Nanoassembled Thin-Film Gas Sensor II . An Intrinsic Highly Sensitive Fibre Optic Sensor for Ammonia Detection
Nanoassembled Thin-Film Gas Sensor II . An Intrinsic Highly Sensitive Fibre Optic Sensor for Ammonia Detection
复制标题
纳米组装薄膜气体传感器 II 。
作者：
S. Korposh;S. Kodaira;W. Batty;S. James;Seung
采用逐层沉积的方法在去除包层的多模光纤上沉积纳米厚度的涂层，以实现光纤氨传感器。该膜与四-（4-磺基苯基）卟啉（TSPP）和聚（二烯丙基二甲基氯化铵）（PDDA）的交替层自组装。将组装膜暴露于氨引起涂覆光纤的透射光谱的光学变化，反映组装TSPP化合物的特征吸收带（Soret和Q带）。该光纤传感器在706 nm波长处对0.1 ~ 20 ppm的氨具有良好的线性响应，响应时间和恢复时间均小于3 min，检测限为0.9ppm。
A layer-by-layer approach was used for the deposition of coatings with a nanometre thickness onto a multimode optical fi bre, from which the cladding had been removed, with the aim of realizing a fi bre optic ammonia sensor. The fi lm was self-assembled with alternate layers of tetrakis-(4-sulfophenyl) porphine (TSPP) and poly(diallyldimethyla mmonium chloride) (PDDA). The exposure of the assembled fi lm to ammonia induced optical changes in the transmission spectrum of the coated optical fi bre, refl ecting the characteristic absorption bands (Soret and Q bands) of the assembled TSPP compound. The fi bre optic sensor showed a linear sensitivity to ammonia in the concentration range of 0.1–20 ppm and the response and recovery times were less than 3 min with a limit of detection of 0.9 ppm at 706 nm.