Sensing material for detecting hydrogen sulfide, hydrogen sulfide-sensitive layer, and metal oxide semiconductor-type gas sensor

Patent metadata

Field	Value
Publication number	US-2022324721-A1
Application number	US-202217678086-A
Country	US
Kind code	A1
Filing date	Feb 23, 2022
Priority date	Mar 31, 2021
Publication date	Oct 13, 2022
Grant date	—

Abstract

A sensing material for detecting hydrogen sulfide capable of detecting hydrogen sulfide even having a low concentration, a hydrogen sulfide-sensitive layer containing the sensing material for detecting hydrogen sulfide, and a metal oxide semiconductor-type gas sensor having the hydrogen sulfide-sensitive layer are provided. The sensing material for detecting hydrogen sulfide includes CuFe 2 O 4 -type complex oxide (W). The CuFe 2 O 4 -type complex oxide (W) contains, as a main component (W1), 35.0 to 49.5 mol % of iron oxide in terms of Fe 2 O 3 and 50.5 to 65 mol % of copper oxide in terms of CuO, and an average particle diameter of particles is 3 μm or less.

First claim

What is claimed is:

1 . A sensing material for detecting hydrogen sulfide, which comprises CuFe 2 O 4 -type complex oxide (W),
wherein the CuFe 2 O 4 -type complex oxide (W) comprises, as a main component (W1), 35.0 to 49.5 mol % of iron oxide in terms of Fe 2 O 3 and 50.5 to 65 mol % of copper oxide in terms of CuO, and an average particle diameter of particles of the sensing material for detecting hydrogen sulfide is 3 μm or less.

2 . The sensing material for detecting hydrogen sulfide according to claim 1 ,
wherein the CuFe 2 O 4 -type complex oxide (W) further comprises, as a sub-component (W2), at least one selected from the group consisting of titanium oxide, tin oxide, and tricobalt tetroxide, and a total content of the sub-component (W2) is 20 mass % or less in terms of TiO 2 , SnO 2 , and CoO.

3 . The sensing material for detecting hydrogen sulfide according to claim 1 ,
wherein the sensing material for detecting hydrogen sulfide further comprises one or more supported metals (M) selected from palladium, gold, silver, and platinum, the CuFe 2 O 4 -type complex oxide (W) supports the supported metal (M), and a total content of the supported metal (M) is 0.1 mass % or more and 25 mass % or less with respect to 100 mass % of the sensing material for detecting hydrogen sulfide.

4 . The sensing material for detecting hydrogen sulfide according to claim 1 ,
wherein, when an average atomic ratio of Fe per particle in the sensing material for detecting hydrogen sulfide is set to X1 and an average atomic ratio of Cu is set to X2, and X1/X2=α, the CV value of α is 30.0% or less.

5 . A hydrogen sulfide-sensitive layer, which is made of the sensing material for detecting hydrogen sulfide according to claim 1 .

6 . A metal oxide semiconductor-type gas sensor, comprising:
a substrate; an electrode formed on the substrate; and the hydrogen sulfide-sensitive layer according to claim 5 , which is formed on a surface of the substrate on which the electrode is formed.

Assignees

• Tdk Corp

Inventors

• Ishikura Tomokazu
• Masaoka Raitaro

Classifications

• G01N33/0044 Primary

  Sulphides, e.g. H2S · CPC title

• C01G49/0018 Primary

  Mixed oxides or hydroxides, (C01G49/0009 takes precedence) · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• G01N27/125

  Composition of the body, e.g. the composition of its sensitive layer · CPC title