JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Chong-Bo Ma,Yan Du,Baoji Du,Hao Wang,Erkang Wang
An adsorbent that exhibits high affinity for inorganic mercury (Hg 2+ ) with a high removal efficiency of methylmercury (MeHg + ) has been developed. The adsorbent demonstrates a symbiotic relationship between its two components, molybdenum disulphide nanoflowers (MoS 2 NFs) and a poly (vinyl alcohol) (PVA) aerogel. Furthermore, we modified the distribution and loading of the MoS 2 NFs, which was possible due to the stable porous support, and investigated the biocompatibility of the aerogel-support adsorbent. The performance of the optimized material exhibited a distribution coefficient of 9.71 × 10 7 mL g −1 . In addition, the adsorbent was effective over a wide pH range and could efficiently purify both contaminated lake and sea water. The key motivation for using an aerogel support was to stabilise the MoS 2 NFs during purification of the water (resulting in improved performance compared to using freestanding MoS 2 NFs) and the ability to regenerate the used adsorbent. In addition, animal tests confirmed an extremely low toxicity of the adsorbent to fish, along with the excellent purification results.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Peipei Qi,Jiao Wang,Xue Wang,Xiangyun Wang,Zhiwei Wang,Hao Xu,Shanshan Di,Qiang Wang,Xinquan Wang
An efficient, highly sensitive and selective electrochemical sensor was developed for determination of fenitrothion in tap water, cropland water and canal water samples. The synthesized reduced graphene oxide (RGO) and molybdenum sulfide (MoS 2 )-Au were introduced using their synergetic enhancement effect to improve the sensor sensitivity. Zirconia (ZrO 2 ) nanoparticles were electro-deposited onto modified gold electrode to selectively adsorb fenitrothion, which can be further captured by cyclic voltammetry or square wave voltammetry on the basis of its redox behavior of nitrobenzene group. The immobilization process was characterized by electrochemical impedance spectroscopy , illustrating the enhancement of RGO/MoS 2 -Au composite and the successful electro-deposition of ZrO 2 . Systematical method validation was performed including linearity, sensitivity, selectivity, reproducibility, regeneration and stability. The current is linearly correlated with the fenitrothion concentration from 5.0 to 600 ng mL −1 with the limit of detection of 2.2 ng mL −1 . The developed electrochemical sensor displayed satisfactory performance in real water samples analysis.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 4
·1-8
·
IF 5.705
Yu Xinsheng,Hu Lianzhe,Zhang Feng,Wang Min,Xia Zhining,Wei Weili
A dual-channel ratiometric nanoprobe is described for detection and imaging of microRNA. It was prepared from MoS 2 quantum dots (QDs; with blue emission and excitation/emission peaks at 310/398 nm) which acts as both the gene carrier and as a donor in fluorescence resonance energy transfer (FRET). Molecular beacons containing loops for molecular recognition of microRNA and labeled with carboxyfluorescein (FAM) were covalently attached to the MoS 2 QDs and serve as the FRET acceptor. In the absence of microRNA, the nanoprobe exhibits low FRET efficiency due to the close distance between the FAM tag and the QDs. Hybridization with microRNA enlarges the distance between QD and beacon. This results in an enhancement of the FRET efficiency of the nanoprobe. The ratio of green and blue fluorescence (I 520 /I 398 ) increases linearly in the 5 to 150 nM microRNA concentration range in both aqueous solution and diluted artificial cerebrospinal fluid. The limit of detection (LOD) is as low as 0.38 nM and 0.52 nM, respectively. Other features of this nanoprobe include (a) excellent resistance to nuclease-induced false positive signals and (b) the option to use it for distinguishing different cell lines by in-situ imaging of intracellular microRNAs.
Schematic of a dual-channel photoluminescence nanoprobe for the determination of microRNA-21 (miR-21) by monitoring the microRNA-triggered enhancement of the fluorescence resonance energy transfer (FRET) efficiency between MoS 2 QDs and carboxyfluorescein-labeled molecular beacons.
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MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 9
·2517-2523
·
IF 4.831
Li Ying,Lin Hechun,Peng Hui,Qi Ruijuan,Luo Chunhua
We describe a chemical exfoliation method for the preparation of MoS 2 nanosheets. The nanosheets were incorporated into poly(3,4-ethylenedioxythiophene) (PEDOT) by electrodeposition on a glassy carbon electrode (GCE) to form a nanocomposite. The modified GCE is shown to enable simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA). Due to the synergistic effect of MoS 2 and PEDOT, this electrode displays better properties in terms of electrocatalytic oxidation of AA, DA and UA than pure PEDOT, which is illustrated by cyclic voltammetry and differential pulse voltammetry (DPV). Under optimum conditions and at pH 7.4, the respective sensitivities and best working potentials are as follows: AA: 1.20 A∙mM −1 ∙m −2 , 30 mV; DA: 36.40 A∙mM −1 ∙m −2 , 210 mV; UA: 105.17 A∙mM −1 ∙m −2 , 350 mV. The calculated detection limits for AA, DA and UA are 5.83 μM, 0.52 μM and 0.95 μM, respectively. The modified electrode was applied to the detection of the three species in human urine samples and gave satisfactory results.
MoS 2 nanosheets were prepared by a facile chemical exfoliation method. MoS 2 and poly(3,4-ethylenedioxythiophene) nanocomposite modified glassy carbon electrodes were fabricated, which are shown to enable simultaneous determination of ascorbic acid, dopamine and uric acid with high sensitivity and selectivity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
·
IF 4.233
Wenwen Liu,Bo Liang,Yongjin Ma,Yi Liu,Anquan Zhu,Pengfei Tan,Xiang Xiong,Jun Pan
The construction of a plasmonic photocatalyst is an efficient way to suppress detrimental electrons-holes recombination and extend the spectral range of light absorption in semiconductors. However, the facilitation effect in the aspect of electrons-holes separation is great limited as the lack of a driving force compelled the electrons or holes migration to surface catalytic sites makes them flow randomly in semiconductors. In this work, we confirm that the integration of MoS 2 nanosheets formed two dimensional (2D) layered heterojunction with C 3 N 4 with Au-C 3 N 4 plasmonic photocatalyst can further enhance electrons-holes separation through the formation of Au-C 3 N 4 -MoS 2 nanostructure by a facile ultrasonic chemical method . The integrated MoS 2 nanosheets extract the electrons not only from C 3 N 4 due to a building up of 2D layered heterojunction but also from plasmonic Au via a “pipe” played by C 3 N 4 . The electrons “pump” role of the 2D MoS 2 nanosheets makes electrons flow randomly turn into the well-organized migration direction, promoting the electrons-holes more efficient separation and lifetime prolongation. Meanwhile, MoS 2 nanosheets also increase the light absorption of the photocatalyst owing to its inherent strength of the narrower band gap. Enabled by integration of 2D MoS 2 nanosheets, the hydrogen production rate is 2.08 times higher than that of its counterpart Au-C 3 N 4. This work highlights a new window to employ 2D layered heterojunction for enhanced photocatalytic hydrogen evolution performance.
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Analytical Methods
·
2017
·Vol. 10
·期 1
·51-58
·
IF 1.9
Xiao-Li Du,Tian-Fang Kang,Li-Ping Lu,Shui-Yuan Cheng
A novel electrochemiluminescence (ECL) biosensor based on CdSe@CdS quantum dots (QDs) functionalized MoS2 modified electrode was developed for sensitive detection of Pb(II) using HRP-mimicking DNAzyme biocatalytic precipitation (BCP) for ECL signal quenching. Polycationic poly(diallyldimethylammonium chloride) (PDDA) and negatively charged QDs were adsorbed on the surface of MoS2, in sequence, to form the MoS2–QDs composites, which were employed as a matrix for the immobilization of the G-rich DNA strand, i.e., T30695. The MoS2–QDs were characterized by UV-vis absorption spectroscopy, fluorescence spectroscopy, energy dispersive spectrometry, transmission electron microscopy, and field emission scanning electron microscopy. CdSe@CdS QDs can produce an ECL signal using 0.1 M K2S2O8 as a co-reactant. T30695 can combine with Pb(II) ions to form a stable parallel G-quadruplex. The G-quadruplex can further combine with hemin to form DNAzyme, which can catalyze H2O2 and oxidize 4-chloro-1-naphthol (4-CN) to produce an insoluble precipitation of benzo-4-chlorohexadienone on the surface of the sensor. When the concentration of Pb(II) in the solution was increased, more of DNAzyme was generated and subsequently more 4-CN molecules were oxidized catalytically, leading to a decrease of the ECL signal. Using this quenching strategy, the ECL signal of the biosensor was linearly dependent on the logarithm of the Pb(II) concentration ranging from 1.0 × 10−15 to 1.0 × 10−11 M with a detection limit of 0.98 f M. The stability and selectivity of the sensor were also investigated. The sensor was applied in the determination of Pb(II) in the real water samples and satisfactory results were obtained.
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Molecular Catalysis
·
2017
·
IF 0
Zepeng Qu,Yang Rong,Liang Tang,Xiaoqing Shu,Xudong Liu,Zhaohong Zhang,Jun Wang
A new visible-light-induced Z-scheme photocatalytic system, Er 3+ :Y 3 Al 5 O 12 /(MoS 2 /NiGa 2 O 4 )-(BiVO 4 /PdS), is designed and prepared by using hydrothermal and mixed-calcination methods And the prepared samples are characterized by X-ray diffractometer (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) and UV–vis absorption spectra. The photocatalytic activity is evaluated towards Orange G degradation with simultaneous hydrogen evolution under visible-light irradiation. The photocatalytic experiments indicate that the Er 3+ :Y 3 Al 5 O 12 /(MoS 2 /NiGa 2 O 4 )-(BiVO 4 /PdS) as photocatalyst displays very high photocatalytic activity. It can be ascribed to two sides. One is the use of Er 3+ :Y 3 Al 5 O 12 offering ultraviolet-light to activate the wide-band gap NiGa 2 O 4 . Another is the construction of Z-scheme system between NiGa 2 O 4 and BiVO 4 which can result in a more efficient separation of photoexicited charge carriers, thus endowing it with much powerful oxidation and reduction capabilities. Moreover, the reusability study shows that the prepared photocatalyst can be effectively recycled for three repetitive cycles without an apparent deactivation. In addition, the possible Z-scheme mechanism of Er 3+ :Y 3 Al 5 O 12 /(MoS 2 /NiGa 2 O 4 )-(BiVO 4 /PdS) is also proposed, and further evidenced by photoluminescence (PL) spectra. The present work not only designs a new photocatalytic system but also well applies in photocatalytic degradation of refractory pollutant with simultaneous hydrogen evolution.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yaping Xing,Ting Wang,Xiaotian Wang,Zhiguo Liu,Zhengfeng Jia,Chuanyu Jin,Jinming Zhen,Ran Zhang
Although two-dimensional MoS 2 exhibits superior properties compared to the bulk, the significant agglomeration and poor conductivity limit the application in energy storage and conversion. In this paper, two-dimensional MoS₂ powders, synthesized using a straightforward ultrasonic method, are employed as the raw material and subsequently self-assembled into three-dimensional MoS₂ through the cross-linking action of dopamine (DA). Utilizing the reduction properties of DA, nano-silver (Ag) is successfully anchored within the layered structure of MoS 2 , which not only enhance conductivity of MoS 2 , but also improve structural stability. Finally, the mixed samples are carbonized to prepare a highly stable and conductive three-dimensional MoS 2 /Ag@C cathode material. In thermal batteries, MoS 2 /Ag@C cathode has a large specific energy of 404.74 Wh kg −1 at 50 mA cm −2 with a cut-off voltage of 1.35 V, which is higher than 26.70 Wh kg −1 of bulk MoS 2 and 107.76 Wh kg −1 of two-dimensional MoS 2 cathodes, respectively. Subsequent studies demonstrate that Ag and pyrolytic carbon enhance the structural stability of the electrode under high-temperature discharge conditions, but also inhibit the interfacial dissolution reaction between MoS 2 and molten salt, ultimately improving the discharge performances.
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PHYSICA SCRIPTA
·
2024
·
IF 2.6
Siyi Xu,Danyi Li,Wenrui Wang,Lin Lin,Ying Sun,Jihao吉豪 Li李,Linfan Li
In recent years, there has been significant interest in using two-dimensional MoS2 to enhance flame retardancy, which has proven challenging. MoS2@Fe3O4 nanosheets were successfully synthesized via a one-step method called radiation reduction to boost MoS2's flame retardant properties. Incorporating these MoS2@Fe3O4 nanocomposites notably improved the flame retardancy of ethylene vinyl acetate copolymer (EVA). Compared to pure EVA, EVA nanocomposites with 1 part of MoS2@Fe3O4 showed a 17.4% reduction in peak heat release rate, 40.4% decrease in total heat release, and 52.9% reduction in total smoke release, with scaly residue content improving from 0.4% to 12.6%. Additionally, MoS2@Fe3O4 incorporation enhanced the mechanical and friction properties of EVA composites, increasing tensile strength by 25.7% and elongation at break by 10.4% compared to pure EVA. This study presents an effective and simple method for producing modified MoS2 nanosheets that enhance flame retardancy, as well as mechanical and friction properties of EVA composites.
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Nanoscale
·
2024
·
IF 5.8
Zhen-Hua Han,Qi-Bo Wang,Qin-Qin Xu,Xin-Hui Qiu,Tong Cheng,Dong-Sheng Jiao,Jian-Zhong Yin
Sulfuration reactions dominate the synthesis of transition-metal dichalcogenides via chemical vapor deposition. A neglected critical issue is the evolution of crystal domain morphology and growth models caused by boundary layer development. In this study, we propose two growth models within a laminar flow field to investigate the kinetic mechanism of uniformly grown MoS2. We used supercritical fluid pre-deposition to obtain a well-distributed and low-crystallinity Mo precursor on the surface of a substrate to avoid non-stoichiometric supply in sulfuration. The development of the boundary layer was suppressed through mainstream force by adjusting the substrate slope angle. For growth within the underdeveloped laminar boundary layer, monolayer MoS2 with a size of 50 μm uniformly distributed on the full substrate with R = 85% (relative change in boundary layer thickness). Moreover, the growth constrained by surface chemical reactions tended to promote spatially uniform growth. However, within the fully developed laminar flow, the crystal domains preferentially grew vertically, which was attributed to the excessive crystal growth rate (g). Our results provide new insights into the controllable preparation of two-dimensional materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wen Wang,Chuyuan Lin,Fenqiang Luo,Renpin Liu,Xiaochuan Chen,Wangyang Wu,Shiting Wei,Fuyu Xiao,Peixun Xiong,Qinghua Chen,Qingrong Qian,Lingxing Zeng
Hybrid magnesium-lithium batteries (MLIBs) are a promising battery system with safety and exceptional reaction kinetics due to the combination of the dendritic-free deposition Mg metal anode and the rapid Li intercalation cathode. The large interchain frame of VO 2 may contribute to the metal-ion diffusion, making it a suitable cathode for MLIBs. However, the development of VO 2 cathodes for MLIBs is restricted by bad structural stability and low electronic conductivity. Herein, MoS 2 with a hexagonal crystal structure is introduced into the tetragonal VO 2 to construct heterostructure interfaces and induce abundant oxygen vacancies (VO 2 /MoS 2 -2), which enhances the structural stability and reaction kinetics. For this reason, the VO 2 /MoS 2 -2 cathode delivers a remarkable capacity (518 mAh g -1 ) and a considerable cycling lifespan (202 mAh g -1 at 1.0 A g -1 over 700 cycles). Even at low temperatures (-15 and -40 °C), VO 2 /MoS 2 -2 delivers 145 and 115 mAh g -1 after 200 and 50 cycles at 0.1 A g -1 , respectively. This strategy of combinatorial design offers a widely applicable method for the cryogenic resistance and cycling durability of magnesium-lithium batteries.
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Advanced Fiber Materials
·
2025
·
IF 21.3
Zhou Mi,Huang Lele,Wan Yuhang,Jiang Qing,Qu Xueru,Mia Md Hasib,Xu Jie,Gao Chao,Hou Lin,Yu Zhicai,He Hualing
Firefighting clothing provides essential safeguards for firefighters while engaging in fire suppression and life rescue operations. However, the inability to actively detect hazardous gas and self-thermal degradation of conventional firefighting clothing induce critical safety threats to firefighters. Herein, we design a dual-mode perceptual sensor via programmable assembly of single-walled carbon nanotubes (SWCNTs) and Ti 3 C 2 T x MXene@MoS 2 nanocomposite in dual-mode triaxial structural aerogel fiber (DM-TSF) for both selective NH 3 and temperature monitoring. The DM-TSF is prepared through triaxial wet spinning, with an alternating p / n -type thermoelectric (TE) core, a signal decoupling aramid nanofibers layer, and an NH 3 sensing outer sheath. The TE core is composed of alternately interconnected p -type/SWCNT and n -type SWCNT/Polyethyleneimine, which exhibits high TE efficiency (8.44 μV K −1 for p -segment, 7.44 μV K −1 for n -segment) and wide-range (10–500 °C) temperature monitoring in DM-TSF. Furthermore, the abundant adsorption sites and high-density Schottky heterojunctions of the Ti 3 C 2 T x MXene@MoS 2 nanocomposite in the outer sheath enabled DM-TSF to exhibit an outstanding sensitivity (3.14% ppm −1 @20 ppm) and high selectivity for NH 3 . A portable wireless system based on DM-TSF was further developed and integrated into firefighting clothing for temperature and NH 3 monitoring, triggering alarms within 2 s and 28 s, respectively. This work sheds new light on the fabrication of intelligent multiplex hazard detection fibers that can respond to multi-hazard elements, thereby enhancing firefighters’ safety in complex fire scenarios. Graphical
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