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Chemochromic nanoparticles, method of making the same, and hydrogen sensor including the same

A nanoparticle, chemical color change technology, applied in the field of chemical color change nanoparticles, can solve the problems of reduced reproducibility, hydrogen sensor can not be used as a substitute for existing sensors, etc.

Active Publication Date: 2021-05-11
HYUNDAI MOTOR CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, in the case where the metal catalyst particles are not tightly bonded to the substrate, the lattice of the metal catalyst particles expands when the metal catalyst particles are exposed to hydrogen, but does not return to the initial state when the exposure to hydrogen ceases, so that the reproducibility can be reduced
[0017] As mentioned above, hydrogen sensors according to the related art cannot be used as substitutes for existing sensors in terms of detection capability, sensitivity, safety, fast response time at low concentrations, etc.

Method used

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  • Chemochromic nanoparticles, method of making the same, and hydrogen sensor including the same
  • Chemochromic nanoparticles, method of making the same, and hydrogen sensor including the same
  • Chemochromic nanoparticles, method of making the same, and hydrogen sensor including the same

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Embodiment approach

[0057] In detail, according to an exemplary embodiment of the present invention, there is provided a chemichromic nanoparticle that may have a core-shell structure, such that the chemichromic nanoparticle may include a core including a hydrated or non-hydrated transition metal oxide; and a partially coated A shell comprising a metal catalyst covers the surface of the core. Preferably, the shell may fully or partially coat the surface of the core. For example, the shell can coat about 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, or 99% of the total surface area of ​​the core.

[0058] The transition metal oxide used for the nanoparticle core may be a material whose color changes chemically when the material is exposed to hydrogen gas due to reduction by reaction with hydrogen molecules. Representative examples thereof may include one or two or more selected from SnO 2 、TiO 2 , ZnO, VO 2 、In 2 o 3 , NiO, MoO 3 , SrTiO 3 , Fe 2 o 3 、WO 3 and CuO metal oxides. Pre...

Embodiment

[0107] Experimental method and apparatus

[0108] a. Observe 1% hydrogen in a mixed atmosphere of nitrogen, oxygen and water vapor (at 99% air balance gas (N 2 、H 2 O, O 2 ) in) the color change reaction.

[0109] b. All aerochromic experiments were performed at room temperature, and a flow rate of 2 L / min was maintained on the sample.

preparation example 1

[0110] Preparation Example 1: Preparation of Hydrated Tungsten Oxide

[0111] After preparing a 1 wt % ammonium paratungstate aqueous solution by mixing ammonium paratungstate and water in a reactor, an aqueous tungsten solution was prepared by adding 1.5 ml of hydrochloric acid (HCl) thereto while stirring the aqueous solution, and stirring the mixed solution for another 30 minutes.

[0112] Then, 3 ml of hydrogen peroxide was added to the aqueous tungsten solution, and stirred at room temperature for 60 minutes until the mixed solution became transparent, thereby preparing an aqueous solution of peroxy-polytungstic acid.

[0113] The peroxy-polytungstic acid aqueous solution was injected into the autoclave in which the internal pressure was maintained at 35-50 bar, and it was subjected to the first heat treatment at a temperature of 160° C. for about 1.5 hours.

[0114] After the reaction was terminated, the autoclave was air-cooled to room temperature, and the precipitate...

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Abstract

Disclosed are a chemically variable nanoparticle, a method for manufacturing the nanoparticle, and a hydrogen sensor including the nanoparticle. Specifically, the chemichromic nanoparticles have a core-shell structure such that the chemichromic nanoparticles include a core comprising a hydrated or non-hydrated transition metal oxide; and a shell comprising a transition metal catalyst.

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims priority from Korean Patent Application No. 10-2015-0123830 filed with the Korean Intellectual Property Office on September 1, 2015, which is hereby incorporated by reference in its entirety. [0003] field of invention [0004] The present invention relates to a chemochromic nanoparticle, a method for manufacturing the chemochromic nanoparticle, and a hydrogen sensor comprising the chemochromic nanoparticle. Specifically, the chemichromic nanoparticles may have a core-shell structure including a core of a hydrated or non-hydrated transition metal oxide and a shell of a metal catalyst. Background technique [0005] Hydrogen fuel energy will not cause environmental pollution and can be recycled infinitely. Therefore, hydrogen fuel energy has recently attracted attention as a new generation of energy that can replace petroleum energy. Therefore, recently, research and development ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78B01J35/00
CPCG01N21/783B01J35/40B01J37/34B01J23/30B01J23/44B01J23/6527F01N2560/024B01J37/035B01J37/343B01J37/345B01J23/58B01J23/60B01J23/62B01J23/626B01J23/6482B01J23/6525B01J23/8906B01J23/892B01J23/8926G01N33/005B01J35/397G01N27/04C01G41/02C01P2006/40B05D5/065B05D3/067B01J35/30
Inventor 鲁容奎李贤埈沈孝燮徐亨卓李英安S·S·卡拉努尔
Owner HYUNDAI MOTOR CO LTD
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