Color changeable hydrogen detection sensor based on molybdenum oxide and method of manufacturing the same
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.
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,
the molybdenum oxide (MoO 3 )—Pd nanocomposite comprises the molybdenum oxide nanostructure and the palladium catalyst particles at a weight ratio of about 100:0.5 to 100:10.
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 vehicle comprising a hydrogen detection sensor of claim 1 .
7. A method of manufacturing a hydrogen detection sensor-, comprising the steps of:
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,
wherein the MoO 3 —Pd nanocomposite comprises the molybdenum oxide nanostructure and the palladium catalyst particles at a weight ratio of about 100:05 to 100:10.
8. The method of claim 7 , wherein step of forming the molybdenum oxide nanostructure comprises:
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.
9. The method of claim 8 , wherein the molybdenum oxide nanostructure is formed at a temperature of about 140 to 180° C. for about 2 to 6 hours.
10. The method of claim 8 , wherein the molybdenum oxide nanostructure is heat-treated at a temperature of about 400 to 600° C. for about 1 to 3 hours.
11. The method of claim 7 , wherein the polymer is polyvinylpyrrolidone, polyvinyl alcohol, or a mixture thereof.