OPTIK
·
2021
·
IF 2.443
Baili Chen,Wei Zhou,Mingshi Zhao,Pengchao Si
Silver nanostructure has excellent surface-enhanced Raman scattering (SERS) properties. However, the influence of the diameter of silver nanowires on the SERS is still unclear. To this end, four Ag NWs with diameters of 20, 25, 31, and 38 nm were designed and fabricated. The effects of diameter on the SERS were studied experimentally and simulated theoretically. The results indicate that the SERS activities of the Ag NWs increase with the diameter within a certain range. The highest EF value is up to 5.0 × 10 9 . These results may provide a reference for the design of high-performance Ag NWs SERS substrates.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2025
·
IF 2.6
Xiulei Xiong,Haihua Shen,Songnan Liu,Fei Rong,Jian Dong
To detect H2O2 and redox potential of an acute wound simultaneously, a SERS-active microneedle was fabricated by integrating H2O2 and redox potential SERS probes in two grooves of an acupuncture needle, respectively. When the SERS-active microneedle was inserted into tissues, an acute wound formed and the two SERS probes were brought into the wound to sense H2O2 and redox potential of the wound. The feasibility of the SERS-active microneedle was evaluated ex vivo and in vivo. Both sugar deficiency and sugar excess induce the increases of H2O2 and redox potential in most tissues. Short-term physiological disturbances eventually returned to normal levels in healthy organisms, and abnormal sugar intakes disrupt the normal physiological environment and induce stress response in all tissues. The SERS-active microneedle for detection of H2O2 and redox potential would become a powerful tool, used for collecting physiological signals in different tissues to elucidate the mechanisms of wound healing and redox-related diseases.
研究领域:
生物医学工程
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分析化学
·
病理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 10
·2383
·
IF 4.2
Zhi Yang,Lu Yang,Yucun Liu,Lei Chen
Surface-enhanced Raman scattering (SERS) is a promising technique for sensitive detection. The design and optimization of plasma-enhanced structures for SERS applications is an interesting challenge. In this study, we found that the SERS activity of MXene (Ti3C2Tx) can be improved by adding Au nanoparticles (NPs) in a simple photoreduction process. Fluoride-salt-etched MXene was deposited by drop-casting on a glass slide, and Au NPs were formed by the photocatalytic growth of gold(III) chloride trihydrate solutions under ultraviolet (UV) irradiation. The Au–MXene substrate formed by Au NPs anchored on the Ti3C2Txsheet produced significant SERS through the synergistic effect of chemical and electromagnetic mechanisms. The structure and size of the Au-decorated MXene depended on the reaction time. When the MXene films were irradiated with a large number of UV photons, the size of the Au NPs increased. Hot spots were formed in the nanoscale gaps between the Au NPs, and the abundant surface functional groups of the MXene effectively adsorbed and interacted with the probe molecules. Simultaneously, as a SERS substrate, the proposed Au–MXene composite exhibited a wider linear range of 10−4–10−9mol/L for detecting carbendazim. In addition, the enhancement factor of the optimized SERS substrate Au–MXene was 1.39 × 106, and its relative standard deviation was less than 13%. This study provides a new concept for extending experimental strategies to further improve the performance of SERS.
研究领域:
材料科学
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 7
·2066-2071
·
IF 1.938
Wei Zhang,Bowei Li,Lingxin Chen,Yunqing Wang,Dingxue Gao,Xuehua Ma,Aiguo Wu
A simple and facile method has been demonstrated to fabricate low-cost surface enhanced Raman scattering (SERS) active microfluidic paper chips using a painting brush. This strategy solves the problem of mass production of highly reproducible SERS substrates without complicated or bulky micro- or nanofabrication instruments. Rhodamine 6G (R6G) was chosen as a probe molecule to evaluate the performance of the SERS active chip. To further demonstrate the possibility of this method's potential application in environmental monitoring, trace malachite green (MG) was successfully analyzed on this chip. The performance of our chips was desirable. The paper substrates with silver nanoparticles deposited by brush were found to be cost-efficient and highly sensitive (LOD for R6G and MG are 1 nM and 10 nM, respectively), and have good reproducibility (∼15% relative standard deviation).
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2013
·Vol. 19
·期 28
·9211-9217
·
IF 5.831
Chuhong Zhu,Guowen Meng,Qing Huang,Yao Zhang,Haibin Tang,Yiwu Qian,Bin Chen,Xiujuan Wang
Graphical SERS up : Parallel face-exposed Ag nanoplates vertically grown on micro-hemisphere surfaces have been prepared by firstly electrodepositing the micro-hemispheres assembled by Ag nanoplates, the planar surfaces of which are stuck together, on indium tin oxide (ITO) substrates, and then Ostwald ripening the as-electrodeposited micro-hemispheres in water (see figure). Ag nanoplates, as two-dimensional plasmonic nanostructures, have attracted intensive attention due to their strong shape-dependent optical properties and related applications. Here parallel face-exposed Ag nanoplates vertically grown on micro-hemisphere surfaces have been achieved by firstly electrodepositing the micro-hemispheres assembled by Ag nanoplates, whose planar surfaces are stuck together, on indium tin oxide substrates, and then Ostwald ripening the as-electrodeposited micro-hemispheres in water. The sizes of the nanoplates and the gaps between the neighboring nanoplates have been tailored by tuning the Ostwald-ripening duration, so that the SERS activity of the micro-hemispheres has been remarkably improved. The improved SERS activity can be well explained by our systematic finite-element simulation. Therefore, Ostwald ripening offers a route to the synthesis of Ag nanoplates, and the optimization of plasmon coupling and SERS activity of nanostructure-assembled systems.
研究领域:
材料科学
·
表面增强拉曼光谱
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xiaolong Fu,Huiying Wu,Zhihong Liu,Pengzhao Wang,Jiefeng Rong,Fengfu Fu,Zhenyu Lin,Yongqiang Dong
The chemical enhancement of semiconductor-based surface-enhanced Raman scattering (SERS) substrates is an exciting hot topic. Herein, a simple hydrothermal method is developed to prepare molybdenum disulfide (MoS2), which can be easily exfoliated into monolayer nanosheets (MoS2NSs) by sonication, even in the absence of any surfactant. The obtained MoS2NSs contain two types of defects, namely, one caused by the incorporation of Mo atoms of high valence states and one caused by the incorporation of S22–. The density of the two types of defects can be easily tuned by controlling the ratio of Na2S and Na2MoO4 in the raw materials. The unique properties and the clear surface make the obtained MoS2NSs ideal models to investigate the effect of defects on the SERS activity of MoS2. It is found that the SERS activity of the obtained MoS2NSs increases dramatically with the defects caused by Mo atoms of high valence states, while it first increases and then decreases with the increase of defects caused by S22–. On the basis, MoS2NSs with high SERS activity and a low detection limit of 5.0 × 10–9 mol/L toward crystal violet (CV) are obtained. Moreover, the mechanism of defects affecting the SERS activity of MoS2NSs is revealed. The defects on one hand provide a large amount of dangling bonds that can combine CV molecules to form MoS2NS–CV complex and on the other hand provide extensive induced local dipoles and enhance the overall SERS spectrum of CV.
研究领域:
材料科学
·
纳米技术
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2013
·Vol. 3
·期 38
·17469-17476
·
IF 2.562
Li-Jun You,Qiao An,Jia Guo,Jack J. Hu,Chang-Chun Wang
Uniform MF/Ag-NPs core–shell composite microspheres were fabricated as isolated SERS (surface-enhanced Raman scattering)-active substrates through coating of Ag nanoparticles (Ag-NPs) onto MF (melamine formaldehyde resin) microspheres. These composite microspheres can be imaged and individually manipulated under an optical microscope. Their SERS spectra can be taken at the focal point to ensure the best analysis result or to recognize the identity of the microsphere for flow cytometry. In this paper, the SERS activity of the composite microspheres was evaluated using 4-ABT, 4-CBT, and 4-DTNB as the Raman reporting molecules; the SERS data of tetramethylthiuram disulfide were also acquired on the isolated MF/Ag-NPs core–shell composite microsphere. Due to the significant electromagnetic coupling effect created by the Ag-NPs on the MF microsphere, the SERS detection limits for 4-ABT, 4-CBT, and 4-DTNB were as low as 10−9 mol L−1, 10−10 mol L−1, and 10−8 mol L−1, respectively. For the insecticide tetramethylthiuram disulfide, the detection limit was 10−9 mol L−1 using the isolated MF/Ag-NPs microsphere as the SERS substrate. The SERS signal intensity linearly depended upon the concentration of tetramethylthiuram disulfide, indicating that the MF/Ag-NPs core–shell composite microsphere can be used for quantitative analysis of this insecticide.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 37
·21845-21851
·
IF 3.119
Shulin Chen,Chen Ding,Yong Lin,Xinzhou Wu,Wei Yuan,Xiuqing Meng,Wenming Su,Ke-Qin Zhang
Here we demonstrate a novel SERS-active substrate assembled by silver nanowire (Ag NW)-embedded porous polystyrene (PS) fibers. Ag NWs are synthesized through a glycerol-mediated solvothermal method firstly, then electrospun into PS porous fibers. The as-synthesized Ag NWs are embedded in PS fiber and aligned orderly along the axial direction. Porous structure appears in PS fiber due to the phase separation induced by rapid evaporation of solvents. Large amounts of holes not only greatly improve the sample collection efficiency of the SERS-active substrate, but also significantly facilitate the adsorption of target molecules on the surface of Ag NWs, thus increasing the probability of enhancement of target molecules. In addition, compared with polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP), PS has better solvent resistance. The detection limit of 4-aminothiophenol (4-ATP) on our fabricated electrospun fiber mats is 10−7 M, and the electrospun fiber mats showed good reproducibility of SERS signal detection. This study proposes a feasible strategy for the large-scale preparation of flexible SERS-active substrate assembled by Ag NW-embedded porous PS fibers. The produced flexible SERS substrates may have potential application in wearable sensors for the trace detection of chemical and biological molecules.
研究领域:
材料科学
·
纳米技术
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
Science China-Chemistry
·
2016
·Vol. 59
·期 8
·1045-1050
·
IF 2.429
Zhen Shujun,Wu Tong,Huang Xin,Li Yuanfang,Huang Chengzhi
We report a new strategy to prepare gold nanoflowers (AuNFs) using a two-step seed-mediated method. The as-prepared AuNFs were employed as surface-enhance Raman scattering (SERS) substrates, showing strong signal enhancement. We further found that iodide ions (I – ) could selectively induce the morphological transformation of AuNFs to spheres, resulting in a blue-shift of the localized surface plasmon resonance (LSPR) bands, a color change of the AuNFs solution from blue to red, and decreased SERS activity. This behavior allows the AuNFs to be used in the determination of I – .
研究领域:
纳米技术
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 25
·12069-12076
·
IF 3.925
Hongji Li,Hongda Xu,Jinyue Zhang,Yi Li,Haochen Yu,Yibo Zhao,Dandan Wang,Yunhui Li,Jianwei Zhu
A novel surface enhanced Raman scattering (SERS) substrate was synthesized by wrapping Ag nanoparticles on the surface of the MIL-101 (Fe) shell under the assistance of IP6, and combining with molecular imprinted polymers (MIPs) for the selective detection of 2,6-DCP. In this study, as a stabilizer and linking agent, IP6 can form a chemical bond with MIL-101 (Fe) to decrease the distance between two Ag nanoparticles and generate more “hot spots”. On the other hand, the inositol hexaphosphate (IP6) and MIL-101 (Fe) shell acted as a protective shell layer, preventing Ag nanoparticles from being polluted by the external environment and reduced SERS activity. In addition, the SERS-MIPs can selectively detect the target molecule, avoiding the influence of other interfering substances on the detection effect. The prepared sensor (Ag/IP6@MIL-101 (Fe)@MIPs, AIM@MIPs) presented sensitive SERS properties, and the detection of limit can reach 10−9 M. The AIM@MIPs also presented strong selective detection to the target molecules, and can be applied for practical sample detection. This test provides a potential application in the detection of environmental pollutants.
研究领域:
分析化学
·
环境科学
·
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Chonghui Li,Chao Zhang,Shicai Xu,Yanyan Huo,Shouzhen Jiang,Cheng Yang,Zhen Li,Xiaofei Zhao,Suzhen Zhang,Baoyuan Man
Hot spots generated from the ultra-small nanogaps will tremendously contribute to the strong electromagnetic field. Therefore, the establishment and design of nanogaps are extremely significant. Here, a hierarchical structure, AgNPs/bilayer graphene/Au nanonet, was proposed to form the dense three-dimensional (3D) hot spots and demonstrated in experiment and theory. Numerous nanometer gaps in the complex Au nanonet structure (∼8.67 nm) and in AgNPs/Au nanonet isolated by bilayer graphene (0.64 nm) were achieved, which is much beneficial for the obtainment of the hot spots. Based on this surface enhanced Raman scattering (SERS) substrate, an excellent SERS activity (EF ∼ 9.1 × 10 9 ), high sensitivity (10 −13 and 10 −12 M respective for Rhodamine 6G (R6G) and crystal violet (CV)), and SERS signals homogeneity, outstanding reproducibility (maximum intensity deviation from substrate to substrate ∼10.43%) were obtained, which can be attributed to the abundant lateral and vertical hot spots introduced by the hierarchical structure. Moreover, the proposed SERS substrate was used to sensitively detect the harmful malachite green (MG), which exhibits a great prospect as a potential SERS sensor in food safety field and biochemical molecules.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
表面增强拉曼散射（SERS）
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
FOOD CONTROL
·
2023
·
IF 6
Yangjie Chen,Li Zheng,Juan Hao,Lijuan Huang,Qinghui Wang,Youting Zhou,Zhihang Yin,Lingpu Jia,Huiming Li,Wenlong Liao,Kunping Liu
In this study, a magnetic metal-organic frameworks (MOFs) based hybrid substrate was designed and fabricated for SERS detection of enrofloxacin (ENR) in milk. The magnetic MOF (Fe 3 O 4 @UiO-66-NH 2 ) was synthesized by a facile microwave-assisted method, then loaded with popcorn-like Au nanoparticles (NPs) through electrostatic interaction. The as-prepared SERS substrate (Fe 3 O 4 @UiO-66-NH 2 /Au NPs) integrated the abundant hot spots of popcorn-like Au NPs with porous Fe 3 O 4 @UiO-66-NH 2 , which greatly improved its SERS activity and stability. More importantly, benefiting from the fingerprint characteristics of SERS and adsorption performance of Fe 3 O 4 @UiO-66-NH 2 , the SERS substrate exhibited high selectivity and sensitivity in detecting ENR. Under the optimal detection condition, a good linearity (R 2 = 0.996) was obtained with ENR concentration of 1.0 × 10 −9 –1.0 × 10 −6 M in spiked milk, the LOD was as low as 5.26 × 10 −10 M, and the recoveries were in the range of 76.1–86.1 % at three different spiking levels. The whole detection process including sample pretreatment took about 50 min, which indicating that the prepared substrate has great potential in sensitive and real-time detection of ENR in milk.
研究领域:
分析化学
·
材料科学
·
纳米技术
·
食品安全
✓ 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）