Color changeable hydrogen detection sensor based on molybdenum oxide and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2017191970-A1
Application number	US-201615277067-A
Country	US
Kind code	A1
Filing date	Sep 27, 2016
Priority date	Dec 30, 2015
Publication date	Jul 6, 2017
Grant date	—

Abstract

Disclosed are a hydrogen detection sensor and a method of manufacturing the same. The hydrogen detection sensor is manufactured by using hydrothermal synthesis method to synthesize a molybdenum oxide (MoO 3 ) nanostructure, and irradiating UV light thereon to form an MoO 3 —Pd nanocomposite comprising the molybdenum oxide nanostructure with palladium (Pd) catalyst particles, and coating the MoO 3 —Pd nanocomposite on a substrate. As such, a visible color change from the MoO 3 before and after exposure to hydrogen may be so obvious that the sensing or sensitivity of hydrogen and the long-term stability may be substantially improved. In addition, the manufacturing process is simple, and the manufacturing costs may be reduced.

First claim

What is claimed is:

1 . A hydrogen detection sensor, comprising:
a substrate; and a coating layer formed on a surface of the substrate and discolored when exposed to hydrogen, wherein the coating layer comprises a molybdenum oxide (MoO 3 )—Pd nanocomposite in which palladium (Pd) catalyst particles are adsorbed on an molybdenum oxide (MoO 3 ) nanostructure.

2 . The hydrogen detection sensor of claim 1 , wherein the substrate is selected from the group consisting of a paper filter, a glass substrate, a polymer film, ink, pigment, and paint.

3 . The hydrogen detection sensor of claim 1 , wherein the molybdenum oxide (MoO 3 ) nanostructure has a length of about 1 to 100 μm and a diameter of about 20 to 100 nm.

4 . The hydrogen detection sensor of claim 1 , wherein the palladium (Pd) catalyst particles have an average particle diameter of about 3 to 15 nm.

5 . The hydrogen detection sensor of claim 1 , wherein the coating layer has a coating thickness of about 0.1 to 200 μm.

6 . A method of manufacturing a hydrogen detection sensor, comprising:
providing a substrate; forming a molybdenum oxide nanostructure; preparing a palladium catalyst solution by mixing a polymer with a palladium precursor solution; forming an MoO 3 —Pd nanocomposite by mixing the molybdenum oxide nanostructure with the palladium catalyst solution and irradiating UV light to the mixture; and forming a coating layer by coating the MoO 3 —Pd nanocomposite on the substrate.

7 . The method of claim 6 , wherein the molybdenum oxide nanostructure is formed by steps comprising:
preparing an aqueous molybdenum oxide solution by mixing an acid solution with an aqueous molybdenum ammonium solution; forming the molybdenum oxide nanostructure by hydrothermally synthesizing the aqueous molybdenum oxide solution; and heat-treating the molybdenum oxide nanostructure.

8 . The method of claim 7 , wherein the molybdenum oxide nanostructure is formed at a temperature of about 140 to 180° C. for about 2 to 6 hours.

9 . The method of claim 7 , wherein the molybdenum oxide nanostructure is heat-treated at a temperature of about 400 to 600° C. for about 1 to 3 hours.

10 . The method of claim 6 , wherein the polymer is polyvinylpyrrolidone, polyvinyl alcohol, or a mixture thereof.

11 . A vehicle comprising a hydrogen detection sensor of claim 1 .

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Ajou Univ Industry-Academic Coop Found

Inventors

• Noh Yong Gyu
• Bae Ho June
• Seo Hyung Tak
• Kalanur Shankara S
• Lee Yeong An

Classifications

• G01N31/224

  for investigating presence of dangerous gases · CPC title

• G01N31/10

  using catalysis · CPC title

• G01N31/22

  using chemical indicators (G01N31/02 takes precedence) · CPC title

• G01N27/304

  Gas permeable electrodes · CPC title

• G01N21/783

  for analysing gases · CPC title