| Full text | |
| Author(s): |
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.
Total Authors: 9
|
| Document type: | Journal article |
| Source: | SENSORS AND ACTUATORS B-CHEMICAL; v. 238, p. 795-801, FEB 2017. |
| Web of Science Citations: | 32 |
| Abstract | |
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) | |
| FAPESP's process: | 14/16789-5 - Hybrid nanostructured materials based on conjugated polymers and metallic nanoparticles for sensor applications |
| Grantee: | Daniel Souza Corrêa |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 13/14262-7 - Nanostructured films from biologically-relevant materials |
| Grantee: | Osvaldo Novais de Oliveira Junior |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 12/23880-3 - Development of polymeric nanostructures as a sensor platform for diagnosis of bacteria causing mastitis |
| Grantee: | Luiza Amim Mercante |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 12/15543-7 - Biosensors to detect Escherichia coli using the concept of an extended electronic tongue |
| Grantee: | FLAVIO MAKOTO SHIMIZU |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |