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Related Concept Videos

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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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 Spectrum01:19

IR Spectrum

1.1K
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.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
1.1K
IR Spectrometers01:25

IR Spectrometers

1.2K
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...
1.2K
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

416
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...
416
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

937
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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In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
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Research Progress in Surface-Enhanced Infrared Absorption Spectroscopy: From Performance Optimization, Sensing

Dongxiao Li1,2, Cheng Xu1,2, Junsheng Xie1,2

  • 1Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore.

Nanomaterials (Basel, Switzerland)
|August 26, 2023
PubMed
Summary

Surface-Enhanced Infrared Absorption (SEIRA) spectroscopy amplifies weak molecular signals using nanostructures. This review explores SEIRA

Keywords:
2D materialchirallight–matter interactionmachine learningmetamaterialsnanophotonicsplasmonicsensorsurface-enhanced infrared absorption

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Area of Science:

  • Spectroscopy
  • Nanotechnology
  • Sensing

Background:

  • Infrared absorption spectroscopy offers molecule detection but suffers from low sensitivity due to small absorption cross-sections.
  • Low signal-to-noise ratios limit traditional infrared spectroscopy applications for trace molecule detection.

Purpose of the Study:

  • To review Surface-Enhanced Infrared Absorption (SEIRA) spectroscopy, a technique that amplifies vibrational signals of trace molecules.
  • To discuss SEIRA performance optimization strategies, potential applications, and future trends in miniaturized and intelligent systems.

Main Methods:

  • Review of SEIRA performance optimization through material selection, sensitivity enhancement, and bandwidth improvement.
  • Exploration of SEIRA applications in biomedicine and environmental monitoring.
  • Discussion of SEIRA integration with emerging technologies like the Internet of Things and machine learning.

Main Results:

  • SEIRA significantly enhances the sensitivity of infrared spectroscopy by leveraging nanostructure-induced electromagnetic field enhancement.
  • Optimization strategies can further improve SEIRA performance for diverse sensing needs.
  • SEIRA shows promise for advanced applications in healthcare and environmental science.

Conclusions:

  • SEIRA spectroscopy is a powerful tool for sensitive detection of trace molecules, overcoming limitations of conventional methods.
  • Future directions include miniaturization, integration with smart devices, and leveraging machine learning for advanced SEIRA systems.
  • SEIRA technology is poised for significant advancements, enabling novel applications in various fields.