CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhuxu Xu,Adelakun Moses Erinomo,Zhenhua Dan,Fengxiang Qin,Hui Chang
Accurate and sensitive surface-enhanced Raman scattering (SERS) substrates are urgently demanded for the various analytic techniques. The SERS substrates with multimodal and gradient porous structure, utilized for the Rhodamine 6G (R6G) detection, have been designed and successfully fabricated from the thermal diffusion couples of Al and Cu foils via chemical dealloying. The structural inheritance of the initial microstructure of thermal diffusion couple precursors governs the formation of the final layer-by-layer gradient porous Cu with different characteristic pore sizes and morphology. An outmost surface layer of disordered lipstick-like porous structure on the SERS substrates enhances SERS effects as has been expected. The SERS activity of R6G Raman probes on gradient porous Cu is evaluated as a SERS enhancement factor of 6.63 × 10 12 and limit of detection of 2.10 × 10 −17 mol/L, higher than other porous SERS substrates. Meanwhile, the present SERS substrates are flexible and exhibit good bending properties due to the unreacted Cu layer as a supporting skeleton and other gradient porous Cu layers. The superior SERS performances are considered to result from the synergetic effects of the surface scattering of porous Cu rods and enhancements of the high electromagnetic fields between the small gaps between the nanopores.
研究领域:
材料科学
·
分析化学
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产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 12
·3196
·
IF 5.076
Jihua Xu,Jinmeng Li,Guangxu Guo,Xiaofei Zhao,Zhen Li,Shicai Xu,Chonghui Li,Baoyuan Man,Jing Yu,Chao Zhang
The focusing field effect excited by the cavity mode has a positive coupling effect with the metal localized surface plasmon resonance (LSPR) effect, which can stimulate a stronger local electromagnetic field. Therefore, we combined the self-organizing process for component and array manufacturing with imprinting technology to construct a cheap and reproducible flexible polyvinyl alcohol (PVA) nanocavity array decorating with the silver nanoparticles (Ag NPs). The distribution of the local electromagnetic field was simulated theoretically, and the surface-enhanced Raman scattering (SERS) performance of the substrate was evaluated experimentally. The substrate shows excellent mechanical stability in bending experiments. It was proved theoretically and experimentally that the substrate still provides a stable signal when the excited light is incident from different angles. This flexible substrate can achieve low-cost, highly sensitive, uniform and conducive SERS detection, especially in situ detection, which shows a promising application prospect in food safety and biomedicine.Keywords:surface-enhanced Raman spectroscopy;localized surface plasmon resonance;flexible SERS substrate;cavity
研究领域:
材料科学
·
纳米技术
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分析化学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Xinqi Zheng,Zixi Huang,Pengran Guo,Wanzhu Zhou,Peishan Wu,Yanpin Zhao,Jingwei Xu,Jian Sun,Yongqian Lei
Flexible surface-enhanced Raman scattering (SERS) substrates have driven much attention in Raman detection of environmental pollutants due to their unique advantage of sensitivity, low-cost and fast sampling. However, it is still a high challenge for fabricating flexible SERS substrate with high reproducibility and sensitivity. In this study, we developed a novel silver nanoparticle assembly method based on vortex evaporation method to batch assemble multiple silver ring (SR) SERS substrate array on a parafilm. The flexible SR SERS substrates were uniformly covered with active silver nano-islands, which significantly improved the Raman signal intensity of the targets by 126 folds and showed 5 times Raman enhancement compared with the common SERS substrate by direct evaporation method, and also represented the unique bending response properties of flexible substrate. The Raman detection for sulfonamide residues in water with SR SERS substrate represented high sensitivity, which limits of detection for Sulfapyridine and Sulfacloropyridazine were 9.46 and 9.3 × 10 −8 mol/L, respectively. The quantitative relationships were obtained in wide linear range of 4 orders with good accuracy and stability. The flexible SR SERS substrate array can be large-scale prepared with good repeatability, stability, and low-cost, which has promising applications for trace contaminants detection in water environment.
研究领域:
分析化学
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环境科学
·
材料科学
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产品关联
DOI
高影响因子
LASER PHYSICS LETTERS
·
2018
·Vol. 15
·期 5
·055701
·
IF 2.235
Xi Liu,Meizhen Huang,Jie Chen,Lili Kong,Keihui Wang
A simple method, based on a roll-to-roll ultraviolet micro-pyramid imprinting technique and a nanoparticle self-assembling process in aqueous solution, to fabricate a large-area, flexible surface-enhanced Raman scattering (SERS) polyethylene glycol terephthalate substrate is proposed. The SERS substrate is demonstrated to be of high sensitivity. The detection concentration of Rhodamine 6G (R6G) measured by a portable Raman spectrometer is down to 10−9 mol l−1. The relative standard deviation values of different spots and different substrates are less than 13%. In addition, the feasibility for rapid detection of dye in herbal tea based on this SERS substrate and a portable Raman spectrometer is investigated. Three industrial dyes are employed to simulate the dyeing process. It is presented that R6G of 4.8\times {{10}^{-7}} g ml−1, malachite green of 10−6 g ml−1 and Auramine O of 10−6 g ml−1 in herbal tea could be detected rapidly. The experimental results imply that this method could be potentially applied in the field of dyed herbal tea detection.
研究领域:
分析化学
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材料科学
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食品安全
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Siyuan Zheng,Hao Liu,Zhaohao Wei,Rui Hu,Kang Cheng,Xi Bian,Wei Wang,Le Wang,Yongchao Lai
Surface-enhanced Raman spectroscopy (SERS) is a highly sensitive analytical technique with great potential for application in surface screening due to its outstanding molecular detection capabilities. However, conventional flexible SERS substrates encounter challenges related to high intrinsic Raman background and low thermal conductivity. In this paper, a novel all-metal flexible SERS substrate (MF-SERS) with uniform plasma nanostructures, high SERS performance, low intrinsic Raman background, and excellent thermal conductivity was prepared by means of wet chemistry using commercially available copper foil as support material. The multifaceted MF-SERS has been demonstrated to expedite the screening of surface contaminants (e.g., pesticide residues) across diverse substrates, including fruits, slides, metal mobile phone housings, and plastic food packaging. This offers a robust solution for expeditious surface screening and sheds light on the development and application of new analytical methods.
研究领域:
分析化学
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纳米技术
·
传感器与检测
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环境监测
·
食品安全
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Guojun Weng,Jianming Yang,Jianjun Li,Jian Zhu,Junwu Zhao
Surface-enhanced Raman scattering (SERS) based on rigid substrates has been widely used in biomedical detection due to its high sensitivity and specificity. However, the tedious operation steps for preparing SERS rigid substrates limited their applications in real-world detection. Compared with general rigid substrate, the flexible substrate has the advantages of simple preparation and easy portability, which are suitable for rapid, wearable and personalized detection in the field of point-of-care test. Herein, the flexible SERS substrates employing copolymer were fabricated and used for detection of skin cortisol, a biomarker for evaluating psychological stress in sweat. Silver triangle nanoplates with sharp corner were used as enhanced particles, and transferred to polyvinyl chloride/styrene-ethylene-butene-styrene copolymer (PVC/SEBS) film through three-phase interface self-assembly. By adjusting the size of silver nanoparticles, the ratio of PVC to SEBS in the polymer film, and the number of transfers of self-assembled silver films, the enhancement effect of the flexible SERS substrate was maximized. In addition, functionalization of the flexible SERS substrate with cortisol antibodies is used to achieve specific detection of cortisol on the skin surface. Under the optimal conditions, the Raman peak intensities at 1268 and 1500 cm −1 of the cortisol had a good linear relationship with the logarithm of its concentration in the range of 10 −7 to 10 −3 M, and the detection limits were 5.47 × 10 −8 M and 5.51 × 10 −8 M, respectively. The flexible silver triangle nanoplates SERS substrate constructed by self-assembly in the three-phase interface has the characteristics of good specificity and high sensitivity, which has potential for transdermal cortisol wearable detection, providing a feasible method for the rapid evaluating psychological stress level.
研究领域:
生物医学工程
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分析化学
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材料科学
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可穿戴技术
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产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 40
·405501
·
IF 3.953
Tianxun Gong,Haonan Li,Guilin Wang,Fang Guan,Wen Huang,Xiaosheng Zhang
We propose an anti-scratch flexible surface-enhanced Raman scattering substrate with arrayed nanocavity microstructures fabricated by colloidal lithography. The nanocavity microstructure of the substrate can well protect the inner gold nanoparticles during wipe sampling. The prepared flexible substrate was able to detect 4-aminothiophenol (4-ATP) with a concentration down to 1 fM. Furthermore, the substrate was used to detect 6-BA residues on the surface of apples and bean sprouts through wipe sampling, which shows great potential in the field of rapid on-site detection, especially in the detection of pesticide residues on the surface of fruits and vegetables.
研究领域:
材料科学
·
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Hui Zhang,Xia Deng,Junrong Fu,Ye Chen,Shiwei Jin
Surface-enhanced Raman scattering (SERS) has been widely applied in the field of food safety due to its exceptional molecular recognition capabilities. In this study, a simple method for preparing a flexible SERS substrate was designed for the ultrasensitive real-time detection of the banned drugs malachite green (MG) and crystal violet (CV). The substrate was prepared by patterned spraying of a superhydrophobic coating prepared from candle soot onto the surface of a poly(vinyl alcohol) (PVA) sponge, followed by simple Ag nanoparticle (Ag NP) deposition in the superhydrophilic region. The PVA sponge with special hydrophilicity can completely absorb the droplets to be measured within 1–5 s without additional drying treatment. And the Ag NPs aggregated by potassium iodide (KI) resulted in a significant enhancement of the Raman signal, enabling the substrate to realize the detection of MG and CV as low as 100 fg/mL (2.74 × 10–13 M) and 1 pg/mL (2.45 × 10–12 M), respectively, with a long lifetime (90 days). Thanks to the excellent mechanical properties of the flexible substrate, the substrate can realize the simultaneous detection of very small amounts of MG and CV on the surface of crayfish by simple wiping, which has great application prospects in the field of food safety and field inspection.
研究领域:
分析化学
·
材料科学
·
食品安全
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）