# US 11,906,364 B2 · Flexible infrared irradiation and temperature sensors

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- Number: US 11,906,364 B2
- Document ID: US11906364B2
- Status: Granted
- Kind: B2
- Application number: 17/368,026
- Filed: 2021-07-06
- Published: 2023-01-12
- Granted: 2024-02-20
- Earliest claimed: 2021-07-06
- Assignees: King Abdulaziz University
- Applicants: King Abdulaziz University
- Inventors: Muhammad Tariq Saeed Chani; Khasan S. Karimov; Abdullah M. Asiri; Tahseen Kamal
- Web page: https://patentgrep.com/patent/US11906364B2

## CPC

- H10K 30/60: in which radiation controls flow of current through the devices, e.g. photoresistors
- G01J 5/0025: {Living bodies (ear thermometers G01J5/0011; detecting, measuring or recording for diagnostic purposes A61B5/00)}
- G01J 5/023: {Particular leg structure or construction or shape; Nanotubes}
- G01J 5/0853: {having infrared absorbers other than the usual absorber layers deposited on infrared detectors like bolometers, wherein the heat propagation between the absorber and the detecting element occurs within a solid}
- G01J 5/22: Electrical features thereof
- H10K 85/221: {Carbon nanotubes}
- H10K 85/311: {Phthalocyanine}
- H10K 77/10: Substrates, e.g. flexible substrates
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)

## Abstract

A flexible infrared irradiation and temperature sensor is provided. The sensor includes a substantially cubic deformable rubber substrate and a conductive layer embedded in the rubber substrate, wherein the conductive layer comprises a middle portion comprising a composite film of carbon nanotubes (CNTs) and nickel phthalocyanine (NiPc); and one or more exterior portions comprising carbon nanotubes, wherein the one or more exterior portions do not include NiPc.

## Claims

### Claim 1

A flexible infrared irradiation and temperature sensor, comprising:
a substantially cubic deformable rubber substrate, wherein the substrate has at least three orthogonal surfaces configured to receive infrared irradiation; and
a conductive layer embedded in the rubber substrate on at least one surface of the substrate, wherein the conductive layer comprises
a middle portion comprising a composite film of carbon nanotubes (CNTs) and nickel phthalocyanine (NiPc); and
one or more exterior portions comprising carbon nanotubes, wherein the one or more exterior portions do not include NiPc,
wherein the surfaces of the substrate not covered with the conductive layer are covered with an opaque dye as an infrared irradiation absorbing layer, and
wherein the rubber substrate is cubic.

### Claim 2 (depends on 1)

The sensor of claim 1, wherein the composite layer has two exterior portions, each containing a metallic wire electrode sewed into the substrate.

### Claim 3 (depends on 1)

The sensor of claim 1, wherein the composite film covers 30-50% of a surface of the substrate.

### Claim 4 (depends on 1)

The sensor of claim 1, wherein each side of the substrate has a size of 8-12 mm.

### Claim 5 (depends on 1)

The sensor of claim 1, wherein the conductive layer has a thickness of 22-28 μm.

### Claim 6 (depends on 1)

The sensor of claim 1, wherein the ratio of CNT to NiPc in the composite film is from 30:70 wt % to 50:50 wt %.

### Claim 7 (depends on 1)

The sensor of claim 1, wherein the sensor is configured to present a linear response when an intensity of infrared irradiation changes.

### Claim 8 (depends on 1)

The sensor of claim 1, wherein an impedance of the sensor depends on a frequency of an applied voltage such that the sensor is configured for demodulation of frequency modulated signal.

### Claim 9 (depends on 1)

The sensor of claim 1, wherein the sensor is configured as a low-pass filter at parallel connection with respect to a load and as a high-pass filter at series connection with respect to a load.