Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9700984 | Sensors and Actuators B: Chemical | 2005 | 7 Pages |
Abstract
A new vapochromic material based on a gold-silver complex and diphenylacetyl, of formula [Au2Ag2(C6F5)4(C6H5CCC6H5)], has been developed and used for the detection of some volatile organic compounds (VOCs). The material is presented in the form of dark green powders. When the powders are in presence of VOC, its colour changes, yielding to a change in its optical properties. The sensor consists of an optical fibre pigtail onto the cleaved end of which the vapochromic material was deposited. The fibre has a core diameter of 200 μm and a plastic cladding. A commercially available solvent, Liquicoatc is used to create a solution, capable of being fixed onto the fibre. The fibre optic sensor is employed in a reflection scheme, so the other extreme of the optical fibre pigtail is connected to an optical coupler, completing the set-up with an optical source to generate the interrogating signal and an optical detector to measure the received intensity-modulated signal. The behavior of the sensor has been studied for different wavelengths for different concentrations of several VOC. Changes up to 2.5 dB in the reflected optical power were detected.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Cándido Bariain, Ignacio R. MatÃas, Carlos Fdez-Valdivielso, César Elosúa, Asunción Luquin, Julian Garrido, Mariano Laguna,