Optical acetone vapor sensors based on chiral nematic liquid crystals and reactive chiral dopants

P. Cachelin, J.P. Green, T. Peijs, M. Heeney, C.W.M. Bastiaansen

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)
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Abstract

Accurate monitoring of exposure to organic vapors, such as acetone, is an important part of maintaining a safe working environment and adhering to long- and short-term exposure limits. Here, a novel acetone vapor detection system is described based on the use of a reactive chiral dopant in a nematic liquid crystal thin film, which can accurately monitor the total exposure over a given time frame through changes in the reflection band of the film. It is found that films exposed to 1000 parts per million by volume (ppmv) of acetone vapor for 2 h exhibit a shift in reflection band of 12 nm, with smaller shifts observed at lower concentrations of acetone. Such sensors have potential applications in industrial hygiene. A novel sensor based on a chiral nematic liquid crystal doped with a reactive dopant is fabricated and investigated. It is found that the sensor acts as a real-time integrator, responding to the total acetone dose by changing the wavelength of the reflection maximum of the chiral nematic liquid crystal. The sensitivity and cross-sensitivity of the sensor are investigated.

Original languageEnglish
Pages (from-to)592-596
Number of pages5
JournalAdvanced Optical Materials
Volume4
Issue number4
DOIs
Publication statusPublished - 1 Apr 2016

Fingerprint

Nematic liquid crystals
Acetone
acetone
Vapors
liquid crystals
Doping (additives)
vapors
sensors
Sensors
hygiene
Industrial hygiene
shift
integrators
Dosimetry
low concentrations
Thin films
Wavelength
dosage
Monitoring
sensitivity

Keywords

  • Acetone vapor
  • Chemosensors
  • Chiral nematic liquid crystals
  • Sensors

Cite this

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abstract = "Accurate monitoring of exposure to organic vapors, such as acetone, is an important part of maintaining a safe working environment and adhering to long- and short-term exposure limits. Here, a novel acetone vapor detection system is described based on the use of a reactive chiral dopant in a nematic liquid crystal thin film, which can accurately monitor the total exposure over a given time frame through changes in the reflection band of the film. It is found that films exposed to 1000 parts per million by volume (ppmv) of acetone vapor for 2 h exhibit a shift in reflection band of 12 nm, with smaller shifts observed at lower concentrations of acetone. Such sensors have potential applications in industrial hygiene. A novel sensor based on a chiral nematic liquid crystal doped with a reactive dopant is fabricated and investigated. It is found that the sensor acts as a real-time integrator, responding to the total acetone dose by changing the wavelength of the reflection maximum of the chiral nematic liquid crystal. The sensitivity and cross-sensitivity of the sensor are investigated.",
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Optical acetone vapor sensors based on chiral nematic liquid crystals and reactive chiral dopants. / Cachelin, P.; Green, J.P.; Peijs, T.; Heeney, M.; Bastiaansen, C.W.M.

In: Advanced Optical Materials, Vol. 4, No. 4, 01.04.2016, p. 592-596.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Cachelin, P.

AU - Green, J.P.

AU - Peijs, T.

AU - Heeney, M.

AU - Bastiaansen, C.W.M.

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N2 - Accurate monitoring of exposure to organic vapors, such as acetone, is an important part of maintaining a safe working environment and adhering to long- and short-term exposure limits. Here, a novel acetone vapor detection system is described based on the use of a reactive chiral dopant in a nematic liquid crystal thin film, which can accurately monitor the total exposure over a given time frame through changes in the reflection band of the film. It is found that films exposed to 1000 parts per million by volume (ppmv) of acetone vapor for 2 h exhibit a shift in reflection band of 12 nm, with smaller shifts observed at lower concentrations of acetone. Such sensors have potential applications in industrial hygiene. A novel sensor based on a chiral nematic liquid crystal doped with a reactive dopant is fabricated and investigated. It is found that the sensor acts as a real-time integrator, responding to the total acetone dose by changing the wavelength of the reflection maximum of the chiral nematic liquid crystal. The sensitivity and cross-sensitivity of the sensor are investigated.

AB - Accurate monitoring of exposure to organic vapors, such as acetone, is an important part of maintaining a safe working environment and adhering to long- and short-term exposure limits. Here, a novel acetone vapor detection system is described based on the use of a reactive chiral dopant in a nematic liquid crystal thin film, which can accurately monitor the total exposure over a given time frame through changes in the reflection band of the film. It is found that films exposed to 1000 parts per million by volume (ppmv) of acetone vapor for 2 h exhibit a shift in reflection band of 12 nm, with smaller shifts observed at lower concentrations of acetone. Such sensors have potential applications in industrial hygiene. A novel sensor based on a chiral nematic liquid crystal doped with a reactive dopant is fabricated and investigated. It is found that the sensor acts as a real-time integrator, responding to the total acetone dose by changing the wavelength of the reflection maximum of the chiral nematic liquid crystal. The sensitivity and cross-sensitivity of the sensor are investigated.

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