MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Fugang Xu,Meijuan Wu,Guangran Ma,Hui Xu,Wenjuan Shang
A new transitional metal sulfide-reduced graphene oxide hybrid Cu x S-MoS 2 -rGO was developed for enhanced electrocatalytic oxidation and amperometric sensing of glucose. The hybrid was prepared by a facile one-pot hydrothermal approach. The component and structure of the hybrid were characterized by SEM, EDS, XPS, XRD, and Raman spectrum. The MoS 2 -rGO forms a three-dimensional (3D) wrinkled porous matrix, and element Cu in the form of Cu x S (x = 1 or 2) is well dispersed in it. The introduction of Cu greatly elevates the catalysis, while MoS 2 plays a key role in forming 3D wrinkled and porous structure, while rGO obviously accelerates the electron transfer. Due to their synergy effect, the hybrid Cu x S-MoS 2 -rGO displays significantly enhanced catalysis towards glucose oxidation (40-fold enhanced oxidation current compared with that of MoS 2 or MoS 2 -rGO or nearly 40% increase than that of Cu x S-rGO). Based on this, a nonenzymatic amperometric sensor for glucose was developed, which shows a wide linear range of 2-6330 μM, a low detection limit of 0.6 μM, a high stability and adequate selectivity. For glucose sensing in human serum, the developed sensor shows recoveries between 97.2% and 101.2%. Such facile and high-yield approach can be used to prepare other multi-transitional metal sulfide hybrid with promising application in electrochemical sensor and electrocatalysis.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Hanxiao Yan,Min Yang,Li Liu,Jing Xia,Yiting Yuan,Junfang Liu,Yue Zhang,Su Nie,Xianyou Wang
SnS/C nanofibers membrane (SnS/C NFM) has been synthesized by low-temperature vulcanization from SnO 2 /C nanofiber membrane (SnO 2 /C NFM), which is obtained via electrospinning using commercial nano SnO 2 as raw material followed by high-temperature carbonization. This method not only forms the high conductivity and stable carbon fiber skeleton in high temperature but also avoids the losing of tin source. The self-standing SnS/C NFM shows outstanding electrochemical properties as anode for sodium-ion batteries (SIBs) without adding any conductive agent and binder. Additionally, it exhibits much better performance compared to SnO 2 /C NFM and nano SnO 2 particles. After 200 cycles at 200 mA g −1 , it can provide high capacity of 324 mA h g −1 (up to 84.8% capacity retention rate), and also display a good rate performance. Such superb electrochemical performance can be attributed to the interconnection of the 3D conductive network to enhance the electrical conductivity of SnS, and effectively suppress the aggregation of SnS particles during the cycling process. Therefore, the self-standing SnS/C NFM is considered as promise anode materials for sodium-ion batteries.
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LUMINESCENCE
·
2020
·Vol. 35
·期 8
·1350-1359
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IF 1.855
Liu Zhang,Yue Hou,Xiaoyan Guo,Wei Liu,Congcong Lv,Chunyang Zhang,Yan Jin,Baoxin Li
In this study, three types of Fe(III) bipyridyl or phenanthroline (Fe(III)-L 3 ) complex could directly catalyze 3,3′,5,5′-tetramethylbenzidine (TMB) to induce blue chromogenic changes without H 2 O 2 . Fe(III)-L 3 complex could induce a colour change in TMB directly after a short incubation time. Due to the high oxidase-like activity of the Fe(III)-L 3 complexes, superoxide anion radicals (O 2 •– ) were formed in solution. Intermediates radical involving oxo-iron species were then produced that oxidized TMB to its oxidation products (oxTMB), which had an absorbance maximum at 652 nm. Glutathione (GSH) could inhibit the oxidation reaction of the Fe(III)-L 3 complex–TMB system, a rapidly colorimetric method was established for the specific detection of GSH that had a detection limit of 0.1 μM. Furthermore, Fe(III)-L 3 complexes could catalyze TMB to oxTMB directly without H 2 O 2 . This fast and simple colorimetric method may open a new avenue for application in the point-of-care diagnosis field using the TMB chromogenic system.
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Journal of Materials Research and Technology-JMR&T
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2020
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IF 5.289
Chengli Yao,Jianglin Xu,Anjian Xie,Yuhua Shen
Nowadays, developing new anode material for lithium-ion batteries (LIBs) with distinguished electrochemical properties is still very significant and a huge challenge. Herein, a nanocomposite containing Co 9 S 8 /carbon (C)/nickel foam (NF) was synthesized. In the preparation process, ZIF-67 as the source of both Co 2+ and carbon was designedly grown in situ on the surface of NF with loose porous skeleton through the hydrothermal reaction. After sulfurization and pyrolysis of ZIF-67/NF, the porous flower-like Co 9 S 8 /C/NF composites formed. As a binder-free anode, Co 9 S 8 /C/NF exhibited excellent lithium storage performance, which showed a superior initial discharge capacity of 1926 mA h g −1 and reversible capacity of 1114 mA h g −1 after 200 cycles at 0.2 A g −1 . Even at 2 A g −1 current density, it could maintain a capacity of 578 mA h g −1 . The above outstanding electrochemical performances may be due to the following reasons. The loose flower-like structure assembled by lots of nanosheets, can provide a larger surface area for the transport and storage of Li + ions. With the cooperation of carbon matrix, the volume expansion of anodes can be effectively alleviated during charge and discharge process. At the same time, metal nickel foam as the current collector of the negative electrode also can increase the conductivity; promote the transport and diffusion of electrons. The loose skeleton enables the full contact of the active material with the electrolyte, which is beneficial to the transportation of Li + ions and electronics. This work provides an inspiration for designing and fabricating anode materials with distinguished-performance for LIBs.
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CHEMOSPHERE
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2020
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IF 5.778
Chao Chen,Jing Kang,Jimin Shen,Shengxin Zhao,Binyuan Wang,Zhonglin Chen,Qian Chen
Polyacrylonitrile fiber was successfully modified with triazine-based dendrimer via grafting method as a promising adsorbent for removal of mercury species from aqueous media. The prepared adsorbent was characterized by elemental analysis, scanning electron microscope , Fourier transform infrared spectroscopy , porous structure analysis and X-ray photoelectron spectroscopy, providing the evidence of successful fabrication. The adsorption conditions were found via varying pH, dosage, coexisting substances, contact time, temperature and concentration. Adsorption performance, described better by the pseudo-second-order kinetics with intraparticle diffusion as rate controlling step and Langmuir isotherm model, indicated a chemisorption process with the maximum Langmuir adsorption amount of 227.64 mg g −1 for mercury ions. Thermodynamically, adsorption of mercury ions was spontaneous and endothermic. Desorption and regeneration experiments demonstrated that it could be reused in five successive adsorption cycles without significant loss of its original performance. Experimental data and density functional theory calculation disclosed the coordination geometries and chelating mechanism between the adsorbent and mercury ions. The proposed study would provide a new prospect for the purification of mercury in aqueous system by functionalizing commercial polyacrylonitrile fiber with dendrimers.
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Journal of Materials Chemistry C
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2020
·Vol. 8
·期 42
·14723-14731
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IF 7.059
Lele Li,Liwei Yang,Si Zhang,Yuping Sun,Fen Li,Tengteng Qin,Xiaoqiang Liu,Yanmei Zhou,Subbiah Alwarappan
Herein, we designed a NiCo2S4@N/S–CeO2 composite with amplified electrocatalytic oxygen reduction (OR) capability by the in situ growth of NiCo2S4 nanoparticles on CeO2 nanospheres with simultaneous doping of nitrogen and sulfur. After optical characterization of the composite, it was then employed as the signal amplification label for constructing an electrochemical aptasensor. The composite provides a biocompatible and large surface platform to load biomolecules and retain their bioactivity. More importantly, the composite shows a comparable electrocatalytic OR capability similar to a commercial Pt/C catalyst and far better than CeO2, attributed to the NiCo2S4 deposition and oxygen vacancies introduced by N and S doping. Furthermore, the Koutecky–Levich plots indicate a nearly four-electron transfer pathway of the ORR. The as-prepared aptasensor exhibited a highly sensitive and selective determination of a model analyte-sulfadimethoxine with a wide linear range of 0.05–180 nM, a low detection limit of 0.02 ± 0.0011 nM and good feasibility for real-sample detection. This work paved an effective way for the design of highly efficient electrocatalysts with bright prospects in bioanalytical applications.
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RSC Advances
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2020
·Vol. 10
·期 41
·24425-24433
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IF 3.119
Shenjie Li,Tianyong Zha,Xiaoyu Gong,Qi Hu,Minghui Yu,Jinyu Wu,Ruolan Li,Jiaming Wang,Yanyan Chen
We present a facile route for the synthesis of water-soluble Cu–Cd–Zn–S/ZnS core/shell quantum dots (QDs) by simple pH regulation. The PL spectra of Cu–Cd–Zn–S/ZnS core/shell quantum dots can cover the whole visible light region in the case of only two ratios of Cu/Cd/Zn. The emission wavelength of Cu–Cd–Zn–S/ZnS QDs can be conveniently tuned from 474 to 515 and 548 to 629 nm by adjusting the pH value when the ratios of Cu/Cd/Zn are fixed at 1 : 5 : 80 and 1 : 5 : 10, respectively. It is worth noting that under the condition of a constant Cu/Cd/Zn ratio, the UV-vis absorption spectra do not change with the fluorescence spectra, indicating that the band gap of QDs remains unchanged during the change of pH value. The photoluminescence (PL) quantum yield of the as-prepared QDs with yellow emission is up to 76%. The QDs also show excellent chemical stability after the deposition of the ZnS shell. Luminescent and flexible films are fabricated by combining Cu–Cd–Zn–S QDs with polyvinyl alcohol (PVA). The QD/PVA flexible hybrid films are successfully applied on top of a conventional blue InGaN chip for remote-type warm-white LEDs. As-fabricated warm-white LEDs exhibit a higher color rendering index (CRI) of about 89.2 and a correlated color temperature (CCT) of 4308 K.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Sheng Zhao,Jing Xu,Min Mao,Lingjiao Li,Xuanhao Li
Based on hollow spherical NiCo 2 S 4 , Zn x Cd 1-x S with adjustable band structure was used to construct a composite for photocatalytic hydrogen evolution. The hollow spherical structure of NiCo 2 S 4 gives Zn x Cd 1-x S more contact positions to form a stable heterojunction. Through the band structure adjustment for Zn x Cd 1-x S, the induced electron transfer model was transformed into Z-scheme, which effectively enhances the photo-produced carrier separation efficiency of the composite material. At the same time, the fast electron transfer is realized by the great conductivity of the hollow spherical NiCo 2 S 4. This allows the composite material to obtain a shorter average lifetime of PL (0.15 ns) compared to Zn 0.5 Cd 0.5 S (3.9 ns). The composite NiCo 2 S 4 @Zn 0.5 Cd 0.5 S with Z-scheme heterojunction exhibited excellent photocatalytic HER activity and stability due to its unique spatial structure and efficient Z-scheme electron transfer path. The optimized composite NiCo 2 S 4 @Zn 0.5 Cd 0.5 S 1:1 photocatalytic HER rate reached 233.68 μmol . h −1 , which is equivalent to 5.81 times that of Zn 0.5 Cd 0.5 S (40.25 μmol . h −1 ).
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Colloid and Interface Science Communications
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2020
·
IF 2.831
Hongye Huang,Yi Cui,Meiying Liu,Ziyang He,Guang Yang,Fengjie Deng,Naigen Zhou,Xiaoyong Zhang,Yen Wei
In this work, we reported the preparation of nitrogen and FeS x codoped porous carbon through hydrothermal treatment of FeCl 3 , thiourea and porous carbon. The degradation results demonstrated that PC-FeS x composite displayed high degradation efficiency towards organic dyes with excellent reusability. Moreover, the degradation efficiency under alkaline solution (pH = 11) is even better under acidic solution (pH = 3), indicating that other routes for generation free radicals were existed. Electron spin resonance (ESR) spin−trap technique was used to determine the free radical species and results demonstrated that both •OH and O 2 − are formed during Fenton reaction . Considered the facile operation procedure, low cost of reagents and high degradation efficiency, we believe this work should of broad interest for fabrication of multifunctional composites for environmental treatment.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 29
·14506-14518
·
IF 11.301
Bai Xue,Shengdu Yang,Xin Sun,Lan Xie,Shuhao Qin,Qiang Zheng
The development of polymer-based thermal management materials (TMMs) is crucial to address the frequency reduction or overheating damage of modern electronics caused by inadequate thermal conductivity of substrates. However, high interfacial thermal resistance between filler and filler or between filler and matrix creates paramount bottlenecks for the prominent thermal conduction in polymer-based composites. Herein, novel tanghulu-like MoS2–SiC nanowire (L-MoS2–SiCNW) and cattail-like H-MoS2–SiCNW hybrids are successfully fabricated via a facile hydrothermal method, and then incorporated into a green cellulose nanofiber (CNF) matrix by a vacuum-assisted filtration approach. MoS2 nanosheets tightly rooted to the surface of SiCNWs can bridge the gap between SiCNWs and increase the contact area between them, which consequently leads to the large reduction of interfacial thermal resistance. As a result, the maximum in-plane TC of 19.76 W m−1 K−1 is attained for the flexible CNF/H-MoS2–SiCNW film at a relatively low filler content of 22.5 vol%, which has an enhancement of 1408% in contrast to that of the pure CNF film. In addition, the volume resistivity of the flexible CNF/H-MoS2–SiCNW film is two orders of magnitude higher than that of pure CNF, which is far above the required resistance for electrical insulation. In the real TMM application measurement of CNF/H-MoS2–SiCNWs, the temperature of the CPU core with the CNF/H-MoS2–SiCNW heat spreader is elevated more slowly than that of the bare case (e.g.: Δ = 4.9 °C at 980 s). Thus, this investigation provides a valuable insight into the design and fabrication of favorable polymer-based TMMs for potential applications in microelectronics and advanced energy.
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Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Xingyu Zhao,Minmin Chen,Hualin Wang,Li Xia,Min Guo,Suwei Jiang,Qian Wang,Xingjiang Li,Xuefei Yang
Synergistic antibacterial strategies have received growing attention due to their significantly enhanced antibacterial activity. Herein, we demonstrated a synergistic antibacterial strategy based on streptomycin sulfate (SS) loaded polyethylene glycol-MoS 2 /reduced graphene oxide (PEG-MoS 2 /rGO) nanoflakes assisted with near-infrared (NIR). The nanoflakes of PEG-MoS 2 /rGO were ultrasonically exfoliated well from the nanoflowers of PEG-MoS 2 /rGO fabricated by hydrothermal method, which was of antibacterial activity against Staphylococcus aureus and Escherichia coli after loading of SS. Under the irradiation of NIR, the antibacterial activity was significantly enhanced by the synergistic effects of physical damage, protein synthesis inhibition, thermal injury and oxidative stress. Moreover, the cytotoxicity of the nanoflakes was very low. The results suggest the great potential of PEG-MoS 2 /rGO-SS as a photothermal antibacterial agent.
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RSC Advances
·
2020
·Vol. 10
·期 39
·23410-23416
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IF 3.119
Yanyan Chen,Qi Hu,Qiang Wang,Minghui Yu,Xiaoyu Gong,Shenjie Li,Jin Xiao,Yingjie Guo,Guangyu Chen,Xinyu Lai
With the rapid development of commodity circulation, more attention has been paid to the anticounterfeiting technology of commodities, including stability, universality and ease of distinguishing. The authors report the use of gelatin–chitosan–glycerin/QD nanocomposite-functionalized glue for luminescent anti-counterfeiting labels. As the blend and plasticizer, the addition of chitosan and glycerin effectively improved the flexibility and formability of the gelatin–chitosan–glycerin/QD composite films, which show excellent mechanical properties, including high transparency, luminescence and flexibility, and they are easy to prepare on a large scale, providing certain reference values for new anticounterfeiting technology applying a variety of morphologies.
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