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Iontronics with cork
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This work reports an unprecedented functionalization of one of the most unique
natural materials on Earth, cork, in the field of electronics. Motivated by the excessive
waste of the cork industry and resorting to other natural and abundant materials in nature,
it was possible to successfully develop electrolytes based on cork.
In a primary approach, there are several steps considered and constantly
reevaluated in order to produce the first functional cork-based electrolyte. An aqueous
lithium salts and urea solvent system is essential, as well as a natural binding agent, herein
a cellulose derivative, and an acid neutralization. Secondly, these novel cork-based
electrolytes are put to the test as the gate dielectric on EGTs with a cellulose based
semiconducting ink, and their electrical performance is studied. The cork-based
electrolytes show interesting properties for applications such as supercapacitors,
electronic wearables or electrochromic displays due to their electrical double-layer
capacitance (CDL) values of more than 8 μF cm−2 and ionic conductivity in the order of
10−4 S cm−1.
Carboxymethyl cellulose and zinc oxide EGTs on cork composite substrates with
the functional cork material as the gate dielectric exhibit low working voltage (<2 V),
Ion/Ioff ratios of 103, a subthreshold swing (SS) lower than 0.3 Vdec−1, low saturation
mobilities (SAT) at 0.4 cm2V−1s−1 and transconductance (gm) of 10−6 S. The flexible corkbased
electrolyte-gated transistors on paper are also demonstrated, operating at low
voltage (Von <1V) and exhibiting transconductance (gm) values of 10−4 S and saturation
mobilities (SAT) higher than 10 cm2V−1s−1.
Descrição
Palavras-chave
Cork cork electronics cellulose paper electronics electrolytes electrolytegated transistors