A casein-based biodegradable and sustainable capacitive sensor

The production of electrical and electronic equipment is increasing worldwide with a dramatic increase of electronic waste. Sustainable materials to produce sensors may thus positively impact on the environment. Casein is a milk protein that was used to fabricate a non-cytotoxic and biodegradable ca...

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Published in:Materials chemistry and physics 2024-02, Vol.314, p.128888, Article 128888
Main Authors: De Gregorio, Elena, Miliani, Filippo Manfredi, Vivaldi, Federico Maria, Calisi, Nicola, Poma, Noemi, Tavanti, Arianna, Duce, Celia, Nardella, Federica, Legnaioli, Stefano, Carota, Angela Gilda, Strambini, Lucanos, Biagini, Denise, Lomonaco, Tommaso, Di Francesco, Fabio, Salvo, Pietro
Format: Article
Language:English
Subjects:
Capacitive sensor
Casein
Green electronics
Sustainable electronics
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Summary:The production of electrical and electronic equipment is increasing worldwide with a dramatic increase of electronic waste. Sustainable materials to produce sensors may thus positively impact on the environment. Casein is a milk protein that was used to fabricate a non-cytotoxic and biodegradable capacitive sensor by a green chemical process adding glycerol and trehalose. The casein-based film was characterized by means of thermal (TGA and EGA-MS) and spectroscopic (FTIR-ATR and Dielectric Spectroscopy) techniques. Contact angle, water vapour transmission rate, cytotoxicity and biodegradability were also assessed. A PEDOT:PSS/reduced graphene oxide ink was produced and screen-printed onto the film surface to obtain electrically conductive electrodes. The dielectric properties of the casein-based film allowed for the fabrication of a capacitive sensor that proved sensitive to pH changes. [Display omitted] •Biodegradable and disposable capacitive sensor.•Non-cytotoxic protein-based material.•Novel protein-based dielectric material.•Green fabrication process.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2024.128888