ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Ping Xue,Xin Pan,Jiming Huang,Yijun Gao,Wei Guo,Junsheng Li,Mi Tang,Zhengbang Wang
Construction of porous metal–organic framework (MOF)/covalent organic framework (COF) hybrid photocatalysts for enriched structures and unprecedented properties is still a great challenge but highly desirable. Herein, a new series of Cu3(HHTP)2-MOF/Tp-Pa-1-COF hybrids with different MOF content are successfully fabricated. The as-prepared MOF/COF hybrids exhibit intimate interaction based on the coordination of Cu ions with the carbonyl oxygen and enamine nitrogen groups in Tp-Pa-1. The integrated conductive Cu3(HHTP)2 is able to act as an excellent electron extractor instead of noble metal cocatalysts to significantly promote the charge transfer and inhibit the recombination of photogenerated electron–hole pairs. As a results, the optimized photocatalyst with Cu3(HHTP)2:Tp-Pa-1 ratio of 1:15 achieves the highest hydrogen evolution rate of 1.76 mmol·h–1·g–1 under visible-light irradiation, which is about 93 times higher than that of the pure Tp-Pa-1 and even slightly higher than that of the Tp-Pa-1 with Pt (3 wt %) as a cocatalyst.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yu Sun,Jinyong Hu,Yong Zhang
Transition metal dichalcogenides (TMDs) have been received widespread attention for NO 2 detection at room temperature . However, the TMDs-based gas sensors usually possess inferior response capability and suffer from humidity interference due to lack of sufficient reaction activation energy , which seems tough to achieve the detection of ppb-level gases and hinder the practical applications. Herein, we propose a visible light-assisted-type gas sensor based on Au-decorated WS 2 , endowing high-performance detection of NO 2 at room temperature. Benefited from the localized surface plasmon resonance (LSPR) enhancement effect induced by the modified Au nanoparticles (NPs), the visible light-assisted Au/WS 2 gas sensor can implement the detection of NO 2 gas as low as 20 ppb. Moreover, the maximum drift of the sensor response value is only 3% in the range of 10%−90% RH, indicating the stabilized anti-humidity ability. The effective regulation of transmission channel by the modified noble metal and the enhancement of visible light absorption of WS 2 through taking full advantage of the LSPR effect are the main reasons for realizing low concentration detection and improving the anti-humidity ability. Therefore, the visible light-assisted gas detection mode can serve as a proof-of-concept to provide an effective approach for the detection of trace gases at room temperature.
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DYES AND PIGMENTS
·
2015
·
IF 3.966
Yi Chen,Wenqing Liang,Wing Hong Choi,Jinhai Huang,Qingchen Dong,Furong Zhu,Jianhua Su
Two novel host materials based on 5- and 9-substituted benzocarbazole have been developed for application in phosphorescent organic light-emitting diodes. Both host materials exhibit excellent thermal stability with high decomposition temperatures of ca.515 °C, while the 9-substituted benzocarbazole derivative exhibits a high glass transition temperature of 181 °C. Additionally, the electroluminescence characteristics of green phosphorescent organic light-emitting diodes made with two new host materials were also evaluated. The devices exhibited an electroluminescent emission peak at 528 nm with CIE coordinates of (0.31, 0.64) and possessed low turn-on voltages of <2.84 V.
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Catalysts
·
2020
·Vol. 10
·期 1
·138
·
IF 3.52
Di Wu,Kequan Xia,Chengzhu Fang,Xuegang Chen,Ying Ye
Azo dyes are the most widely used synthetic dyes in the printing and dyeing process. However, the discharge of untreated azo dyes poses a potential threat to aqueous ecosystems and human health. Herein, we fabricated a novel heterogeneous catalyst: activated-carbon-fiber-supported ferric alginate (FeAlg-ACF). Together with peroxymonosulfate (PMS) and visible light, this photocatalytic oxidation system was used to remove an azo dye—azophloxine. The results indicated that the proposed catalytic oxidation system can remove 100% of azophloxine within 24 min, while under the same system, the removal rates were only 92% and 84% when ferric alginate was replaced with ferric citrate and ferric oxalate, respectively, which showed the superiority of FeAlg-ACF. The degradation of azophloxine is achieved by the active radicals (SO4•−and •OH) released from PMS and persistent free radicals from activated carbon fiber. Moreover, due to ferric alginate’s highly intrinsic photosensitivity, visible radiation can further enhance the ligand-to-metal charge transfer (LMCT) processes. After 24 min of treatment, the total organic carbon of the azophloxine solution (50 μmol/L) decreased from 1.82 mg/L to 79.3 μg/L and the concentration of nitrate ions increased from 0.3 mg/L to 8.6 mg/L. That is, up to 93.5% of azophloxine molecules were completely degraded into inorganic compounds. Consequently, potential secondary contamination by intermediate organic products during catalytic degradation was prohibited. The azophloxine removal ratio was kept almost constant after seven cycles, indicating the recyclability and longevity of this system. Furthermore, the azophloxine removal was still promising at high concentrations of Cl−, HCO3−, and CO32−. Therefore, our proposed system is potentially effective at removing dye pollutants from seawater. It provides a feasible method for the development of efficient and environmentally friendly PMS activation technology combined with FeAlg-ACF, which has significant academic and application value.Keywords:peroxymonosulfate;ferric alginate;activated carbon fiber;visible radiation;heterogeneous photocatalysis
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MOLECULES
·
2023
·Vol. 28
·期 7
·3048
·
IF 4.6
Dejia Geng,Lei Chen,Sinan Du,Xiang Yang,Huaguang Wang,Zexin Zhang
The immense potential of active colloids in practical applications and fundamental research calls for an efficient method to synthesize active colloids of high uniformity. Herein, a facile method is reported to synthesize uniform organic–inorganic hybrid active colloids based on the wetting effect of polystyrene (PS) with photoresponsive inorganic nanoparticles in a tetrahydrofuran/water mixture. The results show that a range of dimer active colloids can be produced by using different inorganic components, such as AgCl, ZnO, TiO2, and Fe2O3nanoparticles. Moreover, the strategy provides a simple way to prepare dual-drive active colloids by a rational selection of the starting organic materials, such as magnetic PS particles that result in light and magnet dual-drive active colloids. The motions of these active colloids are quantified, and well-controlled movements are demonstrated.Keywords:active colloids;polymeric colloids;wetting effects
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RSC Advances
·
2015
·Vol. 5
·期 84
·68953-68963
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IF 3.84
Xi Chen,Banghong Zhou,Shuanglei Yang,Hanshuo Wu,Yuxin Wu,Laidi Wu,Jun Pan,Xiang Xiong
Herein, a strong heterojunction, consisting of SnO2 nanoparticles grown on layered g-C3N4 nanosheets, was rationally designed and successfully synthesized via a facile hydrothermal method. The morphology, chemical structure, optical and electronic properties of the obtained SnO2/g-C3N4 hybrid nanocomposites were characterized. Furthermore, the photocatalytic activity of the novel photocatalysts was assessed. The results clearly indicate that the SnO2/g-CN-72.12% nanocomposite photocatalysts shows a stable cycle performance and exhibits significantly enhanced photocatalytic activity, which is 89 and 17 times higher than those of pure SnO2 and g-C3N4, respectively. The synergistic effect of the SnO2/g-C3N4 heterojunction can effectively accelerate the separation of photo-generated carriers and enhance the efficiency of interfacial charge transfer, which are proposed to be responsible for the enhancement of the photocatalytic activities. This study provides a low-cost and large-scale synthesis route for the production of visible light responsive photocatalysts that have potential in environmental purification applications.
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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2021
·Vol. 118
·期 42
·e2104481118
·
IF 11.205
Jintao Tong,Dalei Wang,Ye Liu,Xin Lou,Jiwei Jiang,Bin Dong,Renfeng Dong,Mingcheng Yang
In nature, microorganisms could sense the intensity of the incident visible light and exhibit bidirectional (positive or negative) phototaxis. However, it is still challenging to achieve the similar biomimetic phototaxis for the artificial micro/nanomotor (MNM) counterparts with the size from a few nanometers to a few micrometers. In this work, we report a fuel-free carbon nitride (C3N4)/polypyrrole nanoparticle (PPyNP)-based smart MNM operating in water, whose behavior resembles that of the phototactic microorganism. The MNM moves toward the visible light source under low illumination and away from it under high irradiation, which relies on the competitive interplay between the light-induced self-diffusiophoresis and self-thermophoresis mechanisms concurrently integrated into the MNM. Interestingly, the competition between these two mechanisms leads to a collective bidirectional phototaxis of an ensemble of MNMs under uniform illuminations and a spinning schooling behavior under a nonuniform light, both of which can be finely controllable by visible light energy. Our results provide important insights into the design of the artificial counterpart of the phototactic microorganism with sophisticated motion behaviors for diverse applications.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2022
·
IF 4.383
Adil Raza,Azhar Ali Haidry,Jaffer Saddique
Efficient solar to chemical energy conversion by promising semiconductor-based photocatalysis has gained huge interest due to being a potential solution for environmental remediation and energy problems. Though, the inadequate photogenerated charge separation practically limits the photocatalytic efficiency. Herein, mesoporous g-C 3 N 4 (CN) nanosheets coupled Cu 2 ZnSnS 4 (CZTS) hybrid composite as visible-light-driven photocatalyst is synthesized by a facile in situ hydrothermal self-assembly method and investigated for CO 2 photocatalytic reduction. The hybrid composite shows a slight red shift to the visible region with enhanced optical absorption . Under visible light irradiation, experimental results exhibit CZTS-CN hybrid composite has CO/CH 4 yield rates of 12.01/3.76 μmol g −1 after 5h, which are 1.54/1.41 times higher in comparison with bare CN. The heterojunction formation between CZTS and g-C 3 N 4 is restraining the electron-hole recombination and improves the photocatalytic performance. Finally, acceptable underlying mechanisms for CO 2 photocatalytic reduction over CZTS-CN hybrid composite are proposed. This work may inspire readers to provide sufficient guidance to design high-performance photocatalysts.
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CERAMICS INTERNATIONAL
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2021
·
IF 4.527
Weijie Lei,Hao Wang,Xiaojing Zhang,Zhimao Yang,Chuncai Kong
As competitive photocatalysts , Cu 2 O nanoparticles meet with severe photogenerated carries recombination and insufficient light absorption, leading to the poor photocatalytic performance. Herein, the truncated Cu 2 O-Au (CA) binary and Cu 2 O-Au-TiO 2 (CAT) ternary octahedra with Au nanoparticles (Au NPs), preferentially supported on the (110) and (100) planes of Cu 2 O, are synthesized for efficient photocatalytic degradation reactions. The photodegradation rates of MO of CA1 (Cu 2 O-Au containing 1 wt % Au) and CAT are as high as 95.61% and 96.5% under 60 min of visible light irradiation, respectively. On the one hand, the synergistic function of localized surface plasmon resonance (LSPR) of Au NPs and Schottky barrier accelerate the separation and transfer of photogenerated carriers. On the other hand, a Z-scheme electron transfer system is constructed in CAT to promote the photodegradation performance. According to the finite-difference-time-domain (FDTD) simulation result, there is a strong electric field enhancement at the contact sites between Au, Cu 2 O and TiO 2 , which accelerates the electron transfer to a large extent and separates the electron-hole pairs. Therefore, this work may provide an approach for the synthesis and applications of multiple heterostructure catalyst.
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Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 42
·16147-16156
·
IF 8.067
Hailiang Fang,Beiying Zhou,Jiancheng Wang,Xiaobo Hu,Zesheng Pan,Shengjie Fan,Ping Huang,Shijia Gu,Lianjun Wang,Wan Jiang
Due to high thermal conductivity and excellent laser irradiation resistance, composite phosphor ceramics (CPCs) have been widely acknowledged as ideal color converters in laser lighting. However, achieving high-efficiency laser lighting is significantly limited by the inefficient utilization of pumping light. Microstructural tailoring is recognized as a promising strategy to improve the light extraction efficiency, while it is restricted by the harsh preparation conditions. Herein, we propose a novel Y2O3-YAG:Ce CPC controllably prepared from mesoporous Y2O3 powders and YAG:Ce phosphors using spark plasma sintering at a low temperature of 1160 °C. Attributed to the introduced Rayleigh scattering centers tailored by fine ceramic grains and well-matching of refractive indexes between the phosphor and the matrix, the Y2O3-YAG:Ce CPC exhibits an ultra-high relative internal quantum efficiency of 107% compared to that of the YAG:Ce phosphor. Impressively, when irradiated under a 450 nm laser diode, the as-prepared CPC produces white light with a high luminous efficiency of 178.42 l m W−1 and a low correlated color temperature of 4638 K, reflecting the enhanced light conversion efficiency. Furthermore, the CPC presents a remarkable improvement in thermal stability (only 6% luminescence loss at 200 °C) and is able to withstand a high laser flux density up to 6.16 W mm−2. These results demonstrate that the optimized Y2O3-YAG:Ce CPCs with designed microstructures are well suited for solid-state laser lighting with high power and brightness.
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Polymers
·
2021
·Vol. 13
·期 22
·3977
·
IF 4.329
Chenglong Wang,Luyang Qiao,Qiang Zhai,Kai Yan,Lili Wang,Jinhuan Zheng
Herein, a polyurethane acrylate-based TiO2(PU-TiO2) was fabricated using a two-step method. First, a polyurethane prepolymer was prepared. Second, PU-TiO2was prepared using amino-modified TiO2(A-TiO2). The best synthesis process of the polyurethane prepolymer was when the reaction temperature was 80 °C, the reaction time was 3 h and theR-value of the polyurethane acrylate was 2. Next, the influence of the A-TiO2content on the structure and performance of PU-TiO2was examined. The analysis of the rheological properties of the PU-TiO2ink indicated that its viscosity gradually increased as the A-TiO2content increased. The tensile performance of film improved because of the presence of A-TiO2. The photo-polymerisation and photo-rheological performance indicated that the PU-TiO2structure changed from a hyperbranched structure with TiO2as the core to a segmented structure, as the A-TiO2content was 3%.Keywords:polyurethane acrylate-based TiO2;polyurethane prepolymer;A-TiO2;hyperbranched structures;blue light-curable ink
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Nature Communications
·
2020
·Vol. 11
·期 1
·1-11
·
IF 12.121
Zhu Qing Li,Du Cong,Dai Yahao,Daab Matthias,Matejdes Marian,Breu Josef,Hong Wei,Zheng Qiang,Wu Zi Liang
Many creatures have the ability to traverse challenging environments by using their active muscles with anisotropic structures as the motors in a highly coordinated fashion. However, most artificial robots require multiple independently activated actuators to achieve similar purposes. Here we report a hydrogel-based, biomimetic soft robot capable of multimodal locomotion fueled and steered by light irradiation. A muscle-like poly( N -isopropylacrylamide) nanocomposite hydrogel is prepared by electrical orientation of nanosheets and subsequent gelation. Patterned anisotropic hydrogels are fabricated by multi-step electrical orientation and photolithographic polymerization, affording programmed deformations. Under light irradiation, the gold-nanoparticle-incorporated hydrogels undergo concurrent fast isochoric deformation and rapid increase in friction against a hydrophobic substrate. Versatile motion gaits including crawling, walking, and turning with controllable directions are realized in the soft robots by dynamic synergy of localized shape-changing and friction manipulation under spatiotemporal light stimuli. The principle and strategy should merit designing of continuum soft robots with biomimetic mechanisms.
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