# US 11,029,271 B2 · Ammonia gas detecting sensor using graphene doped with copper oxide nanopaticles and ammonia gas detecting device comprising the same

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- Number: US 11,029,271 B2
- Document ID: US11029271B2
- Status: Granted
- Kind: B2
- Application number: 16/255,433
- Filed: 2019-01-23
- Published: 2020-04-23
- Granted: 2021-06-08
- Earliest claimed: 2018-10-19
- Assignees: Korea Institute of Science and Technology
- Applicants: Korea Institute of Science and Technology
- Inventors: Kang Bong Lee; Yun Sik Nam; Yeon Hee Lee; Oleksandr Tsymbalenko
- Web page: https://patentgrep.com/patent/US11029271B2

## CPC

- G01N 27/127: {comprising nanoparticles}
- G01N 33/0054: {Ammonia}
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE

## Abstract

The present disclosure relates to an ammonia gas detection sensor including a substrate, a graphene sheet disposed on the substrate, and metal nanoparticles disposed on the graphene sheet, and an ammonia gas detection device comprising the gas detection sensor.

## Claims

### Claim 1

An ammonia gas detection sensor, comprising:
a substrate;
a graphene sheet disposed on the substrate; and
metal nanoparticles disposed on the graphene sheet;
wherein the graphene sheet is a monolayer; and
wherein the metal nanoparticles include copper oxide (I) (CuO) nanoparticles having a size of 10 nm to 20 nm;
wherein the CuO nanoparticles are formed by doping a mixed solution including CuO nanoparticles onto the graphene sheet; and
wherein the mixed solution includes 1 wt % to 2 wt % of the CuO nanoparticles based on the total weight.

### Claim 2 (depends on 1)

The ammonia gas detection sensor according to claim 1, wherein the ammonia gas is a gaseous ammonia gas.

### Claim 3 (depends on 1)

The ammonia gas detection sensor according to claim 1, wherein the graphene sheet is deposited on the substrate by a chemical vapor deposition method.

### Claim 4 (depends on 1)

The ammonia gas detection sensor according to claim 1, wherein the doping includes dipping the graphene sheet in the mixed solution and stirring the mixed solution by rotation at 1000 rpm to 2000 rpm.

### Claim 5 (depends on 1)

An ammonia gas detection device, comprising:
the ammonia gas detection sensor according to claim 1;
electrodes connected to two ends of the graphene sheet; and
a power supply unit which operates the ammonia gas detection sensor.

### Claim 6 (depends on 1)

The ammonia gas detection sensor according to claim 1, wherein the mixed solution is aqueous.