JOURNAL OF MOLECULAR STRUCTURE
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2025
·
IF 4.7
Xiongyi Peng,Jianyu Li,Xujia Cao,Jiarui Zhang,Yongqiang Li,Yufeng Liu
Constructing semiconductor composites composed of multiphase heterojunctions has been considered as an effective strategy for designing promising photocatalyst systems. In this work, a novel ternary heterojunction photocatalyst was prepared by integrating MoS 2 semiconductor nanoflowers with silver doped covalent organic frameworks (COFs) and used for photocatalytic degradation of antibiotics. The regular pore structure and solid skeleton of COFs matrix optimize the distribution of constituent units, making Ag-MoS 2 nanoflower uniform and highly dispersed on the COFs material matrix. Moreover, the silver nanoparticles in the catalyst acted as an electron mediator, which inhibited the recombination of charge carriers, and effectively enhanced the photocatalytic activity of Ag-MoS 2 @COF. The as-prepared Ag-MoS 2 @COF ternary heterojunction photocatalyst exhibited high degradation efficiency for tetracycline (TC), reaching 90.1 % after 50 min of visible light irradiation, which was superior to most heterojunction photocatalysts. The Ag-MoS 2 @COF also demonstrated good reusability, almost maintaining the initial photocatalytic efficiency after 5 cycles. In addition, the plausible direct solid-state Z-scheme photocatalytic mechanism for TC degradation with Ag-MoS 2 @COF ternary catalyst under visible light irradiation was proposed according to LC-MS analysis, radicals trapping experiment and photoelectric chemical test. This work provides a new paradigm for the design and development of COF-based ternary heterojunction photocatalysts for environmental remediation.
研究领域:
材料科学
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环境科学
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光催化技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Fangbin Wang,Jing Qi,Liang Zhu
Bacterial infection and contamination is a tough problem that generates numerous hazardous factors in areas ranging from human health, clinical to industrial manufacture. Here, an Ag/MoS 2 nanozyme-modified ZnO nanopillar surface was designed and assembled. This nanopillar surface can achieve remarkable antibacterial effects against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli . The obtained nanozyme-modified nanopillar surface demonstrated mechanical antibacterial property with a killing rate of 69.6% and 70.4% to Staphylococcus aureus and Escherichia coli , respectively. Moreover, the surface disables bacteria under H 2 O 2 efficiently, reaching a lethality rate of 89.7% and 98.4% in 30 min, respectively. The superiorities of fast and high lethality rate are owed to a synergistic antibacterial functions consisted of mechanical rupture, enormous ROS generation and silver ions release. Meanwhile, the nanozyme-modified nanopillar surface also shows the surface superhydrophobic property with an antibacterial adhesion rate of over 99.9%. Therefore, the scheme pdresented in this study can provide a potential perspective to solve bacterial infection and contamination in the fields of daily life, clinical and industrial manufacture.
研究领域:
生物材料学
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微生物学
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纳米医学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2019
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IF 0
Le Zhou,Hongwen Zhang,Haoming Bao,Yi Wei,Hao Fu,Weiping Cai
Silver (Ag)-based Janus nanoparticles (NPs) are of broad interest for extensive applications due to their excellent photoelectric performances and special structure. However, it still remains challenging to prepare this type of Janus NP with high uniformity in a large scale. Here, we present a facile wet-chemical strategy to synthesize Ag-MoS2 Janus NPs via adding an appropriate amount of AgNO3 into the MoS2 nanosphere (200 nm in size)-contained aqueous solution. These Janus NPs represent a new type of heterogeneous nanostructure. Each Janus NP is made up of one tiny-Ag-dot-decorated MoS2 nanosphere and one polyhedral Ag single crystal (∼100 nm in size), and both of them attach together, showing a snowman-like dimer. Such Janus NPs or dimers can not be detached by the ultrasonic vibration even with a high power, showing strong adhesion between them. Further, the morphology and size of the polyhedral Ag nanocrystals attached on MoS2 nanospheres can be controlled by the AgNO3 addition amount, reaction time, and temperature. A growth model is proposed to understand the formation of these Janus NPs, which is based on the tiny Ag dots’ aggregation and oriented connection mechanism. Importantly, such Ag-MoS2 Janus NPs can be used as nanomotors, due to their asymmetric catalytic component structure, and self-propelled in H2O2 fuel solutions. They show good directional motion and significant dependence of their speed on fuel concentration. This study expands our understanding of the formation of heterogeneous Janus particles and provides a promising platform to investigate active colloids as nanomotors.
研究领域:
材料科学
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纳米技术
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催化化学
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产品关联
DOI
JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 1
·1-13
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IF 2.127
Wu Jie,Zhou Yifeng,Nie Wangyan,Chen Pengpeng
This paper reported a one-step synthesis of Ag 2 S/Ag@MoS 2 nanocomposites and its applications in the surface-enhanced Raman scattering (SERS) detection and photocatalytic degradation of organic pollutants. The nanocomposites were well characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), cyclic voltammograms (CV), the Brunauer-Emmett-Teller (BET), and Fourier transforms infrared spectra (FTIR). The AgNPs were uniformly dispersed on the MoS 2 nanosheets and the particle size of the AgNPs was about 10–30 nm. These Ag 2 S/Ag@MoS 2 nanocomposites offered sensitive SERS signals for the detection of R6G with the limit of detections as low as 10 −10 M. The photocatalytic activity of the composite catalyst was studied by the degradation of methylene blue (MB) dye under light illumination. The apparent rate constant of MB degradation for the obtained catalyst could reach 6.6 × 10 −2 min −1 , indicating that the novel Ag 2 S/Ag@MoS 2 nanocomposites can be explored for organic pollutant’s detection and degradation.
One-step synthesis of Ag 2 S/Ag@MoS 2 nanocomposites for SERS and photocatalytic applications
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Yaoguang Wang,Yulan Wang,Dan Wu,Hongmin Ma,Yong Zhang,Dawei Fan,Xuehui Pang,Bin Du,Qin Wei
In this work, a label-free electrochemical immunosensor was developed for the quantitative detection of carcinoembryonic antigen (CEA). Flower-like Ag/MoS 2 /rGO nanocomposites were employed as the signal amplification platform of the designed immunosensor for the first time. Due to the synergistic effect between molybdenum disulfide (MoS 2 ), reduced graphene oxide (rGO) and Ag nanoparticles (NPs), Ag/MoS 2 /rGO nanocomposites could provide a high sensitivity for the label-free electrochemical immunosensor. The detection mechanism was based on the monitoring of the electrocatalytic current response change towards the reduction of hydrogen peroxide (H 2 O 2 ) when immunoreaction occurred on the surface of the electrode modified with Ag/MoS 2 /rGO nanocomposites. Using amperometric i-t curve to record the electrocatalytic process, the proposed immunosensor achieved an ultrasensitive and specific detection of CEA with a low detection limit of 1.6 fg/mL. Under optimal conditions, the fabricated immunosensor exhibited acceptable reproducibility, selectivity and excellent stability. This designed immunosensor could provide an effective method in the clinical diagnosis of other tumor markers.
研究领域:
生物医学工程
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分析化学
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肿瘤学
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产品关联
DOI
高影响因子
AIP Advances
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2020
·Vol. 10
·期 11
·
IF 1.337
Shi Dekun,Jia Guozhi,Yao Jianghong
Precious metal nanoparticle composite two-dimensional materials have attracted widespread attention due to their excellent photothermal properties. A new method for selective modification of silver nanoparticles on atomic layered molybdenum disulfide (MoS 2 ) is presented. An Ag/MoS 2 composite structure is formed under the continuous irradiation of an 808 nm laser. The heat generated by the photothermal conversion of the MoS 2 nanosheets plays a major role in the growth of silver nanoparticles. The Ag/MoS 2 composite structure is analyzed via the combination of the absorption spectrum, scanning electron microscopy, particle size distribution, and Raman spectroscopy. The photothermal conversion can drive nanometer composite heterogeneous material growth.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Nanoscale Advances
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2021
·
IF 4.553
Qilan Xu,Yuhui Liu,Ling Cai,Yue Cao,Feng Chen,Liuzhu Zhou,Ping Zhu,Huijun Jiang,Qiao-Yan Jiang,Yang Sun,Jin Chen
To tackle the devastating microbial infections for the public health, a continuous search for effective and safe nanobiocides based on their prominent nanoscale effects has been extensively explored during past decades. In this study, a green electrolysis method was employed to synthesize silver-doped molybdenum sulfide (Ag@MoS 2 ) composite materials. The obtained nanocomposites exhibited a sheet-like structure with a large specific surface area, which contributed to the efficient loading and refined distribution of silver nanoparticles. G − E. coli and G + S. aureus were used as model bacteria for the antibacterial test, which revealed enhanced antibacterial activity of produced nanocomposites with an identified destructive effect on preformed biofilms. It was found that within 72 hour incubation, 20 μg mL −1 Ag@MoS 2 was sufficient to inhibit the growth of E. coli and S. aureus without visible colony formation, pointing to a desirable long-term antibacterial activity. Further a mechanistic antibiosis study of Ag@MoS 2 indicated the involvement of a generation of reactive oxygen species. Notably, owing to the well-distributed silver nanoparticles on the nontoxic MoS 2 nanosheet, the cytotoxicity evaluation results revealed that produced nanocomposites exhibited negligible toxicity to mammalian cells, and thereby held promising potential for biomedical applications.
研究领域:
材料科学
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纳米技术
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生物医学工程
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微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Minghui Xiao,Yan Lin,LiangHui Mei,Jian Liu,Fangbin Wang
Although considerable efforts have been devoted to this endeavor, bacterial infections and contamination of medical device surfaces and biointerfaces remain a challenge. Herein, we constructed an Ag/MoS2 nanozyme-modified hydrogel (Ag-HG) dressing with enhanced adhesion and self-healing. Ag-HG showed remarkable antibacterial effects against E. coli and Staphylococcus aureus. The Ag-HG dressing exhibited antibacterial properties with antibacterial efficacies of 72.6% and 72.7% against E. coli and Staphylococcus aureus, respectively. Moreover, this dressing disabled bacteria more efficiently with the assistance of H2O2, reaching antibacterial efficacies of 99.99% and 99.92%, respectively. Multiple modes of antimicrobial action appeared to act synergistically to inhibit microbial growth in the hydrogel dressing. Ag-HG generated reactive oxygen species to damage bacteria and trapped and confined them owing to its porous structure. The synergistic antibacterial effect of the two aspects enhanced the sterilization performance. In vivo experiments showed that the Ag-HG dressing could effectively treat skin surface wounds and accelerate wound healing. The biocompatibility of the Ag-HG dressing was verified using hematoxylin and eosin (H&E) staining. In summary, adhesion-enhanced self-healing nanozyme-modified hydrogel dressing with synergistically antibacterial activity is a promising candidate for applications that require biocompatible and antimicrobial surfaces.
研究领域:
生物医学工程
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材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Liu Hong,Jingze Li,Fangge Liu,Siyu Huang,Bowen Zheng,Xiaoming Ma,Qiang Zhang,Bingtian Zhao,Cheng Yang
Silver (Ag) has been regarded as a significant antioxidant widely used in biosystem. Nevertheless, the loading level of Ag nanospecies needs to be controlled to prevent their potential risk to human health. Herein, nanocomposite consisting of Ag and molybdenum disulfide (MoS 2 ) has been readily synthesized via a template solvothermal method. Characterized by SEM, TEM and EDX, the Ag@MoS 2 composite morphology including nanoflower , hollow sphere and solid sphere could be well controlled by adjusting solvent type and precursor-template ratio during the synthesis process. The composite structure of all three morphologies was further confirmed by XRD, Raman and N 2 adsorption-desorption measurements. Ag@MoS 2 nanoflower and hollow sphere , in which nanosized Ag was anchored (or encapsulated) within MoS 2 nanosheets, obviously boosted the radical (1,1-diphenyl-2-picyrl, DPPH and nitride oxide, NO) scavenging efficiency (minimum IC 50,DPPH = 26 μg/mL while IC 50,NO = 46 μg/mL) with an Ag dosage much lowered to merely 7∼20 μg/mL. As a contrast, weaker activity of radical scavenging could be observed for Ag@MoS 2 solid sphere . Our work will shed new lights on the cost-effective strategy to obtain a biosafe antioxidant.
研究领域:
材料科学
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生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Fang Yan,Rong Deng,Shaohui Guo,Xiaochun Li
Excessive pesticide residues have posed a severe risk to human health and ecological environment, making stringent testing of them a crucial step in food safety supervision. Herein, a flexible paper-based SERS platform composited of AgNPs and MoS 2 nanoflowers was developed for the rapid and ultra-sensitive detection of thiram in juice. Among it, the hydrophobic MoS 2 -modified paper was first fabricated, followed by co-depositing small-sized AgNPs and thiram molecules onto its surface for SERS analysis. Owing to the unique petal-like structure and high hydrophobicity of MoS 2 -coated paper, the AgNPs loaded on it was significantly aggregated, thereby generating numerous “hot spots” in the nanogaps between adjacent silver nanoparticles. Simultaneously, thiram molecules were enriched and concentrated within these gaps, resulting in exceptional Raman signal amplification. Compared to single-material substrates, an integrated advantage was acquired with hybridizing of AgNPs and MoS 2 . The performance of this platform was verified by detecting thiram in pear juice using a portable Raman spectrometer, in which the limit of detection (LOD) can be as low as 1.01 ng/mL and its recovery percentages had a good consistency with ones of HPLC-MS/MS. Overall, this Ag/MoS 2 hybrid SERS platform exhibits outstanding stability, sensitivity and feasibility in the label-free detection of pesticides in food. It also provided a universal tool for the on-site monitoring of diverse biochemical molecules across various fields.
研究领域:
分析化学
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纳米技术
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食品安全
·
光谱学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）