title: Screen-printed resistive pressure sensors containing graphene nanoplatelets and carbon nanotubes.
abstract: Polymer composites with nanomaterials such as graphene nanoplatelets and carbon nanotubes are a new group of materials with high application possibilities in printed and flexible electronics. In this study such carbon nanomaterials were used as a conductive phase in polymer composites. Pastes with dispersed nanomaterials in PMMA and PVDF vehicles were screen printed on flexible substrates, and used as an active layer in pressure sensors, exploiting contact resistance phenomena. The relationship between resistance and pressure is nearly linear on a logarithmic scale for selected types of samples, and their response is several times higher than for similar sensors with graphite layers. The use of surfactants allowed us to fabricate evenly dispersed nanomaterials with different amount of nanoplatelets and nanotubes in the composites. The samples contained from 1.25 wt.% to 2 wt.% of graphene and 1 wt.% to 0.5 wt.% of nanotubes and exhibited diverse sheet resistivity. Experiments revealed the relationship between morphology and loading of functional phase in the polymer matrix and the sensors' sensitivity.
authors.affiliation: Institute of Metrology and Bioengineering, Faculty of Mechatronics, Warsaw University of Technology, A. Boboli 8 St., 02-525 Warsaw, Poland. dan.janczak@gmail.com.
authors.forename: Daniel
authors.initials: D
authors.lastname: Janczak
authors.affiliation: Institute of Metrology and Bioengineering, Faculty of Mechatronics, Warsaw University of Technology, A. Boboli 8 St., 02-525 Warsaw, Poland. amlozniak@poczta.onet.pl.
authors.forename: Marcin
authors.initials: M
authors.lastname: Słoma
authors.affiliation: Institute of Metrology and Bioengineering, Faculty of Mechatronics, Warsaw University of Technology, A. Boboli 8 St., 02-525 Warsaw, Poland. g.wroblewski@mchtr.pw.edu.pl.
authors.forename: Grzegorz
authors.initials: G
authors.lastname: Wróblewski
authors.affiliation: Institute of Electronic Materials Technology, Wolczynska 133 St., 01-919 Warsaw, Poland. amlozniak@poczta.onet.pl.
authors.forename: Anna
authors.initials: A
authors.lastname: Młożniak
authors.affiliation: Institute of Metrology and Bioengineering, Faculty of Mechatronics, Warsaw University of Technology, A. Boboli 8 St., 02-525 Warsaw, Poland. amlozniak@poczta.onet.pl.
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Jakubowska