Diffractive optical chemical sensor based on light absorption

被引：26

作者：

Nakajima, F ^{[1
]}

Hirakawa, Y ^{[1
]}

Kaneta, T ^{[1
]}

Imasaka, T ^{[1
]}

机构：

[1] Kyushu Univ, Grad Sch Engn, Dept Chem Syst & Engn, Fukuoka 812, Japan

来源：

ANALYTICAL CHEMISTRY | 1999年 / 71卷 / 13期

关键词：

D O I：

10.1021/ac990216n

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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.

引用

页码：2262 / 2265

页数：4

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