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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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IR Spectrum01:19

IR Spectrum

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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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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.
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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Nanostructure-enhanced infrared spectroscopy.

Takuo Tanaka1,2,3, Taka-Aki Yano1,2,3, Ryo Kato1,2,3

  • 1Metamaterials Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako , Saitama, 351-0198, Japan.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
Summary
This summary is machine-generated.

Surface-enhanced infrared absorption (SEIRA) spectroscopy uses nanostructures to boost infrared signal sensitivity. Recent advances in resonant SEIRA, nanoantennas, and metamaterials significantly improve performance and enable nanoimaging.

Keywords:
SEIRAinfrared spectroscopymetamaterialsnano-imagingnanostructuresurface plasmons

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Area of Science:

  • Spectroscopy
  • Nanotechnology
  • Plasmonics

Background:

  • Conventional infrared (IR) spectroscopy offers molecular insights but is limited by low sensitivity and poor signal-to-noise ratios due to low absorption cross-sections.
  • Surface-enhanced infrared absorption (SEIRA) spectroscopy utilizes nanostructures to overcome these limitations by enhancing IR signals via surface plasmon resonance.
  • Recent developments in resonant SEIRA have led to significant improvements in signal enhancement factors.

Purpose of the Study:

  • To provide an overview of recent advancements in resonant SEIRA technologies.
  • To highlight the role of nanoantennas and metamaterials in SEIRA.
  • To discuss SEIRA techniques with nanoimaging capabilities.

Main Methods:

  • Review of recent literature on resonant SEIRA spectroscopy.
  • Focus on nanoantenna- and metamaterial-based SEIRA approaches.
  • Exploration of SEIRA techniques integrated with nanoimaging.

Main Results:

  • Significant improvements in signal enhancement factors achieved with resonant SEIRA.
  • Demonstration of nanoantennas and metamaterials as effective platforms for SEIRA.
  • Emergence of SEIRA techniques with enhanced spatial resolution for nanoimaging.

Conclusions:

  • Resonant SEIRA spectroscopy represents a significant leap in enhancing IR signal sensitivity and quality.
  • Nanoantenna and metamaterial designs are crucial for optimizing SEIRA performance.
  • The integration of SEIRA with nanoimaging opens new avenues for nanoscale chemical analysis.