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Related Concept Videos

IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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IR Frequency Region: Alkyne and Nitrile Stretching01:22

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Both alkyne (C≡C) and nitrile (C≡N) functional groups contain triple bonds and show stretching absorptions around the wavenumber range of 2100 to 2300 cm−1 in the diagnostic region of the IR spectra.
Comparing the stretching vibrational frequency of  C≡C triple bonds with that of double and single bonds, it is evident that C≡C triple bonds exhibit a higher stretching frequency than C=C double and C–C single bonds. Similarly, the C≡N triple bond...
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IR Frequency Region: Alkene and Carbonyl Stretching01:29

IR Frequency Region: Alkene and Carbonyl Stretching

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Double bonds in alkenes and carbonyl compounds exhibit stretching frequencies in the diagnostic region of the IR spectrum. In addition, alkenes exhibit vinylic C–H stretching and C–H out-of-plane bending absorptions that are useful for identifying substitution patterns.
Stretching frequencies are affected by several factors, such as resonance, inductive effects, ring strain, dipole moment, and hydrogen bonding. Consequently, the stretching frequency of the carbonyl double bond...
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Related Experiment Video

Updated: Jan 28, 2026

Fabricating Metamaterials Using the Fiber Drawing Method
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Published on: October 18, 2012

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Quasi-3D Plasmonic Metamaterials with Highly Stretch-Tunable Optical Responses.

I-Chen Chen1, Yu-Chi Huang1, Wei-Ting Chao1

  • 1Institute of Materials Science and Engineering, National Central University, Zhongli 320, Taiwan.

ACS Applied Materials & Interfaces
|January 27, 2026
PubMed
Summary

Researchers developed mechanically reconfigurable plasmonic nanocomposites using liquid gallium nanoparticles (GaNPs) in a polymer matrix. These metamaterials show a large, reversible spectral shift under strain, advancing tunable plasmonics.

Keywords:
3D stacked nanoparticlesactive plasmonic metamaterialsgallium nanoparticlesliquid metal nanocompositesplasmon polaritons

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Three-dimensional (3D) metal nanoparticle (NP) assemblies are crucial for optoelectronics and sensing.
  • Achieving uniform, sub-10 nm interparticle spacing in tunable media for plasmonic metamaterials is challenging.

Purpose of the Study:

  • To create mechanically reconfigurable plasmonic nanocomposites with tunable optical properties.
  • To investigate the strain-induced modulation of plasmonic coupling in 3D nanoparticle architectures.

Main Methods:

  • Fabrication of gallium nanoparticle (GaNP)/polydimethylsiloxane (PDMS) nanocomposites via single-step Ga evaporation.
  • Characterization of multilayered NP architectures and interparticle spacing.
  • Application of biaxial strain to induce spectral shifts and FDTD simulations to analyze plasmonic coupling.

Main Results:

  • The GaNP/PDMS nanocomposites formed quasi-3D plasmonic metamaterials with narrow interparticle spacing.
  • Collective plasmon resonances hybridized with cavity modes, forming plasmon-polariton states.
  • Biaxial strain induced a reversible spectral shift exceeding 300 nm due to modulated intra- and interlayer plasmonic coupling.

Conclusions:

  • The study presents a novel method for creating mechanically tunable plasmonic metamaterials.
  • Understanding nanoparticle-polymer interactions is advanced.
  • These findings support the development of advanced, strain-tunable optoelectronic and sensing devices.