APPLIED SURFACE SCIENCE
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2015
·
IF 2.711
Zhengyi Zhang,Jiajie Yu,Jingying Yang,Xiang Lv,Tianhe Wang
Porous Ag/TiO 2 composite films were prepared by spin coating of titania on normal glass slides and subsequent photochemical deposition of silver nanoparticles (AgNPs). The films were characterized by XRD and FESEM to reveal micro structural and morphological differences between films obtained under varied conditions. The SERS properties of these films were investigated using aqueous crystal violet (CV) as probe molecules. The results indicate that the content of polyethylene glycol (PEG) and photo-reduction time had significant influences on both the microstructure and SERS performance of Ag/TiO 2 films. The highest SERS sensitivity that allowed as low as 10 −10 M aqueous CV to be detected, was achieved with the PEG/(C 4 H 9 O) 4 Ti molar ratio being 0.08% and with 30 min of UV irradiation. With this film a linear relationship was established through experiment between SERS intensity and CV concentration from 10 −10 to 10 −5 M, which could be used as a calibration curve for CV concentration measurement. In addition, the film could be reused as a SERS substrate for up to four times without significantly losing SERS sensitivity if a simple regeneration was followed. It is visualized that the Ag/TiO 2 film on glass has potentials for being developed into a practical SERS substrate with high sensitivity and good reusability.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
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IF 5.401
Yao Yao,Mingli Yin,Junqing Yan,Dong Yang,Shengzhong (Frank) Liu
Ag-WO 3 core-shell nanospheres (CSNSs) are fabricated for gas sensor applications. It is found that the sensor based on Ag-WO 3 CSNSs dramatically improve the sensor performance towards alcohol vapor, with significantly lower optimum working temperature (260 °C) and superior detection limit (0.20 ppm) comparing to pure WO 3 hollow nanospheres (HNSs). The Ag-WO 3 sensor displays an ultrahigh sensitivity under visible light illumination. When illuminated under a 150 W xenon arc light source, the response is increased from 62 to 160, the optimum working temperature is reduced from 260 to 190 °C, and the detection limit is improved from 0.20 to 0.032 ppm. This work may offer an attractive strategy to improve sensitivity of light-enhanced plasmonic metal-oxide based gas sensors.
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CHEMICAL PAPERS
·
2024
·
IF 2.1
Wei Zijie,Jiang Cuifeng,Chen Xinyan,Li Hui,Song Juan
In this study, Os/Ag nanoparticles (Os/Ag NPs) with smaller K m and almost five times V max compared to Os NPs were prepared. This not only reduced the cost of nanozyme, but also improved the catalytic ability. Addition of L-Cysteine or glutathione (GSH) resulted in inhibitory effect on the peroxidase-like activity of Os/Ag nanozyme. Therefore, the L-Cysteine and GSH could be detected by absorption spectra method with limit of detection (LOD) of 0.22 μM and 0.2 μM, respectively. Moreover, a colorimetric sensing system for L-Cysteine and GSH based on portable paper strip and smartphone was fabricated with LOD of 1.72 μM and 1.4 μM, respectively. Furthermore, this method can be used in fetal bovine serum with recovery rates ranging from 89.42% to 109.0%. The sensing system exhibited good selectivity. This proposed colorimetric sensing assay holds great potential application in the detection of biothiols when no sophisticated equipment are available. Graphical abstract
Scheme illustration for the colorimetric detection of L-Cysteine and GSH by use of smartphone
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Journal of Functional Biomaterials
·
2024
·Vol. 15
·期 6
·152
·
IF 5
Junnan Cui,Haobo Shu,Panpan Zhu,Zhimin Cao,Shuilin Wang,Pan Cao
Silver nanoparticles (AgNPs) are known for their antibacterial properties and their ability to promote wound healing. By incorporating silver nanoparticles into medical gauze, the resulting composite material shows promise as an advanced wound dressing. However, clinical applications are hindered by challenges related to the stability of silver nanoparticle loading on the gauze as nanoparticle leaching can compromise antibacterial efficacy. In this study, silver nanoparticles were immobilized onto polydopamine (PDA) submicron particles, which were then used to modify medical gauze. Energy dispersive spectroscopy (EDS) was employed to analyze the elemental distribution on the modified gauze, confirming successful surface modification. The antibacterial properties of the modified gauze were assessed using a laser scanning confocal microscope (CLSM). The results demonstrated a significant reduction in the adhesion rates ofEscherichia coli(E. coli) andStaphylococcus aureus(S. aureus) by 99.1% and 63%, respectively, on the PDA–Ag-modified gauze. Optical density (OD) measurements at 590 nm indicated that the modified gauze effectively inhibited biofilm formation, underscoring its potent antimicrobial capabilities. Further antibacterial efficacy was evaluated by diluting and plating co-cultured bacterial solutions with the modified dressing, followed by 24 h incubation and colony counting. The gauze exhibited an antibacterial efficiency of 99.99% againstE. coliand 99.8% againstS. aureus. Additionally, cell compatibility tests, involving the co-culture of PDA–Ag composites with human cells, demonstrated excellent biocompatibility. These findings suggest that PDA–Ag-modified medical gauze holds significant potential for the treatment of infected wounds, offering a promising solution to improve wound care through enhanced antimicrobial activity and biocompatibility.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Rui Zhai,Zhenyu Wang,Mengyue Gu,Haoliang Liu,Xuewen Zhao,Jiangfan Li,Yaqiong Su,Yonghong Cheng,Shaobin Wang,Jinying Zhang
Selective photoreduction of CO 2 into ethylene is desirable but stays challenging due to easy desorption of primary reduction product CO. Herein, violet phosphorene nanosheets (VPNS) are for the first time demonstrated to be effective CO 2 photoreduction catalysts to yield ethylene. Photoelectron was found to transfer from VPNS to co-catalyst Ag and aggregated on VPNS-Ag interface to enhance CO 2 and CO* adsorption, and further lower the reduction energy barrier to yield ethylene, which was confirmed by in-situ diffuse reflectance infrared Fourier-transform, CO stripping voltammetry, CO reduction experiments, and density functional theory calculations. CO 2 is reduced into COOH* and automatically transformed into CO* on VPNS-Ag surface, then protonized into CHO* with a low barrier of 0.64 eV and automatically coupled into COCHO* to yield ethylene. Only ethylene was detected from CO 2 photoreduction with a yield of 10.34 μmol g −1 h −1 without any hole-sacrificial agent, much higher than most reported photocatalysts.
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PHYSICA SCRIPTA
·
2024
·Vol. 99
·期 11
·115918
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IF 2.6
Shengkai Liu,Cheng Chang,Boyu Chen,Han Song,Jiashen Fan,Yujie Fu,Zhiguo Liu
In this study, catechin-functionalized Fe3O4-Ag nanocomposites were synthesized by a hydrothermal method. The motivation for this study was to develop a novel antibacterial agent with enhanced stability and biocompatibility. The objective was to create a nanocomposite combining the antimicrobial properties of silver with the antioxidant and bioactive characteristics of catechin. We hypothesized that the synergistic effect of catechin and Fe3O4-Ag would yield a highly effective antibacterial material against common pathogens. The obtained nanocomposites were characterized by TEM, SEM, AFM, XPS, XRD, FTIR and physical property measurement system (PPMS). TEM images indicated that catechin-functionalized Fe3O4-Ag nanocomposites have a spherical morphology with an average size of 25.7 nm. The SEM and AFM imaging revealed that the nanocomposites appear as a number of large particles with average diameter of 581 nm. XPS and XRD and FTIR measurement confirmed the presence of catechin components, Fe3O4 and Ag in the nanocomposites. Taken together, we conclude that the catechin-Fe3O4-Ag nanocomposites in this study have a jujube cake structure in which the Fe3O4-Ag alloy nanoparticles serve as the jujube and the condensed catechin form into the cake substrate. The antimicrobial test indicated the catechin-functionalized Fe3O4-Ag nanocomposites have obvious inhibitory effects on E.coli, S.aureus, and C.albicans.
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Materials
·
2024
·Vol. 17
·期 6
·1312
·
IF 3.1
Yanqiu Feng,Henghui Qu,Yanxiang Wang,Lanzhong Wang,Yongbo Wang,Deli Yang,Bohan Ding,Yue Sun,Jinghe Guo,Shichao Dai
Based on MnO2/carbon cloth (CC) composite materials, an Ag-doped MnO2nanowire, self-assembled, urchin-like structure was synthesized in situ on the surface of CC using a simple method, and a novel and efficient flexible electrode material for supercapacitors was developed. The morphology, structure, elemental distribution, and pore distribution of the material were analyzed using SEM, TEM, XRD, XPS, and BET. The electrochemical performance was tested using cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD). In the three-electrode system, GCD testing showed that the specific capacitance of the material reached 520.8 F/g at 0.5 A/g. After 2000 cycles at a current density of 1 A/g, the capacitance retention rate was 90.6%, demonstrating its enormous potential in the application of supercapacitor electrode materials.
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Polymers
·
2024
·Vol. 16
·期 8
·1173
·
IF 4.7
Yunkai Wang,Danlei Jing,Zikai Xiong,Yongqing Hu,Wei Li,Haotian Wu,Chuan Zuo
With the development of microelectronics products with high density and high power, it is urgent to improve the electrical and thermal conductivity of electronic paste to achieve the new requirements of packaging materials. In this work, a new synthesis method of Ag-MWCNTs was designed: Firstly, carboxylated MWCNTs and stannous chloride were used as raw materials to prepare high-loading-rate Sn-MWCNT composite material to ensure the high loading rate of metal on the MWCNT surface. Then, Ag-MWCNT composite material was prepared by the chemical displacement method to solve the problem of the low loading rate of silver nanoparticles on the MWCNT surface. On the basis of this innovation, we analyzed and compared the electrical, thermal, and mechanical properties of Ag-MWCNT composite electronic paste. Compared with the electronic paste without adding Ag-MWCNTs, the resistivity was reduced by 77%, the thermal conductivity was increased by 66%, and the shear strength was increased by 15%. Therefore, the addition of Ag-MWCNTs effectively improves the electrical, thermal, and mechanical properties of the paste, making it a promising and competitive choice for new packaging materials in the future.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Huanliang Liu,Wenqing Lai,Yue Shi,Lei Tian,Kang Li,Liping Bian,Zhuge Xi,Bencheng Lin
Bacteria in air harm the human body. Therefore, developing novel materials capable of simultaneously filtering and terminating bacteria is highly desirable. However, the filtration and inhibition performance of existing filters remain far from optimal. In this study, we combine the electrospinning technique with an in situ reduction approach to fabricate electrospun composite fibrous membranes for simultaneous bacterial filtration and termination. The results show that composite membranes with a homogenously fibrous morphology are successfully prepared. Furthermore, the dual antibacterial agents silver nanoparticles (Ag) and graphene oxide nanosheets (GO) are uniformly encapsulated within the fibers. The tensile strength and elastic modulus of the electrospun composite membranes reach 1.04 and 10.23 MPa, respectively. In addition, the results show that the composite membranes exhibit excellent interception efficiency of over 99.9 % against the gram-positive bacteria S. aureus . The electrospun composite membranes also exhibit high antibacterial activity against E. coli , S. aureus , K. pneumoniae , C. albicans , and B. subtilis, achieving antibacterial efficiency of over 99.99 %. Electrospun composite membranes with bacterial filtration and termination properties may have great potential for use in personal protective equipment and indoor and outdoor air purification.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Yang Yang,Mengyao Tan,Xiaoman Li,Min Luo
The photocatalytic nitrogen reduction reaction provides an alternative process for nitrogen cycling and ammonia (NH3) production under mild conditions. Herein, we have synthesized Ag-loaded In2O3 (Ag@In2O3-X) by solvothermal and photoreduction methods. The introduction of Ag significantly alters the band structure of In2O3, resulting in a slight reduction in the band gap and a more negative conduction band position, thereby facilitating the generation of reductive electrons in In2O3. Moreover, the synergistic interaction between loaded Ag nanoparticles and In2O3 forms a Schottky barrier, which widens the light absorption range and promotes charge separation. Under simulated sunlight, the photocatalytic nitrogen fixation performance of Ag@In2O3-5 reaches 35.56 μmol h−1 gcat−1, which is higher than other composites and 3.58 times that of pure In2O3. At the same time, the catalyst has good structural stability and cycle life. Density functional theory (DFT) calculations demonstrate that Ag exhibits a stronger interaction with N2 and lowers the potential barrier of the N2 hydrogenation reaction. The synergistic effect between precious metals and semiconductors offers novel insights and presents challenges for the photocatalytic N2 fixation process. This work provides new insights and challenges for designing and synthesizing nanomaterials for photocatalytic nitrogen fixation.
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BIOSENSORS & BIOELECTRONICS
·
2024
·
IF 10.7
Lin Fan,Lijun Kong,Hao Liu,Jiawei Zhang,Mengdi Hu,Li Fan,Hongliang Zhu,Shancheng Yan
Ag and Cu based nanostructures serve as advanced functional materials for biomedical applications , due to their unique properties. Here, we proposed a novel neurotransmitter biosensing method based on Ag–Cu composite nanozyme , synthesized through the soft film plate method. Supported by the soft film template , the Ag–Cu nanozymes were stably kept to an ultrafine 2D structure with high monodispersity, which provided a large specific surface area and sufficient binding sites , leading to controllable and improved dual-nanozyme activities over similar-sized mono-Ag and mono-Cu, and up to 4.95 times of natural enzyme-level. The multi-path enzymatic reaction processes catalyzed by Ag–Cu composite nanozymes were firstly theoretically discussed in detail, according to the theoretical redox potential of redox couples in the reaction systems. On this basis, the Ag–Cu filled nanonets based neurotransmitter biosensing is successfully applied in rapid detection for glutathione and dopamine, possessing a linear range of 10∼100 μM and 1–10 μM, and a detection limit of 3.01 μM and 0.29 μM, respectively, which exhibited superior performance for biomedical purposes over most commercially available products in speed and precision.
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Nanomaterials
·
2024
·Vol. 14
·期 10
·848
·
IF 4.4
Jun Wu,Gaofeng Shao,Xiaodong Wu,Sheng Cui,Xiaodong Shen
A novel Cr-doped BaTiO3aerogel was successfully synthesized using a co-gelation technique that involves two metallic alkoxides and a supercritical drying method. This freshly prepared aerogel has a high specific surface area of over 100 m2/g and exhibits improved responsiveness to the simulated sunlight spectrum. Methyl orange (MO) was chosen as the simulated pollutant, and the results reveal that the Cr-doped BaTiO3aerogel, when modified with the noble metal silver (Ag), achieves a pollutant removal rate approximately 3.2 times higher than that of the commercially available P25, reaching up to 92% within 60 min. The excellent photocatalytic performance of the Ag-modified Cr-doped BaTiO3aerogel can be primarily attributed to its extensive specific surface area and three-dimensional porous architecture. Furthermore, the incorporation of Ag nanoparticles effectively suppresses the recombination of photo-generated electrons and holes. Stability and reusability tests have confirmed the reliability of the Ag-modified Cr-doped BaTiO3aerogel. Therefore, this material emerges as a highly promising candidate for the treatment of textile wastewater.
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