JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Depeng Zhang,Junjuan Qian,Yinhui Yi,Odoom Jibrael Kingsford,Gangbing Zhu
Since acetaminophen (ACAP) and 4-aminophenol (4-AP, the degradation product from ACAP) have different properties and toxicities, the simultaneous electrochemical determination of ACAP and 4-AP is very important. In this work, nitrogen-doped hollow carbon spheres wrapped with MoS 2 nanosheets (MoS 2 @NHCSs) novel hybrids were synthesized via a simple step-by-step method and consecutively the obtained MoS 2 @NHCSs was successfully used to construct a reliable electrochemical sensor for simultaneously detecting acetaminophen (ACAP) and 4-aminophenol (4-AP). Owing to the synergetic properties of each component in MoS 2 @NHCSs nanohybrids (MoS 2 has highly catalytic activity and can offer many active sites; NHCSs can impede the aggregation tendency and enhance the effective surface area of MoS 2 as well as increasing the conductivity of the nanohybrids), the experimental results demonstrated that the electrochemical responses of both 4-AP and ACAP at MoS 2 @NHCSs modified electrode are much better than those at NHCSs or MoS 2 modified electrodes. Importantly, the MoS 2 @NHCSs nanohybrids can show excellent electrochemical sensing performance for the sensitive and selective as well as simultaneous determination of ACAP and 4-AP. After optimizing various conditions, the proposed MoS 2 @NHCSs-based sensor has wide linear range and low detection limit for ACAP and 4-AP analysis.
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高影响因子
TALANTA
·
2019
·
IF 4.916
Feng Zhang,Shuang Wang,Jian feng,Rong Zou,Ling Xiang,Changqun Cai
A molecular beacons (MBs) loaded on molybdenum disulfide (MoS 2 ) nanosheets as fluorescence probes for sensitive and versatile detection of microRNAs (miRNAs) through hybridization chain reaction (HCR) has been designed. MoS 2 was used as a adsorbent to capture the MBs and a selective fluorescence quencher to reduce the background signal. In the absence of miRNAs, HCR could not be triggered due to the stability of MB probes. The probes attached to the MoS 2 surface, efficiently quenching fluorescence of the G-quadruplex/Thioflavin T . However, the presence of target miRNAs triggers the HCR process to generate large amount of HCR products. Meanwhile, the HCR products of long nanowires chain with abundant G-quadruplexes could not be adsorbed on the surface of MoS 2 , and therefore detach from the MoS 2 . Consequently, Thioflavin T could be embedded in G-quadruplexes and produced strong fluorescence signal. This fluorescence emission signal could achieve detection of miRNA as low as 4.2 pM and a wide linear ranges from 0.1 to 100 nM. In addition, a versatile fluorescence probe has been developed for detection of miRNA-21 by changing the miRNA-recognition domain of MB. Thus, the fluorescent probe would be a potential alternative tool for biomedical research and clinical molecular diagnostics.
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RSC Advances
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2019
·Vol. 9
·期 8
·4635-4643
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IF 3.049
Xiufang He,Zhansheng Wu,Yongtao Xue,Zhenzhen Gao,Xia Yang
Graphitic carbon nitride (g-C3N4) has been considered to be a promising metal-free photocatalyst, although the high recombination rate of charge carriers and poor absorption of visible light have limited its applications. In order to overcome these problems, an interlayer composite photocatalyst that comprised β-cyclodextrin (β-CD), oxygen-doped C3N4 (O-C3N4) and molybdenum disulfide (MoS2) was successfully constructed for the highly enhanced photodegradation of glyphosate in this study. The structure and morphology, optical properties, and photoelectrochemical properties of the prepared photocatalyst were characterized via a series of characterization techniques. The average fluorescence lifetime of the composite photocatalyst was extended from 6.67 ns to 7.30 ns in comparison with that of g-C3N4, which indicated that the composite photocatalyst enhanced the absorption of visible light and also inhibited the recombination of electron–hole pairs. The mass ratio of MoS2 that corresponded to O-C3N4/MoS2-5 enabled the highest removal rate under simulated sunlight irradiation, which was almost twice that achieved using pure g-C3N4. Relative species scavenging experiments revealed that ·O2− was the main species during the process of photodegradation. Besides, a toxicity test indicated that glyphosate became less toxic or non-toxic after photodegradation. This study provided an effective, feasible and stable photocatalyst driven by simulated sunlight irradiation for the highly enhanced photodegradation of glyphosate.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yaoyao Liu,Chunmei Zeng,Lunhong Ai,Jing Jiang
Cadmium sulfide (CdS) has been currently emerged as a promising class of photocatalyst candidates toward hydrogen evolution from water photosplitting because of its unique electronic structure and favorable optical property . However, pure CdS often suffers from the poor stability and fast charge carrier recombination. Cocatalyst engineering is an effective strategy to activate photocatalytic performance of CdS but remains a challenge. Herein, we develop an effective hydrothermal method to construct microwave-derived CdS nanocrystals hybridized with MoS 2 nanosheets . Such hybrids bear the nanocrystal-on-nanosheet heterostructures , ensuring the intimate interfacial contact and increased charge transfer kinetics. The resulting CdS/MoS 2 hybrids exhibit highly efficient photoreactivity and excellent photostability for hydrogen evolution under visible light irradiation. The hydrogen generation rate achieved by the optimal CdS/MoS 2 is approximately 286 times higher than that of pure CdS. This remarkably boosted performance could be ascribed to synergistically interfacial effect that brings an energy-beneficial driving force to realize the highly efficient transfer, migration, and separation of photoexcited charge carriers.
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MATERIALS & DESIGN
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2019
·
IF 5.77
Chao Zhang,Jiameng Wang,Ruifang Chi,Jing Shi,Yongqiang Yang,Xiangyu Zhang
Bacterial infections are closely in correlation with chronic wounds, and overcoming these problems is still challenging. Herein, a polyvinyl alcohol (PVA) hydrogel incorporated with reduced graphene oxide (RGO)/MoS 2 /Ag 3 PO 4 composites is fabricated for highly efficient sterilization during wound healing under light irradiation. RGO/MoS 2 /Ag 3 PO 4 composite is first prepared by a two-step process containing hydrazine reduction and in-situ deposition, then the hybrid hydrogel is prepared using a freeze-thaw cycle method. After doping with RGO/MoS 2 /Ag 3 PO 4 composite, the hydrogel shows better mechanical property and swelling ratio. The hybrid hydrogel also exhibits excellent antibacterial properties against both Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ) under co-irradiation of 660 nm visible light (VL) and 808 nm near-infrared (NIR) light within 10 min because of the synergistic effects rendered by the photodynamic and photothermal antibacterial treatments. The introduction of RGO/MoS 2 /Ag 3 PO 4 composite has no appreciable influence on the cell viability and cell morphology. Importantly, the hybrid hydrogel effectively reduces the bacterial infection-related inflammation during wound healing. Thus, this RGO/MoS 2 /Ag 3 PO 4 -incorporated hydrogel has great potential in antibacterial wound healing dressing.
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Functional Materials Letters
·
2019
·
IF 1.388
Wei Nie,Xiaolin Liu,Yueting Zhou,Jiemei Luo,Shengwen Zhong
This paper reports the synthesis MoS 2 /graphene composite as an anode using commercial graphene as conductive enhancer and structural modifier. X-ray powder diffraction (XRD) and morphology details show that the as-synthesized MoS 2 /graphene composite has hexagonal structure and shows three-dimensional hierarchical network structure. The anode electrochemical properties of MoS 2 /graphene composite and pure MoS 2 were measured and analyzed by galvanostatic charge–discharge cycling vs. Na/Na + at different current densities in 0.05–3.0 V. Compared to pure MoS 2 , MoS 2 /graphene composite demonstrates great specific capacity (509 mAh g − 1 at the current rate about 0.3 C), excellent rate capability (305 mAh g − 1 at the maximum current rate 5 C) and relatively good cycle-life (capacity reached 84% after 100 cycles). Moreover, the facile synthesis strategy of MoS 2 /graphene can provide a reference for designing other transition metal chalcogenides composites containing graphene for high performance SIBs.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Jia Yan,Sichao Wang,Yuan Chen,Ming Yuan,Yunpeng Huang,Jiabiao Lian,Jingxia Qiu,Jian Bao,Meng Xie,Hui Xu,Huaming Li,Yan Zhao
NiS/MoS 2 composite nanosheets were designed and prepared via facile ion-exchange, freeze-drying, and Ostwald ripening processes. MoS 2 nanosheets served as backbones to absorb Ni 2+ ions and form NiS nanosheets. The electrode based on the NiS/MoS 2 composite nanosheets exhibited an ultrahigh specific capacity of 343.5 mA h g −1 at 9 A g −1 , which was superior to that of as-prepared MoS 2 nanosheets (125.8 mA h g −1 ) and Ni(OH) 2 nanosheets (148.9 mA h g −1 ). In addition, NiS/MoS 2 composite nanosheets presented an enhanced rate performance and good life cycle due to their hierarchical structure, high surface area with numerous active sites, and synergistic performance. A NiS/MoS 2 //AC asymmetric supercapacitor device operated in a large potential window (0–1.5 V) delivered a high capacitance of 48.4 F g −1 at 0.1 A g −1 , an excellent energy density of 15.1 Wh kg −1 and a very high power density of 2.25 kW kg −1 . This smart in situ construction process opens a new route to synthesize binary metal sulfides for high-performance energy storage devices.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
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IF 4.229
Baodong Mao,Bo Wang,Furong Yu,Kewei Zhang,Zhengyuan Zhang,Jinhui Hao,Junbo Zhong,Yanhong Liu,Weidong Shi
In this paper, a facile hydrothermal synthetic strategy was developed for MoS 2 nanoflowers with enlarged interlayer spacing on the carbon cloth (CC) as a high efficiency cathode electrode for hydrogen evolution reaction (HER) under wide pH condition . It was observed that the loading amount of MoS 2 has a major impact on the HER performance, where the optimized MoS 2 /CC exhibited a low onset potential of 94 mV and a small Tafel slope of 50 mV dec −1 in strong acid solution (pH = 0). The improved HER performance can be contributed to the enlarged interlayer spacing, abundant defects and more exposed active sites in the small size MoS 2 nanosheets as revealed by XRD and HRTEM. Meanwhile, it also exhibited relatively good performance for HER under basic and neutral conditions with the overpotentials of 188 (pH = 14) and 230 (pH = 7) mV to achieve current density of 10 mA cm −2 and the Tafel slopes of 52 and 84 mV dec −1 , respectively.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
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IF 5.667
Dandan Song,Yuanzhe Wang,Xiong Lu,Yukun Gao,Yan Li,Faming Gao
Two-dimensional (2D) MoS 2 shows great potential in the areas of electrochemical sensors due to their ultrathin structure and predominant physicochemical properties. However, pristine 2D MoS 2 nanostructure exists inherent disadvantages such as the limited electrical conductivity, surface area and easy aggregation or restacking. Here, nitrogen-fluorine co-doped monolayer 2D MoS 2 nanosheet decorated with Ag nanoparticles (Ag NPs-N-F-MoS 2 ) nanocomposite is prepared and it exhibits superior conductivity, remarkable electron mobility and high electroactive surface area. The obtained Ag NPs-N-F-MoS 2 are employed as a sensing platform for the electrochemical determination of organophosphate pesticide, coupled with enzymatic inhibition. Under optimized conditions, the acetylcholinesterase (AChE)/amino functionalized carbon nanotubes (CNTs-NH 2 )/Ag NPs-N-F-MoS 2 bioelectrode is superior in sensing performances for the detection of monocrotophos and chlorpyrifos, with wide linear ranges, low detection limit as low as 0.05 pg mL −1 (0.2 pM) and 1 pg mL −1 (3 pM) at a signal-to-noise ratio of 3, satisfactory selectivity, reproducibility and long-time storage stability. All results indicate that the Ag NPs-N-F-MoS 2 nanocomposite holds great promise for constructing an ultra-sensitive electrochemical sensing interface for the determination of pesticides.
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BIOSENSORS & BIOELECTRONICS
·
2018
·
IF 8.173
Xiaoqiang Liu,Peipei Liu,Yunfei Tang,Liwei Yang,Lele Li,Zhichong Qi,Deliang Li,Danny K.Y. Wong
In this work, a sensitive photoelectrochemical aptasensor was developed for kanamycin detection using an enhanced photocurrent response strategy, which is based on the surface plasmon resonance effect of gold nanoparticles deposited on a 3D TiO 2 -MoS 2 flower-like heterostructure . A significant aspect of this development lies in the photoelectrochemical and morphological features of the unique ternary composite, which have contributed to the excellent performance of the sensor. To develop an aptasensor, mercapto-group modified aptamers were immobilised on the photoactive composite as a recognition unit for kanamycin. The TiO 2 -MoS 2 -AuNP composite was demonstrated to accelerate the electron transfer , increase the loading of aptamers and improve the visible light excitation of the sensor. Under optimal conditions, the aptasensor exhibited a dynamic range from 0.2 nM to 450 nM of kanamycin with a detection limit of 0.05 nM. Overall, we have successfully synergised both the electrical and the optical merits from individual components to form a ternary composite, which was then demonstrated as an effective scaffold for the development of PEC biosensors.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Jingying Duan,Guohui Qin,Luofu Min,Yuchen Yang,Chengyang Wang
The photochemistry and sodium storage process have been generally considered as two separated approaches without strong connection. Here, ultraviolet (UV) irradiation was applied to sodium-ion batteries to improve the electrochemical performance of MoS2-based composites. C@MoS2@CN nanospheres consist of double protective structures, including inner hollow carbon spheres with a thin wall (C) and outer N-doping carbon nanosheets (CNs) derived from polydopamine. The special nanostructure possesses the virtues such as wide-interlayer spacing, flexible feature with great structure integrity, and rich active sites, which endow the fast electron transfer and shorten the ion diffusion pathways. Under the excitation of UV-light, intense electrons and holes are accumulated within MoS2-based composites. The excited electrons can promote the preinsertion of Na+. More importantly, dense electrons promote the electrolyte to decompose and hence form a stable solid electrolyte interphase in advance. After UV-light irradiation treatment in the electrolyte, the initial Coulombic efficiency of C@MoS2@CN electrodes increased from 48.2 to 79.6%, and benefiting from the fine nanostructure, the C@MoS2@CN electrode with UV irradiation treatment delivered a great rate performance 116 mAh g–1 in 20 s and super cycling stability that 87.6% capacity was retained after 500 cycles at 500 mA g–1. When employed as anode for sodium-ion hybrid capacitors, it delivered a maximum power density of 6.84 kW kg–1 (with 114.07 Wh kg−1 energy density) and a maximum energy density of 244.15 Wh g–1 (with 152.59 W kg–1 power density). This work sheds new viewpoints into the applications of photochemistry in the development of energy storage devices.
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NANOTECHNOLOGY
·
2018
·Vol. 29
·期 42
·425702
·
IF 3.404
Zhishu Guan,Chao Wang,Wenjie Li,Suibin Luo,Yingbang Yao,Shuhui Yu,Rong Sun,Ching-Ping Wong
A facile, efficient and environmentally friendly process to exfoliate MoS2 is essentially critical to apply the obtained mono- and few-layer nanosheets in various electronic devices and sensors. Here we report a liquid phase exfoliation method for exfoliation of MoS2, which employs a surfactant of sodium dodecyl benzene sulfonate (SDBS) in water. The nonpolar benzene rings in SDBS can firmly bind to the MoS2 layer, facilitating the effective exfoliation of nanosheets in aqueous solution. It is found that the exfoliation efficiency and thickness of MoS2 nanosheets are related to the concentration of SDBS, and the mechanism was investigated. Defect free mono- and few-layer MoS2 nanosheets are obtained by controlling the amount of SDBS in solution, which exhibit stable dispersion in water over months, and it renders them as having great potential for solution-based device fabrication.
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