| Texto completo | |
| Autor(es): |
Andre, Rafaela S.
;
Shimizu, Flavio M.
;
Miyazaki, Celina M.
;
Riul, Jr., Antonio
;
Manzani, Danilo
;
Ribeiro, Sidney J. L.
;
Oliveira, Jr., Osvaldo N.
;
Mattoso, Luiz H. C.
;
Correa, Daniel S.
Número total de Autores: 9
|
| Tipo de documento: | Artigo Científico |
| Fonte: | SENSORS AND ACTUATORS B-CHEMICAL; v. 238, p. 795-801, FEB 2017. |
| Citações Web of Science: | 32 |
| Resumo | |
Reliable gas sensors operating at room temperature are in demand for monitoring the environment for hazardous pollutants, such as ammonia (NH3) gas that may become toxic to humans and animals above a threshold concentration. In this paper we report on the combination of three materials, namely polyaniline (PANI), graphene oxide (GO) and zinc oxide (ZnO), to produce hybrid layer-by-layer (LbL) films used for sensing NH3 with impedance spectroscopy measurements. The deposition of tetralayered PANI/GO/PANI/ZnO LbL films was confirmed with UV-vis. absorption and Raman spectroscopies, while atomic force microscopy (AFM) served to investigate film morphology. Exposure of these LbL films to NH3 caused film roughness to vary, in an effect that depended on the number of tetralayers. Because of synergy in the materials properties, the films with 3 tetralayers were found to be the most adequate for detecting NH3 in the range from 25 ppm to 500 ppm with a response time of 30 s. These figures of merit are adequate for monitoring working environments regarding gas exposure, and highlight the usefulness of the control of film architecture provided by the LbL technique. (C) 2016 Elsevier B.V. All rights reserved. (AU) | |
| Processo FAPESP: | 14/16789-5 - Materiais nanoestruturados híbridos baseados em polímeros conjugados e partículas metálicas aplicados em sensores |
| Beneficiário: | Daniel Souza Corrêa |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 13/14262-7 - Filmes nanoestruturados de materiais de interesse biológico |
| Beneficiário: | Osvaldo Novais de Oliveira Junior |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 12/23880-3 - Desenvolvimento de sensores poliméricos nanoestruturados como plataforma de diagnóstico de bactérias causadoras de mastite bovina |
| Beneficiário: | Luiza Amim Mercante |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 12/15543-7 - Biossensores para detectar Escherichia coli usando o conceito de línguas eletrônicas |
| Beneficiário: | FLAVIO MAKOTO SHIMIZU |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |