dor_id: 41503

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856.4.0.u: http://revistas.unam.mx/index.php/rmf/article/view/14348/13686

100.1.#.a: Elizalde Torres, J.; García Valenzuela, A.; Guadarrama Santana, A.; Hu, Hailin; Saniger, J. M.

524.#.#.a: Elizalde Torres, J., et al. (2008). Thermally assisted NO2 and NH3 gas desorption process in a polyaniline thin film based optochemical sensor. Revista Mexicana de Física; Vol 54, No 005. Recuperado de https://repositorio.unam.mx/contenidos/41503

245.1.0.a: Thermally assisted NO2 and NH3 gas desorption process in a polyaniline thin film based optochemical sensor

502.#.#.c: Universidad Nacional Autónoma de México

561.1.#.a: Facultad de Ciencias, UNAM

264.#.0.c: 2008

264.#.1.c: 2008-01-01

653.#.#.a: Polyaniline thin films; NO2 desorption process; activation energy for desorption; optochemical sensors

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041.#.7.h: eng

520.3.#.a: NO2 gas is a strong electron acceptor that can oxidize the chemically deposited semiconductor polyaniline (PANI) at room temperature under atmospheric pressure. Since each redox state of this polymer is associated with a specific electronic structure, an oxidized PANI thin film undergoes a color change that can be detected in a sensitive optochemical sensor. But the strongly absorbed NO2 molecules cannot be removed at room temperature from the polymer material during the purging process with a dried N2 gas flux. We report in this work that a heating element can be integrated into the optochemical sensor to elevate the sensing sample temperature during the desorption process. At temperatures higher than 50◦C, the optical signal of the NO2 absorbed PANI samples starts to return to its original value during the purging process, suggesting the desorption of the NO2 species from the PANI samples. The higher the heating temperature, the greater the activation energy for desorption, and consequently the faster the desorption speed. Similar results are also obtained for the NH3 desorption process occurring in the same polymer.

773.1.#.t: Revista Mexicana de Física; Vol 54, No 005 (2008)

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Artículo

Thermally assisted NO2 and NH3 gas desorption process in a polyaniline thin film based optochemical sensor

Elizalde Torres, J.; García Valenzuela, A.; Guadarrama Santana, A.; Hu, Hailin; Saniger, J. M.

Facultad de Ciencias, UNAM, publicado en Revista Mexicana de Física, y cosechado de Revistas UNAM

Licencia de uso

Procedencia del contenido

Entidad o dependencia
Facultad de Ciencias, UNAM
Revista
Repositorio
Contacto
Revistas UNAM. Dirección General de Publicaciones y Fomento Editorial, UNAM en revistas@unam.mx

Cita

Elizalde Torres, J., et al. (2008). Thermally assisted NO2 and NH3 gas desorption process in a polyaniline thin film based optochemical sensor. Revista Mexicana de Física; Vol 54, No 005. Recuperado de https://repositorio.unam.mx/contenidos/41503

Descripción del recurso

Autor(es)
Elizalde Torres, J.; García Valenzuela, A.; Guadarrama Santana, A.; Hu, Hailin; Saniger, J. M.
Tipo
Artículo de Investigación
Área del conocimiento
Físico Matemáticas y Ciencias de la Tierra
Título
Thermally assisted NO2 and NH3 gas desorption process in a polyaniline thin film based optochemical sensor
Fecha
2008-01-01
Resumen
NO2 gas is a strong electron acceptor that can oxidize the chemically deposited semiconductor polyaniline (PANI) at room temperature under atmospheric pressure. Since each redox state of this polymer is associated with a specific electronic structure, an oxidized PANI thin film undergoes a color change that can be detected in a sensitive optochemical sensor. But the strongly absorbed NO2 molecules cannot be removed at room temperature from the polymer material during the purging process with a dried N2 gas flux. We report in this work that a heating element can be integrated into the optochemical sensor to elevate the sensing sample temperature during the desorption process. At temperatures higher than 50◦C, the optical signal of the NO2 absorbed PANI samples starts to return to its original value during the purging process, suggesting the desorption of the NO2 species from the PANI samples. The higher the heating temperature, the greater the activation energy for desorption, and consequently the faster the desorption speed. Similar results are also obtained for the NH3 desorption process occurring in the same polymer.
Tema
Polyaniline thin films; NO2 desorption process; activation energy for desorption; optochemical sensors
Idioma
eng
ISSN
2683-2224 (digital); 0035-001X (impresa)

Enlaces