Optical Materials Express
·
2017
·Vol. 7
·期 9
·3137-3146
·
IF 2.591
Linlin Xu,Shuang Li,Feng Li,Hua Zhang,Dameng Wang,Ming Chen,Feng Chen
The fascinating nanocomposites of semiconductors coupled with noble metals have a promising potential to develop a low-cost substrate for surface-enhanced Raman scattering (SERS) applications. Herein, the controlled construction of Ag nano-islands on ZnO nanosheets (Ag@ZnO nanocomposites) was successfully achieved by a green and effective strategy based on ultraviolet light induced-photochemical reaction. It was found that the Ag content in Ag@ZnO nanocomposites linearly increases to 4.62% by simply increasing the irradiation time (0~10 min). More importantly, increasing the Ag content (0~4.62%) in the nanocomposites results in enhanced SERS activities with an enhancement factor up to 107 and a detection limit as low as 10−9 M. Compared with the complete noble metal substrate, the novel Ag@ZnO nanocomposites (<5% Ag compositions) were cost-effective and possessed high biocompatible properties; which can be established as an advanced inexpensive substrate for ultrasensitive SERS analysis, particularly for food safety and biomedical applications.
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MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 12
·3275-3283
·
IF 4.831
Yao Youzhi,Liu Yunchun,Yang Zhousheng
The authors describe a method for room temperature preparation of reduced graphene oxide (rGO) decorated with Ag-Cu nanoparticles (NPs). The nanocomposite (Ag-CuNP/rGO) was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy and transmission electron microscopy. A glassy carbon electrode (GCE) modified with this nanocomposite dispersed is shown to be a viable electrode for determination of Sudan I (best at a working voltage of −112 mV vs. Ag/AgCl), with remarkably increased electrochemical response to Sudan I compared to that of a plain GCE. The calibration plot is linear in the 1.0 nM to 10 µM concentration range, with a 0.4 nM detection limit (at a signal-to-noise ratio of 3). The method was successfully applied to the determination of Sudan I in ketchup and chili powder.
The nanocomposite of reduced graphene oxide (rGO) decorated with Ag-Cu nanoparticles (Ag-CuNP/rGO) was prepared using NaBH 4 as a reductant at room temperature. A glassy carbon electrode (GCE) was coated with a Ag-CuNP/rGO nanocomposite to form a modified electrode that can detect trace concentrations of Sudan I.
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TALANTA
·
2017
·
IF 4.162
Qingxiang Zhou,Man Lei,Yongli Liu,Yalin Wu,Yongyong Yuan
Pollution resulted from heavy metal ions have absorbed much attention, and it is of great importance to develop sensitive and simultaneous determination method for them with common technologies without highly sensitive instruments. We prepared a new and functional core-shell magnetic nano-material, Fe@Ag@dimercaptobenzene (Fe@Ag@DMB), by a one-step method with sodium borohydride as the reducing agent and transmission electron microscopy (TEM) and energy dispersive spectrometer (EDS) were used for characterisation. The mercapto functional groups on the newly synthesised magnetic nanoparticles could interact with Cd 2+ , Pb 2+ , and Hg 2+ ions in water samples and then efficient extraction for Cd 2+ , Pb 2+ , and Hg 2+ ions was achieved. DDTC-Na solution was a good elutent for elution of these ions from Fe@Ag@DMB nanoparticles . Based on these, a sensitive method was developed for simultaneous preconcentration and determination of the aforementioned ions using magnetic Fe@Ag@DMB nanoparticles as the magnetic solid phase extraction adsorbent prior to high performance liquid chromatography coupled with variable wavelength detection. Under the optimal conditions, the detection limits of the three metal ions were in the range of 0.011–0.031 μg L −1 , and precisions were below 2.37% (n=6). The proposed method was evaluated with real water samples, and excellent spiked recoveries achieved indicated that the developed method would be a promising tool for monitoring these heavy metal ions in water samples.
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BIOSENSORS & BIOELECTRONICS
·
2012
·
IF 5.602
Yuan-Ting Li,Lu-Lu Qu,Da-Wei Li,Qi-Xia Song,Farkhondeh Fathi,Yi-Tao Long
A disposable Ag–graphene sensor was developed for rapid and sensitive in-situ detection of polar antibiotics in water using electrophoretic preconcentration (EP) and surface-enhanced Raman spectroscopy (SERS). The Ag–graphene sensor was fabricated by depositing Ag–graphene nanocomposites synthesized through a facile one-pot method on the disposable screen-printed electrodes (SPEs) and characterized by transmission electron microscopy (TEM) and atomic force microscopy (AFM). SERS properties and detection applicability of the developed sensor were systematically investigated. It is shown that the polar antibiotics can be selectively adsorbed on the oppositely charged sensors after applying different potentials during the EP procedure, and the SERS signals of antibiotics with an effective amplification can be achieved with proper time of preconcentration. Moreover, the Ag–graphene sensor could facilitate the molecule adsorption through weak π–π interactions between graphene and antibiotics, further improving the sensitivity of SERS detection. Under the optimum EP conditions, the representative SERS spectra of a mixed solution containing four different antibiotics can be obtained within 10 min, and each antibiotic is easily distinguished by its characteristic peaks with a sub-nM detection level. The results demonstrate that the proposed disposable Ag–graphene sensor based on EP–SERS can be used for rapid and sensitive in-situ detection of polar antibiotics in aqueous samples without a pre-separation step.
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Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 47
·14963-14972
·
IF 0
Zhifeng Jiang,Xiaomeng Lv,Deli Jiang,Jimin Xie,Danjun Mao
Extending the UV response of anatase TiO2 photocatalysts into the visible light range can play a pivotal role in promoting the practical applications of these catalysts. Nitrogen and carbon co-doped, silver loaded anatase TiO2 (Ag@NC–TiO2) single-crystal nanosheets dominated by {001} facets were prepared for the first time using leaves as the nitrogen and carbon source by a facile, low cost method. The size of the Ag particles on NC–TiO2 nanosheets can be tuned from 1.5 nm to 15 nm using a photo-reduction strategy. The synthesized Ag@NC–TiO2 nanosheets show higher photocatalytic activity in the photodecomposition of organic pollutants compared to NC–TiO2, TiO2 and P25 under visible light irradiation. The enhanced photocatalytic efficiency was ascribed to a synergistic effect between N, C and Ag. In addition, the formed Ag@NC–TiO2 heteronanosheets are highly dispersible in aqueous solution and are capable of efficient catalysis for the reduction of p-nitrophenol. The present synthesis gives a promising method of forming non-metal co-doped, metal nanoparticles (NPs) loaded anatase TiO2 with dominant {001} facets and for broad applications in catalysis and photocatalysis.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Yong Wang,Shikai Xue,Yuhao Liao,Haiyan Wang,Qiujun Lu,Ningli Tang,Fuyou Du
In this study, Ag/Bi 2 O 3 /Bi 5 O 7 I with s-scheme heterostructures were successfully synthesized in situ by nano-silver modification of CUA-17 and halogenated hydrolysis.The growth rate of Bi 2 O 3 crystals was effectively controlled by adjusting the doping amount of Ag, resulting in the formation of a facet-coupling heterojunctions . Through the investigation of the microstructure and compositional of catalysts, it has been confirmed that an intimate facet coupling between the Bi 2 O 3 (120) facet and the Bi 5 O 7 I (312) facet, which provides robust support for charge transfer. Under visible light irradiation, the AgBOI.3 heterojunction photocatalyst exhibited an outstanding degradation rate of 98.2% for Bisphenol A (BPA) with excellent stability. Further characterization using optical, electrochemical, impedance spectroscopy, and electron spin resonance techniques revealed significantly enhanced efficiency in photogenerated charge separation and transfer, and confirming the s-scheme structure of the photocatalyst. Density functional theory calculations was employed to elucidate the mechanism of BPA degradation and the degradation pathway of BPA was investigated by LC-MS. Finally, the toxicity of the degradation intermediates was evaluated using T.E.S.T software.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Cunjin Wang,Taofeng Zhang,Weiming Xue,Yanyan Zhao,Jun Fan
In this study, we successfully synthesized Cu-Ag alloy nanoclusters (CuAgCs) by introducing Ag, which exhibited superior stability compared to Cu nanoclusters (CuNCs). Additionally, carbon quantum dots (CQDs) with an impressive quantum yield of 26% were prepared. By combining short-wavelength CQDs with long-wavelength CuAgNCs, ratiometric fluorescent probes capable of dual emission with peaks at 468 nm (F 468 ) and 560 nm (F 560 ) were developed for detecting L-cysteine (L-Cys). The detection mechanism involves the aggregation-induced emission enhancement (AIEE) effect of CuAgNCs in the presence of L-Cys, resulting in an increase in F 560 while F 468 remains unchanged. The fluorescence intensity ratio F 560 /F 468 exhibits a linear relationship with L-Cys concentration in the range of 0–60 μM, with a low detection limit of 0.367 μM. Notably, the practical applicability of the fluorescent probe was validated through successful detection in real samples, achieving a high recovery rate of 98.7%-109%. These results demonstrate the promising potential of the developed fluorescent probe for practical applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jiayi Meng,Yamei Huang,Yifan Liao,Quanmei Zhou,Yuchen Wei,Xinglin Wang,Linlin Gao,Wei-Lin Dai
Covalent organic frameworks (COFs), characterized by efficient light absorption and highly tunable electronic structures, exhibit substantial promise for photocatalytic hydrogen peroxide (H 2 O 2 ) production. To solve the problem of severe photogenerated carrier recombination, the researchers proposed to construct step-scheme (S-scheme) heterojunctions by combining COFs with metal sulfides (MS) to achieve effective separation and directional transfer of photogenerated electrons and holes. Herein, we deposited a bipyridine-linked COF (TpBpy) onto Ag-doped zinc indium sulfide (Ag-ZnIn 2 S 4 , denoted as Ag-ZIS) nanoflowers to construct an S-scheme heterojunction for photocatalytic H 2 O 2 production. Employing room-temperature cation exchange engineering, atomic-level modulation of the ZIS lattice is achieved under mild conditions, inducing tunable bandgap narrowing and a red-shifted visible light absorption edge. Ag doping promotes the formation of S-scheme heterojunction and further optimizes the built-in electric field. The construction of the S-scheme heterojunction, which involves strong electronic coupling at the contact interface between Ag-ZIS and TpBpy COF, significantly reduces the recombination rate of photogenerated carriers, enhances charge transfer efficiency, and forms an efficient electron transfer channel. The optimized photocatalyst, Ag-ZIS/TpBpy COF-2 (denoted as AZC-2) exhibited excellent photocatalytic activity from pure water, with H 2 O 2 yield reaching 4425 μmol·g −1 ·h −1 . This study highlights the great potential of ion doping strategies for advancing MS/COF-based S-scheme heterojunctions in solar-driven H 2 O 2 synthesis.
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TALANTA
·
2025
·
IF 6.1
Ao Chen,Yiwen Gui,Kuang Luo,Ning Cai,Jumei Li
In this study, a novel magnetic composite, Ag@Fe 3 O 4 /UiO-66-NH 2 (Ag@FUN), was developed by incorporating a porous metal-organic framework (MOF), UiO-66-NH 2 , which offers selective enrichment capabilities and facilitates solar-driven photoreduction of Cr(VI). The surface coverage of silver nanoparticles on Ag@FUN was precisely controlled by adjusting the AgNO 3 feed concentration, enabling tunable SERS sensitivity. SERS measurements revealed that the Ag@FUN composites exhibited strong signal intensity for Cr(VI), along with excellent signal reproducibility and storage stability. These composites were capable of detecting Cr(VI) at concentrations of as low as 7.81 × 10 -8 M in tap water and 8.89 × 10 -8 M in pond water. The remarkable SERS performance is attributed to the porous MOF structure, which enriches Cr(VI) via Zr–O coordination, electrostatic interactions, and pore-filling effects. Importantly, under simulated sunlight, Ag@FUN effectively reduced Cr(VI) within 70 minutes. The composites also demonstrated outstanding recyclability, retaining their SERS sensitivity and photocatalytic efficiency through five consecutive "detection–reduction" cycles. Overall, the Ag@FUN composites developed in this work exhibit high SERS sensitivity and robust photocatalytic activity, offering significant potential for environmental monitoring and ecological remediation.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Jing Feng,Sheng Yao,Xiaohan Mei,Jiacheng Xie,Xujie Wang,Huitian Zhi,Ruhui Shang,Yingchao Yang,Lei Hu,Zhengquan Yan
To conveniently monitor and remove toxic Hg 2+ and S 2− in food samples, Au Ag quantum-dot nanozyme (Au-Ag@FA QDs) was identified. The strong synergistic effect among folic acid (FA), Ag and Au endowed Au-Ag@FA QDs with superior peroxidase-mimic activity to accelerate 3,3′,5,5′-tetramethylbenzidine (TMB) redox with K m / V max of 0.28 mmol·L −1 /6.40 × 10 −8 mol·L −1 ·s −1 . Trace Hg 2+ or S 2− could selectively alter its peroxidase-like activity and inherent fluorescence performance, with obvious hyperchromic/“turn-on” fluorescent effect for Hg 2+ or hypochromic/“turn-off” one for S 2− . And red-green-blue (RGB) values analyzed from smartphones changed regularly with c Hg 2+ or c S 2− . Under the optimized conditions, Au-Ag@FA QDs were successfully applied for multi-mode UV–vis, fluorescent, and RGB monitoring of Hg 2+ or S 2− in food samples. The detection limits were 7.38 × 10 −7 /5.74 × 10 −8 /4.93 × 10 −6 g·L −1 and 1.99 × 10 −6 /4.48 × 10 −8 /5.79 × 10 −6 g·L −1 respectively. Importantly, over 93.8 % Hg 2+ or 90.5 % S 2− could be removed by simple centrifugal-separation after detection. The selective recognition mechanisms to Hg 2+ and S 2− were also proposed.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Yuan Wang,Lei Feng,Haiyan Zhu,Hongyan Miao,Ying Li,Xuefeng Liu,Gang Shi
The fluorescence intensity of the ring-opened merocyanine (MC) form of spiropyran can be enhanced by metal nanostructures. However, direct contact between spiropyran and the metal results in fluorescence quenching, which will reduce the enhancement amplitude of MC fluorescence. Here, Ag nanoparticles (NPs), a TiO2 dielectric layer, a poly(methyl methacrylate)-spiropyran (PMMA-SP) layer, and Au shell-isolated NPs with SiO2 shells (Au@SiO2) are successively assembled on a Si wafer with micropyramids and nanoholes (Siph). The hierarchical structure of this substrate is similar to insects’ compound eyes with nano- and microstructures, which can reduce the reflection of incident light. Meanwhile, the Au/Ag-coupled plasmonic nanocavities can enhance the intensity of a local electromagnetic (EM) field. In addition, TiO2 and SiO2 layers can avoid the nonradiative energy transfer caused by the direct contact between spiropyan and the metal. Based on the above advantages, the fluorescence enhancement factor (EF) of this substrate is as high as 195, which is the maximum reported so far. Zn2+, Cu2+, and Sn2+ can also be detected on Siph/TiO2/PMMA-SP/Au@SiO2, whose detection limits are 0.054, 0.038, and 0.049 μM, respectively. Furthermore, this substrate can be reused to detect metal ions by taking advantage of the reversible isomerization of spiropyran. The bioinspired substrate has positive significance in improving the fluorescence intensity of MC, and its lack of specific recognition ability for metal ions is expected to be further improved by molecular modification of spiropyran.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Jingying Yang,Mingfei Pan,Xiao Yang,Kaixin Liu,Yang Song,Shuo Wang
In-situ, real-time and sensitive detection of multiple pesticide residues in food is always an important issue in food safety. Herein, a novel multifunctional bead-string like Ag nanowires@zeolitic imidazolate framework-8 (Ag NW@ZIF-8) core–shell nanochains was successfully synthesized and utilized as surface-enhanced Raman scattering (SERS) substrate for in-situ and simultaneous detection of pesticide residues . Due to the microporous framework structure of ZIF-8 shell and the plasmon property of Ag NWs core, the Ag NWs@ZIF-8 composite was demonstrated to have strong adsorption performance and high SERS activity (enhancement factor: 4.6 × 10 7 ). The Ag NWs@ZIF-8 based SERS strategy achieved sensitive detection of two water-insoluble pesticides methylparathion and carbaryl with detection limits as low as 7.6 × 10 −9 M and 5.7 × 10 −9 M, as well as the in-situ detection of multi-pesticide residues on fruits and vegetables with acceptable recovery ranged from 77.4 % to 117.5 %, demonstrating its great potential for in-situ and rapid detection of food contaminants.
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