Surface-enhanced Raman spectroscopy or surface-enhanced Raman scattering (SERS) is a surface-sensitive technique that enhances Raman scattering by moleculesadsorbed on rough metal surfaces or by nanostructures such as plasmonic-magnetic silica nanotubes. The enhancement factor can be as much as 1010 to 1011, which means the technique may detect single molecules.
History
SERS from pyridine adsorbed on electrochemically roughened silver was first observed by Martin Fleischmann, Patrick J. Hendra and A. James McQuillan at the Department of Chemistry at the University of Southampton, Southampton, UK in 1973. This initial publication has been cited over 4000 times. The 40th Anniversary of the first observation of the SERS effect has been marked by the Royal Society of Chemistry by the award of a National Chemical Landmark plaque to the University of Southampton. In 1977, two groups independently noted that the concentration of scattering species could not account for the enhanced signal and each proposed a mechanism for the observed enhancement. Their theories are still accepted as explaining the SERS effect. Jeanmaire and Van Duyne
proposed an electromagnetic effect, while Albrecht and Creighton
proposed a charge-transfer effect. Rufus Ritchie, of Oak Ridge National Laboratory's Health Sciences Research Division, predicted the existence of the surface plasmon.
When photons are scattered from an atom or molecule, most photons are elastically scattered (Rayleigh scattering), such that the scattered photons have the same energy (frequency and wavelength) as the incident photons. A small fraction of the scattered photons (approximately 1 in 10 million) are scattered by an excitation, with the scattered photons having a frequency different from, and usually lower than, that of the incident photons. In a gas, Raman scattering can occur with a change in energy of a molecule due to a transition to another (usually higher) energy level. Chemists are primarily concerned with the transitional Raman effect.
History
The inelastic scattering of light was predicted by Adolf Smekal in 1923 (and in German-language literature it may be referred to as the Smekal-Raman effect). In 1922, Indian physicist C. V. Raman published his work on the "Molecular Diffraction of Light," the first of a series of investigations with his collaborators that ultimately led to his discovery (on 28 February 1928) of the radiation effect that bears his name. The Raman effect was first reported by C. V. Raman and K. S. Krishnan, and independently by Grigory Landsberg and Leonid Mandelstam, on 21 February 1928 (that is why in the former Soviet Union the priority of Raman was always disputed; thus in Russian scientific literature this effect is usually referred to as "combination scattering" or "combinatory scattering"). Raman received the Nobel Prize in 1930 for his work on the scattering of light.
With Raman spectroscopy, you scatter light to see the photon’s energy shift ... A 2022 Journal of the American Chemical Society review found surface-enhanced Raman scattering (SERS) increased sensitivity when examining low-concentration molecules.
But a drop of blood is all that is needed for Quan's surface enhanced Raman scattering microfluidic biosensor to spot the early signs of lung cancer, allowing clinicians to intervene quickly.
Surface-enhanced Raman scattering (SERS) is a rapid and non-destructive detection method widely used in various fields including trace pollutant monitoring, food safety, chemical catalysis, and molecular fingerprint identification.
“It uses Surface Enhanced Raman Spectroscopy to detect analytes even at low concentrations, and is based on semiconductor process technology and works on the principle of Surface Enhanced Raman Scattering (SERS),” the Institute said ... ....
*Surface-enhanced Raman Spectroscopy (SERS) is a technique that enhances Raman scattering of molecules embedded on a given surface by several orders of magnitude through the amplification of the electron cloud density around these molecules.
Because of the abundant hot spots in their structure, branch-shaped gold nanomaterials are getting recognized as suitable enhancers for surface-enhanced Raman scattering (SERS), a technique typically used to detect toxic dye pollutants.
Surface-enhanced Raman scattering (SERS) is a powerful fingerprint analysis and detection technique that plays an important role in the fields of food safety, environmental protection, bio-imaging and hazardous substance identification.
They adjusted the gold aerogels from about 10 to 200 nm and developed a constituent of extremely high purity and crystallinity to reveal potential applications in photocatalysis and surface-enhanced Raman scattering.
Scientists suggest special nano-pocket for surface-enhanced Raman spectroscopy scattering detection (2023, July 28) retrieved 28 July 2023 from https.//phys.org/news/2023-07-scientists-special-nano-pocket-surface-enhanced-raman.html.
Raman spectroscopy segment is sub-segmented into sampling technique and type. Sampling technique segment is further bifurcated into surface-enhanced Raman scattering, tip-enhanced Raman scattering and other Raman spectroscopy techniques.
Tin layers can be used as UV-SERS-active surfaces in surface-enhanced Raman scattering (SERS) spectroscopy, which can be applied to determine the molecular fingerprint of biological samples using SERS-active metal nanostructures.
One promising alternative is a chemical analysis tool called surface-enhanced Raman scattering, or SERS... using a common wet chemical approach to enable the surface-enhanced Raman scattering process.
