Raman signal enhancement by multiple beam excitation and its application for the detection of chemicals

2015 ◽  
Vol 107 (9) ◽  
pp. 091114 ◽  
Author(s):  
Sakshi Gupta ◽  
Azeem Ahmad ◽  
Vijayeta Gambhir ◽  
Martha N. Reddy ◽  
Dalip S. Mehta
Keyword(s):  
Signal Enhancement ◽  
Raman Signal ◽  
Multiple Beam ◽  
Beam Excitation

scholarly journals Optimizing Nanostructure Size to Yield High Raman Signal Enhancement by Electron Energy Loss Spectroscopy

2019 ◽  
Vol 25 (S2) ◽  
pp. 610-611
Author(s):  
Yitian Zeng ◽  
Steven Madsen ◽  
Andrew Yankovich ◽  
Eva Olsson ◽  
Robert Sinclair
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
Electron Energy Loss Spectroscopy ◽  
Signal Enhancement ◽  
Raman Signal ◽  
Electron Energy Loss

scholarly journals Ag Nanostructures with Spikes on Adhesive Tape as a Flexible Sers-Active Substrate for In Situ Trace Detection of Pesticides on Fruit Skin

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1750 ◽  
Author(s):  
Jaya Sitjar ◽  
Jiunn-Der Liao ◽  
Han Lee ◽  
Li Peng Pan ◽  
Bernard Haochih Liu ◽  
...  
Keyword(s):  
Hot Spots ◽  
Flexible Substrate ◽  
Signal Enhancement ◽  
Raman Signal ◽  
Adhesive Tape ◽  
Trace Detection ◽  
Fruit Skin ◽  
Active Substrate ◽  
Sers Active Substrate

Nanostructures with spikes (NSPs) have been a subject of several surface-enhanced Raman scattering (SERS) applications owing to their significant Raman signal enhancement brought about by the combined effects of interspike coupling and the accumulated induction on the tips of spikes. Thus, NSPs offer great potential as a SERS-active substrate for relevant applications that require a high density of enhanced “hot spots”. In this study, Ag NSPs were synthesized in varying degrees of agglomeration and were thereafter deposited onto a transparent adhesive tape as a flexible substrate for SERS applications, specifically, in the detection of trace amounts of pesticides. These flexible substrates were referred to as Ag NSPs/tape and optimized with an enhancement factor (EF) of ca. 1.7 × 107. A strong resulting signal enhancement could be attributed to an optimal degree of agglomeration and, consequently, the distances among/between spikes. Long spikes on the synthesized core of Ag NSPs tend to be loosely spaced, which are suitable in detecting relatively large molecules that could access the spaces among the spikes where “hot spots” are generally formed. Since one side of the transparent tape is adhesive, the paste-and-peel off method was successful in obtaining phosmet and carbaryl residues from apple peels as reflected in the acquired SERS spectra. In situ trace detection of the pesticides at low concentrations down to 10−7 M could be demonstrated. In situ trace detection of mixed pesticides was possible as the characteristic peaks of both pesticides were observed in equimolar mixtures of the analytes at 10−2 to 10−4 M. This study is, thus, premised upon applying for in situ trace detection on e.g., fruit skin.

scholarly journals Role of multipolar plasmon resonances during surface-enhanced Raman spectroscopy on Au micro-patches

RSC Advances ◽  
2016 ◽  
Vol 6 (116) ◽  
pp. 115284-115289 ◽  
Author(s):  
Annette Dowd ◽  
Mathias Geisler ◽  
Shaoli Zhu ◽  
Michelle L. Wood ◽  
Michael B. Cortie
Keyword(s):  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Signal Enhancement ◽  
Raman Signal ◽  
Surface Enhanced ◽  
Plasmon Resonances ◽  
Surface Enhanced Raman

Large more reproducibly fabricated microstructures can also provide significant Raman signal enhancementviausually neglected multipolar plasmon resonances.

Non-invasive Raman signal enhancement in a scattering medium

2021 ◽  
Author(s):  
Bingxin Tian ◽  
Bernhard Rauer ◽  
Antoine Boniface ◽  
Jun Hun ◽  
Sylvain Gigan ◽  
...  
Keyword(s):  
Signal Enhancement ◽  
Raman Signal ◽  
Scattering Medium ◽  
Non Invasive

scholarly journals Raman Signal Enhancement Tunable by Gold-Covered Porous Silicon Films with Different Morphology

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5634 ◽  
Author(s):  
Svetlana N. Agafilushkina ◽  
Olga Žukovskaja ◽  
Sergey A. Dyakov ◽  
Karina Weber ◽  
Vladimir Sivakov ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Raman Scattering ◽  
Pore Size ◽  
Signal Enhancement ◽  
Raman Signal ◽  
Sers Spectrum ◽  
Internal Diameter ◽  
Au Nps ◽  
Surface Enhanced Raman ◽  
Size And Morphology

The ease of fabrication, large surface area, tunable pore size and morphology as well surface modification capabilities of a porous silicon (PSi) layer make it widely used for sensoric applications. The pore size of a PSi layer can be an important parameter when used as a matrix for creating surface-enhanced Raman scattering (SERS) surfaces. Here, we evaluated the SERS activity of PSi with pores ranging in size from meso to macro, the surface of which was coated with gold nanoparticles (Au NPs). We found that different pore diameters in the PSi layers provide different morphology of the gold coating, from an almost monolayer to 50 nm distance between nanoparticles. Methylene blue (MB) and 4-mercaptopyridine (4-MPy) were used to describe the SERS activity of obtained Au/PSi surfaces. The best Raman signal enhancement was shown when the internal diameter of torus-shaped Au NPs is around 35 nm. To understand the role of plasmonic resonances in the observed SERS spectrum, we performed electromagnetic simulations of Raman scattering intensity as a function of the internal diameter. The results of these simulations are consistent with the obtained experimental data.

Au nanorod quartets and Raman signal enhancement: towards the design of plasmonic platforms

Nanoscale ◽  
2014 ◽  
Vol 6 (18) ◽  
pp. 10454 ◽  
Author(s):  
Jatish Kumar ◽  
Reshmi Thomas ◽  
R. S. Swathi ◽  
K. George Thomas
Keyword(s):  
Signal Enhancement ◽  
Raman Signal

Raman Signal Enhancement Dependence on the Gel Strength of Ag/Hydrogels Used as SERS Substrates

2014 ◽  
Vol 118 (19) ◽  
pp. 10384-10392 ◽  
Author(s):  
Sara Fateixa ◽  
Ana L. Daniel-da-Silva ◽  
Helena I. S. Nogueira ◽  
Tito Trindade
Keyword(s):  
Gel Strength ◽  
Signal Enhancement ◽  
Raman Signal ◽  
Sers Substrates
Sign in / Sign up

Export Citation Format

Share Document