Type

Journal Article

Authors

Jonathan N Coleman
Robert J Young
Matthias E Möbius
Mauro S Ferreira
Zheling Li
Claudia Backes
Andrew Harvey
Romina Charifou
Sebastian Barwich
Gavin Ryan
and 2 others

Subjects

Veterinary

Topics
nanotechnology sensors viscosity nanocomposites silicones blood pressure determination polymer physics nanostructures animals mechanical phenomena graphite elasticity graphene nanoscience materials spiders heart rate determination next generation medical devices humans walking electric impedance instrumentation polymers

Sensitive electromechanical sensors using viscoelastic graphene-polymer nanocomposites. (2016)

Abstract Despite its widespread use in nanocomposites, the effect of embedding graphene in highly viscoelastic polymer matrices is not well understood. We added graphene to a lightly cross-linked polysilicone, often encountered as Silly Putty, changing its electromechanical properties substantially. The resulting nanocomposites display unusual electromechanical behavior, such as postdeformation temporal relaxation of electrical resistance and nonmonotonic changes in resistivity with strain. These phenomena are associated with the mobility of the nanosheets in the low-viscosity polymer matrix. By considering both the connectivity and mobility of the nanosheets, we developed a quantitative model that completely describes the electromechanical properties. These nanocomposites are sensitive electromechanical sensors with gauge factors >500 that can measure pulse, blood pressure, and even the impact associated with the footsteps of a small spider.
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Full list of authors on original publication

Jonathan N Coleman, Robert J Young, Matthias E Möbius, Mauro S Ferreira, Zheling Li, Claudia Backes, Andrew Harvey, Romina Charifou, Sebastian Barwich, Gavin Ryan and 2 others

Experts in our system

1
Jonathan Coleman
Trinity College Dublin
Total Publications: 217
 
2
Matthias E Möbius
Trinity College Dublin
Total Publications: 4
 
3
Mauro Ferreira
Trinity College Dublin
Total Publications: 64
 
4
Claudia Backes
Trinity College Dublin
Total Publications: 20
 
5
Andrew Harvey
Trinity College Dublin
Total Publications: 17
 
6
Sebastian Barwich
Trinity College Dublin
Total Publications: 5