SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Na Xiao,Jiang Xue Dong,Shi Gang Liu,Na Li,Yu Zhu Fan,Yan Jun Ju,Nian Bing Li,Hong Qun Luo
Selective and sensitive detection of multiple metal ions is significant for biological researches and environmental monitoring, because the abnormal metal ions levels have potential damage to the human body and environment. In this study, a fluorescent sensing platform based on Ag nanoclusters has been established for independent detection of Hg 2+ , Cu 2+ , and Fe 3+ ions in a solution. The interference of the fluorescence induced by coexistent metal ions was removed by altering buffers with different pH and using different masking agents. Moreover, the detection mechanism is discussed in detail, which provides a valuable reference for the detection of heavy metal ions with metal nanomaterials. This sensor exhibits a high selectivity and sensitivity, and the linear ranges for Hg 2+ , Cu 2+ , and Fe 3+ detection are 0.05-9, 0.05-18, and 0.1–18 μM with the corresponding detection limits of 12, 27, and 50 nM, respectively. Furthermore, this method was successfully used for analyzing the three metal ions in environmental and biological samples.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yan Wang,Shengzhe Zhao,Yi Yang,Raul D. Rodriguez,Anya Lipovka,Yun Lu,Honglan Huang,Jinju Chen
Ag nanoparticle-decorated Bi 2 O 3 -TiO 2 heterogeneous photocatalysts were successfully obtained by combining facile sacrificial templates and photoreduction . The as-synthesized Ag@Bi 2 O 3 -TiO 2 photocatalysts with a narrow band gap of 2.40 eV exhibited considerable photocatalytic activity to degrade rhodamine B (RhB) and tetracycline hydrochloride (TCH), and the removal efficiency reached 100% and 92%, respectively. Ag@Bi 2 O 3 -TiO 2 photocatalysts also exhibited stable recyclability for the degradation of RhB and TCH. Trapping experiments helped determine the major reactive oxidative species for TCH photodegradation . The desirable photodegradation performance is mainly attributed to improved light absorption , enhanced charge separation, and strong redox capacity of Ag@Bi 2 O 3 -TiO 2 nanostructures with S-scheme heterojunction . This work provides a facile avenue to construct heterogeneous tubular nanostructures with intensive photoabsorbance and effective photocatalysis to degrade organic contaminants.
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APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Yongqian Lei,Guanhua Wang,Pengran Guo,Huacan Song
A series of Ag-loaded photocatalysts of Ag–BiOBr x I 1− x have been synthesized by a solution method and characterized by variety methods. The degradation of rhodamine B (RhB) showed that these samples exhibited excellent and composition-dependent performance in the visible light region. The Ag–BiOBr 0.75 I 0.25 composite photocatalyst shows the highest photocatalytic activity in the degradation of RhB and 4-CP pollution. The load of metal Ag has remarkably improved the photocatalytic activity. The significant enhancement in the Ag–BiOXs photoactivity could be both the effect of Ag deposits as electron traps and the surface plasma resonance absorption effect of Ag. A possible mechanism of enhanced activity of Ag–BiOXs was proposed based on the analysis of the band gap structure.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Zhichao Shang,Zhongxiang Yang,Yang Xiao,Xiaohong Wang
The various ordered mesoporous Ag/CeO 2 catalysts were successfully prepared using a facile silica-templated solution combustion synthesis method (TSCS). Utilizing X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), Brunauer-Emmett-Teller (BET), photoluminescence (PL) and UV–vis diffuse reflectance spectrometry (DRS), etc., the morphological, structural, crystalline, surface and optical properties of Ag/CeO 2 were investigated. It was found that the removal of the template (SiO 2 ) resulted in the formation of ultrafine mesoporous Ag/CeO 2 composites, and the specific surface area increased to 98.6 m 2 /g. The 15 % Ag/CeO 2 composite showed the best photocatalytic performance (97 % at 120 min), which was approximately 10 times higher as compared to the conventional SCS (Solution Combustion Synthesized) CeO 2 . In addition, a mechanism of the photocatalytic degradation of Rhodamine B (RhB) was proposed, where the reactive species ·O 2 − and h + played important roles in the degradation of pollutants.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
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2017
·Vol. 28
·期 1
·1-8
·
IF 2.325
Wang Shilei,Wu Jie,Yang Hao,Liu Xiangyu,Huang Qiaomu,Lu Zhong
Dental caries is a widespread disease mainly caused by the anaerobic oral pathogen Streptococcus mutans ( S. mutans ). Ag/ZnO nanocomposite is an efficient antibacterial agent because of its high antibacterial activity and low cytotoxicity. In this study, rod-like Ag/ZnO nanocomposite was synthesized through a deposition-precipitation method and characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The activity of Ag/ZnO nanocomposite against S. mutans was evaluated by determining the minimal inhibitory concentration, minimum bactericidal concentration and growth inhibition curve. The results showed that Ag/ZnO nanocomposite displayed higher activity against S. mutans compared with pure ZnO nanorods. Moreover, the antibacterial mechanism was investigated by determining the bacterial membrane potential, release of K + , intracellular reactive oxygen generation and lipid peroxidation. Disruption of membrane function and oxidation of biomacromolecules played important role in the antibacterial action of Ag/ZnO nanocomposite. This work proposes a potentially effective dental antibacterial agent against the dental caries-causing S. mutans .
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PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 66
·37729-37734
·
IF 2.936
Xiaofeng Lin,Wensheng Lin,Meijia Yang,Jiayao Chen,Dingshan Yu,Wei Hong,Xudong Chen
The chain reaction amplification mechanism (CRAM) has been extensively studied, but it has not been effectively developed at the molecular scale and still needs to consume amounts of monomers to show the macroscopic phenomenon needed for detection. Herein, rationally-designed silica-coated silver nanoparticles with acrylic acid-functionalization were used as a plasmonic nanosensor to realize highly sensitive and fast colorimetric glucose detection with less monomer consumption, which effectively integrated CRAM with the localized surface plasmon resonance effect, developing CRAM at the molecular scale. The glucose detection mechanism of the proposed sensor was based on free-radical polymerization by biocatalytic initiation, which would induce the aggregation of Ag NPs, leading to a decrease in the plasmon resonance intensity. As a result, the detection limit could reach 2.06 × 10−5 M, 10 times lower than that of a commercial glucose assay kit with a limit of 1.1 × 10−4 M. Moreover, FDTD simulation further confirmed that the intensity of the extinction gradually decreased with an increase in the degree of aggregation of Ag NPs. The approach could be used for high selectivity toward glucose detection and would be suitable for other practical applications of the detection of low concentrations of glucose.
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PubMed
高影响因子
JOURNAL OF BIOMATERIALS APPLICATIONS
·
2023
·
IF 2.9
Chen Chen,Maomei Xie,Yueling Yan,Yongyuan Li,Zhiyao Li,Tong Zhang,Zanyan Gao,Liyi Deng,Haixia Wang
In recent years, Ag nanoparticle (Ag NP)-loaded antibacterial dressings have attracted much attention in high-level medical dressings. However, the high cytotoxicity of Ag NP has always been a problem. In this paper, we examined the improvement of antibacterial activity of berberine hydrochloride (BBR) with Ag NP, the results showed that the combined use of BBR and Ag NP can effectively reduce the dosage of Ag NP while ensuring the inhibition of bacterial growth, thus an intermediate layer dressing containing combined drugs were prepared. At the same time, the top dressing of polyvinyl alcohol (PVA) solid film and the PVA bottom dressings with three kinds of leakage structures were prepared by 3D printing technology. Three kinds of PVA bottom dressings showed high quality consistency, and the greater the number of leak holes, the higher the porosity value of the dressing, while the swelling ratio value of the bottom layer dressing with three holes was the lowest. Finally, three types of BBR-Ag NP composite antibacterial dressings (3D-BBR-Ag NP) can be obtained by self-assembling of the top dressing, the intermediate layer dressing, and the bottom dressings with three kinds of leakage structures. The cumulative drug release results showed that dressing with more holes had a faster drug release rate compared to the other two ones with fewer leakage holes. Besides, five drug release kinetic models were used to investigate the cumulative BBR release profiles for three types of 3D-BBR-Ag NP. And the three types of composite dressings showed strong antibacterial activity after 6 h of cultivation with staphylococcus aureus. The study showed that the antibacterial activity of the self-assembled dressing prepared by combination of BBR with Ag NP can be improved, and the drug release rate of the hydrogel dressing can be flexibly controlled through 3D printing technology.
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PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2021
·Vol. 15
·期 4
·892-901
·
IF 4.204
Wang Yixing,Dai Liheng,Qu Kai,Qin Lu,Zhuang Linzhou,Yang Hu,Xu Zhi
Photocatalytic membranes have received increasing attention due to their excellent separation and photodegradation of organic contaminants in wastewater. Herein, we bound Ag-AgBr nanoparticles onto a synthesized polyacrylonitrile-ethanolamine (PAN-ETA) membrane with the aid of a chitosan (CS)-TiO 2 layer via vacuum filtration and in-situ partial reduction. The introduction of the CS-TiO 2 layer improved surface hydrophilicity and provided attachment sites for the Ag-AgBr nanoparticles. The PAN-ETA/CS-TiO 2 /Ag-AgBr photocatalytic membranes showed a relatively high water permeation flux (~ 47 L·m −2 ·h −1 ·bar −1 ) and dyes rejection (methyl orange: 88.22%; congo red: 95%; methyl blue: 97.41%; rose bengal: 99.98%). Additionally, the composite membranes exhibited potential long-term stability for dye/salt separation (dye rejection: ~97%; salt rejection: ~6.5%). Moreover, the methylene blue and rhodamine B solutions (20 mL, 10 mg · L −1 ) were degraded approximately 90.75% and 96.81% in batch mode via the synthesized photocatalytic membranes under visible light irradiation for 30 min. This study provides a feasible method for the combination of polymeric membranes and inorganic catalytic materials.
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高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2021
·Vol. 36
·期 3
·303-310
·
IF 0.957
Dai Jinhang,Meng Shunliang,Yang Chuntian,Lü Wenzhong,Chen Xizi,Yin Yuhao,Liang Fei
To get a dielectric material with a high dielectric permittivity and suppressed dielectric loss, nano-Ag with a particle size of 20 nm and Ag@TiO 2 core-shell particles with diameters of approximately 70–120 nm were embedded in polyvinylidene fluoride (PVDF) to fabricate nano-Ag/Ag@TiO 2 /PVDF composites. After being modified by nano-Ag with 3 vol% optimal amount, the relative permittivity ( ε r ) at 100 Hz of 50 vol% Ag@TiO 2 /PVDF composites was 61, and the dielectric loss can be suppressed to 0.04, almost 96.4% lower than that of unmodified composites, and a higher frequency stability of both ε r and loss has also been found. The underlying mechanism of the reduced loss was attributed to Maxwell-Wagner polarization and the Coulomb blockade effect caused by the introduction of a small amount of nano-Ag, which will block the movement of electrons between metal nanoparticles and composites. The space charge polarization and conductance loss are weakened at lower and higher Ag@TiO 2 filling ratios, respectively, thus leading to a very low loss of the composites.
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RSC Advances
·
2016
·Vol. 6
·期 41
·35001-35007
·
IF 3.289
Xuehong Zhang,Min Wei,Bingjing Lv,Yuanjian Liu,Xu Liu,Wei Wei
Glucose and cholesterol in human fluids are clinically important analytes and their sensitive detection is significant in diagnosis. In this study, Au@Ag core–shell nanoparticles (Au@Ag NPs) prepared by in situ growth of silver nanoparticles (AgNPs) on the surface of thiol-PEG-capped gold nanoparticles (AuNPs, 13 nm) have been successfully applied to fabricate a colorimetric biosensing platform for glucose and cholesterol. Au@Ag NPs showed an obvious absorbance peak at 375 nm due to the surface plasmon resonance (SPR) absorption of AgNPs. In the presence of cholesterol and glucose, H2O2 was produced under the catalytic action of their corresponding enzymes such as glucose oxidase (GOx) or cholesterol oxidase (ChOx), which etched the AgNPs shell of Au@Ag NPs. As a result, their characteristic absorbance at 375 nm decreased, accompanied with a perceptible color change from orange to red, which could be used to detect glucose and cholesterol by the naked eye. Under optimum conditions, the linear ranges for the detection of glucose and cholesterol by UV-vis spectroscopy were from 0.5 to 400 μM and 0.3 to 300 μM, respectively. The detection limit of the biosensors for glucose and cholesterol were 0.24 μM and 0.15 μM, respectively. The practical applications of this method in urine or human serum have been realized with satisfactory results. This work provides a simple and sensitive approach for glucose and cholesterol detection, which has broad application prospects in clinical diagnosis.
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高影响因子
Russian Journal of Physical Chemistry A
·
2022
·Vol. 96
·期 10
·2182-2188
·
IF 0.791
Khan Misbah Ullah,Ullah Hayat,Honey Shehla,Manan Abdul,Sarfaraz Maliha,Ullah Shaheed,Ullah Munzer,Gul Zarif
Abstract Efficient bimetallic nanostructures, which show properties related to two sole metals, have empowered inventive applications in nanosciences and nanotechnology. Here, we construct bimetallic Au@Ag nano-urchins with controlled Au tips for Catalysis and SERS application. The proposed nano-urchins were synthesized via electrochemical and simple galvanic replacement reaction route. The construction of Ag nano-flowers via electrochemical deposition use as a shell and Au tips were grown via galvanic reaction route greatly enhanced SERS properties of crystal violet (CV) detection and stability of nanostructures. In a comparison of Ag flower-like structures, the catalysis properties of Au@Ag nano-urchins are extremely efficient in degrading p -nitrophenol. As a result, these bimetallic nano-urchins show great development in SERS substrate and efficient catalysts.
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高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Ziyuan Jiang,Jiaqi Pan,Beibei Wang,Chaorong Li
The two dimensional(2D) Z-scheme AgCl/Ag/Ca/TiO 3 nano-heterojunction is synthesized via simple preparation of hydrothermal-chemical co-deposition method. The results of SEM, EDS, elemental mapping, XRD, TEM, XPS and Raman shift imply that the AgCl/Ag nanoparticles have deposited on the surfaces of CaTiO 3 nanosheets successfully. Compared with the unmodified samples, the photocatalytic activity of the as-prepared 2D AgCl/Ag/CaTiO 3 nano-heterojunction exhibits a remarkable enhancement by the hydrogen production. Further, the photocatalytic process has been studied and the mechanism of the photocatalytic hydrogen production enhancement has been provided, which could be ascribed to the Z-scheme heterojunction and 2D lamellar structure of the CaTiO 3 .
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