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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...

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Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
11:44

Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates

Published on: March 20, 2015

Surface-enhanced Raman spectroscopy.

Paul L Stiles1, Jon A Dieringer, Nilam C Shah

  • 1Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.

Annual Review of Analytical Chemistry (Palo Alto, Calif.)
|July 20, 2010
PubMed
Summary

Controlling nanostructured surfaces enhances surface-enhanced Raman spectroscopy (SERS) for advanced analytical applications. This research details fabrication methods for reproducible SERS substrates, enabling new detection capabilities.

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Area of Science:

  • Plasmonics and Nanotechnology
  • Spectroscopy
  • Materials Science

Background:

  • Surface-enhanced Raman spectroscopy (SERS) relies on localized surface plasmon resonance.
  • Controlling nanostructure size, shape, and material is crucial for SERS performance.
  • Advancements in fabrication have transformed SERS into a powerful analytical tool.

Purpose of the Study:

  • To explain fundamental features of SERS.
  • To describe nanosphere lithography for fabricating SERS substrates.
  • To review the application of SERS for detecting chemical warfare agents and biological molecules.

Main Methods:

  • Utilizing nanosphere lithography for substrate fabrication.
  • Developing metal film over nanosphere surfaces.
  • Investigating the properties of these novel SERS substrates.

Main Results:

  • Highly reproducible and robust SERS substrates were fabricated.
  • Metal film over nanosphere surfaces demonstrated superior performance.
  • Enabled experiments previously impossible with older SERS substrates.

Conclusions:

  • Nanostructure control is key to advancing SERS.
  • Nanosphere lithography provides a reliable method for SERS substrate fabrication.
  • SERS shows significant promise for detecting chemical warfare agents and biological molecules.