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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...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...

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Updated: May 22, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional &#960;-conjugate Systems
09:57

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Published on: February 10, 2020

Robust SERS enhancement factor statistics using rotational correlation spectroscopy.

Ted A Laurence1, Gary B Braun, Norbert O Reich

  • 1Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, United States. laurence2@llnl.gov

Nano Letters
|May 4, 2012
PubMed
Summary
This summary is machine-generated.

This study quantifies surface-enhanced Raman spectroscopy (SERS) enhancement factors in silver nanocapsules. Nanoparticle linking consistently yields high SERS enhancement factors, crucial for sensitive molecular detection.

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Fabrication of polydimethylsiloxane (PDMS)-Based Flexible Surface-Enhanced Raman Scattering (SERS) Substrate for Ultrasensitive Detection
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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
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Last Updated: May 22, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional &#960;-conjugate Systems
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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Published on: February 10, 2020

Fabrication of polydimethylsiloxane (PDMS)-Based Flexible Surface-Enhanced Raman Scattering (SERS) Substrate for Ultrasensitive Detection
03:33

Fabrication of polydimethylsiloxane (PDMS)-Based Flexible Surface-Enhanced Raman Scattering (SERS) Substrate for Ultrasensitive Detection

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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
09:57

Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

Published on: July 25, 2022

Area of Science:

  • Nanotechnology
  • Spectroscopy
  • Materials Science

Background:

  • Surface-enhanced Raman spectroscopy (SERS) offers high sensitivity for molecular detection.
  • Achieving consistent and high SERS enhancement factors remains a challenge.
  • Individual hot spots in nanostructured materials are key to SERS performance.

Purpose of the Study:

  • To characterize the distribution of SERS enhancement factors in individual hot spots.
  • To evaluate the role of nanoparticle linking in SERS performance.
  • To establish a reliable method for SERS hot spot analysis.

Main Methods:

  • Fabrication of silver nanocapsules via controlled nanoparticle linking and encapsulation.
  • Calculation of enhancement factors by comparing single hot spot signals to bulk solution signals.
  • Utilizing correlation spectroscopy and polarization response to identify single hot spots.

Main Results:

  • Enhancement factors ranged from 10^6 to 10^8 across individual nanocapsules.
  • Averaging over nanoparticle junctions yielded higher average enhancement factors (10^8).
  • Consistent high SERS enhancement factors were observed, particularly at junctions.

Conclusions:

  • Nanoparticle linking provides a reliable method for generating high SERS enhancement factors.
  • Silver nanocapsules demonstrate potential for sensitive and consistent SERS applications.
  • Understanding hot spot distribution is critical for optimizing SERS substrates.