Optoelectrochemical thin-film chlorine sensor employing evanescent fields

Piraud, Christophe, Mwarania, Eustace, Wylangowski, George, Wilkinson, James S., O'Dwyer, Kieran and Schiffrin, David J. (1992) Optoelectrochemical thin-film chlorine sensor employing evanescent fields. Analytical Chemistry, 64, (6), 651-655. (doi:10.1021/ac00030a015).


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A new type of optoelectrochemical sensor based on an electrochromic thin-film sensing layer placed on top of a planar waveguide has been developed. The oxidation state of the sensing film is quantitatively measured by the evanescent field of the light transmitted through the waveguide. The functioning of the device has been ascertained which dissolved chlorine, employing an electrochemically resettable film of lutetium biphthalocyanine. Detection of film oxidation has been carried out at 950 nm. This technique appears promising for the detection of residual chlorine, since only changes due to the sensing reaction are monitored. Although the device has not been optimized, a potential sensitivity below 1 ppm has been demonstrated. The integration of modem optical technology and electrochemical techniques for sensing applications appears to be a powerful new approach.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1021/ac00030a015
ISSNs: 0003-2700 (print)
1520-6882 (electronic)
Related URLs:
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions : University Structure - Pre August 2011 > Optoelectronics Research Centre
ePrint ID: 78363
Accepted Date and Publication Date:
March 1992Made publicly available
Date Deposited: 11 Mar 2010
Last Modified: 28 Sep 2016 09:30
URI: http://eprints.soton.ac.uk/id/eprint/78363

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