Nanoscale
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2014
·Vol. 6
·期 16
·9831-9838
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IF 6.739
Bang Lin Li,Ling Xiao Chen,Hao Lin Zou,Jing Lei Lei,Hong Qun Luo,Nian Bing Li
Electrochemically induced Fenton (electro-Fenton) reaction was used for efficient and controllable preparation of hydroxyl radicals, leading to the generation of luminescent quantum dots through etching of as-exfoliated MoS2 nanosheets. Morphologic changes of MoS2 nanosheets during the electro-Fenton reaction were monitored using transmission electron microscopy, showing that etching of MoS2 nanosheets induced by hydroxyl radicals resulted in rapid homogeneous fracturing of the sheets into small dots via a transition of nanoporous morphology. The as-generated dots with vertical dimensional thickness of ca. 0.7 nm and plane size of ca. 5 nm were demonstrated to be MoS2 quantum dots (MoS2-QDs), and their photoluminescence properties were explored based on quantum confinement, edge effect, and intrinsic characteristics. Moreover, the degree of etching and the concomitant porosity of MoS2 nanosheets could be conveniently tuned via the electro-Fenton reaction time, resulting in a new morphology of nanoporous MoS2 nanosheets, with potential new applications in various significant areas.
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Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 22
·8734-8741
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IF 8.262
Jingwen Zhou,Jian Qin,Naiqin Zhao,Chunsheng Shi,En-Zuo Liu,Fang He,Jiajun Li,Chunnian He
Constructing a 3D porous architecture from 2D MoS2 nano-building blocks has been considered as a promising approach to prevent restacking and thus achieve superior properties in energy conversion and storage, catalysis, sensors, and so on. In this work, a novel salt (NaCl) template-assisted solid-phase synthesis strategy is developed to fabricate a new type of MoS2 with a robust 3D honeycomb-like structure without the necessity to use a solution reaction. As a demonstration of structural advantages, the 3D honeycomb-structured MoS2 with a highly crystalline architecture and intimate interfacial bonding between adjacent MoS2 walls is utilized as a lithium-ion battery anode, exhibiting an unprecedented initial coulombic efficiency (∼93.5%), large specific capacity, high rate capability and excellent cycle stability.
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ACS Applied Materials & Interfaces
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2016
·
IF 7.145
Wei Gu,Yinghan Yan,Cuiling Zhang,Caiping Ding,Yuezhong Xian
In this work, a bottom-up strategy is developed to synthesize water-soluble molybdenum disulfide quantum dots (MoS2 QDs) through a simple, one-step hydrothermal method using ammonium tetrathiomolybdate [(NH4)2MoS4] as the precursor and hydrazine hydrate as the reducing agent. The as-synthesized MoS2 QDs are few-layered with a narrow size distribution, and the average diameter is about 2.8 nm. The resultant QDs show excitation-dependent blue fluorescence due to the polydispersity of the QDs. Moreover, the fluorescence can be quenched by hyaluronic acid (HA)-functionalized gold nanoparticles through a photoinduced electron-transfer mechanism. Hyaluronidase (HAase), an endoglucosidase, can cleave HA into proangiogenic fragments and lead to the aggregation of gold nanoparticles. As a result, the electron transfer is blocked and fluorescence is recovered. On the basis of this principle, a novel fluorescence sensor for HAase is developed with a linear range from 1 to 50 U/mL and a detection limit of 0.7 U/mL.
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APPLIED SURFACE SCIENCE
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2017
·
IF 3.387
Qiang Huang,Meiying Liu,Junyu Chen,Qing Wan,Jianwen Tian,Long Huang,Ruming Jiang,Yuanqing Wen,Xiaoyong Zhang,Yen Wei
Molybdenum disulfide (MoS 2 ) is a novel type of two-dimensional nanomaterial, which has attracted great research attention for its excellent physicochemical properties and possible applications. In this work, we prepared a novel MoS 2 composite (MoS 2 -PDOPA) through the self-polymerization of levodopa (DOPA) on the surface of MoS 2 under a weak alkaline solution. The obtained samples, including pure MoS 2 and MoS 2 -PDOPA composite were characterized by energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS) analyses. The potential environmental applications of MoS 2 -PDOPA were evaluated by using MoS 2 -PDOPA as adsorbent to remove methylene blue (MB) from aqueous solution. Batch experiments were carried out to investigate the effect of various operational parameters such as contact time, initial MB concentration, solution pH and temperature on the adsorption of MB by MoS 2 -PDOPA. According to the adsorption kinetics, isotherms and thermodynamics analysis, the MB adsorption onto MoS 2 -PDOPA follows the intraparticle diffusion model and Langmuir isotherm model, and the MB adsorption process is spontaneous and endothermic. The maximum adsorption capacity of MoS 2 -PDOPA is calculated to be 244.03 mg/g at 298 K. As compared with unmodified MoS 2 , the adsorption capacity of MoS 2 -PDOPA is obviously improved. Taken together, we developed a facile method to prepare MoS 2 -PDOPA composites based on mussel inspired chemistry. The resultant composites could be utilized as efficient adsorbents with great potential for environmental adsorption applications.
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Nano Energy
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2016
·
IF 11.553
Fukun Ma,Yongzhong Wu,Yongliang Shao,Yueyao Zhong,Jiaxin Lv,Xiaopeng Hao
CdS systems represent promising photocatalysts for hydrogen generation ; however, these systems are seriously restricted by inherent issues with photocorrosion. Here, the CdS photocorrosion process is prevented and a high stable and effective photocatalyst is obtained in the novel 0D/2D CdS/MoS 2 nanosheet composite system . According to crystallization kinetics , the CdS photocorrosion process will be prevented if the S elements resulting from photocorrosion can be reduced back to S 2− in the same photocatalytic system. So a photocorrosion-recrystallization strategy is proposed for the first time to resolve issues with photocorrosion when using CdS photocatalysts. Meanwhile, the recrystallized 0D/2D CdS/MoS 2 nanocomposite produces a high quantum efficiency of 23.03% (λ ex =420 nm), the evolution of hydrogen presents no notable activity losses for up to 400 h. Thus, the approach demonstrated here represents a promising method of designing and fabricating more stable and efficient composite chalcogenide photocatalysts.
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SENSORS AND ACTUATORS B-CHEMICAL
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2017
·
IF 5.401
Hao Lin Zou,Bang Lin Li,Hong Qun Luo,Nian Bing Li
Recently, hybrids of layered MoS 2 are highly encouraged to handle the puzzles, taken by the weakness of two-dimensional (2D) transition metal dichalcogenides (TMDC), including low conductivity and lack of active edge sites. Considering the merits of zero-dimensional (0D) nanomaterials, the emerging heterostructures based on 0D Au nanoparticles and 2D MoS 2 nanosheets (MoS 2 -NSs) are successfully obtained via a spontaneously reduced process with the addition of HAuCl 4 in exfoliated MoS 2 -NSs aqueous dispersions. Significantly, with the combination of high conductivity rate and large active surface, the synthetic effect results in a diversity of improved properties of 0D-2D heterostructures, not only exhibiting improved stability, but also remarkably enhancing the selectivity and sensitivity for electrochemically simultaneous detections of dopamine, ascorbic acid, uric acid, and nitrite. Our current achievements of 0D-2D heterostructures contribute fresh ideas to the overall development of more advanced future TMDC based sensors.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Huanyu Liang,Xinyu Wang,Jing Shi,Jingwei Chen,Weiqian Tian,Minghua Huang,Jingyi Wu,Yue Zhu,Huanlei Wang
The means of structural hybridization such as heterojunction construction and carbon-coating engineering for facilitating charge transfer and electron transport are considered viable strategies to address the challenges associated with the low rate capability and poor cycling stability of sulfide-based anodes in potassium-ion batteries (PIBs). Motivated by these concepts, we have successfully prepared a hydrangea-like bimetallic sulfide heterostructure encapsulated in nitrogen-doped carbon (FMS@NC) using a simple solvothermal method, followed by poly-dopamine wrapping and a one-step sulfidation/carbonization process. When served as an anode for PIBs, this FMS@NC demonstrates a high specific capacity (585 mAh g −1 at 0.05 A/g) and long cycling stability. Synergetic effects of mitigated volume expansions and enhanced conductivity that are responsbile for such high performance have been verified to originate from the heterostructured sulfides and the N -doped carbon matrix. Meanwhile, comprehensive characterization reveals existence of an intercalation-conversion hybrid K-ion storage mechanism in this material. Impressively, a K-ion capacitor with the FMS@NC anode and a commercial activated carbon cathode exhibits a superior energy density of up to 192 Wh kg −1 , a high power density, and outstanding cycling stability. This study provides constructive guidance for designing high-performance and durable potassium-ion storage anodes for next-generation energy storage devices.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Meimei Xu,Shuai Zhao,Chenglong Lin,Yanyan Li,Weida Zhang,Yusi Peng,Rui Xiao,Zhengren Huang,Yong Yang
Lateral flow immunoassay (LFIA) has been widely used for the early diagnosis of diseases. However, conventional colorimetric LFIA possesses limited sensitivity, and the single-mode readout signal is easily affected by the external environment, leading to insufficient accuracy. Herein, multifunctional Fe3O4@MoS2@Pt nanotags with a unique “pompon mum”-like structure were triumphantly prepared, exhibiting excellent peroxidase (POD)-like activity, photothermal properties, and magnetic separation capability. Furthermore, the Fe3O4@MoS2@Pt nanotags were used to establish dual-mode LFIA (dLFIA) for the first time, enabling the catalytic colorimetric and photothermal dual-mode detection of severe acute respiratory syndrome coronavirus 2 nucleocapsid protein (SARS-CoV-2 NP) and influenza A (H1N1). The calculated limits of detection (cLODs) of SARS-CoV-2 NP and H1N1 were 80 and 20 ng/mL in catalytic colorimetric mode and 10 and 8 ng/mL in photothermal mode, respectively, demonstrating about 100 times more sensitive than the commercial colloidal Au-LFIA strips (1 ng/mL for SARS-CoV-2 NP; 1 μg/mL for H1N1). The recovery rates of dLFIA in simulated nose swab samples were 95.2–103.8% with a coefficient of variance of 2.3–10.1%. These results indicated that the proposed dLFIA platform showed great potential for the rapid diagnosis of respiratory viruses.
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Journal of Cleaner Production
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2024
·
IF 9.7
Junfei Liu,Yingbo Dong,Yue Zhang,Wei Liu,Jian Xu,Hai Lin
The toxicity of antibiotic and heavy metal combined pollutants is greater than single antibiotic, achieving its synergistic removal is the key. In this work, a novel g-C 3 N 4 /MoS 2 photocatalyst with hollow structure (CN/MS-V-3) was fabricated by one-step solvothermal method . As expected, CN/MS-V-3 showed an outstanding removal efficiency for tetracycline and Cu 2+ of 98.49% and 99.90%, respectively. The excellent photocatalytic degradation performance for tetracycline in compound wastewater mainly ascribed to the enhanced visible-light capture ability by hollow structure of CN/MS-V-3, formation 1 O 2 and ·OH, and the cycle of Cu 2+ /Cu + and Mo 2+ /Mo 4+ induced the fast electrons transport . The contamination of Cu 2+ in wastewater can play as an accelerator in the CN/MS-V-3 reaction system to improve the degradation performance of tetracycline. DFT results indicated that CN/MS-V-3 heterojunction was formed by combination of side surface MoS 2 –V and g-C 3 N 4 , and the Cu adsorption onto CN/MS-V-3 showed a potential formation of Cu–N and Cu–S bonds. In addition, the tetracycline degradation pathways and evaluation of toxicity of intermediates were also proposed. This work not only provides a promising technology for antibiotic and heavy metal combined contamination removal, but also a clever use of Cu variable valence to accelerate electron cycling to improve the removal performance of the CN/MS-V-3.
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TALANTA
·
2025
·
IF 6.1
Ninghan Tang,Chaoting Shi,Xiandeng Hou,Hui Xin,Lan Wu
Excessive use of tetracycline poses risks to human health and the ecological balance, which poses challenges to develop a method for facile and reliable detection of tetracycline. Herein, the MoS 2 QDs@ZIF-8 was prepared through a simple method, serving as an asynchronous response sensor for the naked-eye detection of tetracycline. The photoinduced electron transfer between the composite sensor and target tetracycline led to quench the blue fluorescence emitted by MoS 2 QDs. Hydrogen bond, chelation, π-π stacking and pore effect between the composite sensor and tetracycline made the aggregation of tetracycline, significantly enhancing the intrinsic yellow fluorescence of tetracycline. Moreover, it also exhibited good detection performance for the real samples such as river water, farm wastewater, honey and milk, demonstrating that it was suitable for naked-eye visualization detection in the field. This work provided a novel approach for constructing ratiometric fluorescence sensors with asynchronous response.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Bao Pan,Ge Jin,Wen Chen,Jiani Qin,Fei Li,Chuanyi Wang
Transition metal doping and nanostructure engineering are effective strategies to overcome the limitations of photocatalysts in peroxomonosulfate (PMS) activation. In this study, Cu-doped MoS 2 with a hierarchical microspheric architecture was synthesized via a one-step hydrothermal method and employed for tetracycline (TC) degradation through PMS activation. Under visible light irradiation, the Cu 0.06 -MoS 2 catalyst achieved an 86.2% TC removal efficiency within 40 min, which was 2.3 times higher than that of pristine MoS 2 . The effects of various operation parameters, including initial PMS concentration, reaction temperature, solution pH, and coexisting inorganic anions on the TC degradation efficiency were thoroughly investigated. Characterization results and theoretical calculations demonstrated that the redox cycles of Cu 2+ /Cu + and Mo 6+ /Mo 4+ , as well as the 3D microspheric structure of Cu 0.06 -MoS 2 , support its ultra-high charge transfer capability and abundant exposure of active sites, thereby promoting efficient photocatalytic activation of PMS for TC degradation. Reactive species quenching experiments and EPR analysis revealed that ·O 2 − , •OH, and SO 4 •− are the primary reactive oxygen species involved in TC degradation. This study provides a promising direction for the development of highly efficient micropollutant degradation utilizing transition metals-modified sulfide photocatalysts with a 3D architecture.
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OPTICS AND LASER TECHNOLOGY
·
2024
·
IF 4.6
Cheng Lu,Weiyu Fan,Xiaoyu Zhao,Kaixin Li,Lezheng Wang,Yutian He,Huanian Zhang,Nannan Xu,Guomei Wang,Wenfei Zhang,Caixun Bai,Shenggui Fu
In practical applications, high repetition frequency (HRF) lasers are widely used in the fields of material processing, laser communication and medical therapy. In this work, the passive harmonic mode-locked (HML) technique is used to realize a HRF fiber laser in GHz level, effectively overcoming the limitations of traditional fiber laser structures. In order to maximize the advantages of nanomaterials, we synthesized high-purity hollow MoS 2 -Co 3 S 4 heterojunction materials by hydrothermal method. Then, a “sandwich” structure saturable absorber (SA) was prepared by photodeposition, and its nonlinear optical properties were investigated. The results demonstrate that the modulation depth and saturation intensity of MoS 2 -Co 3 S 4 SA are 24 % and 4.53 MW/cm 2 , respectively. The fiber laser based on MoS 2 -Co 3 S 4 SA could realize the fundamental frequency mode-locked at 23.11 MHz with a pulse width of 0.99 ps. In addition, various high-order HML are realized with this laser system capable of stable operation for extended periods up to the highest repetition frequency of 1.109 GHz achieved thus far in this field. This research provides strong support to promote the development and commercialization of HRF fiber lasers.
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