npj Clean Water
·
2025
·Vol. 8
·期 1
·1-13
·
IF 11.4
Xia Feiyang,Yang Wei,Zhao Haixiao,Cai Yanpeng,Tan Qian
This study is the first to quantify the migration processes of riverine microplastics under different connectivity contexts based on the spatial variation characteristics of microplastic loads. Microplastics in multidammed, single-dammed, and nondammed rivers are significantly different in three categories: abundance, flux, and inventory. Artificial damming can lead to multicategory reorganization of riverine microplastics, including size, polymer type, shape, and color. Artificial damming has led to the formation of microplastic hotspots in river waters and sediments due to reduced river mobility. Notably, low-velocity regions in non-dammed rivers are high hotspot for microplastic deposition, and their inventories may even be 10.63–12.71 times higher than those of other riverbeds. Additionally, results based on microplastic abundance differ significantly from those based on microplastic loads, which in some cases even showed contradictory results. Therefore, future studies must incorporate microplastic loads into the assessment to enhance our understanding of the fate of microplastics in river systems.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 5
·2190
·
IF 4.6
Shanjiang Wang,Dan Su,Huanli Zhou,Xiaohan Jiang,Xiaoyang Zhang,Tong Zhang
In this paper, a hybrid wetting surface (HWS) with Au/Ag alloy nanocomposites was proposed for rapid, cost-effective, stable and sensitive SERS application. This surface was fabricated in a large area by facile electrospinning, plasma etching and photomask-assisted sputtering processes. The high-density ‘hot spots’ and rough surface from plasmonic alloy nanocomposites promoted the significant enhancement of the electromagnetic field. Meanwhile, the condensation effects induced by HWS further improved the density of target analytes at the SERS active area. Thus, the SERS signals increased ~4 orders of magnitude compared to the normal SERS substrate. In addition, the reproducibility, uniformity, as well as thermal performance of HWS were also examined by comparative experiments, indicating their high reliability, portability and practicability for on-site tests. The efficient results suggested that this smart surface had great potential to evolve as a platform for advanced sensor-based applications.Keywords:hybrid wetting surface;SERS;hot spots;condensation effects;sensor-based applications
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
Chinese Physics B
·
2022
·Vol. 31
·期 3
·037803
·
IF 1.652
Hongwen Cao,Liting Guo,Zhen Sun,Tifeng Jiao,Mingli Wang
Wheat leaves with natural microstructures as substrates were covered by the silver nanoislands by magnetron to prepare a low-cost, environment-friendly and mass production surface-enhanced fluorescence (SEF) substrate (Ag-WL substrate). The best SEF substrate was selected by repeatly certifying the fluorescence intensity of 10−5 M Rhodamine B (RB) and 10−5 M Rhodamine 6G (R6G) aqueous solutions. The abundant semi-spherical protrusions and flake-like structures on the surface of the Ag-WL substrate produce high-density hot spots, which provides a new and simple idea for the preparation of biomimetic materials. The results of 3D finite-different time-domain (FDTD) simulation show that the nanoisland gap of semi-spherical protrusions and flake-like structures has produced rich hotspots. By adjusting the time of magnetron sputtering, the enhancement factor (EF) was as high as 839 times, relative standard deviation (RSD) reached as low as 10.7%, and the substrate was very stable and repeatable, which shows that Ag-WL substrate is trustworthy. Moreover, semi-spherical protrusions provide stronger surface-enhanced Raman scattering (SERS) effects compared to flake-like structure. What is more surprising is that the detection limit of the substrate for toxic substance crystal violet (CV) is as low as 10−10 M.
研究领域:
材料科学
·
生物仿生学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 11
·1-10
·
IF 5.3
Teng Yuanjie,Li Xin,Chen Yingxin,Zhong Yi,Xu Pei,Shan Shengyan,Gunasekaran Sundaram
The uneven distribution of hotspots and the challenges associated with precise analyte localization within these hotspots present significant hurdles in the field of surface-enhanced Raman scattering (SERS). Here, at the water–oil interface, gold nanoparticles (AuNPs) interconnected by cucurbiturils[8] (CB[8]) with sub-nanometer gaps (AuNPs:CB[8]) were organized into plasmonic arrays. This arrangement was engineered to generate highly efficient hotspots. The CB[8] molecules, serving a dual role, not only facilitated the assembly of AuNPs with sub-nanometer (~ 1 nm) gaps to create intense plasmonic hotspots but also acted as molecular traps, enabling the precise localization of molecules within these hotspots. By comparing the enhancement effect of probe molecule on Au nanofilm, AuNPs:CB[8] colloids, and AuNPs:CB[8] nanofilm, it was found that the SERS intensity of the E1 characteristic peak in AuNPs:CB[8] nanofilm is five times higher than that on Au nanofilm, and more than 10 4 times higher than that of AuNPs:CB[8] colloids. The gaps are also accessible to different electronegativite molecules, such as estrone, p -aminoazobenzene, or methylene blue, which are captured at the plasmonic hotspots by the interaction of CB[8]. The method was employed for the practical detection of artificial antioxidant butylated hydroxyanisole (BHA), which has a weak Raman scattering cross-section, by coupling it with a reaction to enhance its SERS effect. The detection limit of BHA in soybean oil sample is 5.89 × 10 −8 mol/L, with the recovery range 85.1–115%. In conclusion, this hot-spot design and molecular capture approach will offer a highly effective method for detecting weak Raman scattering cross-section molecules and holds great promise for practical applications in the future. Graphical abstract
研究领域:
化学
·
纳米科技
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Chuhong Zhu,Xiaoye Hu,Xiujuan Wang
Surface-enhanced Raman scattering (SERS) is a promising analytical technique with molecular “fingerprint” characteristic and high sensitivity. To achieve high sensitivity, analytes should be located in or around the so-called SERS “hot spots” that are normally formed in sub-10 nm gaps between the neighboring plasmonic nanostructures. Ordinary SERS substrates generally show low sensitivity to the molecules that have weak affinity to noble-metal surfaces. Here, we fabricate an effective SERS system that can concentrate and adsorb organic pollutants in water for sensitive SERS detection. Such a SERS platform is composed of a thin film of Ag nanocubes/graphene oxide hybrid covered on a small Cu foil, and the Cu foil is placed on a hydrophobic teflon surface. The Ag nanocubes/graphene oxide hybrid film is synthesized by growth of graphene oxide on a Cu foil using electrophoresis and subsequent assembly of Ag nanocubes on the graphene oxide in ethanol via van der Waals interactions. Organic pollutant molecules can be concentrated on the hybrid film by adding a droplet of aqueous analyte solution on the hybrid film and evaporating. Due to the hydrophobic nature of teflon surface, the droplet will shrink onto the hybrid film and realize the concentration of analyte molecules on a SERS platform. There exists large delocalized π-electron system in the graphene oxide, so the Ag nanocubes/graphene oxide hybrid can effectively adsorb a large number of analyte molecules. As there are plenty of nano-sized gaps between the Ag nanocubes that are densely attached on the graphene oxide sheets, high density SERS hot spots can be formed in the gaps. As a result, the Ag nanocubes/graphene oxide hybrid has shown high SERS activity with an enhancement factor of 3.9 × 10 8 and good signal uniformity (relative standard deviation ∼12%). It is further demonstrated that the hybrid SERS substrates have exhibited high SERS sensitivity to organic pollutants such as 4-chlorobiphenyl and methyl parathion, showing promising applicability in many fields as diverse as chemical analysis, environmental monitoring, and food safety inspection.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Meidong Yu,Zhenping Huang,Zhengqi Liu,Jian Chen,Yi Liu,Li Tang,Guiqiang Liu
Surface-enhanced Raman scattering (SERS) technique has presented great potential in medical diagnosis, environment monitoring and food detection due to its high sensitivity, rapid response and fingerprint effect. Many efforts have been concentrated on all kinds of strategies to produce efficient SERS substrates. Here, we report on a simple and controllable method to produce large-area efficient SERS substrates with abundant discrete Au nanoparticles or clusers. The SERS substrates are easily fabricated via a simple annealing process of plasmonic nanoshells coated on photonic structures. The optimally designed Raman substrates show prominent Raman enhancement effect and extremely low detection limit. In comparison to the bare continuous gold film, the optimal SERS substrates annealed at 300 °C present a Raman enhancement of more than 6 orders of magnitude. The ultrasensitive SERS sensing capability is demonstrated down to 10 −12 M by detecting rhodamine 6G (R6G) molecules. The superior Raman properties of the proposed SERS substrates can be ascribed to the highly-dense electric field hotspots mainly formed by interpartice plasmons and crevice gap plasmons. The simple and controllable fabrication strategy and superior performance make the substrates promising candidates for the development of inexpensive, efficient and mass-produced SERS substrates.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 8
·1-11
·
IF 2.101
Wang Shanshan,Liu Zhonghui,Bartic Carmen,Xu Hong,Ye Jian
Surface-enhanced Raman scattering (SERS) tags show ultrasensitivity and multiplexing abilities due to strong and characteristic Raman signals and therefore can be utilized as optical labeling agents similar to fluorescent dyes and quantum dots for biosensing and bioimaging. However, SERS tags have the difficulty to realize quantitative analysis due to the uniformity and reproducibility issue. In this work, we have reported on a new type of SERS tag called Au rod-in-shell (RIS) gap-enhanced Raman tag (GERT). With the high-resolution transmission electron microscopy (TEM) and optical absorbance measurements, we have demonstrated the subnanometer sized gap junctions inside the RIS GERTs. SERS measurements and FDTD calculations show that the core–shell subnanometer gap geometry in the RIS GERTs not only generates strong SERS hot spots but also isolates SERS hot spots by Au shells to avoid the influence when the particle aggregates form, therefore showing better SERS uniformity and stronger SERS intensity than normal Au nanorods. Those RIS NPs exhibit great potential as the labeling agents for SERS-based bioimaging and biosensing applications.
研究领域:
纳米技术
·
生物医学工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 3
·694-699
·
IF 3.117
Muhammad Usman Amin,Lingling Zhang,Rui Hao,Dongjie Zhang,Hongjun You,Jixiang Fang
We successfully prepared silver dendritic nanostructures with a well-defined and precisely tailored trunk and branches, as well as decorated nanoparticles, by a simple and controllable two-electrode electrochemical deposition system using different AgNO3 concentrations and deposition potentials. The prepared nanostructures are used as SERS substrates for the detection of crystal violet molecules with a minimum detection limit of 10−11 M. Finite-difference time-domain (FDTD) simulation is used to analyze the SERS activity of diverse silver dendritic nanostructures. The SERS and FDTD results revealed that the pine leaf-like structure displays excellent sensitivity and reproducibility compared to all other structures due to a large number of hotspot sites between branch–branch and branch–particle junctions. This article provides a good understanding of electromagnetic field enhancement and shows that various silver dendritic nanostructures could be potential candidates for SERS-based detection.
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
LANGMUIR
·
2017
·
IF 3.833
Yaru Jia,Lei Zhang,Liping Song,Liwei Dai,Xuefei Lu,Youju Huang,Jiawei Zhang,Zhiyong Guo,Tao Chen
Sensitivity and reproducibility are two major concerns to improve the performance and extend the range of practical applications of surface-enhanced Raman scattering (SERS). A theoretical report reveals that hot spots formed by gold nanoparticles with a tip-to-tip configuration would generate the maximum electric field enhancement because of the lightning rod effect. In our present study, we constructed a giant vesicle consisting of anchored tiny gold nanowires to provide a high density of sharp tip-to-tip nanogaps for SERS application. The tiny gold nanowires were directly grown and anchored onto the surfaces of polystyrene (PS) microspheres by a seed-mediated method. Then, the removal of PS microspheres by tetrahydrofuran led to the formation of the giant gold vesicles with hierarchical cage structures, providing the sharp tips and high density of hot spots for improving SERS performance. Compared with the nonwire structure (island and inhibited nanoparticle), giant gold vesicles with tiny wires showed a higher SERS enhancement factor (9.90 × 107) and quantitative SERS analysis in the range of 10–4 to 10–7 M. In addition, the large-scale giant gold vesicle array on the silica substrate resulted in a high reproducibility of SERS signals with the variation of intensities less than 7.6%.
研究领域:
纳米材料学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Tianhua Xie,Zijin Cao,Yuejing Li,Zhiyan Li,Fan-Li Zhang,Yingqiu Gu,Caiqin Han,Guohai Yang,Lulu Qu
Pesticide residues will be a huge threat to food security and ecological environment; therefore, there is an urgent need to achieve rapid and on-site detection of pesticide residues. Herein, a plasmonic substrate with multiple “hot spots” was fabricated by transferring three-dimensional (3D) Au nanoparticles (NPs) onto the polydimethylsiloxane (PDMS) membrane for highly sensitive surface-enhanced Raman scattering (SERS) detection of pesticide residues. In combination with 3D-FDTD simulations, high SERS enhancement (EF = 1.2 × 10 8 ) and high detection sensitivity (LOD = 6.3 × 10 -10 M) were achieved, mainly due to the enhanced electromagnetic fields around the “hot spots”. Additionally, the PDMS-based SERS substrate held good transparency and flexibility, enabling conformal contact with non-planar surfaces and allowing the laser to penetrate the back of the analytes. Combined with a portable Raman spectrometer, the substrates holds great potential for rapid, high-sensitive, and on-site detection of contaminants in food, especially for the analyte on the nonplanar surfaces.
研究领域:
分析化学
·
食品安全
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Junhao Lin,Shichang Sun,Donghua Xu,Chongwei Cui,Rui Ma,Juan Luo,Lin Fang,Haowen Li
The microwave pyrolysis of biomass and the directional design of biochar structure are examined in this study by exploring the internal connection between energy conversion and biochar structure evolution. Through the optimization of process parameters (microwave power and sample volume), the average utilization efficiency of microwave energy increased from 11.96% to 32.84%, and the specific surface area of the biochar increased from 453.89 m 2 /g to 638.82 m 2 /g. According to the simulation results of the COMSOL Multiphysics software, the distribution of the temperature field was closely related to the evolution of the microwave electric field intensity. The local high temperature areas (hotspots) were primarily located in the center of the biochar, and the temperature distribution gradually decreased from the inside to the outside. The hotspots contributed to the promotion of the conversion of amorphous carbon to graphite carbon. Meanwhile, the graphite carbon with a stronger microwave absorption capacity formed a local hotspot and promoted the growth of the pore structure. The rich pore structure of the biochar facilitated the multiple reflection of microwave energy and prolonged the microwave residence time. Graphite carbon can absorb microwave energy and convert it into heat energy to improve the utilization efficiency of microwave energy. This paper combined the experimental and simulation results to reveal the heat transfer mechanism in the microwave pyrolysis process, which provided a new perspective for the directional reduction of microwave pyrolysis energy consumption and the optimization of the microstructure of biochar.
研究领域:
能源与环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 11
·1733
·
IF 5.3
Pei Zeng,Mengjie Zheng,Hao Chen,Guanying Chen,Zhiwen Shu,Lei Chen,Huikang Liang,Yuting Zhou,Qian Zhao,Huigao Duan
Seeking sensitive, large-scale, and low-cost substrates is highly important for practical applications of surface-enhanced Raman scattering (SERS) technology. Noble metallic plasmonic nanostructures with dense hot spots are considered an effective construction to enable sensitive, uniform, and stable SERS performance and thus have attracted wide attention in recent years. In this work, we reported a simple fabrication method to achieve wafer-scale ultradense tilted and staggered plasmonic metallic nanopillars filled with numerous nanogaps (hot spots). By adjusting the etching time of the PMMA (polymethyl methacrylate) layer, the optimal SERS substrate with the densest metallic nanopillars was obtained, which possessed a detection limit down to 10−13M by using crystal violet as the detected molecules and exhibited excellent reproducibility and long-term stability. Furthermore, the proposed fabrication approach was further used to prepare flexible substrates; for example, a SERS flexible substrate was proven to be an ideal platform for analyzing low-concentration pesticide residues on curved fruit surfaces with significantly enhanced sensitivity. This type of SERS substrate possesses potential in real-life applications as low-cost and high-performance sensors.Keywords:SERS;hot spots;large-scale production;sensitivity;flexible substrate
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
危险品化学品经营许可证（带存储）