Optical Waveguide BTX Gas Sensor Based on Polyacrylate Resin Thin Film

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• 作者：Razak Kadir ; Abliz Yimit ; Hayrensa Ablat ; Mamtimin Mahmut ; Kiminori Itoh
• 刊名：Environmental Science & Technology
• 出版年：2009
• 出版时间：July 1, 2009
• 年：2009
• 卷：43
• 期：13
• 页码：5113-5116
• 全文大小：167K
• 年卷期：v.43,no.13(July 1, 2009)
• ISSN：1520-5851

文摘

An optical sensor sensitive to BTX has been developed by spin coating a thin film of polyacrylate resin onto a tin- diffused glass optical waveguide. A pair of prism coupler was employed for optical coupling matched with diiodomethane (CH₂I₂). The guided wave transmits in waveguide layer and passes through the film as an evanescent wave. Polyacrylate film has a strong capacity of absorbing oil gases. The film is stable in N₂ but benzene exposure at room temperature can result in rapid and reversible changes of transmittance (T) and refractive index (n₁) of this film. It has been demonstrated that the sensor containing a 10 mm board and about a hundred nanometers thick resin film can detect lower than 8 ppm BTX.