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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.
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IR Frequency Region: Fingerprint Region01:03

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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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Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties
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Polyaniline-Based Infrared Dynamic Patterned Encoder with Multiple Thermal Radiation Characteristics.

Zichen Ren1, Gaoping Xu2, Bo Wang2

  • 1School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China.

ACS Applied Materials & Interfaces
|March 8, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel infrared dynamic patterned encoder using polyaniline. This device can switch between visible and concealed infrared patterns, offering new possibilities for information transfer and thermal management.

Keywords:
IR information transferPANIin situ polymerizationmultiple thermal radiation characteristicsthermal management

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Fabricating infrared dynamic patterned encoders (IR-DPEs) for energy-harvesting and information transfer presents significant challenges.
  • Polyaniline (PANI) is a promising material for advanced applications, but its integration into IR-DPEs requires innovative fabrication methods.

Purpose of the Study:

  • To develop a simple and reliable fabrication method for IR-DPEs with multiple thermal radiation characteristics.
  • To explore the relationship between material properties and infrared emissivity for tunable thermal radiation.

Main Methods:

  • Utilized electron-beam evaporation to deposit divanadium pentoxide (V2O5) coatings on a substrate.
  • Employed V2O5 as an oxidant for in situ polymerization of polyaniline (PANI), creating a PANI film.
  • Investigated the influence of V2O5 thickness on PANI emissivity to achieve multiple emissivity levels.

Main Results:

  • Achieved an IR-DPE with up to six distinct emissivity levels, enabling integrated IR patterns with multiple thermal radiation characteristics.
  • Demonstrated a switchable IR pattern: visible in the oxidized state and concealed in the reduced state.
  • Attained high emissivity tunability from 0.40 to 0.82 (Δε = 0.42) in the 2.5-25 μm range.
  • Exhibited a maximum temperature control of 5.9 °C.

Conclusions:

  • The developed fabrication method offers a viable route for creating advanced IR-DPEs.
  • The PANI-based IR-DPE shows significant potential for applications in infrared information transfer and thermal management.
  • The tunable emissivity and switchable IR patterns open new avenues for smart material design.