A strain sensor includes a flexible substrate, a CNT film made of a plurality of CNT fibers aligned in an orientation direction, a pair of electrodes, and a protective coat. The electrodes are formed at the opposite ends of the CNT film in a perpendicular direction to the orientation direction of the CNT fibers. The protective coat protecting the CNT film is made of a resin, a water-based emulsion, or an oil-based emulsion. The protective coat is placed in contact with at least part of the CTN fibers on the surface of the CNT film. The strain sensor including the protective coat is able to prevent damage/breakage of the CNT film and to prevent foreign matters from entering into gaps between CNT fibers, thus improving durability in maintaining adequate sensing functionality.

Claims

12 · 1 independent · depth 3

12 granted claims

›1.independentA strain sensor comprising:na substrate which is flexible along a first axis;a CNT film which is made of a plurality of CNT fibers aligned in an orien…+11

›2.↳ 1The strain sensor according to claim 1, wherein the protective coat is laminated on the surface of the CNT film.d2

›3.↳ 1The strain sensor according to claim 1, wherein the protective coat includes a plurality of conductive additives.d2

›4.↳ 1The strain sensor according to claim 1, wherein the CNT film includes at least one cleavable part which is cleavable in the orientation direction of t…d2

›5.↳ 1The strain sensor according to claim 1, wherein each of the CNT fibers is made of a plurality of CNT monofilaments which are elongated in a longitudin…d2+1

›7.↳ 1The strain sensor according to claim 1, wherein the protective coat is formed by applying hydrophilic latex to the surface of the CNT film.d2

›8.↳ 1The strain sensor according to claim 1, wherein the protective coat includes a plurality of resin particles insoluble in a hydrophobic organic solvent…d2

›9.↳ 1The strain sensor according to claim 1, wherein the protective coat is made of oil-based emulsion including a hydrophobic organic solvent as a dispers…d2+1

›11.↳ 1The strain sensor according to claim 1 wherein the axis is perpendicular to the orientation direction of the CNT fibers.d2

›12.↳ 1The strain sensor according to claim 1, wherein the protective coat with a thickness ranging from 10 μm to 3 mm is formed on the CNT file with a thick…d2

Classifications

1 codes

IPC · International Patent Classification

Section G — Physics

G01B7/16

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Pendency

3.0 y

1,096 days filing → grant

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non-final + final

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1 RCE

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Philip Cotey

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Type	Document	Date
related publication	US 20130118267 A1	16 May 2013

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