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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高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 18
·期 1
·1-9
·
IF 4.5
Sun Likun,Xiong Kesi,Zhang Baoning,Fang Jinghong,He Yingchao,Wang Min,Gan Zhixing,Du Fanglin,Sun Qiong,Yu Liyan,Dong Lifeng
In a dual-chamber photocatalytic fuel cell device, polyvinyl alcohol degradation and H 2 evolution were concurrently achieved. The setup involved commercial P25 as the photoanode and Ag@Fe 2 O 3 nanoparticles as the cathode. Additionally, the feasibility of a Fenton-like reaction in the cathode, utilizing Fe 2+ ions and pumped O 2 , was demonstrated. Different cathode materials, polyvinyl alcohol types, and pH values’ effects were assessed on device performance. Quenching tests highlighted photoinduced holes (h + ) and OH· radicals as pivotal contributions to polyvinyl alcohol degradation. Long-term stability of the device was established through cycling experiments.
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高影响因子
ACS Sensors
·
2025
·
IF 9.1
Jiaji Hou,Fengyan Ge,Haixia Jiang,Weiguang Liu,Chaofan Li,Xin Yan
Flexible wearable biosensors enable dynamic tracking of biomarkers in sweat through noninvasive sampling. Surface-enhanced Raman spectroscopy (SERS) utilizes the “fingerprint” vibrations of molecular vibration spectra to simultaneously analyze multiple substances, facilitating the identification of complex analytes. In this study, we integrated a Janus fabric with efficient wearable moisture management properties with silver (Ag) nanoparticles to develop an SERS sensor for human sweat detection. The hydrophobic side of the Janus fabric was designed to contact the skin, while hydrophobic patterns were printed on the opposite side to enable the efficient enrichment of target molecules. Rapid sweat transport was achieved through a combination of a hydrophilic–hydrophobic interfacial design. The moisture management capability and SERS enhancement mechanism of the platform were further explained through simulation. Moreover, the platform demonstrated the successful detection of real human sweat samples. This work is expected not only to provide a novel approach for the fabrication and preparation of the SERS active fabric with excellent performance but also to promote the theoretical basis and technical support for the research of textile on rapid detection in highly diluted biochemical samples.
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产品关联
DOI
PubMed
高影响因子
Food Analytical Methods
·
2017
·Vol. 11
·期 1
·69-76
·
IF 2.038
Li Pan,Teng Yuanjie,Nie Yonghui,Liu Wenhan
A simple, rapid, and environmentally friendly surface-enhanced Raman scattering (SERS) method was developed for the determination of trace amitraz in milk with the use of silver-coated gold nanoparticles (Au@Ag NPs) as enhancing reagent. The normal Raman and SERS spectra of amitraz were analyzed, and the peaks were assigned by density functional theory. The morphology of Au@Ag NPs was characterized and confirmed by transmission electron microscopy, scanning electron microscopy, and ultraviolet-visible spectroscopy. The SERS effects of Au@Ag NPs were investigated, including the types of solvents for dissolving amitraz, the volume ratio of the Au@Ag NPs and amitraz, and the concentration of aggregating agent (NaCl) for aggregate Au@Ag NPs. Results show that ethanol exerts the least interference on the SERS spectrum of amitraz and is more environmentally sound than methanol. The strongest SERS signal appeared when the volume ratio of Au@Ag NPs and amitraz was 2:1. Moreover, the strongest SERS signals appeared when the concentration of NaCl was 0.025 mol L −1 because of appropriate aggregation. Under the optimum conditions, the concentration of amitraz presents a good linear relationship with Raman intensity (723 cm −1 ) with a linear range of 9.77 × 10 −4 ~2.93 × 10 −2 g L −1 . The detected recoveries of amitraz in milk were between 81.7 and 100.5% with a relative standard deviation (RSD) of 2.61~5.51%.
研究领域:
食品科学
·
分析化学
·
环境科学
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高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 13
·5271-5277
·
IF 4.569
Ran Tian,Dong Li,Tao Zhou,Xue-Qiang Chu,Danhua Ge,Xiaojun Chen
We report an electrochemical non-enzymatic method for hydrogen peroxide (H2O2) detection based on Ag nanoparticle-decorated MoSe2 (Ag/MoSe2-500) hybrid nanostructures. These hybrid nanocomposites are easily prepared by in situ reduction of Ag+ on the surface of MoSe2. Benefiting from the strong synergy of Ag nanoparticles and MoSe2 nanosheets in enhancing electrical conductivity, the Ag/MoSe2-500 hybrid nanostructures perform excellent sensing activity for H2O2 electrocatalytic reduction with a wide linear range of 0.02–15.2 mM, a high sensitivity of 400.0 μA mM−1 cm−2 and a low detection limit of 0.39 μM (S/N = 3). Furthermore, the sensor displays satisfactory reproducibility and stability and is applicable for practical quantitative analysis of H2O2 in milk and orange juice samples. In a word, Ag/MoSe2-500 nanocomposites are promising candidates for non-enzymatic H2O2 sensing in the fields of biology and food science.
研究领域:
材料科学
·
分析化学
·
生物医学
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 5
·1772-1776
·
IF 3.288
Xin Shu,Yongren Chen,Chunling Yuan,Yilin Wang
A novel and sensitive method for ascorbic acid (AA) determination utilizing Ag+–3,3′,5,5′-tetramethylbenzidine (TMB) as a colorimetric probe was proposed. In a weak acidic medium, Ag+ could oxidize TMB to oxidized TMB (ox-TMB) and cause a blue color solution with an absorption peak centered at 652 nm. However, the addition of AA could induce the reduction of ox-TMB, leading to shallower blueness and lower absorbance. Under the selected experimental conditions, there was a good linear relationship between the decrease of absorbance (ΔA) and AA concentration in the range of 0.5–60 μM, and the detection limit was as low as 0.23 μM. The feasibility of this method was verified in commercial beverages with recoveries of 95.8–104.1%. The method has the advantages of simplicity and practicability. More importantly, no nanomaterials need to be prepared.
研究领域:
分析化学
·
食品科学
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2015
·Vol. 75
·期 3
·680-692
·
IF 1.532
Wang Zhen-Zhen,Zhai Shang-Ru,Zhai Bin,An Qing-Da,Li Shao-Wei
Abstract
A novel core–shell-structured Ag-based magnetic functional polymer nanocatalyst, i.e., Fe 3 O 4 @SN/GLA@chitosan-Ag (SN represents animo-functionalized SiO 2 , GLA signifies glutaraldehyde), was fabricated via a simple and environmentally friendly method. The magnetic separation property of Fe 3 O 4 , the protection effects of SiO 2 , the reduction and stabilization activities of chitosan, and the catalytic property of Ag nanoparticles (NPs) in the multifunctional catalyst system were efficiently combined using glutaraldehyde as bridging agent. The Ag NPs with average diameter about 2–11 nm were generated in situ and stabilized by chitosan, which acted as reducing agent and stabilizer in the absence of other potentially toxic reagents. Furthermore, the reduction, chelation ability of chitosan, and the size of Ag NPs were found to be tunable, thereby enabling the preparation of other noble metal catalysts with tailored properties. Most importantly, the as-prepared catalyst exhibited superior catalytic performance (the reduction reaction was finished within 3 min) and reusability (reusable for at least six times) in the reduction of 4-nitrophenol. Graphical Abstract
研究领域:
材料科学
·
环境科学
·
化学工程
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Rongjing Jia,Shuling Chang,Ruirui Wang,Yanhong Xu,Rijie Wang,Lihong Zhang
The electrocatalytic CO 2 reduction reaction to CO (ECO 2 RR) is an effective way to achieve carbon resource utilization. It requires catalysts that can synergistically couple CO 2 activation with efficient CO desorption. This work engineers this synergy by constructing an interfacial Ag δ+ -O-Zn configuration on Zn(OH)F-derived supports via controlled Ag loading (0–5 wt%). The optimal catalyst (3A/Z, 3 wt% Ag) balances the formation of interfacial, oxidized Ag species (Ag δ+ ) with well-dispersed metallic Ag 0 nanoparticles. It achieves a CO Faradaic efficiency of 95.4% at −1.15 V vs. RHE and maintains 86% efficiency over 5 h at 6.38 mA cm −2 . In-situ ATR-SEIRAS spectra and kinetics reveal that Ag δ+ -related sites lower the barrier for *COOH formation, while adjacent Ag 0 domains facilitate *CO desorption. Excessive loading (5A/Z) promotes Ag aggregation and support decomposition, diminishing the critical Ag δ+ -O-Zn interface and performance. This study highlights interface coordination engineering as a key strategy for designing bifunctional ECO 2 RR catalysts.
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DOI
高影响因子
Applied Materials Today
·
2026
·
IF 7
Rimsha Abbas,Muhammad Umair,Suzhu Yu,Jingjing Luo,Peike Wang,Jun Wei
Highly conductive and flexible inks are crucial for the fabrication of next-generation wearable electrochemical sensors. This study presents a multi-ion sweat sensor composed of screen-printed Ag-MXene conductive ink, featuring a high electrical conductivity of 2 × 10 6 S m -1 . A novel electrode configuration was developed, comprising three working electrodes (WEs) together with a common reference (RE) and counter electrode (CE), all coated with the same ion-selective gel. The use of a uniform gel across all WEs ensures a consistent sensing environment, minimizes ion cross-talk, and improves repeatability. The Ag-MXene ink has excellent electrochemical activity, resulting in rapid, reproducible, and very selective potentiometric responses even at low ion concentrations. The Ag-MXene ink-based multi-ion sweat sensor achieved near-Nernstian sensitivities of 65.1 ± 0.7 mV/decade for Na + , 59.8 ± 0.6 mV/decade for K + , and 57.5 ± 0.8 mV/decade for Li + . These results are close to the theoretical Nernstian slope (∼59.2 mV/decade at 25 °C). On-body testing reveals that the sensor performs consistently under mechanical deformation and in real-world situations, demonstrating its viability for continuous health monitoring. After mechanical cycling, the Ag–MXene electrodes retained R/R 0 ≈1 with negligible hysteresis, demonstrating the structural and electrical integrity of the composite ink. Sensing cycling further verified stability: repeated stepwise measurements for Na + (5–160 mM), K + (1–32 mM), and Li + (1–100 mM) produced nearly identical potential peaks across successive cycles with no cumulative drift and minimal up/down hysteresis. The calibrations remained near-Nernstian, with response times of ∼2–3 s and sub-second recoveries, demonstrating excellent mechanical and electrochemical durability. The scalable screen-printing fabrication approach enables the cost-effective and reliable fabrication of flexible, wearable multi-ion sensors. This study demonstrates the potential of Ag-MXene-based electrodes for high-performance, multi-functional sweat sensing and offers a feasible path to enhance wearable electronic technologies.
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.1
Yueyue Ma,Yu Zeng,Ruxi Lin,Liping Chen,Mingzhu Shen,Xiaojun Luo,Bing Shao
Letrozole, anastrozole and trimetazidine are all included in the prohibited list of the World Anti-Doping Agency (WADA). At present, there is still a lack of a systematic Surface-Enhanced Raman Spectroscopy (SERS) spectral database for these drugs, and traditional detection methods suffer from limitations such as insufficient sensitivity and cumbersome operation procedures. In this study, a novel COF@Ag composite was utilized as a SERS-enhanced substrate in combination with a portable Raman spectrometer, allowing for accurate identification and effective differentiation of the characteristic peaks of the three prohibited drugs. Moreover, this method exhibited excellent performance in detecting actual milk matrix samples, with the spiked recovery rate ranging from 98.9% to 101.1%, thereby directly meeting the practical demands of on-site rapid screening. This work offers a reliable and convenient strategy for both sports food safety monitoring and pharmaceutical analysis.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 11
·1-11
·
IF 4.3
Fu Huiyu,Wu Jiewen,Liang Changhai,Chen Xiao
With the advantages of low raw material cost and 100% atom utilization, the synthesis of high value-added chemical product cyclic carbonates by the cycloaddition of CO 2 to epoxides has become one of the most prospective approaches to achieve the industrial utilization of CO 2 . In the reported catalytic systems, the complexity of the catalyst synthesis process, high cost, separation difficulties, and low CO 2 capture limit the catalytic efficiency and its large-scale application. In this paper, Ag nanoparticles loaded on polyethyleneimine (PEI)-modified UiO-66-NH 2 (Ag/PEI@UiO-66-NH 2 ) are successfully synthesized by in situ immersion reduction. The Ag nanoparticles and the amino groups on the surfaces of PEI@UiO-66-NH 2 contribute to the adsorption of CO 2 and polarization of C–O bonds in epoxides, thereby boosting the conversion capability for the CO 2 cycloaddition reaction. At the amount of propylene oxide of 0.25 mol and the catalyst dosage of 1% of the substrate, the yield and selectivity of propylene carbonate are up to 99%. In addition, the stability and recyclability of Ag/PEI@UiO-66-NH 2 catalyst are attained. The Ag/PEI@UiO-66-NH 2 catalyst also demonstrates a wide range of activity and distinctive selectivity toward cyclo-carbonates in the cycloaddition of CO 2 to epoxides. This work provides a guide to designing a highly efficient catalyst for in situ capture and high-value utilization of CO 2 in industrial applications.
研究领域:
化学工程
·
材料科学
·
催化化学
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高影响因子
Desalination and Water Treatment
·
2014
·
IF 0.987
Mengying Gan,Yongqiang Huang,Yunlei Zhang,Jianming Pan,Weidong Shi,Yongsheng Yan
Ag/halloysite nanotubes/Fe3O4 (Ag/HNTs/Fe3O4) nanocatalyst was synthesized in our work. The structure of the as-prepared composite catalyst was that Fe3O4 nanoparticles with the size of 5.0–8.0 nm were loaded in the internal hollow lumen of HNTs and Ag nanoparticles with a mean diameter of 20 nm were randomly deposited on the external surface of HNTs/Fe3O4. The resultant Ag/HNTs/Fe3O4 exhibited satisfied catalytic activity (with conversion of 100% in 38 min) to the reduction of 4-nitrophenol (4-NP) with sodium borohydride. The catalytic activity was markedly enhanced when the catalysts concentration was increased (the rate constant was gradually increased from 0.40 to 20.18 × 10−3 s−1). Also, the advantage of the obtained magnetic composite catalyst in terms of their fast separation and simple reuse was identified through five successive catalytic and separation process cycles. It could be concluded that Ag/HNTs/Fe3O4 showed satisfied catalytic activity, recoverability, and reusability, which showed great potential for practical application for water treatment.
研究领域:
纳米技术
·
环境催化
·
材料科学
·
水处理
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高影响因子
危险品化学品经营许可证（带存储）