Ag nanowires based SERS substrates with very high enhancement factor

2021 ◽  
pp. 115080
Author(s):  
Mathew K. Francis ◽  
Binaya Kumar Sahu ◽  
P. Balaji Bhargav ◽  
Balaji C ◽  
Nafis Ahmed ◽  
...  
Keyword(s):  
Enhancement Factor ◽  
Sers Substrates ◽  
Ag Nanowires ◽  
Very High

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.

scholarly journals Square-centimeter-scale 2D-arrays of Au@Ag core–shell nanoparticles towards practical SERS substrates with enhancement factor of 10 7

2014 ◽  
Vol 605-606 ◽  
pp. 115-120 ◽  
Author(s):  
Francesca Pincella ◽  
Yeji Song ◽  
Takao Ochiai ◽  
Katsuhiro Isozaki ◽  
Kenji Sakamoto ◽  
...  
Keyword(s):  
Enhancement Factor ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Sers Substrates ◽  
2D Arrays ◽  
Core Shell Nanoparticles

scholarly journals Optimal Size of Gold Nanoparticles for Surface-Enhanced Raman Spectroscopy under Different Conditions

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Seongmin Hong ◽  
Xiao Li
Keyword(s):  
Gold Nanoparticles ◽  
Raman Spectroscopy ◽  
Enhancement Factor ◽  
Surface Enhanced Raman Spectroscopy ◽  
Total Surface Area ◽  
Optimal Size ◽  
Effective Surface ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Gold nanoparticles have been used as effective surface-enhanced Raman spectroscopy (SERS) substrates for decades. However, the origin of the enhancement and the effect of the size of nanoparticles still need clarification. Here, gold nanoparticles with different sizes from 17 to 80 nm were synthesized and characterized, and their SERS enhancement toward both 4-aminothiophenol and 4-nitrothiophenol was examined. For the same number of nanoparticles, the enhancement factor generated from the gold nanoparticles increases as the size of nanoparticles increases. Interestingly, when the concentration of gold or the total surface area of gold nanoparticles was kept the same, the optimal size of gold nanoparticles was found out to be around 50 nm when the enhancement factor reached a maximum. The same size effect was observed for both 4-aminothiophenol and 4-nitrothiophenol, which suggests that the conclusions drawn in this study might also be applicable to other adsorbates during SERS measurements.

scholarly journals Fabrication of Self-Standing Silver Nanoplate Arrays by Seed-Decorated Electrochemical Route and Their Structure-Induced Properties

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Guangqiang Liu ◽  
Guotao Duan ◽  
Lichao Jia ◽  
Jingjing Wang ◽  
Hongzhi Wang ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Electrochemical Capacitor ◽  
Active Surface ◽  
Sers Substrates ◽  
Highly Active ◽  
Ito Glass ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Very High

We present an electrochemical route to synthesize silver nanoplates on seed-decorated Indium tin oxide (ITO) glass substrate. The nanoplates are several tens of to several hundred nanometers in dimension. The density of nanoplates covered on the substrate can be controlled well by adjusting the amounts of seed. All the nanoplates are standing on the substrate uniformly even at very high density. Silver nanoplate arrays displayed an extraordinary superhydrophobicity after chemical modification and can serve as highly active surface-enhanced Raman scattering (SERS) substrates for microdetection. The arrays can also be used as electrodes for electrochemical capacitor with high power density.

scholarly journals Optimum fabrication parameters for preparing high performance SERS substrates based on Si pyramid structure and silver nanoparticles

RSC Advances ◽  
2021 ◽  
Vol 11 (50) ◽  
pp. 31189-31196
Author(s):  
Nguyen Thuy Ngoc Thuy ◽  
Huynh Nguyen Thanh Luan ◽  
Van Vo Kim Hieu ◽  
Mai Thi Thanh Ngan ◽  
Nguyen Tri Trung ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Food Security ◽  
Enhancement Factor ◽  
High Performance ◽  
Sers Substrate ◽  
Practical Applications ◽  
Sers Substrates ◽  
Pyramid Structure ◽  
Fabrication Parameters

AgNPs@PSi substrate can detect abamectin molecules at concentrations as low as 5.7 × 10−9 M, with an enhancement factor of 1 × 106. Such a remarkable SERS substrate promises great potential for practical applications in food security.

Reassessing SERS enhancement factors: using thermodynamics to drive substrate design

2017 ◽  
Vol 205 ◽  
pp. 547-560 ◽  
Author(s):  
J. A. Guicheteau ◽  
A. Tripathi ◽  
E. D. Emmons ◽  
S. D. Christesen ◽  
Augustus W. Fountain
Keyword(s):  
Enhancement Factor ◽  
Sers Substrate ◽  
Us Army ◽  
Analytical Technique ◽  
Sers Substrates ◽  
Advantages And Disadvantages ◽  
Metal Interaction ◽  
Sers Enhancement ◽  
Aromatic Thiols ◽  
Underlying Mechanisms

Over the past 40 years fundamental and application research into Surface-Enhanced Raman Scattering (SERS) has been explored by academia, industry, and government laboratories. To date however, SERS has achieved little commercial success as an analytical technique. Researchers are tackling a variety of paths to help break through the commercial barrier by addressing the reproducibility in both the SERS substrates and SERS signals as well as continuing to explore the underlying mechanisms. To this end, investigators use a variety of methodologies, typically studying strongly binding analytes such as aromatic thiols and azarenes, and report SERS enhancement factor calculations. However a drawback of the traditional SERS enhancement factor calculation is that it does not yield enough information to understand substrate reproducibility, application potential with another analyte, or the driving factors behind the molecule–metal interaction. Our work at the US Army Edgewood Chemical Biological Center has focused on these questions and we have shown that thermodynamic principles play a key role in the SERS response and are an essential factor in future designs of substrates and applications. This work will discuss the advantages and disadvantages of various experimental techniques used to report SERS enhancement with planar SERS substrates and present our alternative SERS enhancement value. We will report on three types of analysis scenarios that all yield different information concerning the effectiveness of the SERS substrate, practical application of the substrate, and finally the thermodynamic properties of the substrate. We believe that through this work a greater understanding for designing substrates will be achieved, one that is based on both thermodynamic and plasmonic properties as opposed to just plasmonic properties. This new understanding and potential change in substrate design will enable more applications for SERS based methodologies including targeting molecules that are traditionally not easily detected with SERS due to the perceived weak molecule–metal interaction of substrates.

A Methodology for Calculating Wave Crest Enhancement in Extreme Seas

2013 ◽  
Author(s):  
Bruce Martin ◽  
Oriol Rijken
Keyword(s):  
Enhancement Factor ◽  
Wave Train ◽  
Irregular Waves ◽  
Wave Crest ◽  
Local Enhancement ◽  
Sea State ◽  
Incoming Wave ◽  
Numerical Predictions ◽  
Very High ◽  
Crest Height

The deck height of a tension leg platform or semi-submersible depends in large part on the expected crest height. This expected crest height is the result of the sea state, i.e. the incoming wave train, and local enhancement due to the vessels diffraction of the wave train. These local enhancements are usually determined by a combination of numerical computations and model tests. Quite often a crest enhancement factor is defined which takes into consideration these local amplification effects. Extrapolating the enhancement factor from extreme conditions to survival conditions may lead to significantly large crests and result in a very high deck elevation. Many studies, including the CresT JIP address the characteristics of the crests within a given sea state and in the absence of a vessel. This paper addresses the effect of the presence of a vessel on the crest heights, and in particular the high crests which will ultimately determine deck height. The paper is based on experimental measurements of wave elevations underneath and around various tension leg platforms and semi submersibles. The investigated sea states comprise of a series of long crested irregular waves, generated in a model basin, which describe extreme and survival conditions in the Gulf of Mexico. The crest heights underneath the vessel are measured and compared with crests which occur without the presence of the vessel. Numerical predictions of the local amplification are also made, based on 1st order diffraction analysis and the as-measured incident wave train. A narrative is provided on the differences in crest height and observed phenomena.

scholarly journals Investigation of 1D Siliver Nanoparticle Arrays for Use as Molecule Concentration-Specific SERS Substrates

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Jun Gao ◽  
Huan Qian ◽  
Shang Xu ◽  
Min Han
Keyword(s):  
Packing Density ◽  
Enhancement Factor ◽  
Interparticle Spacing ◽  
Quantitative Detection ◽  
Logarithmic Scale ◽  
Sers Substrates ◽  
Tiny Amount ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

One-dimensional arrays of silver nanoparticles with a particle size of 10.5 nm and interparticle spacing of 8.5 nm were fabricated by depositing nanoparticles in gas phase on block copolymer self-assembled templates. The substrate showed a surface-enhanced Raman scattering (SERS) enhancement factor as high as1×107with good reproducibility and stability. The dependence of the average enhancement factor and the SERS intensity on the packing density of the analyte molecules were investigated. For a tiny amount of analytes in the range of1×10-14to3×10-13 mol/mm2, the SERS signal showed a linear dependence on the molecule packing density on a logarithmic scale, with a slope of about 1.25. The substrates are promising for quantitative detection of trace level molecules.

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