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    Nanochitin-based composite films as a disposable ethanol sensor

    Year: 2020

    Journal: J. Environ. Chem. Eng., Volume 8, OCT

    Authors: Andre, Rafaela S.; dos Santos, Danilo M.; Mercante, Luiza A.; Facure, Murilo H. M.; Campana-Filho, Sergio P.; Mattoso, Luiz H. C.; Correa, Daniel S.

    Organizations: Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2016/23793-4, 2017/20973-4, 2017/10582-8, 2017/12174-4]; Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ) [304109/2017-7, 303.796/2014-6]; MCTI-SisNano [CNPq/402.287/2013-4]; Rede Agronano (EMBRAPA) from Brazil

    Keywords: Chitin whiskers; Zinc oxide nanoparticles; Polyaniline; Nanocomposite; Disposable ethanol sensor

    Miniaturized and inexpensive sensing platforms remains an important goal for the field-deployable monitoring of toxic gases. In this work, we report a disposable ethanol sensor based on nanochitin-composite containing chitin nanowhiskers/zinc oxide nanoparticles/polyaniline (ChitNW-ZnO/PANI) produced via solution casting method. The as-prepared material was fully characterized by transmission electron microscopy, atomic force microscopy, contact angle measurements, mechanical tests, thermogravimetric analysis and X-ray diffraction, confirming its successful preparation and revealing its morphology, microstructure and composition. Such nanocomposite showed enhanced ethanol sensing performance at room temperature, in which quantitative analysis was obtained in the range 20-100 ppm with a detection limit of 17 ppm (S/N = 3). We further validated that common potential interfering agents were not misidentified with ethanol. The development of such a unique nanochitin-based composite as a disposable sensor is a great step ahead in flexible and wearable electronics having potential applications in different fields such as biomedical and biotechnological engineering, security and internet of things (IoT).
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