TALANTA
·
2026
·
IF 6.7
Feier Jiang,Dongmei Liu,Guang Yang,Miaomiao Hu,Cheng Ye,Xu Sun,Hui Sun,Maofeng Zhang
An ordered PMMA@Ti 3 C 2 T x -Ag composite array SERS substrate was fabricated using PMMA microsphere templates and in-situ AgNP immobilization. • Synergistic electromagnetic and chemical enhancement generated abundant hotspots and excellent SERS uniformity (RSD < 5%). • Ultrasensitive detection was achieved for CV and 4-ATP down to 10 −9 M, and for diquat/triazophos and thiram down to 10 −8 and 10 −7 M, respectively. • The platform enabled simultaneous pesticide identification and in-situ residue analysis on blueberry and cherry tomato surfaces below EU maximum residue limits. The rapid identification and quantitative detection of pesticides on a portable device is of vital importance for food safety evaluation and human health protection. However, conventional strategies for realizing the reliable, portable and sensitive detection of target analytes are still challenging. In this work, the ordered polymethyl methacrylate (PMMA) microspheres array were employed as template to fabricate PMMA@Ti 3 C 2 T x . Silver nanoparticles (AgNPs) were then uniformly immobilized onto the composite substrate through an in-situ route, generating abundant electromagnetic hotspots. Benefiting from the synergistic electromagnetic and chemical enhancement, a high-performance PMMA@Ti 3 C 2 T x -Ag composite array SERS substrate was successfully fabricated. The prepared array substrate exhibits excellent SERS performance with good uniformity (relative standard deviation, RSD < 5%) and satisfactory stability. It achieves the detection concentration of 10 −9 M for probe molecules of crystal violet (CV) and 4-aminothiophenol (4-ATP). For pesticide detection using standard solutions, the substrate realizes trace detection of diquat and triazophos down to 10 −8 M, while the detection concentration for thiram is 10 −7 M. Taking advantage of the unique molecular fingerprint signature of SERS, the platform enables simultaneous identification of various pesticide molecules. Further practical tests were carried out to perform in-situ analysis of pesticide residues on the surfaces of blueberries and cherry tomatoes. The detectable concentrations of target pesticides are well below the maximum residue limits stipulated by the European Union, demonstrating the great potential of the SERS platform for rapid screening applications in food safety monitoring. These results indicate the promising potential of the sensing platform for rapid on-site monitoring of pesticide residues in complex food matrices. For the spiked fruit-surface experiments, diquat and triazophos were detected down to 10 −7 M, whereas thiram was detected at 10 −6 M. Download: Download high-res image (363KB) Download: Download full-size image
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2022
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IF 4.52
Haishuai Peng,Yuanyuan Hui,Meixue Pu,Ding Yang,Aiqing Zhao,Weizhe Wang,Shan Wu,Bini Wang
Streptomycin (STR) residues in dairy products could cause serious health risks for human or affect the quality of the dairy products fermented by lactic acid bacteria , thereby resulting in economic losses. Thus, STR detection methods need to be developed quickly, simply, and sensitively. In this study, polyethyleneimine (PEI)-functionalized NH 2 -MIL-101(Fe) (PEI-Fe-MOF) was characterized and found to exhibit an enhanced electrochemical characteristics, when compared to Fe-MOFs. [email protected] core-shell NPs could further amplify its electrochemical signal. Based on the PEI-Fe-MOF/ [email protected] NPs nanocomposites, we have developed a novel electrochemical aptasensor to detect STR rapidly. When detected under optimal conditions, a wide linear range between 0.1 and 200 nM was observed for the aptasensor with a detection limit of 0.033 nM. Furthermore, the developed aptasensor has been satisfactorily applied for the rapid STR detection in dairy products with recoveries ranging from 98.2% to 110.1%. Therefore, our method can be considered a new effective method for the rapid detection of STR in dairy products.
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Journal of Central South University
·
2019
·Vol. 26
·期 6
·1443-1448
·
IF 0.973
Tang Yi-qun,Liu Xi,Huang Xiao-bing,Ding Xiang,Zhou Shi-biao,Chen Yuan-dao
Li 2 FeSiO 4 is deemed to be a potential candidate for large-scale applications because of its abundance, low cost and high safety, etc. Unfortunately, its low conductivity, resulting in poor rate performance, has become a main obstacle to its applications in power battery and energy storage system. In this work, C-Ag coated Li 2 FeSiO 4 is introduced to improve the innate electronic conductivity and Li-ion diffusion ability. The results demonstrate that Li 2 FeSiO 4 /C/Ag composite exhibits better electrochemical performance. It possesses a specific discharge capacity of 152, 121, 108 mA∙h/g at 0.2 C , 5 C and 10 C , respectively. At the same time, the Li 2 FeSiO 4 /C/Ag composite shows good cycle stability and a capacity retention ratio of 97.9% after 100 cycles at 1 C .
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Catalysts
·
2021
·Vol. 11
·期 11
·1336
·
IF 4.146
Xiaolong Zhang,Lei Chen,Yang Liu,Qian Duan
Composite nanostructure materials are widely used in catalysis. They exhibit several characteristics, such as the unique structural advantage and the synergism among their components, which significantly enhances their catalytic performance. In this work, CoPt nanoparticles and reduced-graphene-oxide-based nanocomposite catalysts (rGO/CoPt, rGO/CoPt/Ag) were prepared by using a facile co-reduction strategy. The crystalline structure, morphology, composition, and optical characteristics of the CoPt nanoparticles, rGO/CoPt nanocomposite, and rGO/CoPt/Ag nanocomposite catalysts were investigated by a set of techniques. TheID/IGvalue of the rGO/CoPt/Ag nanocomposite is 1.158, higher than that of rGO/CoPt (1.042). The kinetic apparent rate constant, k, of the rGO/CoPt/Ag nanocomposite against 4-nitrophenol (4-NP) reduction is 5.306 min−1, which is higher than that of CoPt (0.495 min−1) and rGO/CoPt (1.283 min−1). The normalized rate constant, knor, of the rGO/CoPt/Ag nanocomposite is 56.76 min−1mg−1, which is higher than some other catalytic materials. The rGO/CoPt/Ag nanocomposite shows a significantly enhanced catalytic performance when compared to CoPt nanoparticles and the rGO/CoPt nanocomposite, which may confirm that the novel rGO/CoPt/Ag nanocomposite is a promising catalyst for the application of catalytic fields.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Yongfang Chen,Bin Gu,Yuqi Li,Dongya Yang,Fengxian Qiu,Tao Zhang
Controllable and reliable fabrication of wearable materials with tunable structures and integrated functionalities is urgently required for personal thermal management. Here, MnO2 nanowires@Ag/cellulose laminated membranes with infrared insulation, antibacterial, and unidirectional liquid penetration properties assembled were fabricated by hydrophobic cellulose, hydrophilic cellulose, and ultralong MnO2 nanowires@Ag in vacuum filtration and magnetron sputtering methods. The results indicated that nanosilver coating with high infrared radiation reflectivity and excellent electrical conductivity was successfully fabricated onto MnO2 nanowire surfaces, resulting in infrared insulation properties of the laminated cellulose membranes. In addition, the laminated membranes exhibit unidirectional liquid penetration properties that can enhance the wearing comfort. In antibacterial tests against Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus, the high antibacterial activity is revealed. These results indicate the promising potential of the laminated cellulose membranes for tackling personal thermal management issues related to wearable applications.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Dong Zhang,Ping Yan,Hong Yu,Jing Sun,Shuyun Zhu,Xian-En Zhao
Development of accurate, convenient and portable methods for monitoring 4-aminophenol (4-AP) is extremely important because of its strong toxicity. Here, a ratiometric fluorescence sensor based on Ag + -enhanced luminescence of Tb-DNA complexes has been presented for the detection of 4-AP. The luminescence of Tb-DNA complexes is enhanced about 30 times by Ag + , which can trigger energy transfer from DNA to Tb 3+ more efficiently. In the presence of 4-AP, Ag + can be reduced into Ag 0 owing to its strong reducibility, inducing the decrease of Tb-DNA complexes at 545 nm remarkably. Besides, 4-AP exhibits intrinsic fluorescence at 375 nm under the same conditions. Therefore, ratiometric detection of 4-AP can be achieved using F 375 /F 545 as readout with a detection limit of 0.4 μM. Real water samples have been tsted to evaluate this method in practical application and satisfactory results have been obtained. Furthermore, the addition of 4-AP into Tb-DNA-Ag + system induces a visible color variation from green to bluish violet, enabling visual detection of 4-AP under the assistance of a smartphone.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Yu Lu,Xiufang Mo,Geng Zhu,Yan Huang,Yingchao Wang,Zhenzhong Yang,Liqiong Gao,Guofang Shen,Yi Wang,Xiangwei Zhao
Practical gas sensing application requires sensors to quantify target analytes with high sensitivity and reproducibility. However, conventional surface enhanced Raman scattering (SERS) sensor lacks reproducibility and quantification arising from variations of "hot spot" distribution and measurement conditions. Here, a ratio-dependent SERS sensor was developed for quantitative label-free gas sensing. Au@Ag-Au nanoparticles (NPs) were filtered onto anodic aluminum oxide (AAO) forming Au@Ag-Au@AAO SERS substrate. 4-MBA was encapsulated in the gap of Au@Ag-Au and served as the internal standard (IS) to calibrate SERS signal fluctuation for improved quantification ability. Combined with headspace sampling method, SO 2 residue in traditional Chinese medicine (TCM) can be extracted and captured on the immediate vicinity of Au@Ag-Au surface. The intensity ratio I 613 cm −1 /I 1078 cm −1 showed excellent linearity within the range of 0.5 mg/kg-500 mg/kg, demonstrating superior quantification performance for SO 2 detection. Signals for concentration as low as 0.05 mg/kg of SO 2 could be effectively collected, much lower than the strictest limit 10 mg/kg in Chinese Pharmacopoeia. Combined with a handheld Raman spectrometer, handy and quantitative TCM quality evaluation in aspect of SO 2 residue was realized. This ratiometric SERS sensor functioned well in rapid on-site SO 2 quantification, exhibiting excellent sensitivity and simple operability.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Huanyu Zhuang,Xiaoyu Li,Xin Du
Bacterial infections represent one of the foremost threats to global human health. Furthermore, the misuse of antibiotics has exacerbated the public health crisis. Therefore, the development of high-performance novel antibacterial materials is of utmost importance. However, there are still several issues regarding the antibacterial performance and recyclability of existing antibacterial materials. To address these issues, this study synthesized a core@shell@shell@satellite structured Fe 3 O 4 @SiO 2 @polydopamine (PDA)@tannic acid (TA)@Ag nanocomposite, aiming to achieve excellent photothermal effect and synergistic antibacterial activity with silver. The composite particles exhibited improved dispersibility due to the SiO 2 coating. The modification of TA on the Fe 3 O 4 @SiO 2 @PDA achieved the uniform loading of silver nanoparticles (NPs), which significantly enhanced the photothermal conversion efficiency (η) of up to 74.9 %. Additionally, the superparamagnetic property facilitated magnetic separation, ensuring the efficient recovery and reutilization of the nanocomposites. Under low concentration and low-power near-infrared (NIR) light irradiation (808 nm, 1.0 W cm −2 ), the nanocomposite demonstrated excellent synergistic antibacterial activity, achieving efficient eradication of Escherichia coli (100 %) and Staphylococcus aureus (98 %). Furthermore, the material could be recycled up to five times without significant loss of antibacterial activity. Overall, our approach demonstrates the potential of novel multifunctional composite NPs in the treatment of bacterial infections and the sustainable application of antibacterial agents.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zejia Li,Shude Zhang,Ping Liang,Chi Zhang,Tao Li,Zhenbao Zhang,Mingming Wang,Zongping Shao,Shaomin Liu
Recent extreme weather events emphasize the urgent need for climate action, necessitating a shift from fossil fuels to cleaner energy sources. Carbon capture and storage (CCS) projects offer a viable solution, particularly those employing Oxyfuel combustion. Oxygen transport membranes via mixed ionic and electronic conducting (MIEC) principles are envisaged to improve the viability of Oxyfuel combustion projects by providing a cost-effective method for oxygen separation. This paper explores the performance enhancement of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3–δ (BSCF) perovskite membranes, typically known for high oxygen flux but suffering from low stability. A universal strategy employing a facile Ag doping method is investigated. The Ag-doped BSCF (BSCF–2%Ag) membranes exhibit improved stability and oxygen permeation behavior compared to their undoped counterparts. The structural and compositional analyses confirm the successful incorporation of Ag into the BSCF lattice, not only playing the role as the sintering aid but also inhibiting Sr segregation and enhancing operational stability. Long-term permeation tests demonstrate the sustained performance of BSCF-2%Ag membrane, showcasing a 31.2% improvement in oxygen flux at 800 °C. The proposed Ag doping strategy offers a promising pathway for simultaneously enhancing the stability and flux of Co-perovskite membranes, which is crucial for advancing CCS technologies.
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Journal of Energy Storage
·
2025
·
IF 9.8
Chuying Zhang,Na Zhang,Haotong Guo,Jinbo Bai,Hang Zhao
Polymer-based dielectric capacitors are crucial for electronics and electric power systems due to their ultrahigh power density. However, the low energy density of polymer-based dielectrics becomes one critical shortcoming that severely limiting their practical application range. Herein, a typical surface-modified poly(vinylidene fluoride) (PVDF)-based composite dielectric with excellent energy storage property is presented. In order to construct a structurally-stable metal-dotted functional unit, a type of special Ag-dotted mesoporous silica-coated silica (SiO 2 @mSiO 2 @Ag) nanoparticles with core-satellite structure is designed. In this nano-architecture, the Ag nanoparticles can be tightly fixed in the porous shell and isolated from each other by the wedge-shape of SiO 2 @mSiO 2 nano-substrates. Both the micro-capacitance structure and Coulomb-blockade effect that induced by the Ag nanoparticles can effectively improve the permittivity, breakdown strength and the overall energy storage property of the composite dielectric. Moreover, the surface defects of composite dielectric can be partially modified by using polymethyl methacrylate (PMMA) ultrathin outer layers. Benefiting from these regulations to both the electrode-dielectric interface and nano-structure of functional unit, an excellent energy density of 13.8 J/cm 3 at the high electric field of 534.1 MV/m is obtained from the PVDF-based composite incorporated with as small as 0.5 wt% SiO 2 @mSiO 2 @Ag nanoparticles. This study provides an effective strategy for the development of polymer-based film capacitors with an advanced energy storage property.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Mingjing Ma,Huanhuan Yu,Baolin Zhu,Wenjun Zheng,Shoumin Zhang
The design of efficient catalysts with atom clusters (ACs) and single atoms (SAs) as active sites for water splitting presents an effective approach for improving bifunctional electrocatalytic performance by synergistically promoting electron transport and proton transfer kinetics. In this work, a series of Fe2O3-supported noble metal catalysts (M = Ru, Rh, Pd, Ag) incorporating both ACs and SAs sites were developed, with detailed characterization identifying Ru ACs as the primary active centers. The designed-interfacial M-O-Fe bonds play a critical role in charge redistribution, subsequently enhancing electron and proton transfer kinetics. The resulting heterostructure optimizes both the electronic environment and active site accessibility, yielding exceptional electrocatalytic performance. Further density functional theory calculations demonstrate that the incorporation of Ru species leads to increased filling of antibonding orbitals and modulation of the d-band center, subsequently reducing the energy barrier of the rate-determining steps to −0.267 eV for HER and 1.522 eV for OER, respectively. Consequently, the representative Ru/Fe2O3 with Ru content of 1.1 wt.% achieves an OER overpotential of 189 mV and a HER overpotential of 21 mV at a current density of 10 mA cm−2. This study highlights a novel approach to the design of advanced bifunctional electrocatalysts by engineering interfacial bridge bonds.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Jiaying Lu,Yanqing Guo,Yihang Xin,Xiaogang Yang,Jiusheng Li
Achieving a controllable synthesis of metal nanoparticles depends very much on the hydrodynamics of the synthesis process, in particular the local turbulence that has been considered to have a significant impact on the synthesised nano particle size and morphology. This paper reports the study on turbulence induced shear regulatable synthesis of the silver nanoparticles (AgNPs) using a counter axial-swirling impinging jet flow reactor (CASIJR), exploring the effect of turbulent shear stress on the formation of AgNPs. The micro-mixing and turbulence induced shear in the flow inside the CASIJR reactor were evaluated using Reynolds Average Navier-Stokes (RANS) modelling coupled with the Reynolds Stress Model (RSM). It was indicated from the simulations that an increase in the axial-swirling circular pipe flow diameter based Reynolds number from 3300 to 4900 would enhance the mixing and local turbulence induced shear, characterising by an increase in the mixing index. It was also found from the AgNPs synthesis experiments that there exists a strong correlation between the turbulent shear stress u ′ v ′ ¯ and the synthesised AgNPs size. The average synthesised nano particle size, size distribution, and morphology of AgNPs are affected by the micro-mixing and anisotropic turbulence induced shear in the CASIJR.
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