US 9,068,283 B2 · Strain sensors, methods of making same, and applications of same

Abstract

In one aspect, the present invention relates to a layered structure usable in a strain sensor. In one embodiment, the layered structure has a substrate with a first surface and an opposite, second surface defining a body portion therebetween; and a film of carbon nanotubes deposited on the first surface of the substrate, wherein the film of carbon nanotubes is conductive and characterized with an electrical resistance. In one embodiment, the carbon nanotubes are aligned in a preferential direction. In one embodiment, the carbon nanotubes are formed in a yarn such that any mechanical stress increases their electrical response. In one embodiment, the carbon nanotubes are incorporated into a polymeric scaffold that is attached to the surface of the substrate. In one embodiment, the surfaces of the carbon nanotubes are functionalized such that its electrical conductivity is increased.

Claims22

Dependent claims

A layered structure usable in a strain sensor, comprising:

a substrate with a first surface and an opposite, second surface defining a body portion therebetween;
a film of carbon nanotubes deposited on the first surface of the substrate, wherein the film of carbon nanotubes is electrically conductive and characterized with an electrical resistance;
and
a flexible polymeric film placed between the film of carbon nanotubes and the substrate,
wherein the mechanical properties of the flexible polymeric film match that of the substrate;
wherein the substrate is insulative, and comprises a carbon composite material having a substantial amount of non-carbon elements, to allow material compatibility between the carbon-based substrate and the film of carbon nanotubes;
and
wherein the carbon nanotubes are randomly directed in the film, such that the resistance can be monitored independent of direction.

5 more elements

A strain sensor, comprising:

a substrate with a first surface and an opposite, second surface defining a body portion therebetween;
a film of carbon nanotubes deposited on the first surface of the substrate, wherein the film of carbon nanotubes is electrically conductive and characterized with an electrical resistance that is changeable in response to a change in an environment surrounding the film of carbon nanotubes;
and
a flexible polymeric film placed between the film of carbon nanotubes and the substrate,
wherein the mechanical properties of the flexible polymeric film match that of the substrate;
wherein the substrate is insulative, and comprises a carbon composite material having a substantial amount of non-carbon elements, to allow material compatibility between the carbon-based substrate and the film of carbon nanotubes;
and
wherein the carbon nanotubes are randomly directed in the film, such that the resistance can be monitored independent of direction.

5 more elements

Dependencies are inferred from the claim text.

Strain sensors, methods of making same, and applications of same

Life of this patent

Strain sensors, methods of making same, and applications of same

Life of this patent

Abstract

Claims22