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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Hybrid layer-by-layer (LbL) films of polyaniline, graphene oxide and zinc oxide to detect ammonia

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: 13/14262-7 - Nanostructured films from biologically-relevant materials
Grantee:Osvaldo Novais de Oliveira Junior
Support type: 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 type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 12/15543-7 - Biosensors to detect Escherichia coli using the concept of an extended electronic tongue
Grantee:Flavio Makoto Shimizu
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 14/16789-5 - Hybrid nanostructured materials based on conjugated polymers and metallic nanoparticles for sensor applications
Grantee:Daniel Souza Corrêa
Support type: Regular Research Grants