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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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Threshold voltage decrease in a thermotropic nematic liquid crystal doped with graphene oxide flakes.

Mateusz Mrukiewicz1, Krystian Kowiorski2, Paweł Perkowski1

  • 1Institute of Applied Physics, Military University of Technology, 00-908 Warsaw, Poland.

Beilstein Journal of Nanotechnology
|January 26, 2019
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Graphene oxide (GO) flakes decrease the threshold voltage in liquid crystals (LCs) by disrupting alignment. This study investigates GO

Keywords:
graphene oxideliquid crystalnematic phaseswitchingthreshold voltage

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanoscience

Background:

  • Nematic liquid crystals (LCs) are widely used in display technologies.
  • Controlling LC properties with additives is crucial for performance enhancement.
  • Graphene oxide (GO) is a promising nanomaterial due to its unique electronic and structural properties.

Purpose of the Study:

  • To investigate the effect of graphene oxide (GO) doping on the threshold voltage of 4-cyano-4'-pentylbiphenyl (5CB) liquid crystals.
  • To analyze the influence of GO concentration on various electro-optic and dielectric properties of 5CB.
  • To understand the underlying mechanism of threshold voltage reduction in GO-doped 5CB.

Main Methods:

  • Electro-optic measurements
  • Dielectric spectroscopy
  • Atomic Force Microscopy (AFM)
  • Scanning Electron Microscopy (SEM)

Main Results:

  • A significant decrease in threshold voltage was observed in 5CB doped with 0.05-0.3 wt% GO.
  • GO doping disrupted the planar alignment of 5CB due to π-π stacking interactions.
  • GO concentration affected the isotropic-nematic phase transition temperature, electric anisotropy, and elastic constants.
  • Switching times (on and off) were also influenced by GO concentration.

Conclusions:

  • Graphene oxide effectively reduces the threshold voltage in nematic liquid crystals.
  • The observed effect is attributed to the disruption of LC alignment by GO flakes.
  • GO doping offers a viable route to tune the electro-optic performance of liquid crystal devices.