Optical and Electrochemical Combination Sensor with Poly‐Aniline Film Modified Gold Surface and Its Application for Dissolved Oxygen Detection |
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| Authors: | Meng Li Wei Liu Jorge PCorreia Ana C Mourato Ana S Viana Gang Jin |
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| Institution: | 1. NML, Institute of Mechanics, Chinese Academy of Sciences, 15 Bei‐si‐huan West Rd, Beijing 100190, P.?R. China;2. University of the Chinese Academy of Sciences, 19 Yu‐quan Road, Beijing 100049, P.?R. China;3. CQB, Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade de Lisboa, Edifício C8, Campo Grande, 1749‐016 Lisboa, Portugal |
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| Abstract: | Poly‐aniline (PAn) film can be oxidized by contacting oxygen in an electron‐transfer reaction and its redox state, for instance the open circuit potential and the dielectric constant, is quantitatively related to oxygen concentration. This feature may contribute to an improved application of dissolved oxygen (DO) detection with the combined optical and electrochemical sensor. In this paper, PAn is used as a sensing surface to detect DO by the combination sensor composed of electrochemistry and total internal reflection imaging ellipsometry (EC‐TIRIE). Results demonstrate that both optical and electrical signals show a logarithmic correlation with DO concentration (0–20 ppm). Compared with the results obtained only with the gold surface, both the optical and electrical signals of the EC‐TIRIE sensor for DO detection are amplified with the PAn modified gold surface. |
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| Keywords: | Combined optical and electrochemical sensor Dissolved oxygen Electrochemistry Poly‐aniline Total internal reflection imaging ellipsometry |
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