Gas sensor

Patent metadata

Field	Value
Publication number	US-12474286-B2
Application number	US-202118014238-A
Country	US
Kind code	B2
Filing date	Jul 2, 2021
Priority date	Jul 3, 2020
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

The present invention refers to a gas sensor comprising a hybrid material of perovskite and graphene, to the method for obtaining said sensor and to the gas detection method using said sensor.

First claim

The invention claimed is:

1 . Gas sensor comprising:
a hybrid material comprising formula ABX 3 metal halide perovskite nanocrystals, and graphene deposited on a substrate with electrodes where the perovskite nanocrystals are embedded in the graphene.

2 . Gas sensor according to claim 1 , where the graphene has less than 10% of oxygen functional groups.

3 . Gas sensor according to claim 1 , where A in the formula ABX 3 is a cation selected from: methylammonium, formamidinium and cesium.

4 . Sensor according to claim 1 , where the perovskite nanocrystals are comprised between 6 and 8 nanometers in size.

5 . Sensor according to claim 1 , the substrate of which is made of alumina.

6 . Sensor according to claim 1 , where A in the formula ABX 3 is methylammonium and X is bromine.

7 . Sensor according to claim 1 , where the gas to be detected is benzene and toluene, and A in the formula ABX 3 is methylammonium.

8 . Sensor according to claim 1 , where the gas to be detected is NO 2 , and A in the formula ABX 3 is formamidinium.

9 . Sensor according to claim 1 where the gas to be detected is NH 3 , A in the formula ABX 3 of the perovskite is methylammonium and X is a chlorine anion.

10 . Gas sensor according to claim 1 , where the halide of the perovskite is selected from chlorine and/or bromine and/or iodine.

11 . Method for obtaining a sensor defined according to claim 1 comprising the following steps:
a) preparing a graphene dispersion;
b) exfoliating the graphene from the previous dispersion;
c) adding and mixing the perovskite nanocrystals to the exfoliated graphene solution to obtain a hybrid material of graphene and perovskite;
d) depositing the hybrid material of graphene and perovskite on a substrate containing electrodes.

12 . Method according to claim 11 , where the solvent of the solution in step a) is toluene or hexane and the graphene consists of sheets of graphene.

13 . Method according to claim 11 , the graphene is exfoliated in step b) by pulsed sonication.

14 . Method according to claim 11 , where in step d) the substrate is alumina containing screen-printed platinum interdigitated electrodes.

15 . Gas detection method comprising the stages of:
a) placing the sensor defined in claim 1 in a chamber through which the gas flow passes, b) measuring the variation of the resistance after the passage of gas.

16 . Method according to claim 15 , characterized in that stage b) is carried out at room temperature.

Assignees

• Univ Rovira I Virgili
• Univ Valencia Politecnica
• Consejo Superior Investigacion

Inventors

• Casanova Cháfer Juan
• Llobet Valero Eduard
• García Aboal Rocío
• Atienzar Corvillo Pedro

Classifications

• C01P2002/34

  perovskite-type (ABO3) · CPC title

• C01B32/182

  Graphene · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• H10K85/50

  Organic perovskites; Hybrid organic-inorganic perovskites [HOIP], e.g. CH3NH3PbI3 · CPC title

• G01N33/0047

  Organic compounds · CPC title