Nano-Micro Letters
·
2021
·Vol. 14
·期 1
·1-11
·
IF 16.419
Liu Shihao,Zang Chunxiu,Zhang Jiaming,Tian Shuang,Wu Yan,Shen Dong,Zhang Letian,Xie Wenfa,Lee Chun-Sing
Here, this work presents an air-stable ultrabright inverted organic light-emitting device (OLED) by using zinc ion-chelated polyethylenimine (PEI) as electron injection layer. The zinc chelation is demonstrated to increase the conductivity of the PEI by three orders of magnitude and passivate the polar amine groups. With these physicochemical properties, the inverted OLED shows a record-high external quantum efficiency of 10.0% at a high brightness of 45,610 cd m −2 and can deliver a maximum brightness of 121,865 cd m −2 . Besides, the inverted OLED is also demonstrated to possess an excellent air stability (humidity, 35%) with a half-brightness operating time of 541 h @ 1000 cd m −2 without any protection nor encapsulation.
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JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Jingwei Liu,Yanjie Liang,Shao Yan,Dongxun Chen,Shihai Miao,Fei Xie,Weili Wang
Near-infrared (NIR, 700–900 nm) emissive persistent phosphors have been given substantial attention in the past decade due to their bright future for many advanced applications from night vision surveillance to biomedical imaging. Here, we report the intense NIR persistent luminescence from a series of Bi 2+ -activated persistent luminescence materials achieved by the cation disorder strategy in CaSnO 3 host. Taking Ca 0 . 95 (Na,Gd) 0.025 SnO 3 :Bi 2+ as an example, it exhibits long-lasting NIR afterglow with a peak maximum at 805 nm assigned to the 2 P 3/2 (1)→ 2 P 1/2 transition of Bi 2+ and a long persistence time of more than 24 h after the ceasing of external excitation. More importantly, NIR self-sustained luminescence can be triggered by wideband irradiation with ultraviolet to visible light over 230–550 nm. As expected, 365 nm UV lamp, natural sunlight and LED flash can all effectively charge these NIR persistent phosphors and induce commendable NIR persistent luminescence performance. Considering the invisibility of NIR emission to the naked eye, very broad persistent luminescence excitation band, and long-lasting NIR luminescence after excitation, these Bi 2+ -activated NIR persistent phosphors are expected to find important applications in optical information storage and anti-counterfeiting fields.
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Green Chemical Engineering
·
2021
·
IF 0
Qingping Xin,Xueting Cao,Dandan Huang,Shuo Li,Xinghui Zhang,Guangyu Xuan,Mengting Wei,Lei Zhang,Xiaoli Ding,Yuzhong Zhang
One type of new light-responsive hierarchical metal organic framework (MOF) has been successfully prepared using Co(NO 3 ) 3 ·6H 2 O as the metal salt and 4,4′-azobenzenedicarboxylic acid as the ligand by microwave method for the first time. It is found that MOF [Co(AzDC)] exhibits a light-responsive characteristic to SO 2 adsorption due to the presence of azo group from the ligand. The light-responsive hierarchical MOFs are incorporated into Matrimid® 5218 (PI) matrix to prepare mixed matrix membranes (MMMs) for gas separation application. The morphology, crystallinity, chain mobility and thermal stability of MMMs are explored. Results show that Co(AzDC) may elevate both the CO 2 (SO 2 ) permeability and CO 2 (SO 2 )/N 2 selectivity of the MMMs. In particular, the Co(AzDC) doped MMMs exhibit the significantly improved CO 2 (SO 2 )/N 2 selectivity from 33 (123) for PI control membrane to 78 (420) for MMMs, overcoming the 2008 Robeson upper bound for CO 2 /N 2 system. Size-sieving effect of Co(AzDC) with pore size 0.35 nm enhances the selectivity, while the –N=N– group from Co(AzDC) shows affinity to CO 2 molecular rather than N 2 , also elevating selectivity of MMMs. In brief, enhanced selectivity of high-performance membrane is attributed to incorporation of Co(AzDC) particles, which displays synergistic effects both in size-sieving and CO 2 -philic interaction for CO 2 /N 2 separation. Smart highly selective interface is constructed in MMMs by switching the configuration of MOFs from cis to trans . The SO 2 permeability and SO 2 /N 2 selectivity of MMMs are investigated under both visible light and ultraviolet light states, and the SO 2 /N 2 separation performance under visible light is notably improved in comparison with that under ultraviolet light state.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Jianing Li,Qiancheng Zhang,Juming Liu,Mengran Yu,Huiyan Ma,Jucai Yang,Sheng Ye,Tomas Ramirez Reina,Jian Liu
It still remains challenge for expanding the photo-response range of TiO 2 with dominant {0 0 1} facets due to the hardly achieving modification of the electronic structure without destroying the formation of TiO 2 high energy facets. Herein, we report the construction of carboxylate species modified TiO 2 nanosheets with dominant {0 0 1} facets by employing ethanol as a carbon source through a low-temperature (300 °C) carbonization method. The as-obtained samples were investigated in detail by using various characterization techniques. The results indicate that the carboxylate species derived from the oxidation and carbonization of ethanol are coordinated to the {0 0 1} facets in a bidentate bridging mode. The electron-withdrawing carboxylate species induce TiO 2 to form a lower valence band edge and a narrower bandgap, which enhances the oxidation ability of photogenerated holes and expands the photo-response range. The partially carbonized carboxylate species can also act as a photosensitizer to induce visible-light photocatalytic activity of TiO 2 nanosheets. In addition, the carboxylate species can further promote the separation of photogenerated charge carriers. The findings of this work may provide a new perspective for tuning the band structure of TiO 2 with dominant {0 0 1} facets and improving its photocatalytic performance.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 3
·1936-1940
·
IF 1.134
Chen Guochang,Zhu Mingming,Wang Lichun,Wu Xingrong
In this investigation, AgBr/g-C3N4 composite as an effective LED-irradiation photocatalyst was synthesized via a one-pot method. In this composite, the colloidal spheres of AgBr were uniformly dispersed on the g-C3N4 nanosheets, which were
characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis diffused reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The introduction of g-C3N4
nanosheets improved the stability and optimized the spatial charge carrier transfer compared to pristine AgBr, hence exhibited excellent activities toward the degradation of methyl orange (MO) as evidenced by the discoloration rate of MO by 94.8% after 120 min of irradiation. Also, the mechanism
based on the band structures and microstructures of the catalysts was then proposed.
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ChemPhotoChem
·
2022
·Vol. 6
·期 8
·e202200067
·
IF 3.679
Yaoqiang Wang,Yu Jin,Zishuai Wang,Gang Xiao,Haijia Su
Graphical Cascading : A two-pot, light-dark cascade NADH regeneration procedure was developed. First, g-C 3 N 4 nanosheets photocatalyzed the conversion of triethanolamine (TEOA) to glycolaldehyde, which reduced NAD+ to NADH in the dark reaction step, thus avoiding the photo-deactivation of NADH. Photocatalytic regeneration of NAD(P)H is a green and promising method which utilizes clean solar energy. However, we found in this study that light exposure of NADH will cause the deactivation of the regenerated NADH. Therefore, we used ultrathin g-C 3 N 4 nanosheets as photocatalyst and developed a two-pot light-dark cascade procedure for NADH regeneration to avoid the light exposure and the deactivation of NADH. This two-pot procedure included a first light reaction step where triethanolamine was converted to glycolaldehyde through visible light photocatalysis which could reduce NAD + to NADH through a non-catalytic process in the followed dark reaction step. Using this procedure, the NADH productivity reached 1.625 mmol ⋅ h −1 ⋅ g −1 and was about 29 times higher that obtained in the one-pot method. The regenerated NADH using the two-pot procedure could act as cofactor of alcohol dehydrogenase to catalyze the reduction of acetaldehyde, illustrating the application potential of this procedure to aid enzyme catalyzed redox reactions.
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高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Lei Wang,Enhai Song,Shuai Zhang,Xiaoshi Hou,Xiaohong Ji,Qinyuan Zhang
Doping is one of the important technologies for modifying the properties of two-dimensional (2D) transition metal dichalcogenides (TMDs). Herein, ultrathin Er-doped MoS2 nanosheets with an enhanced visible-light response have been synthesized by a wet-chemical method. The few-layer characteristic of the MoS2:Er nanosheets is beneficial from the H2S generated during the preparation process. Near-infrared emission at ∼1530 nm from MoS2:Er nanosheets has been observed under 980 nm laser excitation, which corresponds to the energy transition from 4I13/2 to 4I15/2 of Er3+. Meanwhile, the enhanced visible-light response of MoS2:Er has been demonstrated by the photocatalytic performance (removing rhodamine B) and photocurrent response compared with undoped MoS2. Based on the experiments and density functional theory calculation, the enhanced visible-light response is attributed to the improved separation capability of photogenerated electron–hole pairs of the ultrathin MoS2:Er nanosheets. Er-doping induces an increase of S vacancies and the energy transfer between Er3+ ions and the host. The work demonstrates a developed universal and recyclable synthesis strategy for various metal-doped MoS2 nanosheets and their applications in the fields of photocatalysis and photodetection.
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Xiaoqian Zhang,Yixiao Wu,Abdulmoseen Segun Giwa,Juxia Xiong,Shaobin Huang,Lishan Niu
Biochar (C) applied in synthesizing photocatalysts to eliminate water pollution has been intensively investigated. Herein we report the first use of biochar pyrolyzed from food wastes at 400 ° C (400C) and 700 ° C to construct C/BiOBr composites via a facile hydrolysis approach. Photocatalytic performances could be significantly improved by choosing the appropriate carbonization temperature and adjusting the content of C in C/BiOBr composites. The prepared 1%400C/BiOBr exhibited the best photodegradation capacity towards methylene orange (20 mg/L) and tetracycline (50 mg/L). A series of characterization results illustrated that smooth structure and surface properties (oxygen functional groups and persistent free radicals) of 400C played an important role in enhancing the photocatalytic activities. Mechanism exploration suggested that h + and ˙O 2 − were the main active species thus contributing to photodegradation. This study provided a new insight into utilization of biochar derived from food wastes in photocatalysis and environmental remediation.
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高影响因子
Polymers
·
2022
·Vol. 14
·期 14
·2760
·
IF 4.967
Yu Ren,Ziyao Zhao,Wenwen Jiang,Guangyu Zhang,Yuxin Tan,Yongyin Guan,Long Zhou,Li Cui,Sung Woong Choi,Mei-Xian Li
In this study, Y2O3/TiO2-loaded polyester fabric was prepared to improve the catalytic activity of the TiO2and to increase its reuse efficiency. The samples were systematically characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), and infrared spectroscopy (FT-IR). Furthermore, the degradation performance of methyl orange in the presence of simulated visible light irradiation was also investigated. The results showed that the TiO2in the Y2O3/TiO2composite photocatalyst was suitably anatase. In addition, Y2O3/TiO2-loaded polyester fabric had higher photocatalytic performance than that of pure polyester fabric under visible light and the degradation rate reached 83% after 120 min of light exposure but remained above 50% after repeated exposure (three times). Compared to the pure polyester fabric, Y2O3/TiO2-loaded polyester fabric had self-cleaning effects in methyl blue and soy sauce solutions under visible light.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Ning Li,Mengting He,Xukai Lu,Lan Liang,Rui Li,Beibei Yan,Guanyi Chen
A valence-state heterojunction Mn 3 O 4 /γ-MnOOH was synthesized for norfloxacin (NOR) degradation under concurrent visible light and magnetic field. The charge carriers could transfer between the valence state components facilely, inhibiting recombination of photo-induced electron-holes significantly. Efficient NOR degradation by Mn 3 O 4 /γ-MnOOH was realized at 98.8% (rate constant of 0.0720 min −1 ) within 60 min under magnetic field assisted visible light. In neutral media, the positively charged NOR and negatively charged Mn 3 O 4 /γ-MnOOH would arrange in an oriented manner in the presence of magnetic field, providing more active sites for NOR during photocatalysis . Moreover, the opposite Lorentz forces contributed to the attractive interactions between NOR and Mn 3 O 4 /γ-MnOOH, accelerating NOR degradation with lower active energy. Quenching experiment showed that ∙O 2 − and h + played dominant roles in NOR degradation. Attractively, this study shed new lights on an innovative strategy of magnetic field assisted photocatalysis for refractory contaminants remediation from water.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Liubing Fan,Kunjie Liu,Qindan Zeng,Mingyang Li,Hao Cai,Jun Zhou,Shihui He,Jing Zhao,Quanlin Liu
Organic–inorganic hybrid metal halides have attracted widespread attention as emerging optoelectronic materials, especially in solid-state lighting, where they can be used as single-component white-light phosphors for white light-emitting diodes. Herein, we have successfully synthesized a zero-dimensional (0D) organic–inorganic hybrid mixed-metal halide (Bmpip)2PbxSn1–xBr4 (0 < x < 1, Bmpip+ = 1-butyl-1-methyl-piperidinium, C10H22N+) that crystallizes in a monoclinic system in the C2/c space group. Pb2+ and Sn2+ form a four-coordinate seesaw structure separated by organic cations forming a 0D structure. For different excitation wavelengths, (Bmpip)2PbxSn1–xBr4 (0 < x < 1) exhibits double-peaked emission at 470 and 670 nm. The emission color of (Bmpip)2PbxSn1–xBr4 can be easily tuned from orange-red to blue by adjusting the Pb/Sn molar ratio or excitation wavelength. Representatively, (Bmpip)2Pb0.16Sn0.84Br4 exhibits approximately white-light emission with high photoluminescence quantum yield up to 39%. Interestingly, the color of (Bmpip)2PbxSn1–xBr4 can also be easily tuned by temperature, promising its potential for application in temperature measurement and indication. Phosphor-converted light-emitting diodes are fabricated by combining (Bmpip)2PbxSn1–xBr4 and 365 nm near-UV LED chips and exhibit high-quality light output.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Min Wang,Guanghua Lu,Runren Jiang,Tianjian Dang,Jianchao Liu
In view of the increasing threat of overuse of broad-spectrum antibiotics to water environment, here, a series of small molecular intercalated bismuth oxychloride (SBC-X) composite photocatalysts were successfully constructed by a simple stirring synthesis at room temperature. Among them, SBC-0.5 showed excellent photocatalytic performance against the three target broad-spectrum antibiotics in visible light, which was 3.06 times, 5.93 times and 11.64 times higher than that of monomer for degrading tetracycline, norfloxacin and ciprofloxacin, respectively. Through analysis, it was found that the excellent photocatalytic degradation performance of SBC-0.5 was mainly attributed to the greatly improved specific surface area, which increased to 14 times of monomer, providing a large number of reaction sites for the subsequent photocatalytic degradation. Besides, intercalated molecules as charge transfer bridges between nanosheets greatly accelerated the efficiency of photogenerated charge transfer between layers. Free radical trapping experiments and electron spin resonance indicated that superoxide anion radicals played a major role in the photocatalytic degradation, followed by singlet oxygen. Furthermore, nine potential degradation intermediates were identified, and the toxicity was greatly reduced confirmed by ECOSAR software prediction and soybean seed germination and seeding growth experiment. Our work will provide useful information for the purification of wastewater containing antibiotics.
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高影响因子
危险品化学品经营许可证（带存储）