ANALYTICAL CHEMISTRY
·
2014
·
IF 5.825
Yong Wang,Yongnian Ni
Transition metal chalcogenides, especially molybdenum disulfide (MoS2), have recently attracted wide attention from researchers as graphene-analogous materials. However, until now, little literature has reported the synthesis of photoluminescent MoS2 materials and their applications in analytical chemistry. We herein presented a facile bottom-up hydrothermal route for the synthesis of photoluminescent MoS2 quantum dots (QDs) by using sodium molybdate and cysteine as precursors. The prepared MoS2 QDs were characterized by transmission electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, photoluminescence spectroscopy, and UV–vis spectroscopy. The MoS2 QDs were then used as photoluminescent probes to construct a photoluminescence (PL) quenching sensor for detection of 2,4,6-trinitrophenol (TNP). The TNP sensor presented a wide linear range from 0.099 to 36.5 μM with a high detection limit of 95 nM. Furthermore, the sensor displayed a high sensitivity toward TNP over other structurally similar compounds like 2,4,6-trinitrotoluene, p-chlorophenol, phenol, and 2,6-di-tert-butyl-4-methylphenol. To understand the origin of the high sensitivity, we assessed the emission wavelength-dependent PL quenching behavior of MoS2 QDs by the above five compounds using Stem–Volmer equation in detail. The results showed that the novel approach we put forward can satisfactorily explain the interaction mechanisms between MoS2 QDs and the five compounds, and the high sensitivity for TNP very likely originated from a combination of the PL resonance energy transfer, electronic energy transfer, and electrostatic interactions between MoS2 QDs and TNP. Finally, the sensor was successfully applied for detection of TNP in water samples and test papers.
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CHEMICAL ENGINEERING JOURNAL
·
2016
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IF 5.31
Xiaming Feng,Bibo Wang,Xin Wang,Panyue Wen,Wei Cai,Yuan Hu,Kim Meow Liew
A novel method of preparing the molybdenum disulfide (MoS 2 ) nanosheets coated by polypropylene (PP) latex enables the fabrication of PP/MoS 2 nanocomposites in scalable quantities. PP nanocomposites with various contents of MoS 2 nanosheets were prepared by simply melt-blending the coated MoS 2 and PP materials. The barrier effect of MoS 2 nanosheets in the thermal decomposition process of PP materials was investigated under different atmosphere by thermogravimetric analysis (TGA), microscale combustion colorimeter (MCC) and thermogravimetric analysis–infrared spectrometry (TG–IR). Importantly, the peak heat release rate (PHRR) of PP/MoS 2 nanocomposites with MoS 2 loadings of 1.6 wt% is decreased by 28.1% compared to that of neat PP. Moreover, the thermal oxidative stability of PP is dramatically reinforced with the incorporation of MoS 2 nanosheets. A 41.3 °C increase in the temperature of the onset of degradation ( T −10% ) and a 40.1 °C increase in the temperature of maximum weight loss ( T max ) were observed by inclusion of as low as 1.6 wt% MoS 2 nanosheets. The excellent barrier performance together with the favorable compatibility of MoS 2 nanosheets is regarded as the key point for the reinforcement of thermal oxidative stability and reduction of flammable pyrolysis gas, which can provide promising applications in the development of fire safety polymer materials.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Ruijing Wang,Peng Sun,Huanwen Wang,Xuefeng Wang
At high current density during the hydrogen evolution reaction (HER) process, the active layer for most of MoS 2 -based electrocatalysts suffers from pulverizations and easily drops-off due to a high rate of bubble formation and strong stirring. Herein, a facile pulsed laser deposition (PLD) method is used to fabricate amorphous molybdenum disulfide (MoS 2 ) films on gold-coated carbon cloth (Au/CC) for HER test. Because of the strong anchoring interaction between MoS 2 catalysts and the Au/CC substrate during the underlying laser ablation process, remarkable stability with 5000 continuous HER cycles has been achieved in the acid media. Furthermore, the as-obtained MoS 2 catalyst shows a small Tafel slope of 48 mV decade −1 , an onset overpotential of 132 mV and the overpotential of 180 mV at a current density of 10 mA cm −2 . These results demonstrate that PLD is a very promising technique for making the film electrodes for application in electrocatalytic process.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Linlong Zhang,Kayi Shao,Yaping Zhong,Lijuan Guo,Junping Ge,Zhentan Lu,Dong Wang
A method for the specific detection of glutathione (GSH) and ascorbic acid (AA) using 3-aminophenylboronic acid functionalized molybdenum disulfide quantum dots (APBA-MoS 2 QDs) was reported. The APBA-MoS 2 QDs synthesized using the hydrothermal method showed the strongest fluorescence intensity at an emission wavelength of 375 nm with the optimum excitation wavelength of 320 nm. The detection method was constructed by the combination of the dynamic and static quenching and the inner filter effect (IFE) of APBA-MoS 2 QDs by permanganate (MnO 4 − ) and the rapid redox reaction (1 min) of MnO 4 − by GSH or AA. The concentrations of GSH and AA showed good linear ranges of 10–500 μM and 10–100 μM, respectively, with limits of detection (LOD) of 0.476 μM and 0.185 μM, respectively. The spiked recovery tests in human serum and fresh fruit samples showed that APBA-MoS 2 QDs had significant potential in the construction of fluorescent biological detection methods.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Jianping Yang,Runze Yang,Jiale Sun,Guanglan Peng,Mengjie Li,Wanzhen Li,Longbao Zhu,Weiwei Zhang,Fei Ge,Jun Wang,Ping Song
To address the growing threat of drug-resistant bacteria and their biofilm-associated infections, we developed molybdenum disulfide (MoS2) nanoparticles coated with antimicrobial peptides (AMPs). The MoS2/AMP composite nanoparticles, synthesized through electrostatic phase interaction, maintained an impressive photothermal-conversion efficiency of 32.3%. The minimum inhibitory concentrations of the MoS2/AMP nanoparticles against multidrug-resistant Escherichia coli and Staphylococcus aureus were approximately 78 and 64 μg/mL, respectively, under 808 nm near-infrared light irradiation for 5 min. Furthermore, around 90% of the biofilm was effectively ablated with 128 μg/mL of the composite nanoparticles under the same irradiation conditions. These composite nanoparticles demonstrated remarkable antibacterial and biofilm-eradication capabilities by harnessing the united effects of photothermal action and AMPs. Hemolysis and cytotoxicity assays showed that AMP-coated MoS2 significantly diminished the hemolytic activity and cytotoxicity associated with AMP. This work suggests a potentially effective strategy for facilitating the commercial application of AMPs, and the composite nanoparticles MoS2/AMP hold considerable promise for antibacterial treatment of chronic infected wounds, biofilm elimination, and the mitigation of antibiotic resistance.
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Nano Research
·
2019
·Vol. 12
·期 4
·823-827
·
IF 8.515
Yang Peng,Yang Ai-Guo,Chen Lingxiu,Chen Jing,Zhang Youwei,Wang Haomin,Hu Laigui,Zhang Rong-Jun,Liu Ran,Qu Xin-Ping,Qiu Zhi-Jun,Cong Chunxiao
Chemical vapor deposition (CVD) is the most efficient method to grow large-area two dimensional (2D) transition metal dichiacogenides (TMDCs) in high quality. Monolayer molybdenum disulfide (MoS 2 ) and seed-assistant are the mostly selected 2D TMDC and growth strategy for such CVD processes, respectively. Though the advantages of seed catalysts in facilitating the nucleation, achieving higher yield and better repeatability, as well as their effects on the morphologies of as-grown MoS 2 have been studied, the influence of seeding promoters on both optical and electrical properties of as-grown monolayer MoS 2 is not known comprehensively, which is indeed critical for understanding fundamental physics and developing practical application of such emerging 2D semiconductors. In this report, we systematically investigated the effect of different seeding promoters on the properties of CVD-grown monolayer MoS 2 . It is found that different seed molecules lead to different impacts on the optical and electrical properties of as-grown monolayer MoS 2 . Among three different seed catalysts (perylene-3,4,9,10-tetracarboxylic acid tetrapotassium salt (PTAS), copper phthalocyanine (CuPc), and crystal violet (CV)), PTAS performs better in obtaining large area monolayer MoS 2 with good optical quality and high electrical mobility than the other two. Our work gives a guide for modifying the properties of as-grown monolayer MoS 2 and other 2D transition metal dichalcogenides in seeding promoters-assisted synthesis process.
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ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Pengcheng Jing,Siobhan Stevenson,Huimin Lu,Peng Ren,Isaac Abrahams,Duncan H. Gregory
If magnesium-ion batteries (MIBs) are to be seriously considered for next-generation energy storage, then a number of major obstacles need to be overcome. The lack of reversible cathode materials with sufficient capacity and cycle life is one of these challenges. Here, we report a new MIB cathode constructed of vertically stacked vanadium molybdenum sulfide (VMS) nanosheets toward addressing this challenge. The integration of vanadium within molybdenum sulfide nanostructures acts so as to improve the total conductivity, enhancing charge transfer, and to produce abundant lattice defects, improving both the accommodation and transport of Mg2+. Additionally, electrolyte additive-induced interlayer expansion provides a means to admit Mg2+ cations into the electrode structure and thus enhance their diffusion. The VMS nanosheets are capable of exhibiting capacities of 211.3 and 128.2 mA h g–1 at current densities of 100 and 1000 mA g–1, respectively. The VMS nanosheets also demonstrate long-term cycling stability, retaining 82.7% of the maximum capacity after 500 cycles at a current density of 1000 mA h g–1. These results suggest that VMS nanosheets could be promising candidates for high-performance cathodes in MIBs.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2019
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IF 6.019
Zhenzhen Guo,Zihe Chen,Zhuoxun Shi,Jingwen Qian,Jinhua Li,Tao Mei,Jianying Wang,Xianbao Wang,Ping Shen
Solar vapor generation provides an ideal pathway for water remediation by using abundant natural resource--solar irradiation. Great progresses have been made in increasing solar steam efficiency by macrostructure design and microscopic morphology regulation. Here, we report a stable 1T phase engineering of molybdenum disulfide (MoS 2 ) for enhanced solar vapor generation. A flower-like 1T/2H MoS 2 (1T/2H FMoS 2 ) was developed by a simple one-step hydrothermal method . The 1T/2H FMoS 2 showed enhanced broadband sunlight absorption covering solar spectrum from 300 to 2500 nm. A high evaporation rate of 1.52 kg m −2 h −1 and 20% increase of the photo-to-heat conversion efficiency compared to that of only 2H MoS 2 were achieved for 1T/2H FMoS 2 by introducing 1T phase and a hierarchical flower-like structure. More importantly, the 1T/2H FMoS 2 possessed benign phase stability with a high phase conversion temperature 253 °C. As a photothermal material, it provides an ideal solar-receiver for high efficient solar clean water generation, to alleviate drinking water crisis and energy risk.
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Energy Technology
·
2021
·Vol. 10
·期 3
·2100915
·
IF 3.631
Linan Xu,Ce Liang,Jiawen Lin,Haitao Li,Yingli Li,Song Lin,Shuangwen Li,Lili Feng,Qi An
Solar-thermally driven functional systems have drawn extensive interest due to the environmentally benign use of sunlight. However, such function devices still suffer from the problems of preparation method, cost, and performance, therefore hindering their preparation and application. Herein, an easily prepared promising solar-thermally powered functional system with high performance for effective sunlight-driven hydrogen production was constructed. Such a functional system consists of a photothermal generator with a high-performance solar absorber, together with a water-splitting catalytic module using molybdenum disulfide loaded on carbon cloth (MoS 2 -CC) as a cathode. The optimal gold composite polyethyleneimine-modified graphene oxide (Au@rGO-PEI) solar absorber coated on a commercial thermoelectricity device exhibits enhanced (45.9% higher) photothermal performance compared with rGO-PEI; this is due to the introduction of Au nanosheets' effective plasma resonance. This as-designed generator enables stable and long-term output power under different ambient temperatures and sunlight. The stable hydrogen production can be achieved by combining thermoelectric units (2 in series) and electrocatalytic modules. It is envisaged that the design will promote the further development of photothermal functional devices toward use in commercial applications, help overcome problems associated with the energy crisis, and provide a practical reference for the design of solar-driven functional devices.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2026
·
IF 8.7
Shixiang Rao,Hao Jiang,Shirong Du,Zheng Li,Guoqing Wang
Marine biofouling poses a serious safety threat and significant economic losses to offshore infrastructure. Although hydrogels have made considerable progress in marine antifouling, developing antifouling hydrogels that combine high strength and efficiency remains a challenge. In this study, a highly tough three-dimensional network composite hydrogel was designed by introducing cellulose nanofibers (CNF)-functionalized molybdenum disulfide (MoS 2 ) nanosheets (MoS 2 @CNF). Herein, cellulose nanofibers are employed as a green and effective exfoliation assistant to fabricate well-dispersed MoS₂@CNF nanosheets, which exhibit a sterilization rate of up to 99.9% under near-infrared (NIR) irradiation. The as-synthesized hydrogel exhibits a tensile strength of 6.42 MPa and a toughness of 20.16 MJ/m 3 , significantly exceeding the strength of previously reported antifouling hydrogels, while also demonstrating low swelling rates and seawater stability. Furthermore, the as-prepared hydrogel demonstrated outstanding anti-protein adhesion rates (>99.9%) and excellent anti-algae adhesion rates (>99.9%), with fouling coverage of only 0.10% during a 90-day real sea trial, showcasing its strong antifouling efficacy. This work provides a new strategy for developing green marine anti-fouling hydrogels that combine great mechanical strength with durable antifouling functionality.
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VIBRATIONAL SPECTROSCOPY
·
2026
·
IF 3.1
Xuejiao Wang,Xueyan Liu,Wei Zhang,Bing Hua,Haoyu Zhang,Erjin Zhang
Research on non-noble metal SERS platforms has drawn widespread focus in the past decade. Molybdenum disulfide (MoS 2 ) has emerged as a highly potential candidate for non-noble metal SERS platforms, owing to its tunable bandgap and abundant active sites. Nevertheless, pristine MoS 2 exhibits weak SERS activity, limiting its practical applications. In this study, tungsten atoms were doped into MoS 2 by a one-step hydrothermal approach to significantly boost MoS 2 ’s capability for SERS applications. The following factors account for the enhanced SERS activity of tungsten-doped MoS 2 (W-MoS 2 ): W doping can enhance the adsorption between MoS 2 and analyte molecules, and facilitate charge transfer between them. Additionally, W doping is capable of regulating the band structure of MoS 2 , thereby enhancing the charge transfer efficiency. Experimental results show that the W-MoS 2 SERS substrate has better detection performance compared with the pure MoS 2 SERS substrate. For methylene blue (MB), the SERS enhancement factor (EF) of the W-MoS 2 substrate was calculated as 1.095 × 10 6 , and its detection limit was achieved at 10 −7 M. Additionally, the W-MoS 2 platform demonstrates high homogeneity and stability. This work offers a novel perspective on the rational synthesis of transition-metal dichalcogenide materials exhibiting high SERS performance.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Yaping Zhong,Lijuan Guo,Yibiao Zou,Yu Chen,Zhentan Lu,Dong Wang
We proposed a rapid and ratiometric fluorescent detection method for hypochlorite by glutathione functionalized molybdenum disulfide quantum dots (G-MoS 2 QDs). The G-MoS 2 QDs were obtained through a hydrothermal method and the maximum fluorescence intensity was obtained at 430 nm under excitation of 360 nm. The fluorescence of G-MoS 2 QDs at 430 nm can be weakened by curcumin through the inner filter effect, meanwhile the fluorescence of curcumin at 540 nm appeared. Hypochlorite can fast oxidize curcumin and weaken the inner filter effect, thus the fluorescence of curcumin at 540 nm decreased and the fluorescence of G-MoS 2 QDs at 430 nm increased. This process takes only 30 s at room temperature. This is the rationale behind our rapid ratiometric fluorescent detection model for hypochlorite. Two linear detection ranges for hypochlorite are obtained with concentration from 1 to 20 μM and 20 to 30 μM, the limit of detection (LOD) was 11.5 nM. The standard spike recovery tests on milk and tap water samples showed satisfactory results, which extended the application of G-MoS 2 QDs in the field of ratiometric fluorescence detection assays.
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