Sensitive electromechanical sensors using viscoelastic graphene-polymer nanocomposites.
Science
; 354(6317): 1257-1260, 2016 12 09.
Article
em En
| MEDLINE
| ID: mdl-27940866
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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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Determinação da Pressão Arterial
/
Elasticidade
/
Nanocompostos
/
Determinação da Frequência Cardíaca
/
Grafite
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
Limite:
Animals
/
Humans
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article