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Related Concept Videos

Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Polymers02:34

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UV–Vis Spectrum01:30

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When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
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UV–Vis Spectrometers01:14

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
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IR and UV–Vis Spectroscopy of Aldehydes and Ketones01:29

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Infrared spectroscopy, also known as vibrational spectroscopy, is mainly used to determine the types of bonds and functional groups in molecules. In aldehydes and ketones, the carbonyl (C=O) bond shows an absorption around 1710 cm-1. The C=O bond vibration of an aldehyde occurs at lower frequencies than that of a ketone. In addition to the C=O absorption in an aldehyde, the aldehydic C–H bond also gives two peaks in the 2700–2800 cm-1 range. This absorption, coupled with the...
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Using Adhesive Patterning to Construct 3D Paper Microfluidic Devices
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Greyscale and Paper Electrochromic Polymer Displays by UV Patterning.

Robert Brooke1,2, Jesper Edberg3,4, Xavier Crispin5

  • 1Laboratory of Organic Electronics, Department of Science and Technology, Linkoping University, SE-601 74 Norrkoping, Sweden. robert.brooke@ri.se.

Polymers
|April 10, 2019
PubMed
Summary

Researchers developed novel organic electrochromic devices capable of displaying high-resolution, switchable greyscale images. This advancement utilizes UV-patterning and vapor phase polymerization for energy-efficient displays on functional paper.

Keywords:
PEDOTcelluloseconductive polymersdigital celluloseelectrochromicelectrochromic displayselectrochromismpaper displayspaper electronicspatterningvapor phase polymerization

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Device Engineering

Background:

  • Organic conductive polymers offer advantages over inorganics for electrochromic devices, including high throughput, low-temperature processing, and superior optical memory.
  • Current applications include smart windows, IoT devices, and low-cost advertising, with a need for improved image resolution and display flexibility.

Purpose of the Study:

  • To present organic electrochromic devices capable of switching between two high-resolution images.
  • To demonstrate greyscale image switching via controlled UV-light exposure.
  • To explore environmentally friendly electrochromic display applications using functional paper.

Main Methods:

  • Utilized UV-patterning combined with vapor phase polymerization of poly(3,4-ethylenedioxythiophene) films.
  • Achieved spatial control of greyscale by modulating UV-light dose.
  • Optimized oxidant concentration to alter the color space of the electrochromic films.
  • Deposited electrochromic patterns onto porous paper for functional paper displays.

Main Results:

  • Successfully created organic electrochromic devices that switch between two high-resolution images.
  • Demonstrated switchable greyscale images through precise spatial control of UV-light dose.
  • Achieved tunable color space by adjusting oxidant concentration.
  • Fabricated functional paper with electrochromic patterns for environmentally friendly displays.

Conclusions:

  • UV-patterning and vapor phase polymerization enable high-resolution, switchable organic electrochromic devices.
  • The developed technique allows for greyscale imaging and color tuning.
  • Functional paper displays offer a promising route for sustainable and versatile electrochromic applications.