Cobalt sulfide/reduced graphite oxide composite and application thereof in gas sensors

Patent metadata

Field	Value
Publication number	US-12534384-B2
Application number	US-202218037559-A
Country	US
Kind code	B2
Filing date	Jun 29, 2022
Priority date	Apr 7, 2022
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

A method for preparing a cobalt sulfide/reduced graphite oxide composite includes: preparing a glycerol-cobalt precursor by taking a water-soluble cobalt salt, a micromolecular alcohol solvent, and glycerol as raw materials; mixing the glycerol-cobalt precursor with an alkali liquor to prepare a Co(OH) 2 nanoflower; calcining the Co(OH) 2 nanoflower to obtain a Co 3 O 4 nanoflower; subjecting the Co 3 O 4 nanoflower to a reaction with a water-soluble sulfur salt to obtain a COS nanoflower, and mixing the COS nanoflower with graphite oxide and carrying out a heat treatment to obtain the composite. The response characteristics of a gas sensor to NO 2 gas are studied at room temperature, and the graphite is complexed with a transition metal sulfide with unique morphology to construct a unique heterostructure. While expanding the specific surface area to increase the number of adsorption sites, the heterostructure of a contact surface is used to greatly enhance the charge-transfer efficiency.

First claim

The invention claimed is:

1 . A method for preparing a cobalt sulfide/reduced graphite oxide composite, comprising:
mixing a water-soluble cobalt salt, a small molecule alcohol solvent, and glycerin to prepare a glycerol cobalt precursor; mixing the glycerol cobalt precursor with an alkaline solution to prepare Co(OH) 2 nanoflowers; calcining the Co(OH) 2 nanoflowers to obtain Co 3 O 4 nanoflowers; reacting the Co 3 O 4 nanoflowers with a water-soluble sulfur salt to obtain CoS nanoflowers; adding the CoS nanoflowers to ethanol to obtain a CoS nanoflower dispersion; mixing the CoS nanoflower dispersion with a graphite oxide dispersion; conducting a centrifugation treatment to obtain a precipitate; and heating the precipitate at 150-250° C. for 60-120 minutes to obtain the cobalt sulfide/reduced graphite oxide composite, wherein the cobalt sulfide/reduced graphite oxide composite comprises the CoS nanoflowers and a graphite covered on the CoS nanoflowers; and wherein the graphite is a reduced graphite oxide.

2 . The method for preparing the cobalt sulfide/reduced graphite oxide composite according claim 1 , wherein a mass ratio of the CoS nanoflowers to the graphite oxide is 0.2-20:1.

3 . The method for preparing the cobalt sulfide/reduced graphite oxide composite according to claim 2 , wherein the mass ratio of the CoS nanoflowers to the graphite oxide is 2-10:1.

Assignees

• Univ Soochow

Inventors

• Wang Yanyan

Classifications

• C01P2004/80

  Particles consisting of a mixture of two or more inorganic phases · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• H01B1/10

  sulfides · CPC title

• G01N27/30

  Electrodes, e.g. test electrodes; Half-cells (G01N27/414 takes precedence) · CPC title

• C01G51/04

  Oxides · CPC title