Abstract
Abstract This work presents the results obtained in the production of poly (vinyl alcohol) (PVA) nanofibers with different concentrations of polypyrrole (PPy) doped with dodecylbenzene sulfonic acid (DBSA) - PPy.DBSA. The morphology of the nanofibers was studied by scanning electron microscopy (SEM) technique. The nanofibers were deposited on interdigitated electrodes (IDEs) for direct current electrical characterization (DC) and tested as ammonia gas sensors. The results showed a rapid detection of ammonia gas for higher concentrations of PPy.DBSA and for several alternating cycles in atmospheric N2.
Highlights
There is a wide range of sensors used in security area for the detection of toxic chemicals and gases[1]
The substrates were produced at Laboratório de Microfabricação e Filmes Finos (LMF) and Laboratório Nacional de Nanotecnologia (LNNano) in Centro Nacional de Pesquisa em Energia e Materiais (CNPEM)
It is of great importance that the relative humidity of the environment is less than 60% for the production of PVA nanofibers
Summary
There is a wide range of sensors used in security area for the detection of toxic chemicals and gases[1]. In addition to the materials used, the manufacturing method influences the performance of the sensors, in this sense, the electrospinning technique can significantly contribute to improve the performance of such devices, as they have a high surface area up to 103 times, which is greater when compared to microfibers and thin films4,and may present porous structure and electrical conductivity[5,6,7,8,9]. The electrospinning technique is apparently a simple technique, the difficulty lies in producing fibers for some types of materials, being necessary to choose materials that meet the minimum requirements for using the technique Such parameters are: i) solution: viscosity, surface tension and conductivity; ii) process: applied electrical voltage, flow rate,. It was found that both the presence of PPy and the quality of the fibers obtained influence the quality of the sensor
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