Plasma-deposited copper phthalocyanine: A single gas-sensing material with multiple responses
| Autor: | Gianluigi Maggioni, Michele Tonezzer, Alberto Quaranta, G. Della Mea, Sara Carturan |
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| Rok vydání: | 2008 |
| Předmět: |
Materials science
Optical gas sensing Metals and Alloys Analytical chemistry Ambientale Electrical gas sensing Light reflectance Plasma deposition Analytical Chemistry Electrochemistry Electrical and Electronic Engineering Plasma Gas concentration Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Wavelength Copper phthalocyanine Materials Chemistry Sublimation (phase transition) sense organs Thin film Porosity Instrumentation |
| Zdroj: | Sensors and Actuators B: Chemical. 131:496-503 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2007.12.020 |
| Popis: | Copper phthalocyanine (CuPc) thin films have been deposited by glow discharge-induced sublimation (GDS). This physical technique allows to produce very high porosity films, whose response to gases is much more intense than evaporated films. It has been found that both electrical and optical properties of these films change upon gas exposure due to the gas/film interaction. Electrical response of the films has been tested by exposing the samples to NO x -containing atmospheres and by measuring the slope of the electrical surface current versus gas concentration. This way NO 2 and NO concentrations down to 0.1 ppm and 10 ppm have been measured, respectively, with response times shorter than 2 min. Optical responses have been tested by measuring the change of light reflectance at a fixed wavelength upon exposure to ethanol-containing atmospheres down to concentrations of few thousands of ppm. Response times of less than 10 s have been obtained. |
| Databáze: | OpenAIRE |
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