Access Restriction

Author Sridharamurthy, S.S. ♦ Cadwell, K.D. ♦ Abbott, N.L. ♦ Hongrui Jiang
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2007
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Sensor arrays ♦ Liquid crystals ♦ Gas detectors ♦ Substrates ♦ Force sensors ♦ Chemical and biological sensors ♦ Nickel ♦ Chemical analysis ♦ Biochemical analysis ♦ Transistors
Abstract We present principles for the design of a vapor-phase chemical sensor based on orientational transitions of nematic liquid crystals (LC) supported by a microfabricated pillar array structure. These principles are demonstrated by using the structure to detect vapor-phase Di-methyl methyl phosphonate (DMMP) via change in the intensity of light transmitted through the LC (5CB: 4-pentyl-4-cyanobiphenyl). The micro-pillar support structure stabilizes a thin (-22 mum) LC film by capillary force. The structure offers easier filling of LC, reduced susceptibility to gravity and shock, and is capable of embedding different thicknesses of LC films. Concentrations down to 10 ppm of DMMP were detected.
Description Author affiliation: Univ. of Wisconsin-Madison, Madison (Sridharamurthy, S.S.)
ISBN 9781424412617
ISSN 19300395
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2007-10-28
Publisher Place USA
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Size (in Bytes) 734.73 kB
Page Count 4
Starting Page 1044
Ending Page 1047

Source: IEEE Xplore Digital Library