SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Binbin Nie,Yuanyuan Luo,Jianping Shi,Lei Gao,Guotao Duan
This article presented a facile and productive method to prepare a bowl-like pore array composed of hollow Au/Ag alloy nanoparticles (Au/Ag BPHAN array). It was found that Au/Ag BPHAN array showed the great SERS activity in the detection of melamine molecule. The experimental results for 10 −5 M melamine solution indicated the SERS intensity was about five times larger than that of Ag or Au samples when the ratio of Au to Ag was close to 1:1. Especially, the detection limit was 10 -9 M which was one order of magnitude lower than the reported value in references. SERS enhancement mechanism was the surface plasmon resonance in the alloy nanoparticles as presented in the simulation results by FDTD. To test the performance of the BPHAN arrays in real food samples, the melamine intentionally added to the milk powder was detected. The results showed that the SERS peaks assigned to melamine were very clear and the detection limit was already low to 0.1 ppm, 10 times lower than the tolerance level in infant milk products imposed by FDA of U.S. and 1.5 times lower than the strictest standards in the world, proposed by the Codex Alimentarius Commission in 2012. As far as we know, this was the highest sensitivity record of melamine in solid milk powder by SERS detection.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Rongyang Liu,Li Jiang,Zizhen Yu,Xufeng Jing,Xiu Liang,Dan Wang,Bo Yang,Chengxing Lu,Wei Zhou,Shangzhong Jin
Recent years, two-dimensional transition metal carbonitrides, MXene, have emerged as SERS substrates due to their unique optical and electrical properties. In order to combine the advantages of metal nanoparticles and MXene for SERS substrates, this paper prepared an MXene (Ti 3 C 2 T x ) -Ag nanoparticles (NPs) hybrid biosensor through in-situ electrostatic self-assembly method, in which the citrate-coated Ag NPs are loaded on the negatively surface of Ti 3 C 2 T x flakes through positively charged PDDA polymer. The characterizations show that a large number of Ag NPs uniformly adsorb on both side of Ti 3 C 2 T x nanosheets. The prepared platform exhibits excellent SERS performance, long-term stability and good uniformity by detecting 4-MBA molecules. The electromagnetic field distribution was simulated to theoretically show the Raman enhancement mechanism of this platform. In order to explore the possible application of the sensor in clinical diagnosis and monitoring of biological environment, the platform was used for biomolecule detection. The detection limit of adenine molecules can be as low as 10 −8 M. For dopamine molecules with concentration ranging from 5 × 10 -6 M to 5 × 10 −8 M, the SERS results show a linear relationship between peak intensity and concentration of dopamine molecules. The biosensor was applied for serum detection. The results suggest that MXene-PDDA-Ag NPs hybrid platform could be used as a sensitive and uniform biosensor for label-free quantitative detection of bio-molecular based on SERS method, which could be applied in the field of biotechnology.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Bin Shang,Yanbing Wang,Peng Yang,Bo Peng,Ziwei Deng
Surface-enhanced Raman scattering (SERS) sensor allows for fingerprinting and label-free molecular detection with a high sensitivity, but the simple fabrication of SERS active substrates with a well-control over the SERS performance, e.g. an ultra-high sensitivity, superior reproducibility and long-term stability remain a great challenge. Here, we introduce an easy strategy for synthesizing polydopamine-Ag microbowl/nanoparticle array (PDA-Ag MNA) substrates with a tunable superhydrophobic surface, applicable for ultra-highly sensitive SERS detection. First, the periodically dented PDA films are prepared by polymerizing dopamine onto 2D polystyrene colloidal crystals formed at the liquid/air interface, and followed with an in-situ reduction of Ag ions to Ag nanoparticles after removing polystyrene. The surface morphology, i.e. microbowl/nanoparticle structure, is well-controlled, therefore, allowing that the SERS activity of the substrate is under control. Inspired by the superhydrophobic hierarchical surface of the rose petals, this analogous MNA surface is subsequently endowed to be superhydrophobic. This way, the SERS detection of ultra-dilute solute (10 −14 M) can be achieved by concentrating analytes within a localized region. Moreover, this substrate also shows a superior reproducibility in result and durability in use. This strategy exhibits a realistic paradigm for further improving the sensitivity of the SERS technique.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2011
·
IF 3.068
Jingpeng Yuan,Yongchao Lai,Junling Duan,Quanqin Zhao,Jinhua Zhan
A mono-6-thio-β-cyclodextrin-modified silver film was synthesized via galvanic displacement on copper foil. The prepared silver films could enrich non-polar polychlorinated biphenyls (PCBs) molecules from hydrophilic phase using thiolate β-cyclodextrins (SH-β-CDs) as receptors. The components of as-prepared Ag-coated-Cu (Ag–Cu) film were confirmed by powder X-ray diffraction (XRD). Both surface-enhanced Raman spectroscopy (SERS) and energy dispersive X-ray spectroscopy (EDS) measurements gave strong evidences that the thiolated β-cyclodextrins (SH-β-CDs) had been immobilized on the surface of silver film. Compared to the substrates prepared in the absence of SH-β-CD, the surface morphology of the CD-modified Ag films was obviously changed. The interfacial enrichment and the capability of substrates to form inclusion complexes with PCBs molecules were tested by using PCB-15 (4,4′-dichlorobiphenyl) as the probe molecules via SERS technique. The measured SERS spectra could distinguish the PCB-15 molecules at micro-molar level according to the most intense CCC bending in-plane mode of PCBs. The enhancement factor (EF) of the SERS substrates for PCB-15 was 1.2 × 10 5 , which was comparable with a number of previous reports.
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MATERIALS TECHNOLOGY
·
2016
·
IF 1.442
G. X. Chen,Y. Y. Chen,Y. Y. Cui,Q. F. Chen,T. Chen,Y. Yang
To meet an increasing market demand of conductive ink which is applicable to wide range of substrates, ultraviolet (UV) curing technique combined with nano-silver materials was used to fabricate UV electric conductive ink. Firstly, both silver nano-particles (AgNPs) and silver nano-wires (AgNWs)/poly (vinyl pyrrolidone) (PVP) composites were synthesized. An ethanol solution-phase approach using hydrazine hydrate as a reducing agent was presented for an easy synthesis of large-scale AgNPs with an average diameter of 35 nm. AgNWs with diameter of 40 nm and length up to over 10 μm were synthesized by polyol method. In AgNWs synthesis process, the main influencing factors such as the molar ratio of PVP to silver nitrate, the reaction time and PVP of different degree of polymerization were investigated. Finally, nano Ag/PVP composites, polyurethane acrylate, photoinitiator 1173 and solvents were used to fabricate UV electric conductive ink, which had an electrical conductivity on paper as high as 2.1 × 105 S/m.
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高影响因子
LANGMUIR
·
2022
·
IF 4.331
Shenjie Li,Xiaoyu Gong,Zhiqiang Li,Minghui Yu,Yanyan Chen,Hao Yu,Shuang Wang,Hongyu Shao,Minghao Dou,Yuye Cheng
A novel interfacial reaction nucleation mechanism for the preparation of water-soluble Ag–In–S quantum dots (AIS QDs) was proposed in which interfacial acid regulates the concentration of hydroxide ions outside the complex and sulfur sources attack cations at the interface of the complex, covalent bonds between cations and sulfur sources are formed at the interface of the complex, and the nucleation and growth of crystals is finished at room temperature. By bypassing the heating process normally necessary for crystal nucleation and growth, AIS QDs can be produced on a large scale under simple, mild conditions. At the same time, the characteristics of this mechanism enable AIS QDs to be directly synthesized in an organic pollutant solution. This study represents a significant advance in the mechanism of crystal synthesis and contributes to the photocatalytic decomposition of organic pollutants from theory to practice.
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高影响因子
RSC Advances
·
2024
·Vol. 14
·期 9
·6048-6057
·
IF 3.9
Hu Sun,Xianglei Yu,Siqi Quan,Weichao Li,Zhuo Qian,Junpeng Li,Guoyou Gan
Environmental protection mandates have spurred the widespread adoption of lead-free glass in electronic material adhesion. Glass powder, crucial for solar silver paste, notably affects the ohmic contact at the Ag–Si interface of crystalline silicon solar cells. This study examines how TeO2 content influences the high-temperature flowability and wettability of lead-free Bi2O3–TeO2-based glass powder, alongside the interplay between the glass's thermal properties and interface contact. Additionally, it investigates the Bi2O3–TeO2 ratio's impact on current transmission through the interfacial glass layer. Experimental results show that the synthesized glass powder exhibits superior high-temperature flowability and wettability, with a low contact resistance of 1.5 mΩ cm2 in silver paste applications. This study also proposes an optimal approach for enhancing current transmission through the interfacial glass layer. Consequently, this glass powder is highly valuable for c-Si solar cell silver paste applications, offering novel insights into improving current transmission efficiency.
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高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 6
·3729-3743
·
IF 5.7
Zhang Cuizhi,Gao Kairu,Chu Xiaomeng,Liu Shaojie,Li Peixin,Tang Erjun
Polyamidoamine (PAMAM) encapsulated nano-Ag is a highly efficient catalyst for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in water. However, PAMAM is easily soluble in water, making the nano-Ag catalyst difficult to recycle. In this work, carboxymethyl cellulose (CMC) was oxidized by sodium periodate to obtain oxidized carboxymethyl cellulose (CMC-CHO) containing aldehyde groups. PAMAM encapsulated nano-Ag (G4.0-PAMAM-Ag) was prepared with G4.0-PAMAM as template. Through the Schiff base reaction between CMC-CHO and G4.0-PAMAM-Ag, the CMC/PAMAM hydrogel loaded with nano-Ag (CMC-PAMAM-Ag) was prepared. The catalytic performance of CMC-PAMAM-Ag in the reduction of 4-NP to 4-AP in water was studied. It was found that its time required for accomplishing the reduction reaction was only 9 min, similar to that of free G4.0-PAMAM-Ag (8 min). Turnover frequency was as high as 169 h −1 , much higher than that of the cellulose/PAMAM composite supported nano-Ag (4.2 h −1 ) and dextrann/PAMAM hydrogel supported nano-Ag (40.2 h −1 ). The recovered hydrogel was characterized by X-ray photoelectron spectroscopy and it was found that the imine bonds in the fresh hydrogel were reduced to the amine bonds in the recovered hydrogel, improving the stability of hydrogel. The recovered hydrogel still had a good catalytic performance.
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Canadian Journal of Chemistry
·
2018
·Vol. 97
·期 2
·
IF 1.084
Tian Gan,Zhikai Wang,Mengru Chen,Wanqiu Fu,Haibo Wang,Junyong Sun
In this work, the Ag@Cu particles with yolk–shell nanostructure was prepared by facile solvothermal method, which was modified on glassy carbon electrode (GCE) to fabricate electrochemical sensor for the convenient and fast determination of p-aminobenzoic acid (PABA). The surface morphology and electrochemical properties of the as-prepared Ag@Cu nanocomposite modified electrode were characterized by scanning electron microscopy, transmission electron microscopy, chronocoulometry, and electrochemical impedance spectroscopy. Further, the electrochemical sensing of PABA was performed on the Ag@Cu/GCE using cyclic voltammetry and differential pulse voltammetry techniques, showing high catalytic activity. Under the optimal conditions, the sensor exhibited a wide linear range, high sensitivity, and low detection limit of 0.315 μmol/L for PABA. The developed sensor was also successfully applied for PABA detection in anesthetic and cosmetics with satisfactory results.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Lina Dai,He Wang,Yanduo Liu,Liru Cui
Direct light-driven methane selective conversion into useful chemicals remains a major challenge due to the need for photocatalysts with high photoactivity and selectivity in activating inert C-H bonds. In this study, we have developed highly photoactivity and selective photocatalytic CH 4 oxidation into C 2 H 6 using Ag-Mg tandem sites co-modified ultrathin ZnO hybrid photocatalysts in a flow reactor. Our system achieves an C 2 H 6 production rate of over 1860 μmol/g/h with 93 % selectivity, which is significantly higher than the efficiency of state-of-the-art photocatalytic systems. Various in-situ characterizations and theoretical studies reveal that the Ag-Mg tandem sites co-modified leads to enhanced photogenerated charge separation efficiency, while maintaining high ethane production rate owing to the strong selective adsorption capacity for methane and oxygen of the doped Mg sites and oxygen vacancy. Furthermore, the Ag nanoparticles cocatalyst can facilitate the removal of activated CH 4 in the form of methyl radicals in the gas phase, thereby promoting C 2 H 6 formation and inhibiting CH 4 overoxidation to produce CO 2 . Overall, these findings provide novel insights into the photocatalytic conversion of CH 4 on Ag/Mg-ZnO. These results offer valuable possibilities for developing more effective catalysts for the conversion of CH 4 to higher value-added products.
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Qing Yang,Hongbin Pu,Da-Wen Sun
The sensitive detection of quinalphos in food is crucial due to its improper use and the potential for serious harm. Surface-enhanced Raman spectroscopy (SERS) technology, provides a new way for rapid and ultra-sensitive detection. To exploit the molecular sieving effect of metal-organic frameworks (MOFs) in mitigating interference from food matrix components during pesticide residue detection, a novel chiral spiny L-Au@Ag@ZIF-8 (L-AAZ) three-layer core-shell composite was developed as an effective SERS substrate, with chiral L-AABPs providing abundant “hot spots” and spiny ZIF-8 shell provides excellent absorption properties, causing a five-fold increase in SERS intensity compared to traditional Au@Ag NPs. The experimental results revealed that L-AAZ achieved a high enhancement factor (EF) of 3.15 × 10 5 , a low limit of detection (LOD) of 6.56 × 10 −10 M, and a relative standard deviation (RSD) of 14.6 % for malachite green (MG), indicating its superior SERS sensitivity and consistency. Moreover, it demonstrated stable performance, maintaining good storage stability for up to 55 days. The substrate's suitability for the actual fruit sample (tangerine) was confirmed, showing an LOD of 10 ng/mL, demonstrating its capability for rapid and sensitive detection of trace amounts of pesticide residues in food.
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Huaze Shao,Hong Yan,Qing Tang,Shiquan Zheng,Hanren Chen,Lihong Liu
The overexpression of human epidermal growth factor receptor 2 (HER2) has been linked to aggressive breast cancer and worse clinical outcomes. However, accurately measuring HER2 remains challenging, due to its low serum content. Herein, we developed a novel method for HER2 detection in serum by the combination of aptamer with C-Ag + -C structure, Ag + -released hybridization chain reaction (Ag + -HCR) and coprecipitation of Ag + and gold nanoparticles (AuNPs) in the solution including Eosin Y (EY) and AgI colloids. Following the aptamer bound to HER2, signal amplification occurred through the release of numerous Ag + by Ag + -HCR. This process subsequently induced AuNPs aggregation on the surface of AgI colloids, resulting in reduced fluorescence intensity of EY in the supernatant. The reduced value of EY fluorescence intensity in the supernatant was proportional to the level of HER2. Under optimized reaction conditions, a wide detection range was obtained between 0.09 and 9000 pg/mL with a limit of detection of 11.7 fg/mL in diluted human serum, and 96 serum samples in a 96-well plate could be measured simultaneously by a microtiter plate reader within 2 h. Moreover, the quantitative results of HER2 were consistent with those obtained using the enzyme-linked immunosorbent assay kit ( r = 0.9995). Therefore, leveraging the delicate design of Ag + -HCR signal amplification, this enzyme-free, label-free, and effective method has demonstrated to be capable of detecting HER2 in serum due to its high sensitivity. Remarkably, this method may be extended to detect other cancer-related proteins and genes by replacing the corresponding target sequences.
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