Novel optical NO2-selective sensor based on phthalocyaninato-iron(II) incorporated into a nanostructured matrix

被引:24
作者
Fernández-Sánchez, JF
Nezel, T
Steiger, R
Spichiger-Keller, UE
机构
[1] Swiss Fed Inst Technol, Ctr Chem Sensors, CH-8005 Zurich, Switzerland
[2] Univ Granada, Fac Sci, Dept Analyt Chem, E-18071 Granada, Spain
关键词
NO2; sensor; nanostructure; aluminum oxide hydroxide; phthalocyaninato-iron(II); gas analysis;
D O I
10.1016/j.snb.2005.07.012
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A novel highly sensitive optical NO2-selective sensor was developed using phthalocyaninato-iron(II) as a selective complexing agent. In order to solubilize the iron(II+)phthalocyanine and to obtain the monomer species, a N-donor ligand was used as a solvent. The membrane solution was deposited onto a novel aluminum oxide/hydroxide nanoporous material by a spin-coating technique. The chemical reaction principle and the preparation of this new sensor are presented in detail. The effect of the type and concentration of the N-donor ligand, and the influence of the iron phthalocyanine concentration were investigated as well as the effect of the composition and the morphological characteristics of the nanostructured material. In addition, the influence of some relevant external parameters such as flow-rate and interfering compounds were investigated. The results show that the sensor responds to NO2 concentrations in the gas phase between 5 x 10(-3) ppm and > 0.5 ppm with a linear concentration range between 2 x 10(-2) and 0.4 ppm, the detection limit being at 20 ppb. The dynamic range it is not influenced by the flow-rate, by humidity, NO, CO, CO2 and SO2, and the NO2-selective optical sensor shows good stability to ambient in view of a long lifetime as a gas and fire alarm detector. Generally 1 ppm NO2 gas corresponds to 2.0 mg m(-3) and 44.5 x 10(-6) mol m(-3). (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:630 / 638
页数:9
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