公开(公告)号：US20190391122A1

公开(公告)日：2019-12-26

申请号：US16488866

申请日：2018-02-16

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Gaku IMAMURA ,  Genki YOSHIKAWA ,  Takashi WASHIO

IPC: G01N33/00

Abstract: Provided is a novel analysis method which, when a chemical sensor is used to perform a measurement, makes it possible to identify a sample without controlling or monitoring a change in the time the sample is introduced. According to the present invention, a sample can be identified without knowing a change in the time the sample is introduced, by using a chemical sensor having a plurality of channels each having different characteristics to perform a measurement, and performing an analysis on the basis of responses obtained from each channel.

公开(公告)号：US20180356388A1

公开(公告)日：2018-12-13

申请号：US15781924

申请日：2016-11-14

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Kota SHIBA ,  Genki YOSHIKAWA ,  Gaku IMAMURA

IPC: G01N33/22 ,  G01N5/02 ,  G01L1/18 ,  C10L1/04 ,  C10L1/02

CPC classification number: G01N33/22 ,  C10L1/02 ,  C10L1/04 ,  G01L1/18 ,  G01N5/02

Abstract: Provided is a sensor which enables detection/identification of various types of fuels for automobiles by using simple devices. According to the present invention, high-octane gas, regular gas, diesel oil, heating oil, gasoline laced with heating oil, and the like can be clearly identified without using a large-scale analysis such as gas chromatography or mass spectroscopy by using a sensor having a structure in which a surface of a sensor body which detects a surface stress or the like is coated with particles modified with a hydrocarbon group such as an alkyl group.

公开(公告)号：US20230147626A1

公开(公告)日：2023-05-11

申请号：US17914956

申请日：2021-03-19

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Ryo NAKAKUBO ,  Mitsuyoshi ISHIDA ,  Masanori TOHNO ,  Hisami KOBAYASHI ,  Genki YOSHIKAWA ,  Kosuke MINAMI ,  Gaku IMAMURA ,  Hideki MATSUZAKA ,  Takahiro NEMOTO

IPC: G01N33/00

CPC classification number: G01N33/0047

Abstract: An object of the present invention is to make it possible to easily evaluate silage fermentation quality on site or the like. In one embodiment of the present invention, a gas generated from silage is applied to a surface stress sensor, and the amount of either one of organic acids and nitrogen-containing compounds contained in the silage is determined. The surface stress sensor can detect trace components in a gas by a simple device configuration and in simple procedures. Therefore, by utilizing the fact that relationship between the content of these components and the fermentation quality is known, the evaluation of fermentation quality can be easily realized by the above measurement.

公开(公告)号：US20220291185A1

公开(公告)日：2022-09-15

申请号：US17619024

申请日：2020-05-08

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Gaku IMAMURA ,  Kosuke MINAMI ,  Kota SHIBA ,  Genki YOSHIKAWA

IPC: G01N33/00 ,  G01N29/02 ,  G01L1/18 ,  G01N5/02 ,  C08F222/06

Abstract: An object of the present invention is to detect ammonia with high sensitivity and high selectivity using a nanomechanical sensor with a structure that is as simple as possible. A method for detecting ammonia according to an embodiment of the present invention comprises supplying a sample gas possibly containing ammonia to a nanomechanical sensor that detects a stress or a displacement using poly(methyl vinyl ether-alt-maleic anhydride) as a material of a receptor layer, and detecting presence or absence of ammonia or a content of ammonia in the sample gas based on an output signal from the nanomechanical sensor, in which the sample gas is a humidified sample gas with controlled relative humidity.

公开(公告)号：US20220228971A1

公开(公告)日：2022-07-21

申请号：US17605342

申请日：2020-04-14

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Genki YOSHIKAWA ,  Kota SHIBA

IPC: G01N19/00 ,  C08J7/04 ,  C08J5/18

Abstract: The present invention provides a nanomechanical sensor unsusceptible to water vapor, due to very low sensitivity to water vapor, that may interfere with measurement. In an embodiment of the present invention, as a sensitive film material of a nanomechanical sensor such as a surface stress sensor, poly(2,6-diphenyl-p-phenylene oxide) is utilized that is used for adsorption/concentration of a substance present in a trace amount in water or air, and represented by Formula (1) wherein n represents an integer of 1 or more. As can be seen from graphs showing changes over time of response signals in a case where a gas to be measured containing acetone, ethanol, and the like and nitrogen are alternately supplied to the surface stress sensor cyclically, it was confirmed that in the sensitive film of the present invention, adsorption/desorption of the components in the gas to be measured significantly occurs in response to the cyclic change, but the sensitivity to water is very low.

公开(公告)号：US20220057372A1

公开(公告)日：2022-02-24

申请号：US17434911

申请日：2020-02-14

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Taro YAKABE ,  Gaku IMAMURA ,  Genki YOSHIKAWA ,  Akiko NAKAMURA

IPC: G01N33/00 ,  G01N19/00 ,  G01L1/18

Abstract: The present invention provides a hydrogen sensor having a high sensitivity and low hysteresis characteristics while having a simple configuration and low cost. The present invention shows that a membrane-type surface stress sensor having an amorphous palladium-copper-silicon alloy as a sensitive film has low hysteresis and can detect a nitrogen gas to which hydrogen at a very low concentration of 0.25 ppm is added and a pure nitrogen gas with a sufficiently high S/N ratio.

公开(公告)号：US20210396699A1

公开(公告)日：2021-12-23

申请号：US17289394

申请日：2019-11-13

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Kosuke MINAMI ,  Genki YOSHIKAWA

IPC: G01N27/12 ,  G06N20/00

Abstract: The present invention provides a method for analyzing a liquid sample that solves a problem of a kinetically slow equilibrium at a liquid-solid interface, the problem occurring when liquid sample analysis is performed with a chemical sensor. In the method for analyzing a liquid sample according to an embodiment of the present invention, a component to be analyzed in a liquid sample is adsorbed on a receptor layer of a chemical sensor, one or more kinds of gases are then supplied to the chemical sensor, and a response thereof is measured. As a result, since a slow equilibrium at a liquid-solid interface is not used, a high-sensitivity measurement can be performed in a short time, and existing findings regarding analysis of gas samples on which much progress in research has been achieved can be used.

公开(公告)号：US20210190655A1

公开(公告)日：2021-06-24

申请号：US17055687

申请日：2019-06-04

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Kosuke MINAMI ,  Genki YOSHIKAWA ,  Gaku IMAMURA ,  Kota SHIBA

IPC: G01N5/02 ,  G06N20/00 ,  G06N5/04

Abstract: Provided is a novel material analysis technique using a chemical sensor. By reversing the conventional approach, a material to be measured is provided as a receptor of the chemical sensor, and a response signal of the chemical sensor obtained by supplying a known gas or the like to the chemical sensor is obtained. From the response signal, it is possible to identify and distinguish the receptor material, and to obtain its composition and the like. By analyzing the response signal by means of a statistical or machine learning technique such as principal component analysis, linear discriminant analysis, or a support vector machine, the above-mentioned identification and the like can be performed with high accuracy.