Comparison of NO2 and NH3 gas adsorption on semiconductor polyaniline thin films
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Sociedad Mexicana de Física A.C.
2005
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| _version_ | 1876452955957231616 |
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| author | J. Elizalde-Torres |
| author_facet | J. Elizalde-Torres |
| contents | Comparison of NO2 and NH3 gas adsorption on semiconductor polyaniline thin films J. Elizalde-Torres H. Hu J.M. Saniger Física, Astronomía y Matemáticas UV VIS and FT IR spectra Polyaniline thin films NO2 and NH3 gas detection Semiconductor polyaniline (PANI) thin films have proven to be an optically sensitive element for detecting gaseous NH3 and NO2 at roomtemperature. Although the absorption of either of them on PANI films results in the color change of the films, from green to blue, themechanism of the interaction of each gas with the polymer is different. Ultra-violet (UV)-Visible (VIS) spectra of the NO2 saturated PANIthin films give an increasing blue shift of the polaron band (1.5 eV) as a function of the gas concentration. The NH3 gas saturated PANIsamples, however, show a small red shift of the same absorption band and a slight increase of the relative intensity of the 2.0 eV band.It is suggested that NO2 oxidizes the semiconductor PANI just as this can be oxidized by an electrochemical potential in an aqueous acidsolution, whereas NH3 deprotonates the polymer without taking out any electrons from it. The presence of NH+4 and of NO¡2 species in thegas saturated PANI samples is shown by the analysis of their Fourier Transform Infrared (FT-IR) spectra. 2005 artículo científico 0035-001X https://www.redalyc.org/articulo.oa?id=57064107 https://www.redalyc.org/journal/570/57064107/ https://www.redalyc.org/journal/570/57064107/html/ https://www.redalyc.org/journal/570/57064107/57064107.epub https://www.redalyc.org/journal/570/57064107/movil en http://www.redalyc.org/revista.oa?id=570 Revista Mexicana de Física application/pdf Sociedad Mexicana de Física A.C. Revista Mexicana de Física (México) Num.5 Vol.51 |
| format | Artículo científico |
| id | redalyc_57064107 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Sociedad Mexicana de Física A.C. |
| spellingShingle | Comparison of NO2 and NH3 gas adsorption on semiconductor polyaniline thin films J. Elizalde-Torres Física, Astronomía y Matemáticas UV VIS and FT IR spectra Polyaniline thin films NO2 and NH3 gas detection Comparison of NO2 and NH3 gas adsorption on semiconductor polyaniline thin films J. Elizalde-Torres H. Hu J.M. Saniger Física, Astronomía y Matemáticas UV VIS and FT IR spectra Polyaniline thin films NO2 and NH3 gas detection Semiconductor polyaniline (PANI) thin films have proven to be an optically sensitive element for detecting gaseous NH3 and NO2 at roomtemperature. Although the absorption of either of them on PANI films results in the color change of the films, from green to blue, themechanism of the interaction of each gas with the polymer is different. Ultra-violet (UV)-Visible (VIS) spectra of the NO2 saturated PANIthin films give an increasing blue shift of the polaron band (1.5 eV) as a function of the gas concentration. The NH3 gas saturated PANIsamples, however, show a small red shift of the same absorption band and a slight increase of the relative intensity of the 2.0 eV band.It is suggested that NO2 oxidizes the semiconductor PANI just as this can be oxidized by an electrochemical potential in an aqueous acidsolution, whereas NH3 deprotonates the polymer without taking out any electrons from it. The presence of NH+4 and of NO¡2 species in thegas saturated PANI samples is shown by the analysis of their Fourier Transform Infrared (FT-IR) spectra. 2005 artículo científico 0035-001X https://www.redalyc.org/articulo.oa?id=57064107 https://www.redalyc.org/journal/570/57064107/ https://www.redalyc.org/journal/570/57064107/html/ https://www.redalyc.org/journal/570/57064107/57064107.epub https://www.redalyc.org/journal/570/57064107/movil en http://www.redalyc.org/revista.oa?id=570 Revista Mexicana de Física application/pdf Sociedad Mexicana de Física A.C. Revista Mexicana de Física (México) Num.5 Vol.51 |
| title | Comparison of NO2 and NH3 gas adsorption on semiconductor polyaniline thin films |
| topic | Física, Astronomía y Matemáticas UV VIS and FT IR spectra Polyaniline thin films NO2 and NH3 gas detection |
| url | https://www.redalyc.org/articulo.oa?id=57064107 https://www.redalyc.org/journal/570/57064107/ https://www.redalyc.org/journal/570/57064107/html/ https://www.redalyc.org/journal/570/57064107/57064107.epub https://www.redalyc.org/journal/570/57064107/movil |