SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Xuejiao Wang,Xupeng Zhu,Yufeng Tao,Erjin Zhang,Xudong Ren
Pesticide residues threaten the ecological environment and human health. Therefore, developing high performance SERS substrate to achieve highly sensitive detection of pesticide residues is meaningful. In this study, based on the strategy of combining “hot spots” engineering and material hybridization, we construct a novel hybrid SERS substrate by depositing Ag nanoflowers (NFs) on ZnO nanorods (NRs). Benefiting from the synergistic effect of electromagnetic enhancement and charge transfer effect, the Ag NFs@ZnO NRs substrate exhibits a low detection limit (10 −13 M) for crystal violet molecules. This SERS substrate has good uniformity with a relative standard deviation of 7.463 %. Besides, owning to the photocatalytic property of ZnO NRs, the hybrid substrate can degrade probe molecules after SERS detection and realize recyclability. As a demonstration, we employed our SERS substrate for the trace detection of pesticide residues on apple surface and in river water. This study provides a new idea for improving the SERS performance of hybrid substrates.
研究领域:
材料科学
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环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Yu-fang Fu,Jian Zhu,Xin Li,Guo-jun Weng,Jian-jun Li,Jun-wu Zhao
In this work, we synthesized Au-Ag alloy nano-garlands with multiple petal-like branches and internal cavities in two steps. First, we etched silver nanospheres with HAuCl 4 to obtain Au-Ag alloy nanoshells with different shell layer thicknesses and hollow core sizes. After that, based on different nanoshells, 4-NTP was used as a shape-directing agent, HAuCl 4 and AgNO 3 as precursor raw materials, and AA as a reducing agent for the growth of petals to form Au-Ag bimetallic nano-garlands with multi-branching structure. The regulation of the branching morphology of the nano-garlands could be achieved by changing the amounts of 4-NTP and HAuCl 4 . The SERS activity of the nano-garlands could be further improved by changing the AA concentration, the size of nanoshells, and the Au/Ag ratio of the precursor raw materials. Because the bimetallic nano-garlands have hollow cavities and petal-like branches, there are couplings between the cavities and the branches, between the adjacent branches, and between the metals inside and outside of the cores, which can achieve a good enhancement of SERS. The highest SERS enhancement factor of Au-Ag bimetallic nano-garlands can reach 4.47×10 8 , which can be used as a good candidate for SERS substrate for the trace detection of biomolecules , pesticides, and other substances.
研究领域:
材料科学
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纳米技术
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2022
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IF 10.383
Hao Zhang,Dongzhi Zhang,Bao Zhang,Dongyue Wang,Mingcong Tang
Recently, wearable sensors and electronic skin systems have become prevalent, which can be employed to detect the movement status and physiological signals of wearers. Here, a pressure sensor composed of mesh-like micro-convex structure polydimethylsiloxane (PDMS), MXene nanosheet/Ag nanoflower (AgNF) films, and flexible interdigital electrodes was designed by layer-by-layer (LBL) assembly. The unique microstructure of PDMS effectively increases the contact area and improves sensitivity. Moreover, AgNFs were introduced into the MXene as a “bridge,” and the synergistic effect of the two further enhanced the performance of the sensor. The pressure sensor has high sensitivity (191.3 kPa–1), good stability (18,000 cycles), fast response/recovery time (80 ms/90 ms), and low detection limit (8 Pa), so it can be used for all-round monitoring of the human body. Sensing arrays were integrated with a wireless transmitter as an intelligent artificial electronic skin for spatial pressure mapping and human–computer interaction sensing. Moreover, we develop a smart glove by a simple method, combining it with a 3D model for wireless accurate detection of hand poses. This provides ideas for hand somatosensory detection technology, leading to health monitoring, intelligent rehabilitation training, and personalized medicine.
研究领域:
生物医学工程
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材料科学
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传感器技术
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
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2024
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IF 5.7
Xuejiao Wang,Jiayi Dai,Xupeng Zhu,Xueyan Liu,Yufeng Tao,Erjin Zhang,Xudong Ren
The presence of hazardous substance in river water poses a severe threat to both the ecological environment and human health. Therefore, designing and preparing highly sensitive SERS platform for monitoring the hazardous substance is of great significance. Herein, the Ag nanoflowers (NFs)@ZIF-8 core-shell nanocomposite was synthesized and utilized as SERS substrate. Using crystal violet as model molecule, this substrate achieved a detection limit of 10 −10 M and superior uniformity with relative standard deviation of less than 15 %, and the enhancement factor (EF) for crystal violet was calculated about 4.37×10 6 . Besides, the SERS signal only showed a slight attenuation after 3 months storage. As a demonstration, the SERS platform achieved sensitive detection of two hazardous substances thiram and methylene blue with detection limits of 10 −7 M and 10 −8 M. And the recoveries of SERS detection for thiram and methylene blue in river water were between 70 % and 182 %. The electromagnetic enhancement provided by Ag NFs and the enriching effect of ZIF-8 shell collectively contribute to the excellent performance of the Ag NFs@ZIF-8 SERS platform. This work delivers a promising strategy for constructing hybrid SERS platform for highly sensitive detection.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2024
·Vol. 16
·期 14
·2085-2092
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IF 2.7
Yue Liu,Guanwen Su,Wei Wang,Hongyuan Wei,Leping Dang
This study proposes a microfluidic platform for rapid enrichment and ultrasensitive SERS detection of bacteria. The platform comprises ZnO nanoflower arrays decorated with silver nanoparticles to enhance the SERS sensitivity. The ZnO nanoflower array substrate with a 3D reticular columnar structure is prepared using the hydrothermal method. SEM analysis depicts the 3.05 μm gap distribution of the substrate array to intercept the most bacteria in the particle sizes range of 0.5 to 3 μm. Then, silver nanoparticles are deposited on the ZnO nano-array surface by liquid evaporation self-assembly. TEM and SEM analysis indicate nanosize of Ag particles, evenly distributed on the substrate, enhancing the SERS efficiency and improving sensing reproducibility. The probe molecules (R6G) are tested to demonstrate the high SERS activity of the proposed microfluidic sensor. Then, Escherichia coli, Staphylococcus aureus, Enterococcus faecalis, and Bacillus subtilis are selected, demonstrating the sensor's excellent bacterial capture and sensitive recognition capabilities, with a detection limit as low as 102 CFU mL−1. Additionally, the antibacterial properties of ZnO/Ag heterojunction nanostructures are studied, suggesting their ability to inactivate bacteria. Compared with the traditional Au-enhanced chip, the sensor preparation is easy, safe, reliable, and low-cost. Moreover, the ZnO nano-array exhibits a large specific surface area, high interception ability, stronger and uniform SERS performance, and effective and reliable detection of trace pathogens. This work provides potential future ZnO/Ag microfluidic SERS sensor applications for rapid, unlabeled, and trace pathogens detection in clinical and environmental applications, potentially achieving breakthroughs in early detection, prevention, and treatment.
研究领域:
生物医学工程
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分析化学
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微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Chemistry-X
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2025
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IF 8.2
Xiaoyu Yang,Dan Zhou,Xin Yang,Bo Wu,Jiaxin Xie,Runzi Zhang,Yao Liu,Yi He
Diacetyl is a flavoring agent commonly used to enhance food aroma. However, excessive levels can pose health risks, making rapid and sensitive detection crucial for food safety. In this study, multifunctional cobalt oxide tetraoxide@silver nanoflowers (Co 3 O 4 @Ag NFs) were synthesized to enhance the photocatalytic coloration of diacetyl, enabling a simple and highly sensitive colorimetric/SERS dual-channel sensor. Co 3 O 4 @Ag NFs serve three key functions: First, Co 3 O 4 acts as a photocatalyst, improving catalytic efficiency and detection sensitivity. Second, Ag nanoparticles enhance light scattering and reflection, prolonging light interaction with diacetyl molecules and accelerating the reaction. Third, the strong electromagnetic field generated by Co 3 O 4 @Ag NFs creates numerous hotspots, making it an effective and highly sensitive SERS substrate. The sensor achieves detection limits of 10 × 10 −6 mol/L for colorimetric detection and 3.0 × 10 −12 mol/L for SERS, providing a simple, rapid, sensitive, and accurate way for diacetyl detection and offering potential for future food safety analysis.
研究领域:
食品安全
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纳米材料
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分析化学
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传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）