ChemistrySelect
·
2025
·Vol. 10
·期 38
·e03531
·
IF 2
Yun Li,Xiaoying Liu,Jinpeng Xue,Jingyi Ma,Xing Li,Wensheng Yang
Silver is widely used in daily life and industry, resulting in environmental release and potential health risks from toxic silver ions (Ag + ). In this study, a paper-based colorimetric sensing strategy utilizing ascorbic acid (AA)-modified gold nanoparticles (AA@AuNPs) was developed for the rapid and portable detection of silver ions in various aqueous matrices. Under optimized conditions, AA coordinates the AuNP surface and promotes the formation of an Ag@Au core–shell upon exposure to Ag+, yielding a distinct colorimetric response. The sensing mechanism and surface chemistry were validated by dynamic light scattering (DLS), transmission electron microscopy (TEM), zeta potential analysis, Fourier-transform infrared spectroscopy (FT-IR), and UV–visible (UV–vis) spectrophotometry. High specificity toward Ag + with strong anti-interference in the presence of common coexisting ions was demonstrated, and a combined-interference test confirmed negligible cross-reactivity. Quantitatively, excellent linearity ( R 2 = 0.99) was achieved, with a UV–vis detection limit of 0.49 µg mL −1 and a naked-eye detection threshold of 6.0 µg mL −1 . The paper strips enabled Ag + capture for post-analysis recovery and safe disposal, reducing secondary pollution relative to solution-based assays. The platform is simple, low-cost, and field-deployable, and validation in tap-water samples with reliable recoveries underscores its potential for on-site Ag + monitoring. Graphical This work presents portable paper test strips embedding ascorbic acid (AA)-modified gold nanoparticles for colorimetric Ag + detection. AA reduces Ag + , yielding Ag@Au core-shells that shift the localized surface plasmon resonance (LSPR) and change color. The assay shows high selectivity with anti-interference, linearity ( R 2 = 0.99), UV-vis LOD 0.49 µg mL −1 , naked-eye threshold 6.0 µg mL −1 , and validated tap-water recoveries.
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产品关联
DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2022
·Vol. 96
·期 11
·2490-2496
·
IF 0.791
Khan Misbah Ullah,Ullah Hayat,Honey Shehla,Gul Zarif,Ullah Shaheed,Ullah Bakhtar,Manan Abdul,Ullah Munzer,Ali Shad
Abstract Noble metal bimetallic nanostructures, such as Ag and Au, are used in a variety of fields including nanoscience, catalysis, electronics and nanotechnology because of high stability and adsorption rate etc. However controlled synthesis of bimetallic nanostructures is challenging. Therefore, the current study emphasizes on two step controlled synthesis of Au/Ag nanostructures with tunable sizes for catalytic purposes. Using electrochemical deposition (EC) technique, the fabrication of Au/Ag nanostructures were achieved in two stages, through galvanic reaction. The catalytic capabilities of an Au/Ag nanostructure and Ag flower-like structure were examined through reduction of p -nitrophenol in the presence of sodium borohydride (NaBH 4 ). The catalytic investigation was measured in temperatures rage of 25 to 45°C at constant time. The study shows that catalytic activity of Au/Ag nanostructure is higher than that of Ag flower-like structure in the reduction of p -nitrophenol.
研究领域:
纳米科学
·
催化化学
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 4
·3646-3652
·
IF 1.338
Yang Ailing,Wang Ning,Wang Yujin,Li Shunpin,Wang Lele,Yang Yun,Bao Xichang,Yang Renqiang
Silver nanoparticles (NPs) with diameters less than 25 nm, and 5, 10, 15, 20-tetrakis(4-carboxy-phenyl) porphyrin potassium salt (K4TCPPS) was synthesized. By adding silver colloids into the K4TCPPS solutions, the fluorescence concentration quenching of the K4TCPPS
solutions was improved between 1×10−6–5×10−4 M, depending on the size of the Ag NPs, the concentration of the K4TCPPS and the excitation wavelength. Under excitation wavelengths of 360 and 414 nm, the enhancement was in the range
of 0.34–22.8, and 0.71–82.46, respectively. The enhancement increased with decreasing size of the Ag NPs. At the two highest enhancements, the concentrations of the K4TCPPS solutions were 1×10−4 and 1×10−5 M respectively,
and the size of the Ag NPs was about 5 nm. The main reasons for the fluorescence enhancing effect are due to fluorescence resonance energy transfer (FRET) between K4TCPPS molecules and Ag NPs, and decreased collision quenching between free K4TCPPS molecules, and free K4TCPPS
molecules with Ag NPs. Our results showed that Ag NPs with sizes of about 5 nm can effectively improve the fluorescence concentration quenching of K4TCPPS solutions. This result also suggests that it is possible to use noble metal NPs to improve fluorescence concentration quenching.
研究领域:
材料科学
·
光学
·
生物化学
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DOI
PubMed
高影响因子
KEY ENGINEERING MATERIALS
·
2014
·
IF 0
Wei Zhou,Zhi Qiang He,Xiu Jian Zhao
Metal-enhanced fluorescence (MEF) of Ag nanoparticles (NPs) in the presence of dye molecules has been studied for application in luminescent solar concentrator (LSC) devices. The LSC was prepared from bulk polymerization reaction of methyl methacrylate (MMA), which was the matrix for the LSC devices. The polymethyl methacrylate (PMMA) sheets doped by different dye concentrations were produced. The optical properties were characterized by absorption, emission and transmission spectroscopy measurements. Effects of dye concentrations on the photovoltaic performance of LSCs were investigated and discussed. Moreover, different concentrations of Ag nanoparticles were dispersed in the matrix in the presence of dye molecules in order to study the metal-enhanced fluorescence in material. The optimal concentration of Ag NPs resulting in a maximum fluorescence emission enhancement (almost 90 %) has been obtained which induced by the particular dye/Ag NPs composite materials. It depends on the coupling and spacing between neighboring dyes and Ag NPs. The result showed that the continuous transition from fluorescence enhancement to quenching, depending on Ag NPs concentration in the LSC device. The highest efficiency (1.96%) was achieved in solar cells which were assembled by the side of the PMMA sheets with dye concentration at 20 ppm.
研究领域:
材料科学
·
光学工程
·
能源技术
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DOI
MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Jie Yang,Weiwei Li,Yilong Zhou,Huixin Liu,Kaiyuan Pei
High-performance materials often require high toughness and strength . Unfortunately, in most composites, toughness and strength are almost mutually exclusive. The simple combination of brittle carbon fibers (CFs) and rigid polyurethane (RPU) obviously cannot meet the standards of high-performance materials. In this paper, the spiral CFs (SS-CFs) were obtained by the electrodeposition . From the point of view of fracture mechanics , fracture resistance increases with crack propagation . This spiral structure provides more crack propagation paths, resulting in more energy consumption, which can lead to materials properties that are much higher than simple mixture. The results showed that the interfacial shear strength, tensile toughness, tensile strength, and impact toughness of SS-CFs/RPU composites were increased by 73.6%, 77.2%, 103.3% and 85.0%, respectively, compared with the pristine CFs/RPU composites. The main strengthening mechanisms of the materials were the pinning effect and the effective increase of the crack propagation pathway by the convex SS-CFs. At the same time, due to the deposition of the silver coating on the CF surface, the modified CFs composites also had excellent electrical conductivity and electromagnetic shielding performance. This means that our materials have a wide range of applications.
研究领域:
材料科学
·
力学
·
纳米技术
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jin-Li Qiu,Jian Su,Nisar Muhammad,Wen-Ting Zheng,Cai-Liang Yue,Fu-Qiang Liu,Jing-Lin Zuo,Ze-Jun Ding
A facile and efficient synthetic strategy was used to prepare a silver nanoparticles-doped MOF (Ag NPs@Zr-TTFTB, TTFTB = tetrathiafulvalene tetrabenzoate) catalyst. Considering the stability of Zr 6 cluster-based MOFs and the confinement of small Ag NPs (below 5 nm), title hybrids can be used for the photocatalytic degradation of sulfamethoxazole (SMZ). The prepared Ag NPs@Zr-TTFTB were found to efficiently remove SMZ (k = 0.009 min −1 ) and remain active in the wide range of pH values (3.0 ~ 9.0) and four cycles. The leaching amount of Ag and Zr under different pH values were only accounted for 0.18% ~ 0.61% and 0.01% ~ 0.05% of used Ag NPs@Zr-TTFTB, respectively, which indicated its excellent stability. Studies on the catalytic mechanism revealed that the proposed heterostructure of Ag NPs and Zr-TTFTB led to the electron transfer and the generation of active oxygen species, resulting in its remarkable photocatalytic activities.
研究领域:
材料科学
·
环境科学
·
化学
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DOI
高影响因子
iScience
·
2022
·
IF 6.107
Gan Miao,Fangchao Li,Zhongshuai Gao,Ting Xu,Xiao Miao,Guina Ren,Yuanming Song,Xiangming Li,Xiaotao Zhu
Engineering a versatile platform that enables to separate both oil/water and oil/oil mixtures and remove dye from water is not easy. To address this challenge, we have developed an Ag/polydopamine-coated textile (Ag/PDA@textile) by chemically depositing Ag particles on the textile surface using polydopamine as the binder layer. The obtained Ag/PDA@textile attracts water but repels oil in the air, underwater, and when immersed into the oil. Exploiting its water-attracting and oil resistance, the Ag/PDA@textile is acted as a separation membrane to separate oil/water mixtures with enhanced separation efficiency. The Ag/PDA@textile also possesses opposite wetting behavior to oils with different polarities, allowing it to separate oil/oil mixtures efficiently. Thanks to the catalytic performance of the Ag particle, organic dyes can be decomposed effectively by our Ag/PDA@textile under UV illustration or in the presence of NaBH 4 . Our Ag/PDA@textile may be valuable for applications in water purification and oil sewage treatment.
研究领域:
材料科学
·
环境科学
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DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 5
·1973
·
IF 3.4
Yuyi Zhang,Chengjun Liu,Xingyu Liu,Ziyu Wei,Hui Tao,Feng Xu,Lixi Wang,Jiangyong Pan,Wei Lei,Jing Chen
Upconversion devices (UCDs) have motivated tremendous research interest with their excellent potential and promising application in photovoltaic sensors, semiconductor wafer detection, biomedicine, and light conversion devices, especially near-infrared-(NIR)-to-visible upconversion devices. In this research, a UCD that directly turned NIR light located at 1050 nm into visible light located at 530 nm was fabricated to investigate the underlying working mechanism of UCDs. The simulation and experimental results of this research proved the existence of the quantum tunneling phenomenon in UCDs and found that the quantum tunneling effect can be enhanced by a localized surface plasmon.
研究领域:
光子学
·
材料科学
·
纳米技术
·
光电技术
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DOI
高影响因子
OPTICS EXPRESS
·
2022
·Vol. 30
·期 18
·32509-32527
·
IF 3.833
Fengrui Li,Baojie Shan,Xiaofei Zhao,Chang Ji,Zhen Li,Jing Yu,Shicai Xu,Yang Jiao,Yang Jiao,Chao Zhang,Baoyuan Man,Baoyuan Man
The coordination of piezoelectric and plasmonic effects to regulate the separation and migration of photo-generated carriers is still a significant method to improve the performance of visible-light photoresponse. Herein, we propose the PVDF@Ag-ZnO/Au composite nanofiber membranes utilizing the piezoelectric and plasmonic effects to promote the photocatalytic degradation of organic dyes. Here, ZnO nanorods can generate a built-in electric field under vibration to separate electron-hole pairs. The Schottky junction formed by noble metal/semiconductor can not only inhibit the recombination of photo-generated carriers and accelerate the migration of carriers, but also enhance the utilization of visible light. In addition, the structure has excellent flexibility and easy recycling characteristics. We demonstrate that the plasmonic effect of noble metal can enhance the light response of membranes and broaden light absorption from ultraviolet to visible light region. With the help of the surface-enhanced Raman scattering (SERS), modulation effects of the piezoelectric effect on light response is proved. For catalytic processes, rhodamine B (98.8%) can be almost completely degraded using PVDF@Ag-ZnO/Au within 120 minutes in the piezoelectric photocatalysis process, which is 2.2 and 2.8 times higher than photocatalysis and piezoelectric catalysis, respectively. This work provides a promising strategy for harnessing solar and mechanical energy.
研究领域:
材料科学
·
环境科学
·
光学
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DOI
高影响因子
SENSORS
·
2021
·Vol. 21
·期 7
·2300
·
IF 3.576
Tao Li,Zhinan Yu,Zhengkun Wang,Yong Zhu,Jie Zhang
A tapered fiber decorated by Ag nanoparticles is prepared as a surface-enhanced Raman scattering (SERS) substrate. There are two key parameters during the preparation process, the fiber cone angle and the density of decorated AgNPs on the fiber tip surface. Their theoretical analysis on the forming mechanism and the optimization process is studied in detail. The tapered fibers with angles from 0.5 to 30° are successfully prepared, with a chemical method in a small tube using a bending interface. AgNPs with different densities are decorated on the surface of the tapered fibers with an electrostatic adsorption method. The optimized tapered fiber SERS probe with an angle of 12° and AgNPs density of 26.67% provides the detection of Rhodamine 6G (R6G) with 10−10mol/L.Keywords:Raman scattering;tapered fiber;cone angle;AgNPs
研究领域:
光学
·
材料科学
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 4
·1-9
·
IF 5.833
Li Li,Li Siqun,Yu Xinjie,Chen Zhengbo
A colorimetric sensing method is described for discrimination of multiple antioxidants based on core-shell Au@Ag nanocubes (NCs). In order to extract data-rich colorimetric responses from the sensor array, three different concentrations of chloroaurate acid (HAuCl 4 ) were employed as sensing elements. Interestingly, Au 3+ ions can be reduced to different valence states (i.e., Au(0) and Au(I)) by different antioxidants, and thus effectively inhibit the oxidation etching process of Au@Ag NCs by Au(III) ions to varying extents, generating diverse colorimetric responses (color and absorbance). This enables identification of the six antioxidants at 10 nM via linear discriminant analysis (LDA) with relative standard deviation (RSD) of 2.52% ( n = 3). The discrimination ability of the sensor array was further evaluated in antioxidant binary and multicomponent mixtures. Remarkably, identification of these six antioxidants spiked in urine was realized with 100% of accuracy. Graphical abstract
Schematic presentation of colorimetric assay for antioxidants based on three chloroauric acid/Au-Ag nanocubes.
研究领域:
分析化学
·
纳米技术
·
生物医学工程
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DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2026
·
IF 7.3
Deyi Chen,Xinyuan Wang,Jiuzhou Zhao,Ben Tian,Ruijie Liu,Jiaxin Liu,Qing Wang,Hao Cheng,Caifu Li,Yang Peng,Yun Mou
Micron-Ag pressureless sintering faces grave challenges in high power SiC device packaging with simultaneously possessing low sintering temperature and excellent bonding strength and thermal conductivity. Herein, a cost-effective micron-Ag paste with high sintering driving force was designed and prepared by solvent engineering and preheating temperature regulation. Consequently, the optimized Ag sintered joint yields a record shear strength of 43.9 MPa at a sintering temperature of 250 °C. Furthermore, the packaged SiC device with micron-Ag paste possesses power cycle numbers of 4525 cycles, which is 1.6 times higher than that of SiC device packaged by the traditional SAC solder. The findings provide valuable guidelines to develop high quality micron-Ag paste for high power electronics packaging.
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DOI
高影响因子
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