ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Lian Ma,Qiaran Zhang,Chao Wu,Yue Zhang,Lintao Zeng
Composite nanomaterials are particularly useful and offer many excellent opportunities for electrochemical sensing application. Depending on the high catalytic activity of bimetallic nanoparticles , the large specific surface area, abundant active edges and co-catalytic function of MoS 2 nanosheets , we, for the first time, prepared a novel PtNi bimetallic nanoparticles loaded MoS 2 nanosheets (PtNi@MoS 2 ) hybrid material by a co-reduction method for the electrochemical sensing application. The nanocomposite is characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS), and then casted on a bare glassy carbon electrode (GCE) to fabricate an electrochemical sensor (PtNi@MoS 2 /GCE). The electrochemical investigation showed that the sensor performed good selectivity and wide linear ranges for the simultaneous detection of dopamine (0.5–150 μM) and uric acid (0.5–600 μM). And the detection limits were down to 0.1 μM (S/N = 3) for both analytes.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2021
·Vol. 9
·期 9
·2266-2274
·
IF 6.331
Wen Jing Yang,Xiaodong Wang,Rui Zhang,Yuxin Wang,Qiu Qiu,Lihui Yuwen,Lianhui Wang
A hybrid self-healing hydrogel (PM hydrogel), based on polyvinyl alcohol (PVA) and chemically exfoliated molybdenum disulfide (ce-MoS2) nanosheets, was prepared by a simple freeze–thaw method. Due to the excellent photothermal conversion properties of ce-MoS2 nanosheets, the PM hydrogel self-repaired rapidly under near infrared (NIR) light irradiation for only 3 min with a high healing efficiency of 91.8 ± 3.3%. The PVA content, ce-MoS2 nanosheet loading and light irradiation time played important roles in the self-healing performance. Additionally, the PM hydrogel also revealed good self-healing properties with a healing efficiency of 60.6 ± 3.6% after the cut surfaces were separated for 24 h. The present approach provides an effective strategy for fabricating fast light-triggered hydrogen-bond based self-healing systems. The as-prepared hybrid PM hydrogel has great potential as a soft biomaterial for long-term applications due to its biocompatibility and self-healing capability.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Dengyu Xie,Guang Yang,Deshuang Yu,Yanan Hao,Silin Han,Yafei Cheng,Feng Hu,Linlin Li,Huaixin Wei,Changchun Ji,Shengjie Peng
Herein, a heterogeneous system composed of few-layered MoS2 nanosheets functionalized multichannel hollow carbon nanofibers containing Mo2N (Mo2N–MoS2 MCNFs) was successfully developed for the hydrogen/oxygen evolution reactions (HER/OER). The obtained Mo2N–MoS2 MCNFs manifests superior performance with improved durableness for electrocatalysis. Independently, at 10 mA cm–2, the optimal Mo2N–MoS2(1:1) MCNFs achieves overpotentials (η10) of 131 mV for HER and 270 mV for OER. The intimate interaction between the few-layered MoS2 nanosheets array and 1D multichannel hollow carbon nanofibers Mo2N (Mo2N/Carbon MCNFs) advances better exposure of dynamic heterointerfaces, improves the conductivity of electron transfer, and enriches active sites with efficient mass transport. When employed to drive the water electrolysis, Mo2N–MoS2(1:1) MCNFs also demonstrates a modest overall potential of merely 1.63 V to hit 10 mA cm–2. This study will provide a well-designed structure and development for functional materials in electrochemical energy storage and conversion devices.
研究领域:
材料科学
·
电化学
·
能源转换与存储
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2020
·
IF 1.566
Dan Zhou,Jianzhong Yin
A surfactant system L64 and alcohol mixture was employed to exfoliate MoS 2 . To reduce the impact of surfactant on the quality of the nanosheet, the concentration of L64 was decreased to an extremely low value 0.0325 mM. Utilize common ultrasonic bath, the production yield of the nanosheet was increased to about 5% per hour, and statistical results from AFM showed that 40% of the nanosheet were less than 4 nm thick. Rheology characterization showed that surfactant alcohol mixtures were shear thinning fluid, yet the viscosity of L64 system varies directly with the shear rate in the high-speed shear region (higher than 400 s −1 ), and further affect the shear strength, therefore viscosity at high-speed shear can be considered as an indicator of the effectiveness for the exfoliation system. Exfoliated MoS 2 was evaluated by hydrogen evolution reaction, and compared to the bulk MoS 2 , the 4 wt% Pt/FL-MoS 2 improved the overpotential from 366 mV to 273 mV at 10 mA • cm − 2 . This study presented a facile and effective route to fabricate 2D MoS 2 with much less residue, and bring more opportunities to exploit clean and nontoxic system to exfoliate 2D materials.
研究领域:
材料科学
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化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 27
·16490-16499
·
IF 3.361
Li Lei,Zhuo Peng,Ting Liang,Hai-Rong Yu,Chang-Jing Cheng
Herein we report solvothermal synthesis of poly(acrylic acid) (PAA) decorated magnetic molybdenum disulfide nanosheets (MMoS2/PAA) for highly efficient adsorption of three cationic dyes of basic fuchsin (BF), methylene blue (MB), and crystal violet (CV) from aqueous solutions. The synthesized MMoS2/PAA was characterized by several techniques including transmission electron microscopy (TEM), Fourier transform-infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), vibrating sample magnetometry (VSM), and dynamic light scattering (DLS). Due to the strong electrostatic interaction between cationic dyes and the anionic nanosheet surface, the obtained MMoS2/PAA showed ultrafast adsorption of BF, MB and CV within 2 min with high adsorption capacities of 886.1, 709.0, and 633.6 mg g−1, respectively, much higher than those materials reported recently. PAA molecules bound on the nanosheets played a crucial role in significantly enhancing the dye adsorption. The adsorption kinetics and isotherms of three dyes onto the MMoS2/PAA were well described by the pseudo-second-order kinetic and the Langmuir models. Moreover, the MMoS2/PAA also exhibited high removal efficiencies for various mixed-dye solutions. Besides, such a functional nanomaterial could be effectively recovered from dye solutions under an external magnetic field and reused for dye adsorption without compromising on its performance indicating it can serve as an excellent adsorbent for effective removal of a variety of cationic organic pollutants from industrial effluents.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Wei Xu,Tao Wang,Sanding Wu,Sheng Wang
Molybdenum disulfide (MoS 2 ) is a promising alternative anode material for lithium-ion batteries (LIBs). MoS 2 has unique layered crystal structure with a large and tunable interlayer distance, and is anticipated to have excellent rate and cycling stabilities due to improved lithium ion intercalation and de-intercalation. In this work, we successfully prepared novel N-doped carbon-coated MoS 2 nanosheets on hollow carbon microspheres . The composite spheres have an average diameter of 520 nm. We demonstrate that these electrodes show excellent electrochemical performance, which is attributed to the synergistic effect between the carbon microspheres, N-doped carbon coating, and MoS 2 nanosheets. The best performing electrode has high specific capacity of 997 mAh g −1 and good cycling stability, retaining a capacity of around 707 mAh g −1 at a current density of 100 mA g −1 after 120 cycles; furthermore, the electrode shows stable rate performance, retaining a capacity of 631 mAh g −1 at a current density of 2000 mA g −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 14
·6700-6708
·
IF 3.269
Huimin Zhao,Yaxi Li,Bing Tan,Yaobin Zhang,Xiaochi Chen,Xie Quan
To improve the peroxidase-like activity of molybdenum dichalcogenides (MoS2), surface modification, such as combing with monometallic or bimetallic nanoparticles, is of great and widespread interest. However, only a few studies have been reported on the modification of MoS2 with non-metallic materials. Herein, we report a study on the peroxidase-like activity of novel PEGylated MoS2 (PEG-MoS2) nanosheets prepared using a simple liquid-phase exfoliation and pegylation process. Compared to the undecorated MoS2 nanosheets, PEG-MoS2 nanosheets have improved water dispersiblity and stability, which are beneficial for improving the peroxidase-like activity, as well as the catalysis velocity and affinity for TMB or H2O2. Based on PEGylated MoS2, we successfully established a new platform for the colorimetric detection of H2O2 with a limit of detection (LOD) of 1.18 μM, which is comparable to that of the majority of the reported enzyme mimics of inorganic graphene analogues. More importantly, the as-prepared PEG-MoS2 nanosheets are environmentally friendly, water dispersible, low cytotoxic, and easily prepared, which indicate that PEG-MoS2 is a type of promising enzyme mimics and extremely likely to be applied in cell-based assay systems without any adverse reactions.
研究领域:
生物化学
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纳米医学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 8
·5730-5734
·
IF 1.483
Chen Qingai,Chen Huan,Li Zhihong,Pang Jie,Lin Tianran,Guo Liangqia,Fu FengFu
Glyphosate was found for the first time to inhibit the catalytic activity of MoS2 nanosheets, which could catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine by H2O2 to produce a colorimetric reaction. In the presence of glyphosate,
the absorbance and blue color of the system was decreased. Therefore, a simple and sensitive colorimetric sensing method for glyphosate based on the peroxidase mimetic activity of MoS2 nanosheets was developed. A linear relationship between the absorbance change and concentration
of glyphosate was observed over the range of 0.4—2.0 μg/mL (R
2 = 0.993) with a detection limit (3Ω/S) of 0.087 μg/mL. The colorimetric sensing method was simple, rapid, specific and sensitive, and the detection limit of 0.087 μg/mL is lower than the maximum
contaminant level of glyphosate in drinking water set by the Environment Protection Agency of USA and World Health Organization. This method was applied to detect glyphosate in environmental water samples with satisfactory results.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yong-Ping Gao,Ke-Jing Huang,Xu Wu,Zhi-Qiang Hou,Yuan-Yuan Liu
Uniform MoS 2 nanosheets assembling three-dimensional nanospheres are prepared by using a facile hydrothermal procedure with SiO 2 nanospheres as the template. The morphologies and structure of MoS 2 nanospheres are thorough characterized and evaluated as electrode material for supercapacitors . Galvanostatic charge/discharge measurements reveal that MoS 2 nanospheres deliver a specific capacity of 683 F/g at 1 A/g, and the specific capacity retains about 85.1% after 10000 cycles. An aqueous asymmetric supercapacitor is fabricated by employing MoS 2 nanospheres and activated carbon as the positive and negative electrodes, respectively. The specific capacitance is 65.33 F/g at a current density of 1 A/g. An energy density of 20.42 Wh/kg is obtained at power density of 750.31 kW/kg. The results show an attractive performance to take advantage of MoS 2 nanosheets assembling three-dimensional nanospheres as electrode material for supercapacitors . Two cells in series can easily light the light-emitting diode lamp brightly, further demonstrates the high energy storage capability of the prepared MoS 2 material.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Shao Su,Wenfang Cao,Wei Liu,Zaiwei Lu,Dan Zhu,Jie Chao,Lixing Weng,Lihua Wang,Chunhai Fan,Lianhui Wang
The detection of microRNA plays an important role in early cancer diagnosis. Herein, a dual-mode electronic biosensor was developed for microRNA-21 (miRNA-21) detection based on gold nanoparticle-decorated MoS 2 nanosheet (AuNPs@MoS 2 ). A classical DNA “sandwich” structure was employed to construct MoS 2 -based electrochemical sensor , including capture DNA, target miRNA-21 and DNA-modified nanoprobe. [Fe(CN) 6 ] 3-/4- and [Ru(NH 3 ) 6 ] 3+ were selected as electrochemical indicators to monitor the preparation process and evaluate the performance of MoS 2 -based electrochemical biosensor by electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV), respectively. Such MoS 2 -based biosensor exhibited excellent performance for miRNA-21 detection in the range from 10 fM to 1 nM with detection limit of 0.78 fM and 0.45 fM for DPV and EIS technique, respectively. Furthermore, the proposed MoS 2 -based biosensor displayed high selectivity and stability, which could be used to determine miRNA-21 in human serum samples with satisfactory results. All data suggested that such MoS 2 -based nanocomposite may be a potential candidate for biosensing ranging from nucleic acid to protein detection.
研究领域:
生物医学工程
·
分析化学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Xiaorong Gan,Huimin Zhao,Dangyuan Lei,Peifang Wang
Liquid phase exfoliation (LPE) is a promising method for synthesizing two-dimensional (2D) 2H-MoS 2 due to the balance obtained in the resulting yield and quality. Improvements in the electrocatalytic activity of 2D 2H-MoS 2 are typically attributed to an increased number of active sites at the plane edges. However, the conclusion need be carefully redefined in the case of LPE, because the covalent surface modification and solvent intercalation between layers can affect the electrocatalytic activity as well. In this study, bulk 2H-MoS 2 was exfoliated in three typical solvents, including N, N-dimethyl formamide (DMF), formamide, and 1-methyl-2-pyrrolidinone (NMP), to synthesize 2H-MoS 2 nanosheets . X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectrum were used to confirm the possibility of surface and interface functionalization of the 2H-MoS 2 nanosheets. Further, the effects on the electrocatalytic activity of 2H-MoS 2 nanosheets were investigated mainly by density functional theory periodic calculations based on the analysis of electronic energy band structures. The results have demonstrated that 2H-MoS 2 nanosheets prepared in formamide exhibit smaller average size and thickness, and higher electrocatalytic activity. The surface functionalization of the 2H-MoS 2 nanosheets is indeed generated by Mo-N covalent bonds due to the presence of S vacancies. Such covalent functionalization leads to a slight decrease of energy band gap with 0.03 eV in a (3 × 3 × 1) 2H-MoS 2 supercell. In contrast, the interface functionalization formed by the intercalation of solvent molecules (e.g., formamide) between layers can cause a remarkable decrease in the band gap of (1 × 1 × 2) 2H-MoS 2 , the phase transition from semiconductor to semimetal , higher carrier mobility, and smaller effective mass ( m e = 0.052 m 0 ).
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xiaolong Fu,Huiying Wu,Zhihong Liu,Pengzhao Wang,Jiefeng Rong,Fengfu Fu,Zhenyu Lin,Yongqiang Dong
The chemical enhancement of semiconductor-based surface-enhanced Raman scattering (SERS) substrates is an exciting hot topic. Herein, a simple hydrothermal method is developed to prepare molybdenum disulfide (MoS2), which can be easily exfoliated into monolayer nanosheets (MoS2NSs) by sonication, even in the absence of any surfactant. The obtained MoS2NSs contain two types of defects, namely, one caused by the incorporation of Mo atoms of high valence states and one caused by the incorporation of S22–. The density of the two types of defects can be easily tuned by controlling the ratio of Na2S and Na2MoO4 in the raw materials. The unique properties and the clear surface make the obtained MoS2NSs ideal models to investigate the effect of defects on the SERS activity of MoS2. It is found that the SERS activity of the obtained MoS2NSs increases dramatically with the defects caused by Mo atoms of high valence states, while it first increases and then decreases with the increase of defects caused by S22–. On the basis, MoS2NSs with high SERS activity and a low detection limit of 5.0 × 10–9 mol/L toward crystal violet (CV) are obtained. Moreover, the mechanism of defects affecting the SERS activity of MoS2NSs is revealed. The defects on one hand provide a large amount of dangling bonds that can combine CV molecules to form MoS2NS–CV complex and on the other hand provide extensive induced local dipoles and enhance the overall SERS spectrum of CV.
研究领域:
材料科学
·
纳米技术
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）