High-speed optical humidity sensors based on chiral sculptured thin films

Yan Jun Liu, Jinjie Shi, Fan Zhang, Huinan Liang, Jian Xu, Akhlesh Lakhtakia, Stephen J. Fonash, Tony Jun Huang

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

A high-speed humidity sensor based on a nanostructured chiral sculptured thin film (CSTF) was fabricated and tested. The sensing principle is based on the shift of the central wavelength of the circular Bragg regime of the CSTF caused by adsorption and desorption of water vapor in the void regions of the CSTF. Spectral changes due to varying relative-humidity (RH) levels in the ambient environment were measured by a spectrometer. The CSTF sensor exhibited excellent reversibility and reproducibility from 40% to 100% RH. Moreover, the adsorption time of the sensor was measured to be as low as ∼140 ms, making it promising for many high-speed humidity-sensing applications.

Original languageEnglish (US)
Pages (from-to)593-598
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume156
Issue number2
DOIs
StatePublished - Aug 1 2011

Fingerprint

Humidity sensors
Optical sensors
humidity
high speed
Thin films
Atmospheric humidity
sensors
thin films
Adsorption
adsorption
Sensors
Steam
Water vapor
water vapor
Spectrometers
voids
Desorption
desorption
spectrometers
Wavelength

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Liu, Yan Jun ; Shi, Jinjie ; Zhang, Fan ; Liang, Huinan ; Xu, Jian ; Lakhtakia, Akhlesh ; Fonash, Stephen J. ; Huang, Tony Jun. / High-speed optical humidity sensors based on chiral sculptured thin films. In: Sensors and Actuators, B: Chemical. 2011 ; Vol. 156, No. 2. pp. 593-598.
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High-speed optical humidity sensors based on chiral sculptured thin films. / Liu, Yan Jun; Shi, Jinjie; Zhang, Fan; Liang, Huinan; Xu, Jian; Lakhtakia, Akhlesh; Fonash, Stephen J.; Huang, Tony Jun.

In: Sensors and Actuators, B: Chemical, Vol. 156, No. 2, 01.08.2011, p. 593-598.

Research output: Contribution to journalArticle

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