scholarly journals Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection

2021 ◽  
Vol 22 (22) ◽  
pp. 12191
Author(s):  
Puran Pandey ◽  
Sundar Kunwar ◽  
Ki-Hoon Shin ◽  
Min-Kyu Seo ◽  
Jongwon Yoon ◽  
...  
Keyword(s):  
High Surface ◽  
Atomic Layer ◽  
Surface Enhanced Raman Spectroscopy ◽  
Core Shell ◽  
Sers Substrate ◽  
Practical Applications ◽  
Highly Sensitive ◽  
Relative Standard ◽  
Surface Enhanced Raman ◽  
Sers Detection

In this work, we develop a Ag@Al2O3@Ag plasmonic core–shell–satellite (PCSS) to achieve highly sensitive and reproducible surface-enhanced Raman spectroscopy (SERS) detection of probe molecules. To fabricate PCSS nanostructures, we employ a simple hierarchical dewetting process of Ag films coupled with an atomic layer deposition (ALD) method for the Al2O3 shell. Compared to bare Ag nanoparticles, several advantages of fabricating PCSS nanostructures are discovered, including high surface roughness, high density of nanogaps between Ag core and Ag satellites, and nanogaps between adjacent Ag satellites. Finite-difference time-domain (FDTD) simulations of the PCSS nanostructure confirm an enhancement in the electromagnetic field intensity (hotspots) in the nanogap between the Ag core and the satellite generated by the Al2O3 shell, due to the strong core–satellite plasmonic coupling. The as-prepared PCSS-based SERS substrate demonstrates an enhancement factor (EF) of 1.7 × 107 and relative standard deviation (RSD) of ~7%, endowing our SERS platform with highly sensitive and reproducible detection of R6G molecules. We think that this method provides a simple approach for the fabrication of PCSS by a solid-state technique and a basis for developing a highly SERS-active substrate for practical applications.

scholarly journals Ag Nanoparticle-Decorated Cu2S Nanosheets for Surface Enhanced Raman Spectroscopy Detection and Photocatalytic Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2508
Author(s):  
Osama Nasr ◽  
Jian-Ru Jiang ◽  
Wen-Shuo Chuang ◽  
Sheng-Wei Lee ◽  
Chih-Yen Chen
Keyword(s):  
Reduction Method ◽  
Organic Pollutant ◽  
Surface Enhanced Raman Spectroscopy ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Enhanced Raman Scattering ◽  
New Generation ◽  
Photocatalytic Applications

In this article, we demonstrate a facile, rapid, and practical approach to growing high-quality Cu2S nanosheets decorated with Ag nanoparticles (NPs) through the galvanic reduction method. The Ag/Cu2S nanosheets were efficiently applied to the surface-enhanced Raman scattering (SERS) and photocatalytic degradation applications. The photodegradation of RhB dye with the Ag/Cu2S nanosheets composites occurred at a rate of 2.9 times faster than that observed with the undecorated Cu2S nanosheets. Furthermore, the Ag/Cu2S nanosheets displayed highly sensitive SERS detection of organic pollutant (R6G) as low as 10−9 M. The reproducibility experiments indicated that the Ag/Cu2S nanosheets composites could be used for dual functionality in a new generation of outstandingly sensitive SERS probes for detection and stable photocatalysts.

scholarly journals Application of Aluminum Hydroxide for Improvement of Label-Free SERS Detection of Some Cephalosporin Antibiotics in Urine

Biosensors ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 91 ◽  
Author(s):  
Natalia E. Markina ◽  
Alexey V. Markin
Keyword(s):  
Aluminum Hydroxide ◽  
Surface Enhanced Raman Spectroscopy ◽  
Negative Influence ◽  
Quantitative Detection ◽  
Therapeutic Drug ◽  
Excitation Wavelength ◽  
Sers Substrate ◽  
Label Free ◽  
Surface Enhanced Raman ◽  
Sers Detection

This report is dedicated to development of surface-enhanced Raman spectroscopy (SERS) based analysis protocol for detection of antibiotics in urine. The key step of the protocol is the pretreatment of urine before the detection to minimize background signal. The pretreatment includes extraction of intrinsic urine components using aluminum hydroxide gel (AHG) and further pH adjusting of the purified sample. The protocol was tested by detection of a single antibiotic in artificially spiked samples of real urine. Five antibiotics of cephalosporin class (cefazolin, cefoperazone, cefotaxime, ceftriaxone, and cefuroxime) were used for testing. SERS measurements were performed using a portable Raman spectrometer with 638 nm excitation wavelength and silver nanoparticles as SERS substrate. The calibration curves of four antibiotics (cefuroxime is the exception) cover the concentrations required for detection in patient’s urine during therapy (25/100‒500 μg/mL). Random error of the analysis (RSD < 20%) and limits of quantification (20‒90 μg/mL) for these antibiotics demonstrate the applicability of the protocol for reliable quantitative detection during therapeutic drug monitoring. The detection of cefuroxime using the protocol is not sensitive enough, allowing only for qualitative detection. Additionally, time stability and batch-to-batch reproducibility of AHG were studied and negative influence of the pretreatment protocol and its limitations were estimated and discussed.

scholarly journals Ag@Au Core–Shell Porous Nanocages with Outstanding SERS Activity for Highly Sensitive SERS Immunoassay

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1554 ◽  
Author(s):  
Yaqi Huang ◽  
Dajie Lin ◽  
Mengting Li ◽  
Dewu Yin ◽  
Shun Wang ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Raman Spectroscopy ◽  
Hot Spots ◽  
Signal Amplification ◽  
Surface Enhanced Raman Spectroscopy ◽  
Core Shell ◽  
Chloroauric Acid ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

A highly sensitive immunoassay of biomarkers has been achieved using 4-mercaptobenzoic acid-labeled Ag@Au core–shell porous nanocage tags and α-fetoprotein immuno-sensing chips. The Ag@Au porous nanocages were uniquely synthesized by using an Ag core as a self-sacrificial template and reducing agent, where the slow reaction process led to the formation of a porous Au layer. The size of the remaining Ag core and surface roughness of the Au shell were controlled by adjusting the chloroauric acid concentration. The porous cage exhibited excellent surface-enhanced Raman spectroscopy (SERS) activity, presumably due to a synergetic interaction between newly generated hot spots in the rough Au shell and the retained SERS activity of the Ag core. Using α-fetoprotein as a model analyte for immunoassay, the SERS signal had a wide linear range of 0.20 ng mL−1 to 500.0 ng mL−1 with a detection limit of 0.12 ng mL−1. Without the need of further signal amplification, the as-prepared Ag@Au bimetallic nanocages can be directly used for highly sensitive SERS assays of other biomarkers in biomedical research, diagnostics, etc.

β-Cyclodextrin coated SiO2@Au@Ag core–shell nanoparticles for SERS detection of PCBs

2015 ◽  
Vol 17 (33) ◽  
pp. 21149-21157 ◽  
Author(s):  
Yilin Lu ◽  
Guohua Yao ◽  
Kexi Sun ◽  
Qing Huang
Keyword(s):  
Ag Nanoparticles ◽  
Core Shell ◽  
Sers Substrate ◽  
Shell Nanoparticles ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
New Type ◽  
Enhanced Raman Scattering ◽  
Core Shell Nanoparticles

A new type of surface-enhanced Raman scattering (SERS) substrate consisting of β-cyclodextrin (β-CD) coated SiO2@Au@Ag nanoparticles (SiO2@Au@Ag@CD NPs) has been achieved.

scholarly journals Flexible and Reusable Ag Coated TiO2 Nanotube Arrays for Highly Sensitive SERS Detection of Formaldehyde

Molecules ◽  
2020 ◽  
Vol 25 (5) ◽  
pp. 1199 ◽  
Author(s):  
Tong Zhu ◽  
Hang Wang ◽  
Libin Zang ◽  
Sila Jin ◽  
Shuang Guo ◽  
...  
Keyword(s):  
Limit Of Detection ◽  
Surface Enhanced Raman Spectroscopy ◽  
Catalytic Performance ◽  
Tio2 Nanotube ◽  
Detection Sensitivity ◽  
Sers Substrate ◽  
Environmental Media ◽  
Sensing Platform ◽  
Surface Enhanced Raman ◽  
Sers Detection

Quantitative analysis of formaldehyde (HCHO, FA), especially at low levels, in various environmental media is of great importance for assessing related environmental and human health risks. A highly efficient and convenient FA detection method based on surface-enhanced Raman spectroscopy (SERS) technology has been developed. This SERS-based method employs a reusable and soft silver-coated TiO2 nanotube array (TNA) material, such as an SERS substrate, which can be used as both a sensing platform and a degradation platform. The Ag-coated TNA exhibits superior detection sensitivity with high reproducibility and stability compared with other SERS substrates. The detection of FA is achieved using the well-known redox reaction of FA with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (AHMT) at room temperature. The limit of detection (LOD) for FA is 1.21 × 10−7 M. In addition, the stable catalytic performance of the array allows the degradation and cleaning of the AHMT-FA products adsorbed on the array surface under ultraviolet irradiation, making this material recyclable. This SERS platform displays a real-time monitoring platform that combines the detection and degradation of FA.

scholarly journals Detection of a Sudan dye at low concentrations by surface-enhanced Raman spectroscopy using silver nanoparticles

2019 ◽  
Vol 29 (4) ◽  
pp. 521
Author(s):  
Tran Cao Dao ◽  
Truc Quynh Ngan Luong ◽  
Tuan Anh Cao ◽  
Ngoc Minh Kieu
Keyword(s):  
Raman Spectroscopy ◽  
Silver Nanoparticles ◽  
Good Method ◽  
Surface Enhanced Raman Spectroscopy ◽  
Sers Substrate ◽  
Sudan Dyes ◽  
Sudan I ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection

Sudan dyes are red colorants banned from use for food due to their toxic properties. However, because of the cheapness, they are sometimes adulterated into food illegally. Currently surface-enhanced Raman spectroscopy (SERS) is emerging as a good method to detect residues (including trace amounts) of Sudan dyes in food. In this report we present the SERS detection of Sudan I (a type of Sudan dyes) to concentrations as low as 1 ppb, using a very simple SERS substrate, which is made from silver nanoparticles chemically deposited on silicon surface.

Simultaneous extraction and surface enhanced Raman spectroscopy detection for rapid and reliable identification of nicotine release of snus products

2021 ◽  
Author(s):  
Yongfeng Tian ◽  
Xianghu Tang ◽  
Ya-Ning Fu ◽  
Shanzhai Shang ◽  
Gaofeng Dong ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Structural Information ◽  
Surface Enhanced Raman Spectroscopy ◽  
Simultaneous Extraction ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Target Molecules ◽  
Unique Chemical

Surface enhanced Raman spectroscopy (SERS) is a highly sensitive analytical detection technique that provides unique chemical and structural information on target molecules. Here, simultaneous extraction and SERS detection of nicotine...

scholarly journals Silver Flowerlike Structures for Surface-Enhanced Raman Spectroscopy

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3184
Author(s):  
Gitchka G. Tsutsumanova ◽  
Neno D. Todorov ◽  
Stoyan C. Russev ◽  
Miroslav V. Abrashev ◽  
Victor G. Ivanov ◽  
...  
Keyword(s):  
High Surface ◽  
Volume Ratio ◽  
Cost Effective ◽  
Surface Enhanced Raman Spectroscopy ◽  
Aluminum Surface ◽  
Sers Substrate ◽  
Raman Enhancement ◽  
Developed Surface ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Micro- and nanoflowers are a class of materials composed of particles with high surface-to-volume ratio. They have been extensively studied in the last decade due to simple preparation protocols and promising applications in biosensing, as drug delivery agents, for water purification, and so on. Flowerlike objects, due to their highly irregular surface, may act also as plasmonic materials, providing resonant coupling between optical waves and surface plasmon excitations. This fact allows us to infer the possibility to use micro- and nanoflowers as effective surface-enhanced Raman scattering (SERS) substrate materials. Here, we report on the design and Raman enhancement properties of silver flowerlike structures, deposited on aluminum surface. A simple and cost-effective fabrication method is described, which leads to SERS substrates of high developed surface area. The morphology of the silver flowers on a nanoscale is characterized by self-organized quasiperiodic stacks of nanosheets, which act as plasmonic cavity resonators. The substrates were tested against rhodamine-6G (R6G) water solutions of concentration varying between 10−3 M and 10−7 M. Optimal SERS enhancement factors of up to 105 were established at R6G concentrations in the 10−6–10−7 M range.

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