Diffractive optical chemical sensor based on light absorption

Fumihiro Nakajima; Yasuyuki Hirakawa; Takashi Kaneta; Totaro Imasaka

doi:10.1021/ac990216n

Diffractive optical chemical sensor based on light absorption

Fumihiro Nakajima, Yasuyuki Hirakawa, Takashi Kaneta, Totaro Imasaka

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	2262-2265
Number of pages	4
Journal	Analytical Chemistry
Volume	71
Issue number	13
DOIs	https://doi.org/10.1021/ac990216n
Publication status	Published - Jan 1 1999
Externally published	Yes

ASJC Scopus subject areas

Analytical Chemistry

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10.1021/ac990216n

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Diffractive optical chemical sensor based on light absorption

Abstract

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