmospheric oxidants. The obtained rate constants (in units of cm3 molecule–1 s–1) are (1.8 ± 0.3) × 10–18, (3.1 ± 0.7) × 10–11, (2.5 ± 0.5) × 10–10, and (1.1 ± 0.4) × 10–14, for reactions with O3, OH, Cl, and NO3, respectively. While results for reactions with O3, OH and Cl are in good agreement with previous studies, the kinetics for the reaction with NO3 is reported for the first time in this study. On the basis of determined rate constants, the tropospheric lifetimes of AA are τO3 = 9 days, τOH = 5 h, τCl = 5 days, τNO3 = 2 days. On the basis of the products study, reaction mechanisms for these oxidations have been proposed and the reaction products were detected using thermal desorption–gas chromatography–mass spectrometry (TD–GC–MS) and Fourier transform infrared spectroscopy (FTIR). Results show that the main products formed in these reactions are carbonyl compounds. In particular, 2-oxoethyl acetate was detected in all four AA oxidation reactions. Compared to previous studies, several new products were determined for reactions with OH and Cl. These results form a set of comprehensive kinetic data for AA reactions with main atmospheric oxidants and provide a better understanding of the degradation and atmospheric outcome of unsaturated acetate esters in the troposphere, during both daytime and nighttime.
研究领域:
大气化学
·
环境科学
·
反应动力学
·
空气污染
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高影响因子
JOURNAL OF PHYSICAL CHEMISTRY A
·
2017
·
IF 2.847
Jianqiang Zhu,Shuyan Wang,Narcisse T. Tsona,Xiaotong Jiang,Yifeng Wang,Maofa Ge,Lin Du
Rate constants at room temperature (293 ± 2 K) and atmospheric pressure for the reaction of methyl n-propyl ether (MnPE), CH3OCH2CH2CH3, with OH and NO3 radicals and the Cl atom have been determined in a 100 L FEP-Teflon reaction chamber in conjunction with gas chromatography-flame ionization detector (GC-FID) as the detection technique. The obtained rate constants k (in units of cm3 molecule–1 s–1) are (9.91 ± 2.30) × 10–12, (1.67 ± 0.32) × 10–15, and (2.52 ± 0.14) × 10–10 for reactions with OH, NO3, and Cl, respectively. The products of these reactions were investigated by gas chromatography-mass spectrometry (GC-MS), and formation mechanisms are proposed for the observed reaction products. Atmospheric lifetimes of the studied ether, calculated from rate constants of the different reactions, reveal that the dominant loss process for MnPE is its reaction with OH, while in coastal areas and in the marine boundary layer, MnPE loss by Cl reaction is also important.
研究领域:
大气化学
·
环境科学
·
化学动力学
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高影响因子
Functional Materials Letters
·
2024
·
IF 1.2
Zhuqing Sun,Yongxia Li,Haowen Bai,Shenghang Jin,Haibo Zhang,Guanying Cao
All inorganic lead halide cesium perovskite quantum dots (QDs) have attracted much attention due to their excellent luminescence properties, but further development is restricted by their stability and the existence of toxic element lead. In this paper, F/Mn-doped CsPb ( Br / Cl ) 3 QDs glass was prepared by melt quenching and heat treatment, with reduced Pb content effectively. The result shows that the spectrum of the QD glass is adjustable between 450 nm and 515.4 nm by changing the feeding ratio of Mn-Pb ion and heat treatment temperature. Moreover, the indraught of Mn 2 + effectively improves the PLQY of CsPb ( Br / Cl ) 3 QDs glass and serves as a red-emitting. The prepared composites not only maintain good fluorescence characteristics, but also greatly improve the stability of QDs. And successfully coupled with blue LED chips to synthesize WLED, Under 20 mA current, the color coordinate is (0.3446, 0.3389).
研究领域:
材料科学
·
纳米技术
·
光电子学
·
固体物理
·
无机化学
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