Feasibility of using liquid crystals for the development of molecularly selective fiber-optic chemical sensors

Journal Article · Mon Oct 01 00:00:00 EDT 1990 · Analytical Chemistry (Washington); (USA)

DOI:https://doi.org/10.1021/ac00218a006· OSTI ID:6287593

Zhu, Chu; Hieftje, G M ^[1]

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1. Indiana Univ., Bloomington (USA)

A new type of fiber-optic chemical sensor has been developed for the determination and differentiation of geometric isomers. The operation of the sensor is based upon the molecular-geometric-selective absorption of polynuclear aromatic hydrocarbons (PAH) on a liquid crystal. The selective interaction of a PAH with a liquid-crystal substrate causes quenching of the liquid-crystal fluorescence. Detection limits of such a device for PAH compounds approach 10{sup {minus}10} mol/cm{sup 3}; the sensor response time is about 2 min. Because the sensor is based upon physical absorption, it is reusable and reversible.

• OSTI ID: 6287593
• Journal Information: Analytical Chemistry (Washington); (USA), Vol. 62:19; ISSN 0003-2700
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
POLYCYCLIC AROMATIC HYDROCARBONS
DETECTION
EXPERIMENTAL DATA
FIBER OPTICS
ISOMERS
LIQUID CRYSTALS
MEASURING METHODS
AROMATICS
CRYSTALS
DATA
FLUIDS
HYDROCARBONS
INFORMATION
LIQUIDS
NUMERICAL DATA
ORGANIC COMPOUNDS
400102* - Chemical & Spectral Procedures