CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Qianqian Shang,Xin Tan,Mingcan Chen,Songyue Han,Tao Yu
High-efficient SERS substrates containing dense hot spots were fabricated by assembling 3D Ag nanoflowers (AgNFs)@Au-FTO substrate by using citrate ions as the shape-guiding agent. The vertical growth of 3D AgNFs could be attributed to the synergistic effects of the concentration gradient layer of Ag + and the density gradient of the charge carrier. Combined with the simulation result of FDTD method, the enhanced SERS sensitivity and repeatability of AgNFs@Au-FTO could be attributed to the enlarged specific surface area, and the improved density of hot spots contributed by the overlap between the vertically stacked AgNSs with a high population of sharp edges.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Xiaomu Shan,Jie Pan,Xuejian Du,Jian Shi,Zhuofan Wei,Yuanze Xu,Shouzhen Jiang
The excellent performance of surface-enhanced Raman spectroscopy (SERS) is closely related to the intensity, density and uniformity of hotspots. In this study, we introduce a PET/Au NPs@COF Raman substrate featuring three-dimensional hotspots. The spacing between each layer of gold nanoparticles (NPs) is precisely controlled by adjusting the thickness of the COF via the interfacial synthesis technique, causing the strong coupling between gold particles across the layers. The porosity of the COF enables the substrate to adsorb numerous analyte molecules into the large-area uniform hotspots. Through simulations and adsorption detection on the substrate, Raman testing further demonstrated that the substrate with double-layer Au NPs@COF exhibited the most favorable SERS performance. Additionally, the substrate allows for selective detection based on the particle size of the target molecule. The flexibility of the substrate enables it to conform to irregular surfaces, effectively capturing analytes from a variety of real samples.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Wei Zhang,Tianxing Zheng,Bin Ai,Panpan Gu,Yuduo Guan,Yu Wang,Zhiyuan Zhao,Gang Zhang
Au-polymer-Au nanogap ( Au-P-Au)-coupled gold nanoparticle (Au NP) platforms are fabricated via a combination of nanoskiving and polymer-assisted assembly. The structure consists of multiple types of nanogaps, specified as nanogaps within Au-P-Au, narrow nanogaps between assembled Au NPs, and nanogaps between Au NPs and the edge of the nanogap. The electric field is strongly enhanced in the nanogaps due to the confinement of incident light, generating multiple “hot spots”. The Au-P-Au-coupled Au NP platform promotes a significant surface-enhanced Raman scattering (SERS) performance, achieving a maximum enhancement factor of 1.36 × 10 8 and a sensitive detection of glucose. The united nanofabrication technology for Au-P-Au-coupled Au NP platforms with a considerable SERS enhancement would facilitate the applications of nonlinear optics, nano-photonics, and surface-enhanced spectroscopy.
研究领域:
纳米光学
·
材料科学
·
光谱学
✓ 已验证
DOI
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2019
·Vol. 50
·期 10
·1445-1451
·
IF 2.809
Aili Liu,Huile Jin,Jun Li,Liyun Chen,Haoyuan Zheng,Xinnan Mao,Dajie Lin,Jichang Wang,Shun Wang,Weizhong Jiang
A microwave- and ultrasound-assisted reduction and assembly of lead dimethyldithiocarbamate (Pb (DMDC) 2 ) led to the formation of rod-like Pb (DMDC) 2 embedded with PbS quantum dots (QDs). Transmission electron microscopy measurements show the presence of numerous isolated PbS QDs on the Pb (DMDC) 2 microrod surface, which may potentially act as hot spots for enhanced Raman spectroscopy. A case study using mercaptopyridine as the analyte demonstrates that the rod-like hybrids have outstanding performance as a surface-enhanced Raman scattering (SERS) substrate, comparable with that of Au nanorods. The excellent SERS performance of the as-fabricated PbS QDs/Pb (DMDC) 2 hybrids may be attributed to the unique dispersion of PbS QDs as well as the intimate contacts between PbS QDs and Pb (DMDC) 2 . This study therefore presents a new approach for the development of low-cost and highly efficient semiconductor-based SERS substrates.
研究领域:
材料科学
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Fangyuan Diao,Xinxin Xiao,Bing Luo,Hui Sun,Fei Ding,Lijie Ci,Pengchao Si
It is important to design and fabricate nanoporous metals (NPMs) with optimized microstructures for specific applications. In this contribution, nanoporous coppers (NPCs) with controllable thicknesses and pore sizes were fabricated via the combination of a co-sputtering of Cu/Ti with a subsequent dealloying process. The effect of dealloying time on porous morphology and the corresponding surface enhanced Raman scattering (SERS) behaviors were systematically investigated. Transmission electron microscopy (TEM) identified the presences of the gaps formed between ligaments and also the nanobumps on the nanoparticle-aggregated ligament surface, which were likely to contribute as the “hot spots” for electromagnetic enhancement. The optimal NPC film exhibited excellent SERS performance towards Rhodamine 6G (R6G) with a low limiting detection (10 −9 M), along with good uniformity and reproducibility. The calculated enhancement factor of ca. 4.71 × 10 7 was over Au substrates and comparable to Ag systems, promising the proposed NPC as a cheap candidate for high-performance SERS substrate.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xuejiao Wang,Xupeng Zhu,Yiqin Chen,Mengjie Zheng,Quan Xiang,Zhixiang Tang,Guanhua Zhang,Huigao Duan
Highly sensitive and low-cost surface-enhanced Raman scattering (SERS) substrates are essential for practical applications of SERS. In this work, we report an extremely simple but effective approach to achieve sensitive SERS detection of molecules (down to 10–10 M) by using a particle/molecule/film sandwich configuration. Compared to conventional SERS substrates which are preprepared to absorb analyte molecules for detection, the proposed sandwich configuration is achieved by postassembling a flexible transparent gel tape embedded with plasmonic nanoparticles onto an Au film decorated with to-be-detected analyte molecules. In such a configuration, the individual plasmonic gel tape and Au film have low or no SERS activity but the final assembled sandwich structure shows strong SERS signal due to the formation of numerous hot spots at the particle–film interface, where the analyte molecules themselves serve as both spacer and signal probes. Because of its simple configuration, we demonstrate that the proposed SERS substrate can be obtained over a large area with extremely low cost. Particularly, because of the on-demand nature and the flexibility, such a postassembly strategy provides an ideal solution to detect the pesticide residue on fruit surfaces with significantly enhanced sensitivity.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Junjie Zhou,Wenhua Gao,Hanbing Jiang,Zhouyang Xiang,Jinpeng Li,Daxian Cao,Jinsong Zeng,Bin Wang,Jun Xu
Surface-enhanced Raman spectroscopy (SERS) has gained attention as a sensitive technique for the detection of pesticide residues. However, constructing homogeneous, stable, and large-volume “hot spots” is a challenge. In this study, D-T-CNFs@Ag SERS substrates were fabricated by decorating a flexible dialdehyde TEMPO-oxidized cellulose nanofibril (D-T-CNF) film with silver nanoparticles (AgNPs). Carboxylate groups and aldehyde groups on cellulose nanofibrils were used as the growth sites for AgNPs and the main reducing agents for forming three-dimensional “hot spots”, respectively. D-T-CNFs provided protection and immobilization for the AgNPs, allowing SERS substrates to withstand intense ultrasonic treatment, and had a shelf life of over 60 days. In addition, thiram and thiabendazole could be detected at a concentration as low as 10–9 M. The D-T-CNFs@Ag SERS substrate could be used to test thiram on the surface of apples, with a limit of detection (LOD) of 0.047 ng/cm2, realizing the integration of collection and detection.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yun-le Li,Jian Zhu,Guo-jun Weng,Jian-jun Li,Ting-yang Xing,Jun-wu Zhao
The yolk-shell structure is a good choice for surface-enhanced Raman scattering (SERS) substrate because the monomer has a dimer property which can create nanogaps with a strong electromagnetic field distribution. However, the existing yolk-shell structures are mostly synthesized on the basis of nanospheres , and there are few reports on the regulation of their optical properties . Compared with other structures, nanostar has emerged as one of the best morphologies for producing SERS because it has more “hot spots” on the branches. This article has synthesized a star-shaped bimetallic yolk-shell structure-AuAg@AuAg yolk-shell nanostar, which has the dual characteristics of the branches and the core-shell structure. It is shaped like a hand with a glove that extends over the hand and only partially covers the fingers, so we also call it “Magic mitt”. And we have adjusted its optical properties by changing the number of branches of the yolk, the thickness of the hollow middle layer and the thickness of the outer shell in this structure. AuAg@AuAg yolk-shell nanostar has shown excellent performance for the improved SERS of rhodamine 6G because of greater coupling between yolk and shell, larger specific surface area, more sufficient particle aggregation, and the blocking effect of the outer shell. The best SERS enhancement factor (EF) of the AuAg@AuAg yolk-shell nanostars for R6G is 1.223 × 10 6 .
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
OPTICS EXPRESS
·
2023
·Vol. 31
·期 8
·12249-12260
·
IF 3.8
Tianxing Wang,Li Ye,Panpan Xiao,Pengcheng Zhu,Xuchun Gui,Lin Zhuang
Surface-enhanced Raman scattering (SERS) signals are fundamental for spectroscopy applications. However, existing substrates cannot perform a dynamically enhanced modulation of SERS signals. Herein, we developed a magnetically photonic chain-loading system (MPCLS) substrate by loading magnetically photonic nanochains of Fe3O4@SiO2 magnetic nanoparticles (MNPs) with Au nanoparticles (NPs). We achieved a dynamically enhanced modulation by applying an external stepwise magnetic field to the randomly dispersed magnetic photonic nanochains that gradually align in the analyte solution. The closely aligned nanochains create a higher number of hot spots by new neighboring Au NPs. Each chain represents a single SERS enhancement unit with both a surface plasmon resonance (SPR) effect and photonic property. The magnetic responsivity of MPCLS enables a rapid signal enhancement and tuning of the SERS enhancement factor.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2018
·
IF 0
Xingying Zhang,Yalun Mo,Ben Liu,Chenglong Hu,Shaoyun Chen,Hong Shi,Jian Chen
The Ag-nanosheets (i.e., AgNST)-grafted carbon-fenced conductive Ag nanowires with 3D scale-like nanostructure was successfully fabricated through a direct chemical reduction method, where the carbon shell was first carbonized onto the suface of Ag nanowires to form an Ag nanowires@carbon (i.e., AgNWs@C) framework, and then the citrate acid which absorbed on the prefabricated AgNWs@C@Ag seeds framework directed Ag ions to be Ag nanosheets to self-assemble into 3D scale-like nanostructures (i.e., AgNWs@C@AgNST). The fabricated nanostructure displayed the sensitive and reproducible surface-enhanced Raman scattering (SERS) responses. The SERS detection for the probing molecule (rhodamine 6G, R6G) with concentration as low as 10–12 mol/L was obtained in a reproducible way, and the average enhancement factor was about 2.33 × 105, which was calculated from the band of 610 cm–1 in the SERS spectrum. It was caused by Ag nanosheets with high density providing abundant “hot spots” to enhance the SERS detection. Besides, the potential SERS detection of glucose molecules in the micromolar range was also reported.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 36
·12599-12606
·
IF 7.059
Qingyan Han,Zhu Lu,Wei Gao,Meng Wu,Yongkai Wang,Zhongyu Wang,Jianxia Qi,Jun Dong
Noble metal nanoparticles (NPs) with unique plasmonic properties are currently the focus for high-performance surface-enhanced Raman scattering (SERS) substrates. However, how to effectively combine metal NPs with two-dimensional materials to further improve SERS detection sensitivity is still a great challenge. Herein, we successfully synthesize AuAg alloy NPs (ANPs) that integrate the desired plasmonic performance of Ag and the good stability of Au. The plasmonic properties of the AuAg ANPs can be easily tuned by changing the molar ratio of Au and Ag. In addition, we also develop a three-dimensional AuAg ANPs/graphene (G)/AuAg ANPs sandwiched hybrid nanostructure (SHNS) substrate by a reproducible interfacial self-assembly technique. The structure consists of two layers of AuAg ANPs film arrays using monolayer graphene as a nanospacer. The SHNS substrate with sub-nanometer gaps exhibits much higher SERS sensitivity and uniformity for the detection of Rh6G molecules, which is mainly due to the high-density “hot spots” in the nanogaps including between AuAg ANPs and AuAg ANPs in the same layer as well as in the monolayer graphene sub-nanospacer, the synergistic effect between Au and Ag species, and the additional chemical enhancement from graphene. The current studied strategy can be exploited for investigating SERS enhancement mechanisms and developing applications of SHNS substrates with graphene in biological sensing, biodetection, and catalysis.
研究领域:
材料科学
·
光学
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Yalei Wang,Zhongshun Wang,Chunning Chen,Jiaqi Liu,Jiaxin Lu,Nan Lu
Rapid extraction and analysis of target molecules from irregular surfaces are in high demand in the field of on-site analysis. Herein, a flexible platform used for surface-enhanced Raman scattering (SERS) based on an ordered polymer pyramid structure with half-imbedded silver nanoparticles (AgNPs) was prepared to address this issue. The fabrication includes the following steps: (1) creating inverted pyramid arrays in silicon substrate, (2) preparing a layer of AgNPs on the surface of the inverted pyramids, and (3) obtaining a substrate with an ordered polymer pyramids array with half-imbedded AgNPs by the molding method. This flexible substrate is capable of rapid extraction via a simple and convenient “paste and peel off” method. In addition, the substrate exhibits great repeatability and good sensitivity thanks to the uniformity and larger surface area of the ordered pyramids. The density of “hot spots” (local electromagnetic field with high intensity) is increased on the structured surface. Semi-imbedding silver particles in the polymer pyramids makes “hot spots” robust on the substrate. In addition, the preprepared silicon template with the inverted pyramids can be reused, which greatly reduces the production cost. With this substrate, we successfully analyzed thiram molecules on the epidermis of apples, cucumbers, and oranges, and the detection limits are 2.4, 3, and 3 ng/cm2, respectively. These results demonstrate the great potential of the substrate for in situ analysis, which can provide reference for the design of ideal SERS substrates.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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