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

SENSORS AND ACTUATORS B-CHEMICAL

卷:238

Article

Andre, Rafaela S.^1,2  Shimizu, Flavio M.^1,3  Miyazaki, Celina M.⁴  Riul, Antonio, Jr.⁵  Manzani, Danilo⁶  Ribeiro, Sidney J. L.⁶  Oliveira, Osvaldo N., Jr.³  Mattoso, Luiz H. C.^1,2  Correa, Daniel S.^1,2 

[1] Embrapa Instrumentat, Natl Lab Nanotechnol Agribusiness LNNA, BR-13560970 Sao Carlos, SP, Brazil

[2] Fed Univ Sao Carlos UFSCar, Dept Chem, Ctr Exact Sci & Technol, BR-13565905 Sao Carlos, SP, Brazil

[3] Univ Sao Paulo, Sao Carlos Inst Phys IFSC, POB 369, BR-13566590 Sao Carlos, SP, Brazil

[4] Fed Univ Sao Carlos UFSCar, CCTS, Sorocaba, SP, Brazil

[5] Univ Estadual Campinas, Inst Phys Gleb Wataghin, BR-13083859 Campinas, SP, Brazil

[6] Sao Paulo State Univ UNESP, Dept Chem, BR-14801970 Araraquara, SP, Brazil

关键词: Ammonia sensor;    Graphene oxide;    Polyaniline;    Impedance spectroscopy;    Nanostructured film;   

DOI  :  10.1016/j.snb.2016.07.099

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free