公开(公告)号：US20230090065A1

公开(公告)日：2023-03-23

申请号：US17800386

申请日：2021-03-05

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Ryo TAMURA ,  Hanxiao XU ,  Koki KITAI ,  Kosuke MINAMI ,  Makito NAKATSU ,  Genki YOSHIKAWA ,  Kota SHIBA ,  Koji TSUDA

IPC: G01N33/00

Abstract: The present invention makes it possible to represent or synthesize any odor by separating the odor into a combination of a relatively small number of odors, similarly to separating a color into three primary colors. Since the “primary odors” corresponding to the primary colors have not yet been ascertained, the present invention provides a feasible method and apparatus in which, instead of presetting such fixed primary odors, the separation, synthesis, and the like can be performed by selecting a subset of odors from among a set consisting of a plurality of odors which subset or odors enables approximation of other odors as much as possible by mixture.

公开(公告)号：US20180017515A1

公开(公告)日：2018-01-18

申请号：US15552949

申请日：2016-02-25

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Kota SHIBA ,  Genki YOSHIKAWA ,  Gaku IMAMURA

IPC: G01N27/12 ,  G01N29/02

CPC classification number: G01N27/125 ,  B82Y15/00 ,  G01N3/00 ,  G01N5/02 ,  G01N9/002 ,  G01N11/16 ,  G01N21/00 ,  G01N27/128 ,  G01N29/022 ,  G01N29/036 ,  G01N2291/0255 ,  G01N2291/0256 ,  G01N2291/0257 ,  G01N2291/02827 ,  G01N2291/0427

Abstract: As a receptor layer, a film of a composite material of a base material such as a polymer and particles that adsorb an analyte is used. When the present invention is applied to a surface stress sensor or the like, the Young's modulus of the receptor layer, which significantly affects detection sensitivity, can be preset with a high degree of freedom, by independently selecting particles that adsorb a desired analyte and a base material that disperses said particles therein.

公开(公告)号：US20210215556A1

公开(公告)日：2021-07-15

申请号：US17267094

申请日：2019-08-28

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Genki YOSHIKAWA ,  Takahiro NEMOTO ,  Makito NAKATSU ,  Naoto TAKEDA ,  Kota SHIBA ,  Kosuke MINAMI

IPC: G01L1/26 ,  G01L1/22 ,  B08B7/00

Abstract: A method for cleaning a receptor layer of a surface stress sensor according to an embodiment of the present invention includes, in a surface stress sensor that detects a change in surface stress of a thin film, the change being caused by a receptor layer disposed on a surface of the thin film, causing at least a part of a surface region of the thin film to generate heat or supplying heat to the receptor layer from the outside of the surface stress sensor. This makes it possible to easily perform efficient cleaning of a surface stress sensor such as a sensor that performs detection using a piezoresistor while avoiding structural complications as much as possible.

公开(公告)号：US20210199563A1

公开(公告)日：2021-07-01

申请号：US17057747

申请日：2019-06-04

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

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

IPC: G01N19/00 ,  G01N5/02

Abstract: In an analysis of a fluid component using a nanomechanical sensor covered with a receptor, the same receptor is caused to express different response characteristics. In a measuring system of analyzing a response when a sample gas and a purge gas are supplied to a nanomechanical sensor while switching the sample gas and the purge gas, a gas (external gas) different from both gases is mixed into a gas channel and supplied to the sensor for measurement. Since a response characteristic of a receptor is modulated by mixing of the external gas, the object described above is achieved.

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：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：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.

公开(公告)号：US20200249201A1

公开(公告)日：2020-08-06

申请号：US16613161

申请日：2018-05-21

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Kota SHIBA ,  Kosuke MINAMI ,  Genki YOSHIKAWA

IPC: G01N29/02

Abstract: The present invention provides a nanomechanical sensor in which a negative influence of water in a sample on measurement is suppressed. In an embodiment of the present invention, as a receptor material of the nanomechanical sensor, a low-hygroscopic material such as polysulfone, polycaprolactone, poly(vinylidene fluoride), or poly(4-methylstyrene) is used. According to this embodiment, a negative influence, such as saturation of a receptor layer by water in the sample, or masking of an output signal based on trace components by an output signal based on water contained in the sample in a large amount, can be suppressed.

公开(公告)号：US20190323982A1

公开(公告)日：2019-10-24

申请号：US16342268

申请日：2017-10-24

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE ,  KYOCERA CORPORATION

Inventor： Genki YOSHIKAWA ,  Kota SHIBA ,  Gaku IMAMURA ,  Takanori YASUDA ,  Kyohei KOBAYASHI ,  Hisashi SAKAI

IPC: G01N27/22 ,  G01N33/00

Abstract: The invention provides: a gas sensor device that is capable of removing a component adsorbed on a gas sensor by relatively simple means and easily restoring a signal baseline of the gas sensor to a constant state; and a method for removing a gas component. The gas sensor device according to an embodiment of the invention includes a gas sensor and cleaning means that contains a liquid for cleaning the gas sensor. The gas sensor includes a sensor main body that is capable of detecting a characteristic parameter of a component present in a gas phase or a liquid phase, and a sensitive membrane that is coated on a surface of the sensor main body and is durable against the liquid.