A transparent TMPyP/TiO2 composite thin film as an HCl sensitive optochemical gas sensor

被引：59

作者：

Cano, Manuel ^{[1
,2
]}

Castillero, Pedro ^{[1
,3
]}

Roales, Javier ^{[1
]}

Pedrosa, Jose M. ^{[1
]}

Brittle, Stuart ^{[2
]}

Richardson, Tim ^{[2
]}

Gonzalez-Elipe, Agustin R. ^{[3
]}

Barranco, Angel ^{[3
]}

机构：

[1] Univ Pablo de Olavide, Dept Sistemas Fis Quim & Nat, Seville 41013, Spain

[2] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England

[3] Univ Seville, CSIC, Inst Ciencia Mat Sevilla, E-41092 Seville, Spain

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2010年 / 150卷 / 02期

基金：

英国工程与自然科学研究理事会;

关键词：

NCl; Optical gas sensor; Tetracationic porphyrin; TMPyP/TiO2; composite; Porous thin film; GAPVD; FREE-BASE; PORPHYRINS;

D O I：

10.1016/j.snb.2010.07.059

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Tetracationic porphyrin (TMPyP) molecules were incorporated Into an optically transparent TiO2 thin film prepared by Glancing Angle Physical Vapour Deposition (GAPVD) by simple infiltration (at pH 6 4) The preparation of optically transparent TMPyP/TiO2 composite thin films provides a method for the integration of the porphyrin molecules Into photonic devices for direct monitoring of gases Previously UV-visible and fluorescence spectral techniques have been used to study the reversible protonation of TMPyP in aqueous solution The optical spectrum of TMPyP shows an intense Soret band at 423 nm with a 22 nm red shift upon protonation by HCl The experimental conditions for monitoring the concentration of HCl gas by absorption spectroscopy have been optimized The maximum absorbance change was observed at the Sorer band wavelength A selected temperature of 80 C and a 300 s recovery period were found to be the optimum operating parameters (response time t(50) = 16 8 +/- 7 s) The composite with smaller surface concentration of TMPyP (Gamma = 03 x 10(-9) mol cm(-2)) presented the best detection limit (0 1 ppm) The response of the composite sensor was highly stable for several months (c) 2010 Elsevier B V All rights reserved

引用

页码：764 / 769

页数：6

共 16 条

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