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Reversibly Switching Molecular Spectra.

Yong Zhang1, Hulie Zeng1, Sifeng Mao1

  • 1Department of Applied Chemistry, Graduate School of Urban Environmental Sciences , Tokyo Metropolitan University , 1-1 Minamiosawa , Hachioji , Tokyo 192-0397 , Japan.

ACS Applied Materials & Interfaces
|June 21, 2018
PubMed
Summary

Researchers used an electric field to control molecular spectra via electroresponsible polymer brushes. This electroswitchable control of UV-vis absorbance and fluorescence emission offers new possibilities for smart windows and advanced optical applications.

Keywords:
electrocontrollable assemblyelectrocontrollable spectrumelectroswitchable aggregateelectroswitchable molecular spectrumpoly-AHPSpolymer brush

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Polymer Chemistry

Background:

  • Light manipulation is crucial for smart windows and display technologies.
  • Controlling molecular spectra with external stimuli is an active research area.

Purpose of the Study:

  • To demonstrate the reversible switching of molecular spectra using an external electric field.
  • To investigate the role of electroresponsible polymer brushes in this spectral switching.

Main Methods:

  • Utilized an external electric field to interact with a model molecule and an electroresponsible polymer brush (poly-allyloxy hydroxypropyl sulfonate).
  • Measured changes in UV-vis absorbance and fluorescence emission spectra.
  • Analyzed the influence of the polymer brush's electroswitchable status on molecular aggregation and spectral properties.

Main Results:

  • Confirmed that both UV-vis absorbance and fluorescence emission spectra of the model molecule are electroswitchable.
  • Demonstrated that the electroswitchable polymer brush (poly-AHPS) induces these spectral changes.
  • Showcased electrical control over the aggregation state of proflavine molecules, leading to controllable spectral shifts.

Conclusions:

  • Successfully manipulated molecular spectra using an external electric field and electroresponsible polymer brushes.
  • The findings open avenues for applications in displays, nonlinear optics, in vivo imaging, sensors, and environmental inspection.