Flexible porous aerogels decorated with Ag nanoparticles as an effective SERS substrate for label-free trace explosives detection

2020 ◽  
Vol 12 (33) ◽  
pp. 4123-4129
Author(s):  
Wei Liu ◽  
Zihao Song ◽  
Yifan Zhao ◽  
Yu Liu ◽  
Xuan He ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Porous Silica ◽  
Silica Aerogels ◽  
Explosives Detection ◽  
Sers Substrate ◽  
Label Free ◽  
Ag Nanoparticle ◽  
Label Free Detection ◽  
Trace Explosives

Ag nanoparticle decorated porous silica aerogels as a flexible SERS substrate for sensitive, stable and label-free detection of explosive NTO was reported. And this substrate has a certain application prospect in the field of explosives sensing.

scholarly journals Rapid label-free SERS detection of foodborne pathogenic bacteria based on hafnium ditelluride-Au nanocomposites

2020 ◽  
Vol 13 (05) ◽  
pp. 2041004 ◽  
Author(s):  
Yang Li ◽  
Yanxian Guo ◽  
Binggang Ye ◽  
Zhengfei Zhuang ◽  
Peilin Lan ◽  
...  
Keyword(s):  
Pathogenic Bacteria ◽  
Limit Of Detection ◽  
Principal Component ◽  
High Sensitivity ◽  
Chemical Mechanism ◽  
Sers Substrate ◽  
Label Free ◽  
Label Free Detection ◽  
Surface Enhanced Raman ◽  
Foodborne Pathogenic Bacteria

Two-dimensional (2D) nanomaterials have captured an increasing attention in biophotonics owing to their excellent optical features. Herein, 2D hafnium ditelluride (HfTe[Formula: see text], a new member of transition metal tellurides, is exploited to support gold nanoparticles fabricating HfTe2-Au nanocomposites. The nanohybrids can serve as novel 2D surface-enhanced Raman scattering (SERS) substrate for the label-free detection of analyte with high sensitivity and reproducibility. Chemical mechanism originated from HfTe2 nanosheets and the electromagnetic enhancement induced by the hot spots on the nanohybrids may largely contribute to the superior SERS effect of HfTe2-Au nanocomposites. Finally, HfTe2-Au nanocomposites are utilized for the label-free SERS analysis of foodborne pathogenic bacteria, which realize the rapid and ultrasensitive Raman test of Escherichia coli, Listeria monocytogenes, Staphylococcus aureus and Salmonella with the limit of detection of 10 CFU/mL and the maximum Raman enhancement factor up to [Formula: see text]. Combined with principal component analysis, HfTe2-Au-based SERS analysis also completes the bacterial classification without extra treatment.

Improved Label-Free Identification of Individual Exosome-like Vesicles with Au@Ag Nanoparticles as SERS Substrate

2019 ◽  
Vol 11 (43) ◽  
pp. 39424-39435 ◽  
Author(s):  
Juan C. Fraire ◽  
Stephan Stremersch ◽  
Davinia Bouckaert ◽  
Tinne Monteyne ◽  
Thomas De Beer ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Sers Substrate ◽  
Label Free

scholarly journals Label-free highly sensitive probe detection with novel hierarchical SERS substrates fabricated by nanoindentation and chemical reaction methods

2019 ◽  
Vol 10 ◽  
pp. 2483-2496
Author(s):  
Jingran Zhang ◽  
Tianqi Jia ◽  
Yongda Yan ◽  
Li Wang ◽  
Peng Miao ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Enhancement Factor ◽  
Low Cost ◽  
Hierarchical Structures ◽  
Production Method ◽  
Copper Surface ◽  
Sers Substrate ◽  
Label Free ◽  
Sers Substrates ◽  
Highly Sensitive

Nanostructures have been widely employed in surface-enhanced Raman scattering (SERS) substrates. Recently, in order to obtain a higher enhancement factor at a lower detection limit, hierarchical structures, including nanostructures and nanoparticles, appear to be viable SERS substrate candidates. Here we describe a novel method integrating the nanoindentation process and chemical redox reaction to machine a hierarchical SERS substrate. The micro/nanostructures are first formed on a Cu(110) plane and then Ag nanoparticles are generated on the structured copper surface. The effect of the indentation process parameters and the corrosion time in the AgNO3 solution on the Raman intensities of the SERS substrate with hierarchical structures are experimentally studied. The intensity and distribution of the electric field of single and multiple Ag nanoparticles on the surface of a plane and with multiple micro/nanostructures are studied with COMSOL software. The feasibility of the hierarchical SERS substrate is verified using R6G molecules. Finally, the enhancement factor using malachite green molecules was found to reach 5.089 × 109, which demonstrates that the production method is a simple, reproducible and low-cost method for machining a highly sensitive, hierarchical SERS substrate.

High performance SERS active substrates fabricated by directly growing graphene on Ag nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (110) ◽  
pp. 90457-90465 ◽  
Author(s):  
Shicai Xu ◽  
Jihua Wang ◽  
Yan Zou ◽  
Hanping Liu ◽  
Guiying Wang ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Ag Nanoparticles ◽  
High Performance ◽  
Pyrolytic Graphite ◽  
High Vacuum ◽  
Sers Substrate ◽  
Ag Nanoparticle ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

An efficient surface enhanced Raman scattering (SERS) substrate of graphene-isolated Ag nanoparticle (G/AgNP) has been developed by using excimer laser to ablate the ordered pyrolytic graphite in high vacuum onto Ag nanoparticles.

scholarly journals Ag@ZIF-67 decorated cotton fabric as flexible, stable and sensitive SERS substrate for label-free detection of Phenol-soluble modulin

2021 ◽  
Author(s):  
Jiangtao Xu ◽  
Songmin Shang ◽  
Wei Gao ◽  
Ping Zeng ◽  
Shouxiang Kinor Jiang
Keyword(s):  
Cotton Fabric ◽  
Detection Sensitivity ◽  
Sers Substrate ◽  
Label Free ◽  
Zeolitic Imidazolate Frameworks ◽  
Practical Applications ◽  
Sampling Process ◽  
Label Free Detection ◽  
Clinical Diagnoses ◽  
Surface Enhanced Raman

Abstract Although strategies of compositing noble materials and Zeolitic imidazolate frameworks (ZIFs) have been used to enhance the performance of ZIF-based surface-enhanced Raman scattering (SERS) substrates, the enhancement process still remains unclear and the sampling process with powder-form substrates is challenging for practical applications. In this study, a flexible SERS substrate with silver (Ag) nanoparticle decorated ZIF-67 as the active materials and cotton fabric as the supporting framework is developed with a facile method in two steps. The proposed flexible SERS substrate not only can reduce difficulties during the sampling process, but also expands future applications for sampling towards irregular target substances. Meanwhile, the enhancement mechanism has been investigated by using Methylene Blue (MB) to probe the molecular interactions. The constructed SERS substrate shows the highest enhancement factor of 6.25×106 and an excellent detection sensitivity with a limitation of detection (LoD) of 10− 14 M/L. Because of its excellent performance in SERS tracing, the proposed SERS substrate shows exceptional ability in detecting and identifying phenol-soluble modulins and is considered to be a label-free approach that requires no adding markers/tags or antibodies. The proposed substrate expands the potential applications of SERS technology for rapid detection of bacterial toxins during clinical diagnoses and treatment.

scholarly journals Cicada Wing Inspired Template-Stripped SERS Active 3D Metallic Nanostructures for the Detection of Toxic Substances

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1699
Author(s):  
Srijit Nair ◽  
Juan Gomez-Cruz ◽  
Gabriel Ascanio ◽  
Aristides Docoslis ◽  
Ribal Georges Sabat ◽  
...  
Keyword(s):  
World Health ◽  
Excitation Wavelength ◽  
Sers Substrate ◽  
Toxic Substances ◽  
Label Free ◽  
Large Area ◽  
Uv Curable ◽  
Sensing Applications ◽  
Label Free Detection ◽  
Polarization Independent

This article introduces a bioinspired, cicada wing-like surface-enhanced Raman scattering (SERS) substrate based on template-stripped crossed surface relief grating (TS-CSRG). The substrate is polarization-independent, has tunable nanofeatures and can be fabricated in a cleanroom-free environment via holographic exposure followed by template-stripping using a UV-curable resin. The bioinspired nanostructures in the substrate are strategically designed to minimize the reflection of light for wavelengths shorter than their periodicity, promoting enhanced plasmonic regions for the Raman excitation wavelength at 632.8 nm over a large area. The grating pitch that enables an effective SERS signal is studied using Rhodamine 6G, with enhancement factors of the order of 1 × 104. Water contact angle measurements reveal that the TS-CSRGs are equally hydrophobic to cicada wings, providing them with potential self-cleaning and bactericidal properties. Finite-difference time-domain simulations are used to validate the nanofabrication parameters and to further confirm the polarization-independent electromagnetic field enhancement of the nanostructures. As a real-world application, label-free detection of melamine up to 1 ppm, the maximum concentration of the contaminant in food permitted by the World Health Organization, is demonstrated. The new bioinspired functional TS-CSRG SERS substrate holds great potential as a large-area, label-free SERS-active substrate for medical and biochemical sensing applications.

scholarly journals Silver nanoparticle on zinc oxide array for label-free detection of opioids through surface-enhanced raman spectroscopy

RSC Advances ◽  
2021 ◽  
Vol 11 (19) ◽  
pp. 11329-11337
Author(s):  
Michael Zhang ◽  
Congran Jin ◽  
Yuan Nie ◽  
Yundong Ren ◽  
Nanjing Hao ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Zinc Oxide ◽  
Surface Enhanced Raman Spectroscopy ◽  
Great Accuracy ◽  
Label Free ◽  
Ag Nanoparticle ◽  
Label Free Detection ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
On Chip

A plasmonic Ag nanoparticle decorated ZnO array on-chip sensor was developed for label-free detection of opioids through surface-enhanced Raman spectroscopy. The sensor reliably detects opioids as low as 90 ng mL−1 in human blood serum with great accuracy and sensitivity.

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