Organic electronics is proving to be a suitable technology for the fabrication of electronic devices on conformable, flexible and transparent substrates, presently relying on plastic substrates. In this context, the growing production volume of flexible electronic devices and the very slow degradation of plastics is expecting to lead the near future on the use of more environmental substrates which should be bio-based and biodegradable. Cellulose-based green electronics is a novel platform with unique virtues including easy recycling/disposal and cost efficiency. Derived from abundant and renewable raw materials, and thanks to their outstanding physico-chemical and mechanical properties, cellulose nanofibers (CNFs) are rapidly emerging as one of the most promising future components for the production of sustainable, biodegradable, and eco-friendly electronics. Their combination with conductive polymers to obtain conductive nanopapers allows moving their functionality from substrates to active components of the device. In this work, a route for the inkjet-printing of organic diodes is outlined. The proposed strategy is based on the use of conductive nanopapers as both substrates and bottom electrodes onto which insulator and organic semiconducting layers are deposited to fabricate novel diode structures. A leaky dielectric between the electrode and the semiconductor is responsible for the creation of an energy barrier that allows the current to flow just in one direction and gives the asymmetric current-voltage characteristic typical of a diode. Different combinations of CNPs and insulating polymers have been tested. Rectification ratios of up to 1.2*103 at |3 V| and a current density up to approximately 6.5 µAcm-2 were recorded. Finally, an NO2 gas sensor based on the diode is presented as a proof-of-concept of the potentiality of our approach for versatile, low-temperature, and disposable sensing applications.

Organic inkjet-printed devices on conductive nanopaper

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.