TALANTA
·
2024
·
IF 5.6
Anni Cui,Jialu Zhang,Zhifei Liu,Xin Mu,Xiahua Zhong,Haitao Xu,Guiye Shan
Epinephrine (EP) is a crucial neurotransmitter in the central nervous system. However, an abnormal level of EP in biological fluids can lead to various diseases. Therefore, it is essential to rapidly and accurately detect EP content. Herein, electrically stimulated patterned Au@Ag nanoarrays with laccase-mimicking activity were designed for the dual-mode detection of EP concentration. The patterned Au@Ag nanoarrays exhibit excellent electrochemical properties and electrically stimulated laccase-mimicking activity. They provide sensitive electrochemical responses for detecting EP content. Simultaneously, the Au@Ag nanoarrays can catalyze the oxidation of EP, enabling its detection through a colorimetric process. This dual-mode approach achieves the detection of EP content over a wide linear range of 0.5–200 μM, with a low detection limit of 0.152 μM. Furthermore, the utility of these nanoarrays for sensing EP in human serum was evaluated. This work provides a convenient method using patterned nanozyme array for the visible, rapid and accurate detection of EP content. It provides the important implication for the development of portable and reliable on-site analytical instruments.
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DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Bohan Shan,Yunhan Hu,Tongzhou Xu,Zhengyuan Zhao,Haodong Zhong,Yunhan Ling,Weipeng Wang,Zhengjun Zhang
The full release of surface-enhanced Raman spectroscopy (SERS) potential relies on modification of the substrate surface. However, chemical functionalization on silver substrates has, in some cases, resulted in anomalous behaviors that are difficult to explain. In this study, we investigate the role of Ag+ leaching from a silver surface in disrupting the performance of carboxyl-terminated self-assembled monolayers (SAMs). Using 4-mercaptobenzoic acid (4-MBA) as a model, we demonstrate that Ag+ released during SAM formation coordinates with carboxylate groups, inducing both aberrant SERS responses and multilayer adsorption that cannot be removed by conventional rinsing. To address this issue, we introduce a deoxygenation treatment─immersing freshly deposited AgNRs in KBH4 solution under inert atmosphere─to remove surface oxides and suppress Ag+ release. Treated Ag-4-MBA nanosensors exhibit restored, stable, and accurate pH responsiveness and reliably detect 30 ppm gaseous acetic acid. Our findings elucidate Ag+ interference on carboxyl and develop a robust strategy to enhance the reliability of silver-based SERS sensors, paving the way for their broader applications in molecular sensing.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Dawei Lu,Wen Meng,Xiaowei Wen,Feng Li,Taohai Li
Herein, an Ag/Ni(dmgH) 2 photocatalyst was constructed through a controllable silver modification strategy. The combination of the local surface plasmon resonance (LSPR) effect of Ag nanoparticles and the synergistic catalytic effect of Schottky junctions significantly enhanced photogenerated carrier separation. Under optimized conditions, the Ag/Ni(dmgH) 2 system achieved a remarkable hydrogen evolution rate of 922.2 μmol/g/h under visible light, approximately 16.7 times higher than the unmodified system. Furthermore, the Ag/Ni(dmgH) 2 film fabricated via screen-printing technology effectively utilized enhanced light absorption from LSPR and efficient interfacial electron transport from Schottky junctions, achieving degradation rates of 98.9 % for Rhodamine B and 86.9 % for Quinoline Blue. The film retained 86.9 % of its activity after four cycles, demonstrating excellent recyclability. This work highlights the dual application potential of Ni(dmgH) 2 materials for photocatalytic energy conversion and environmental remediation.
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高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Xintu Lin,Ruijie Jin,XinYi Li,Jingjing Kou,Ruilan Xu,Xin Dai,Shangxi Zhang,Yong Peng,Yuejun Liu
Low-thickness, eco-friendly electromagnetic interference (EMI) shielding materials with high shielding effectiveness (SE) are urgently needed to address escalating electromagnetic pollution in miniaturized electronic devices. Herein, we synthesized silver nanoparticle-decorated multiwalled carbon nanotubes (MWCNTs@Ag) via a rapid solvent-free method and integrated them into poly(lactic acid) (PLA) matrices to fabricate composite films through solution casting. The resulting PLA/MWCNTs@Ag composite film containing 10 wt% MWCNTs@Ag achieves an average EMI SE of 18.59 dB at a thickness of approximately 95 μm, with the shielding mechanism dominated by surface reflection. To strategically control EMI attenuation pathways, multilayered architectures were engineered using layer-by-layer solution casting while maintaining identical filler content. Systematic analysis reveals that both thickness and layer number significantly influence EMI shielding performance. Notably, a multilayer film with a thickness of approximately 155 μm and seven layers exhibits an average EMI SE of 24.43 dB with an absorption-dominated mechanism, showing a 31.41% enhancement over single-layer counterparts. This performance transition from reflection to absorption dominance originates from optimized impedance matching, enhanced interfacial polarization, multiple internal reflections, and reconstructed conductive networks enabled by structural design. The synergy between hierarchical structure engineering and hybrid filler incorporation provides new insights for developing sustainable high-performance EMI shielding materials.
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高影响因子
IONICS
·
2025
·
IF 2.6
Wang Yao,Wu Yidi,Zhang Pengzhan,Xu Bing,Wang Kangkang,Zhang Liang,He Zhixian,Zhang Shengnan
The novel MnO x /CN/Ag composite was prepared by the precipitation method. The structure and morphology of the material were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Light absorption capacity, charge transfer efficiency, and carrier recombination ability were evaluated using UV–Vis diffuse reflectance (UV–Vis DRS) spectroscopy, electrochemical impedance spectroscopy (EIS), photoluminescence (PL) spectroscopy, and transient photocurrent response (TPR). The photothermal catalytic performance toward toluene and tetracycline hydrochloride (TC) was assessed, and the reduction properties were analyzed by H 2 -temperature programmed reduction (H 2 -TPR). The results show that the MnO x /CN/Ag composite achieves a degradation efficiency of 97% for toluene at 260℃ and a TC degradation efficiency of nearly 80%. No obvious attenuation was observed after 360 min of continuous reaction. The superior catalytic performance and stability of the composite can be attributed to the abundant oxygen vacancies and low reduction temperature. This work not only provides a novel photothermal catalytic material for enhancing VOC degradation but also offers insights into the treatment of multiple environmental pollutants. Graphical abstract
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JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Yan Tong,Xiaofeng Lu,Weining Sun,Guangdi Nie,Liu Yang,Ce Wang
A high-performance hydrogen generation system based on the electrospun polyacrylonitrile (PAN)/Ag/Pd composite nanofibers , which were prepared by microwave reducing the electrospun PAN/AgNO 3 nanofibers and followed by a replacement reaction has been demonstrated. The morphology of the as-prepared PAN/Ag/Pd composite nanofibers and the metal nanoparticles on the fibers were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution TEM (HRTEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) measurements. It has been demonstrated that the obtained PAN/Ag/Pd composite nanofibers possess fine morphology and high catalytic activities for H 2 generation from aqueous solution of ammonia borane (NH 3 BH 3 , AB). The H 2 generation test exhibited that the catalyst had excellent catalytic activity (with turnover frequency (TOF) of 377.2 mol H 2 h −1 (mol Pd) −1 ), good recycle stability and easy-separation from the reaction system. This new kind of nanofibers possesses great potential application for the new clean energy development.
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高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Xueyan Chen,Min Chen,Guangzhi He,Fei Wang,Guangyan Xu,Yaobin Li,Changbin Zhang,Hong He
Ag-based catalysts are efficient materials for formaldehyde (HCHO) oxidation in the low-temperature range. It has been reported that K addition can increase the catalytic performance of Ag-based catalysts, whereas the specific role of K doping remains ambiguous. In this work, Ag/Al2O3 and K–Ag/Al2O3 catalysts with different K doping levels were prepared and subsequently tested for catalytic HCHO oxidation. It was observed that K doping has a dramatic promotion effect on the activity of the Ag/Al2O3 catalyst. The 2K–Ag/Al2O3 sample was the most active catalyst, over which HCHO could be completely converted into CO2 and H2O in a gas hourly space velocity of 100 000 mL/(gcat h) at 65 °C. The catalysts were next characterized by X-ray powder diffraction, Brunauer–Emmett–Teller, transmission electron microscopy, H2-temperature-programmed reduction, UV–vis, X-ray absorption fine structure, and in situ diffuse reflectance infrared Fourier transform spectroscopy methods. The characterization results show that addition of K species increased the content of metallic Ag species in Ag/Al2O3 catalysts and promoted the adsorption and activation of oxygen species, whereas excessive doping with K+ resulted in the agglomeration of Ag particles and loss of some metallic sites. Therefore, the 2K–Ag/Al2O3 catalyst demonstrated the best performance among the series of K-doped catalysts. Promotion of O2 activation by K doping, rather than enhanced Ag dispersion or surface OH activation or exposure of more Ag(111) facets, was found to be the key factor in the improved catalytic performance of K–Ag/Al2O3 catalysts.
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高影响因子
JOURNAL OF CATALYSIS
·
2016
·
IF 7.354
Shuang Liu,Xiaodong Wu,Wei Liu,Wenming Chen,Rui Ran,Min Li,Duan Weng
Three model ceria catalysts, which are monocrystalline CeO 2 nanocubes, polycrystalline CeO 2 nanoparticles, and polycrystalline CeO 2 spindles, were synthesized and analyzed with isothermal soot oxidation, H 2 -TPR, and Raman spectroscopy. The results suggest that the initial activity of the catalyst is determined by the number of catalyst–soot contact points rather than the catalyst surface area, while the catalyst stability is closely related to the concentration of surface oxygen vacancies . Excessive surface oxygen vacancies may inhibit the regeneration of highly active O 2 − and lead to catalyst deactivation during reaction. After impregnation with Ag, O − can be readily regenerated and transformed to O 2 − , resulting in a 10-fold increase in soot oxidation activity over Ag/CeO 2 . Among these catalysts, Ag supported on nanocubic CeO 2 exhibits good availability of O 2 − and therefore high catalytic activity and stability, and is thus considered a promising catalyst for application in gasoline particulate filters.
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高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2023
·Vol. 42
·期 6
·617-622
·
IF 5.4
Wei-Xing Chen,Yu-He Xu,Cui-Cui Wang,Lei Qiao,Zi-Yan Guo,Wen-Juan Tian,Zhong-Ming Sun
Comprehensive Summary Binary polyantimony clusters, namely [Cu 2 Sb 14 ] 4– and [Ag 2 Sb 14 ] 4– , containing coinage metals, were successfully synthesized and characterized, in which two homoatomic Sb 7 3– subunits are bridged by two coinage metals in η 4 : η 1 and η 1 : η 1 coordination modes, respectively. In [Cu 2 Sb 14 ] 4– , two bridging Cu ions and two Sb atoms form a planar rhombic unit, which was revealed to have antiaromatic properties by theoretical calculations. Further electron structure and bonding analysis confirmed the presence of delocalized bonds in the rhombic unit and the metallophilic interaction between two formal M + ions.
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Guangzhi Nie,Jing Xue,Yuyu Gao,Zhaoqing Wang,Hang Wang,Jiangbin Wu,Yunze Long,Wenpeng Han
The detection of gaseous molecules using surface-enhanced Raman spectroscopy (SERS) remains challenging due to the rapid diffusion and low intensity of gas molecules. In this study, we developed a flexible and breathable SERS substrate by in-situ growth of Ag@ZIF-8 nanoparticles on electrospun nylon 6/6 fibers. The microchannels in the fiber membrane, combined with the high porosity of ZIF-8, enable effective capture and enrichment of volatile organic compounds (VOCs) in SERS hot spots. The optimized substrate demonstrated a detection limit of 6.64 × 10 −8 M for dithiohydroquinone (DP) gas, along with excellent reproducibility, linear correlation (R 2 = 0.99), and stability over 30 days. Furthermore, using a residual neural network (RNN) model for deep learning analysis, the substrate achieved 100 % accuracy in detecting gaseous glutaraldehyde (GA), a typical VOC found in disinfectants. This study showcases the potential of nylon/Ag@ZIF-8 substrates, enhanced by artificial intelligence, for practical and precise detection of gaseous molecules in various environments.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2026
·Vol. 37
·期 7
·e70678
·
IF 3.8
Yu Zeng,Lu Tang
Dielectric elastomer has attracted much attention for its promising application in soft robots, actuators, and generators. Nevertheless, fluorosilicone rubber (FSR), as a typical dielectric elastomer matrix, possesses inherently low dielectric permittivity, severely limiting its electromechanical actuation performance. To address this issue, two-dimensional (2D) MXene nanosheets and zero-dimensional (0D) Ag nanoparticles were incorporated into FSR via mechanical mixing and hot-pressing to prepare FSR/MXene/Ag composites. Results show that MXene and Ag were dispersed well in the FSR matrix and the composites were thermally stable up to 390°C. A relatively high dielectric permittivity of 16.63 (2.49 times of pure FSR) was achieved at 10 3 Hz for the composite with 1.2 phr (parts per hundred of rubber) MXene and 3.2 phr Ag, while the loss tangent remained below 0.012. This can be attributed to the synergistic effects of the hybrid fillers where the 0D Ag nanoparticles effectively suppress the agglomeration of 2D MXene nanosheets, while the heterogeneous interfaces between MXene/Ag and FSR significantly enhance interfacial polarization. Furthermore, the FSR/MXene/Ag composites not only show improved tensile strength and elongation at break with decreased elastic modulus, but also exhibit enhanced electromechanical sensitivity, achieving a large electromechanical strain of 16.05% (205% increment of pure FSR) under an electric field of 40 kV mm −1 . This work provides a feasible strategy for designing dielectric elastomers with enhanced electromechanical performances.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2026
·Vol. 28
·期 7
·180
·
IF 3.5
Ali Zubair,Khan Iltaf,Wang Chunjuan,Ali Farman,Mujahid Laiba,Zaman Saeed,Arif Umar,Chen Xiaohu,Ali Nisar
Dyes represent a major class of water pollutants worldwide, posing significant threats to aquatic ecosystems and the environment due to their discharge into industrial wastewater without treatment. Thus, before releasing organic colors and their derivatives into rivers, they must be degraded using heterogeneous photocatalysts. Similarly, burning fossil fuels releases massive amounts of CO 2 into the atmosphere, exacerbating global warming and environmental devastation. Herein, we report the design and fabrication of Ag/CdSe/g-C 3 N 4 (i.e., Ag/CdSe/CN) as a highly efficient photocatalyst for the degradation of Toluidine Blue dye and CO 2 conversion to value-added products. X-ray diffraction analysis confirmed the crystalline nature of the as-synthesized photocatalyst. SEM and TEM analysis revealed that Ag and CdSe nanoparticles are uniformly dispersed on the surface of a 2D sheet-like structure for CN. The photocatalytic performance of the photocatalysts was explored at different parameters such as dye and photocatalyst doses, pH, and time. The as-fabricated Ag/CdSe/CN photocatalyst revealed exceptional performance for Toluidine Blue dye degradation under visible light irradiation, with a notable 92.3% degradation at pH 13, which is remarkably higher than those of the CdSe/CN, CdSe, and CN photocatalysts. Additionally, the Ag/CdSe/CN photocatalyst revealed outstanding performance for visible light catalytic CO 2 conversion to CH 4 (i.e., 9 μmol g⁻ 1 h⁻ 1 ) and CO (28 μmol g⁻ 1 h⁻ 1 ), in comparison to the reference samples. This work will provide a new route for the design and fabrication of highly efficient photocatalysts for environmental applications. Graphical abstract Graphical abstract showing the design of Ag/CdSe/g-C 3 N 4 nanocomposite for CO 2 conversion and dye degradation
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