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Environmentally Friendly Graphene‐Based Conductive Inks for Multitouch Capacitive Sensing Surfaces
Author(s) -
Franco Miguel,
Correia Vitor,
Marques Pedro,
Sousa Fábio,
Silva Rui,
Figueiredo Bruno R.,
Bernardes Adriana,
Silva Rui P.,
LancerosMendez Senentxu,
Costa Pedro
Publication year - 2021
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202100578
Subject(s) - touchscreen , materials science , inkwell , electrical conductor , capacitive sensing , graphene , printed electronics , screen printing , conductive ink , nanotechnology , optoelectronics , context (archaeology) , computer science , layer (electronics) , composite material , sheet resistance , computer hardware , paleontology , biology , operating system
Conductive graphene‐based inks can be tailored for functional applications and, in particular, for printed electronics. Transparent, flexible, and easy printable materials are nowadays increasingly required for sensing applications. In this context, a capacitive multitouch sensing surface is developed using conductive graphene nanoparticles‐based ink with carboxymethyl cellulose as a binder. The rheological properties of the ink are tailored to be printed by the screen‐printing technique. The touchscreen is based on printed conductive lines and columns and thus the characteristics of the printed lines are optimized based on the line width and number of printing steps. The optimal printed conditions are 0.5 mm of width and five printing steps, leading to electrical resistance of 2.4 kΩ. The screen‐printed flexible touchscreen is composed of 40 columns × 28 rows. An electric circuit and a graphic interface are also developed leading to an 8” touchscreen with multitouch capabilities and fast signal processing.