Diffractive Optical Chemical Sensor Based on Light Absorption

A new type of chemical sensor based on light absorption is proposed. An array of zones alternatively containing the pH indicator thymolphthalein is formed in a gelatin film. By changing the sample solution from acidic to alkaline, a blue stripe appears in the gelatin film. This acts as a transmissio...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 1999-07, Vol.71 (13), p.2262-2265
Main Authors: Nakajima, Fumihiro, Hirakawa, Yasuyuki, Kaneta, Takashi, Imasaka, Totaro
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
General, instrumentation
Light
Sensors
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Summary:A new type of chemical sensor based on light absorption is proposed. An array of zones alternatively containing the pH indicator thymolphthalein is formed in a gelatin film. By changing the sample solution from acidic to alkaline, a blue stripe appears in the gelatin film. This acts as a transmission grating and diffracts the introduced laser beam. Theory predicts that this method, which is based on light absorption/beam diffraction, is as sensitive as or more sensitive than fluorometry.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac990216n