Patents by Inventor Yutaka Majima
Yutaka Majima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240133832Abstract: To provide a gas sensor with fast response and high sensitivity to oxygen gas. Disclosed is a gas sensor 100 including: a substrate 10; a first pad electrode 12A and a second pad electrode 12B; a nanowire 14 made of a specific metal; and an oxide layer 16 made of a high-resistance semiconductor that is an oxide of a metal different from a metal constituting the nanowire 14. The first pad electrode 12A and the second pad electrode 12B are formed on or above the substrate 10. The nanowire 14 connects the first pad electrode 12A and the second pad electrode 12B and is formed on or above the substrate 10. The oxide layer 16 is formed in contact with the nanowire 14. This contact between the nanowire 14 and the oxide layer 16 provides fast response and high sensitivity to oxygen gas.Type: ApplicationFiled: February 15, 2022Publication date: April 25, 2024Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Yutaka MAJIMA, Trong Tue PHAN
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Patent number: 11529794Abstract: A heteroepitaxial structure includes a first metal portion having a polycrystalline structure, a second metal portion on the first metal portion, the second metal portion has an island-shaped structure on the first metal portion, the second metal portion is provided corresponding to at least one crystalline grain exposed to a surface of the first metal portion, and the second metal portion and the at least one crystalline grain have a heteroepitaxial interface.Type: GrantFiled: March 26, 2021Date of Patent: December 20, 2022Assignee: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Yutaka Majima, YoonYoung Choi, Ikuko Shimada, Ryo Toyama, Mingyue Yang
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Publication number: 20220291194Abstract: A nanopore structure in an embodiment according to the present invention includes a first metal member having a thin film structure and a through hole, and a second metal member arranged to narrow a diameter of the through hole. The first metal member and the second metal member form a nanopore having a pore diameter of 10 nm or less.Type: ApplicationFiled: June 1, 2022Publication date: September 15, 2022Inventors: Yutaka MAJIMA, Trong Tue PHAN
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Patent number: 11380861Abstract: A monomolecular transistor including a first electrode including a first electrode layer and a first metal particle arranged at one end of the first electrode layer, a second electrode including a first electrode layer and a first metal particle arranged at one end of the first electrode layer, a third electrode insulated from the first electrode and the second electrode, a ?-conjugated molecule having a ?-conjugated skeleton. The first metal particle and the second metal particle face each other. The third electrode is arranged adjacent to the gap in which the first metal particle and the second metal particle face each other, and is spaced from the first metal particle and the second metal particle, the ?-conjugated molecule is arranged in a gap between the first metal particle and the second metal particle.Type: GrantFiled: August 27, 2020Date of Patent: July 5, 2022Assignee: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Yutaka Majima, Eiichi Nakamura, Hayato Tsuji, Kyoko Nozaki, Ryo Shintani, Chun Ouyang, Yuma Ito, SeungJoo Lee
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Publication number: 20210213707Abstract: A heteroepitaxial structure includes a first metal portion having a polycrystalline structure, a second metal portion on the first metal portion, the second metal portion has an island-shaped structure on the first metal portion, the second metal portion is provided corresponding to at least one crystalline grain exposed to a surface of the first metal portion, and the second metal portion and the at least one crystalline grain have a heteroepitaxial interface.Type: ApplicationFiled: March 26, 2021Publication date: July 15, 2021Inventors: Yutaka MAJIMA, YoonYoung CHOI, Ikuko SHIMADA, Ryo TOYAMA, Mingyue YANG
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Publication number: 20200395563Abstract: A monomolecular transistor including a first electrode including a first electrode layer and a first metal particle arranged at one end of the first electrode layer, a second electrode including a first electrode layer and a first metal particle arranged at one end of the first electrode layer, a third electrode insulated from the first electrode and the second electrode, a ?-conjugated molecule having a ?-conjugated skeleton. The first metal particle and the second metal particle face each other. The third electrode is arranged adjacent to the gap in which the first metal particle and the second metal particle face each other, and is spaced from the first metal particle and the second metal particle, the ?-conjugated molecule is arranged in a gap between the first metal particle and the second metal particle.Type: ApplicationFiled: August 27, 2020Publication date: December 17, 2020Inventors: Yutaka MAJIMA, Eiichi NAKAMURA, Hayato TSUJI, Kyoko NOZAKI, Ryo SHINTANI, Chun OUYANG, Yuma ITO, SeungJoo LEE
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Publication number: 20200395453Abstract: A nanogap electrode in an embodiment according to the present invention includes a first electrode including a first electrode layer and a first metal particle arranged at one end of the first electrode layer, and a second electrode including a second electrode layer and a second metal particle arranged at one end of the second electrode layer. The first metal particle and the second metal particle are arranged opposite to each other with a gap therebetween, and a width from one end to the other end of the first metal particle and the second metal particle is 20 nm or less. The gap between the first metal particle and the second metal particle is 10 nm or less.Type: ApplicationFiled: August 28, 2020Publication date: December 17, 2020Inventors: Yutaka MAJIMA, YoonYoung CHOI, Ain KWON
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Patent number: 10170547Abstract: A nanodevice capable of controlling the state of electric charge of a metal nanoparticle is provided. The device includes: nanogap electrodes 5 including one electrode 5A and the other electrode 5B disposed so as to have a nanosize gap in between; a nanoparticle 7 placed between the nanogap electrodes 5; and a plurality of gate electrodes 9. At least one of the plurality of gate electrodes 9 is used as a floating gate electrode to control the state of electric charge of the nanoparticle 7, which achieves a multivalued memory and rewritable logical operation.Type: GrantFiled: August 25, 2015Date of Patent: January 1, 2019Assignee: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Yutaka Majima, Toshiharu Teranishi, Shinya Kano, Eiki Aoyama
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Patent number: 10164080Abstract: Art electrode pair enables the performance of a device to be accurately delivered, a method for manufacturing the same. An electrode pair 10, wherein one electrode 12A and the other electrode 12B are provided on the same plane so as to face each other with a gap 17 therebetween, and portions of the one electrode 12A and the oilier electrode 12B facing each other are respectively curved so as to get away from the plane along a direction nearing each other. This electrode pair 10 is manufactured by preparing, as a sample, a substrate on which a pair of seed electrodes is formed with a space therebetween so as to have an initial gap, immersing the sample in an electroless plating solution, changing the electroless plating solution after a lapse of a certain period of time, and adjusting the number of times of changing.Type: GrantFiled: March 9, 2014Date of Patent: December 25, 2018Assignee: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Yutaka Majima, Toshiharu Teranishi, Shuhei Takeshita
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Patent number: 9825161Abstract: Provided is a logical operation element that performs logical operations on three or more inputs using a single unique device. The logical operation element 30 is provided with an electrode 5A and the other electrode 5B that are provided to have a nanogap, a metal nanoparticle 7 arranged between the electrode 5A and the other electrode 5B in insulated state, and a plurality of gate electrodes 5C, 5D, 11, 11A, 11B for adjusting a charge of the metal nanoparticle 7. Electric current that flows between the electrode 5A and the other electrode 5B is controlled in accordance with the voltage applied to three or more of the gate electrodes 5C, 5D, 11, 11A, 11B.Type: GrantFiled: March 9, 2014Date of Patent: November 21, 2017Assignee: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Yutaka Majima, Toshiharu Teranishi, Kazuhiko Matsumoto, Kenzo Maehashi, Tomofumi Susaki, Yasuhide Ohno, Kosuke Matsuzaki, Guillaume Hubert Frederic Hackenberger
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Publication number: 20170288017Abstract: A nanodevice capable of controlling the state of electric charge of a metal nanoparticle is provided. The device includes: nanogap electrodes 5 including one electrode 5A and the other electrode 5B disposed so as to have a nanosize gap in between; a nanoparticle 7 placed between the nanogap electrodes 5; and a plurality of gate electrodes 9. At least one of the plurality of gate electrodes 9 is used as a floating gate electrode to control the state of electric charge of the nanoparticle 7, which achieves a multivalued memory and rewritable logical operation.Type: ApplicationFiled: August 25, 2015Publication date: October 5, 2017Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Yutaka Majima, Toshiharu Teranishi, Shinya Kano, Eiki Aoyama
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Patent number: 9595604Abstract: Provided is an electronic element that functions as a switch or memory without using metal nanoparticle. The electronic element includes: one electrode 5A and an other electrode 5B arranged to have a nanogap therebetween; and halide ion 6 provided between the electrodes 5A and 5B; and on one of the electrodes.Type: GrantFiled: March 9, 2014Date of Patent: March 14, 2017Assignee: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Yutaka Majima, Toshiharu Teranishi, Yasuo Azuma, Masanori Sakamoto, Shinya Kano, Daniel Eduardo Hurtado Salinas
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Publication number: 20160300915Abstract: A substrate 1 having metal layers 2A and 2B arranged to form a gap is dipped in an electroless plating solution mixed an electrolyte solution including metal ions with a reducing agent and a surfactant. Metal ions are reduced by the reducing agent to be precipitated on the metal layers 2A and 2B, and the surfactant is adhered to a surface of the metal on the metal layers, thereby forming a pair of electrodes 4A, 4B to be controlled to have a nanometer sized gap. These steps enable to provide a method for fabricating nanogap electrodes, a nanogap electrodes array, and a nanodevice with the same.Type: ApplicationFiled: March 14, 2016Publication date: October 13, 2016Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Yutaka Majima, Toshiharu Teranishi, Taro Muraki, Daisuke Tanaka
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Patent number: 9412944Abstract: An organic molecular memory in an embodiment includes a first electrode having a first work function; a second electrode having a second work function; and an organic molecular layer provided between the first electrode and the second electrode, the organic molecular layer containing a first organic molecule chemically bonded to the first electrode, the first organic molecule having a resistance-change type molecular chain, and the first organic molecule having a first energy level higher than the first work function, and a second organic molecule chemically bonded to the second electrode and the second organic molecule having a second energy level higher than the second work function and lower than the first energy level.Type: GrantFiled: September 2, 2015Date of Patent: August 9, 2016Assignee: Kabushiki Kaisha ToshibaInventors: Hideyuki Nishizawa, Yusuke Tanaka, Koji Asakawa, Yutaka Majima
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Patent number: 9412943Abstract: An organic molecular memory in an embodiment includes a first conductive layer; a second conductive layer; and an organic molecular layer provided between the first conductive layer and the second conductive layer, the organic molecular layer including an organic molecule having an oligophenylene ethynylene backbone, the oligophenylene ethynylene backbone including three or more benzene rings, and the oligophenylene ethynylene backbone including two fluorine atoms added in ortho positions or meta positions of one of the benzene rings other than benzene rings at both ends.Type: GrantFiled: September 1, 2015Date of Patent: August 9, 2016Assignee: Kabushiki Kaisha ToshibaInventors: Koji Asakawa, Yutaka Majima, Hideyuki Nishizawa, Yusuke Tanaka, Shigeki Hattori
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Publication number: 20160197172Abstract: Art electrode pair enables the performance of a device to be accurately delivered, a method for manufacturing the same. An electrode pair 10, wherein one electrode 12A and the other electrode 12B are provided on the same plane so as to face each other with a gap 17 therebetween, and portions of the one electrode 12A and the oilier electrode 12B facing each other are respectively curved so as to get away from the plane along a direction nearing each other. This electrode pair 10 is manufactured by preparing, as a sample, a substrate on which a pair of seed electrodes is formed with a space therebetween so as to have an initial gap, immersing the sample in an electroless plating solution, changing the electroless plating solution after a lapse of a certain period of time, and adjusting the number of times of changing.Type: ApplicationFiled: March 9, 2014Publication date: July 7, 2016Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Yutaka Majima, Toshiharu Teranishi, Shuhei Takeshita
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Publication number: 20160087203Abstract: An organic molecular memory in an embodiment includes a first electrode having a first work function; a second electrode having a second work function; and an organic molecular layer provided between the first electrode and the second electrode, the organic molecular layer containing a first organic molecule chemically bonded to the first electrode, the first organic molecule having a resistance-change type molecular chain, and the first organic molecule having a first energy level higher than the first work function, and a second organic molecule chemically bonded to the second electrode and the second organic molecule having a second energy level higher than the second work function and lower than the first energy level.Type: ApplicationFiled: September 2, 2015Publication date: March 24, 2016Applicant: Kabushiki Kaisha ToshibaInventors: Hideyuki NISHIZAWA, Yusuke TANAKA, Koji ASAKAWA, Yutaka MAJIMA
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Publication number: 20160087202Abstract: An organic molecular memory in an embodiment includes a first conductive layer; a second conductive layer; and an organic molecular layer provided between the first conductive layer and the second conductive layer, the organic molecular layer including an organic molecule having an oligophenylene ethynylene backbone, the oligophenylene ethynylene backbone including three or more benzene rings, and the oligophenylene ethynylene backbone including two fluorine atoms added in ortho positions or meta positions of one of the benzene rings other than benzene rings at both ends.Type: ApplicationFiled: September 1, 2015Publication date: March 24, 2016Applicant: Kabushiki Kaisha ToshibaInventors: Koji ASAKAWA, Yutaka Majima, Hideyuki Nishizawa, Yusuke Tanaka, Shigeki Hattori
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Publication number: 20160027908Abstract: Provided is a logical operation element that performs logical operations on three or more inputs using a single unique device. The logical operation element 30 is provided with an electrode 5A and the other electrode 5B that are provided to have a nanogap, a metal nanoparticle 7 arranged between the electrode 5A and the other electrode 5B in insulated state, and a plurality of gate electrodes 5C, 5D, 11, 11A, 11B for adjusting a charge of the metal nanoparticle 7. Electric current that flows between the electrode 5A and the other electrode 5B is controlled in accordance with the voltage applied to three or more of the gate electrodes 5C, 5D, 11, 11A, 11B.Type: ApplicationFiled: March 9, 2014Publication date: January 28, 2016Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Yutaka Majima, Toshiharu Teranishi, Kazuhiko Matsumoto, Kenzo Maehashi, Tomofumi Susaki, Yasuhide Ohno, Kosuke Matsuzaki, Guillaume Hubert Frederic Hackenberger
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Publication number: 20160020311Abstract: Provided is an electronic element that functions as a switch or memory without using metal nanoparticle. The electronic element comprises: one electrode 5A and other electrode 5B arranged to have a nanogap therebetween; and halide ion 6 provided between the electrodes 5A and 5B; and on one of the electrodes. When voltage between the electrodes 5A and 5B is continuously varied from a positive value to a negative value and from a negative value to a positive value, a waveform of electrical current flowing between the electrodes 5A and 5B is asymmetrical. The state of the halide ion 6 is varied in accordance with a value of the voltage that is applied between the electrodes 5A and 5B so that an information-writing-state and an information-erasing-state are maintained in accordance with a value of the electric current that flows between the electrodes 5A and 5B.Type: ApplicationFiled: March 9, 2014Publication date: January 21, 2016Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Yutaka Majima, Toshiharu Teranishi, Yasuo Azuma, Masanori Sakamoto, Shinya Kano, Daniel Eduardo Hurtado Salinas