Disposable electrochromic polyaniline sensor based on a redox response using a conventional camera: A first approach to handheld analysis

Please use this identifier to cite or link to this item: http://hdl.handle.net/10045/44128
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Title: Disposable electrochromic polyaniline sensor based on a redox response using a conventional camera: A first approach to handheld analysis
Authors: Porcel-Valenzuela, María | Ballesta-Claver, Julio | Orbe-Payá, Ignacio de | Montilla, Francisco | Capitán-Vallvey, Luis Fermín
Research Group/s: Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Electropolymerization | Disposable sensor | Digital camera | Electrochromism | Ascorbic acid | Hue parameter
Knowledge Area: Química Física
Issue Date: 1-Feb-2015
Publisher: Elsevier
Citation: Journal of Electroanalytical Chemistry. 2015, 738: 162-169. doi:10.1016/j.jelechem.2014.12.002
Abstract: We present a disposable optical sensor for Ascorbic Acid (AA). It uses a polyaniline based electrochromic sensing film that undergoes a color change when exposed to solutions of ascorbic acid at pH 3.0. The color is monitored by a conventional digital camera working with the hue (H) color coordinate. The electrochromic film was deposited on an Indium Tin Oxide (ITO) electrode by cyclic voltammetry and then characterized by atomic force microscopy, electrochemical and spectroscopic techniques. An estimation of the initial rate of H, as ΔH/Δt, is used as the analytical parameter and resulted in the following logarithmic relationship: ΔH/Δt = 0.029 log[AA] + 0.14, with a limit of detection of 17 μM. The relative standard deviation when using the same membrane 5 times was 7.4% for the blank, and 2.6% (for n = 3) on exposure to ascorbic acid in 160 μM concentration. The sensor is disposable and its applicability to pharmaceutical analysis was demonstrated. This configuration can be extended for future handheld configurations.
Sponsor: We acknowledge financial support from the Junta de Andalucía (Proyecto de Excelencia P10-FQM-5974) and from the Ministerio de Economía y Competitividad (CTQ2013-44545-R). These projects were partially supported by European Regional Development Funds (ERDF).
URI: http://hdl.handle.net/10045/44128
ISSN: 1572-6657 (Print) | 1873-2569 (Online)
DOI: 10.1016/j.jelechem.2014.12.002
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.jelechem.2014.12.002
Appears in Collections:INV - GEPE - Artículos de Revistas

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