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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

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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.
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IR Spectrometers01:25

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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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IR Spectroscopy: Molecular Vibration Overview01:24

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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 Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
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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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Liquid and gas mid-infrared integrated spectroscopic sensor.

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    Mid-infrared waveguide sensors using chalcogenide glasses and porous silicon were developed. Porous silicon offered superior CO2 detection limits due to enhanced light-matter interaction within its structure.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Chemical Sensing

    Background:

    • Mid-infrared (mid-IR) spectroscopy is crucial for chemical analysis.
    • Developing efficient waveguide sensors for mid-IR applications is an active research area.

    Purpose of the Study:

    • To fabricate and compare mid-infrared waveguide sensors based on chalcogenide glasses (ChGs) and porous silicon (PSi) platforms.
    • To evaluate their performance for liquid and gas sensing applications.

    Main Methods:

    • ChGs layers were deposited using RF magnetron sputtering; PSi layers were prepared by electrochemical anodization.
    • Ridge waveguides were patterned using photolithography and reactive ion etching.
    • Spectroscopic sensing experiments were conducted for liquid (acetonitrile, isopropanol) and gas (CO2) analytes.

    Main Results:

    • ChGs waveguides showed a transparency range of 3.94–8.95 µm with low propagation losses (2.5 dB/cm).
    • PSi waveguides had a transparency range of 3.94–4.55 µm with higher losses (9.1 dB/cm).
    • Sensors achieved limits of detection (LoD) for acetonitrile (610 ppm), isopropanol (300 ppm), and CO2 (17000 ppm on ChGs, 600 ppm on PSi).
    • PSi platform demonstrated significantly higher light-matter interaction for gas sensing due to its porous structure.

    Conclusions:

    • Both ChGs and PSi platforms are viable for mid-IR waveguide sensing.
    • The PSi platform offers superior performance for gas sensing applications, particularly CO2, due to enhanced light interaction.
    • The developed sensors demonstrate potential for analyzing complex mixtures in real-world environments.