69. Magnetron sputter deposited hexagonal boron nitride nanosheets for use of proton exchange membrane fuel cellsYuki Hirata, Kanta Yoshii, Justyna Kulczyk-Malecka, Yagya Regmi, Akira Takahashi, Hiroki Akasaka, Naoto Ohtake33rd International Conference on Diamond and Carbon Materials, Spain, Mallorca, 2023. 968. Effect of the incident behavior of carbon ions on the film properties deposited on the three-dimensional object by FCVA method Yuto Tameno, Yuki Hirata, Takumi Ishikawa, Takeharu Motokawa, Noriko IIda, Hiroki Akasaka, Naoto Ohtake, Hiroshige Matsuoka33rd International Conference on Diamond and Carbon Materials, Mallorca, Spain, 2023. 967. Synthesis of BCN-based nanosheets by SiC pyrolysis and magnetron sputtering methods Hayata Fujimoto, Yuki Hirata, Takumi Ishikawa, Hiroki Akasaka, Naoto Ohtake, Hiroshige Matsuoka33rd International Conference on Diamond and Carbon Materials, Mallorca, Spain, 2023. 966. Characterization of carbon-based nanomaterials precipitated on metal surface via thermal annealing process Kasumi Tsutsumi, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake.33rd International Conference on Diamond and Carbon Materials, Mallorca, Spain, 2023. 965. Structural Analysis of Few-Atomic Layered Hexagonal Boron Nitride Nanosheets Synthesized with Magnetron Sputtering and Heat Annealing ProcessYuki Hirata, Kanta Yoshii, Mikito Yoshizato, Hiroki Akasaka, Naoto Ohtake. Pacific Rim Symposium on Surfaces, Coatings and Interfaces 2022, 2022. 1264. Hardening of metal films deposited by cold spray using light elemental diffusionDaiki Tanaka, Yuki Hirata, Naoto Ohtake, Hiroki AkasakaInternational Conference on Materials & Processing 2022, 2022. 1163. Evaluation of Mechanical and Antibacterial Properties of Cu‐DLC Composite FilmsYucheng Li, Chiaki Koga, Yuki Hirata, Hiroki Akasaka, Hiroyasu Kanetaka, Naoto OhtakeInternational Conference on Materials & Processing 2022, 2022. 1162. Comparative study on the film properties of 3-dimensional ta-C films prepared by CVD and FCVA coating processesYuki Hirata, Kotaro Kawai, Toyohiro Kato, Hayata Fujimoto, Yuto Tameno, Takumi Ishikawa, Hiroshige Matsuoka, Hiroki Akasaka, Naoto Ohtake32nd International Conference on Diamond and Carbon Materials, Lisbon, Portugal, 2022. 961. Synthesis of hexagonal boron nitride nanosheets structure with magnetron sputtering and thermal annealing processYuki Hirata, Kanta Yoshii, Mikito Yoshizato, Hiroki Akasaka, Naoto Ohtake.32nd International Conference on Diamond and Carbon Materials, Lisbon, Portugal, 2022. 9 60. Development of hydrogen-free carburizing process using carbon ions Takeshi Konno, Toyohiro Kato, Toshiaki Yanagida, Hiroshi Inaba, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake 32nd International Conference on Diamond and Carbon Materials, Lisbon, Portugal, 2022. 959. 3D coating of ta-C films using FCVA method (The mechaincal properties of ta-C films deposited on the sidewall) Yuto Tameno, Takumi Ishikawa, Toyohiro Kato, Kotaro Kawai, Hiroki Akasaka, Yuki Hirata, Naoto Ohtake, Hiroshige Matsuoka.,2022 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment, Online, 2022. 858. Study on the surface properties of ta-C films deposited by FCVA method on the trench-shaped target Hayata Fujimoto, Takumi Ishikawa, Kotaro Kawai, Toyohiro Kato, Hiroki Akasaka, Yuki Hirata, Naoto Ohtake, Hiroshige Matsuoka2022 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment, Online, 2022. 857. X-ray photoemission electron microscopy observation of sliding marks on amorphous carbon film after ball on test, Sota Norizuki, Keisuke Suzuki, Sarayut Tunmee, Ukit Rittihong, Chanan Euaruksakul, Ratchadaporn Supruangnet, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka15th International Conference on New Diamond and Nano Carbons (NDNC2022), Kanazawa, Japan, 2022. 656. Evaluation of antibacterial properties of DLC/Cu composite films Yucheng Li, Chiaki Koga, Yuki Hirata, Hiroki Akasaka, Hiroyasu Kanetaka, Naoto Ohtake15th International Conference on New Diamond and Nano Carbons (NDNC2022), Kanazawa, Japan, 2022. 655. Detection of oriented sp2 hybridized carbon structure in amorphous carbon film Naoki Umada, Kazuhiro Kanda, Masato Niibe, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka15th International Conference on New Diamond and Nano Carbons (NDNC2022), Kanazawa, Japan, 2022. 654. Sliding properties of laser irradiated amorphous carbon film Dai Harada, Sarayut Tunmee, Yuko Aono, Chanan Euaruksakunl, Ukit Rittihong, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka15th International Conference on New Diamond and Nano Carbons (NDNC2022), Kanazawa, Japan, 2022. 653. Deposition phenomena investigation of DLC films on inner walls of circular metal tubes by nanopulse plasma CVDYoshinao Iwamoto, Yuki Hirata, Masaaki Nakagawa, Ryota Takamura, Hiroki Akasaka, Naoto Ohtake The 14th International Conference on New Diamond and Nano Carbons, Online, 2021. 6.52. Wear Resistance Improvement of Stainless Steel Plate by Textured-DLC Coatings M. Matsuo, T. Ohsama, Y. Iwamoto, Y. Eyama, H. Yamamoto, S. Tanaka, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake The 14th International Conference on New Diamond and Nano Carbons, Online, 2021. 6.51. Fabrication of metal-carbon composite coating using cold spray techniqueChoi Jongbeom, Nana Okimura, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka The 5th International Conference on Smart Materials and Nanotechnology, Online, 2020. 12. 50. Deposition of electroless Ni plated CNT in high-density by cold spray technique Choi Jongbeom, Wataru Nakayama, Nana Okimura, Takuya Hotchi, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka CIAiS International Symposium 2020 (postponed), Japan, Tokyo, 2020. 2.49. Deposition of Ultra-Thin DLC Films on Nano-Scale Quartz Trench Pattern Kazutoki Iwasa, Yuki Hirata, Junho Choi 25th Annual Conference of Material Research Society of Japan, Japan, Yokohama, 2019. 11.48. Nano carbon contained composite film fabricated by cold spray technique Nana Okimura, Choi Jongbeom, Nobuhisa Ata, Wataru Nakayama, Takatoshi Yamada, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka The 11th annual Recent Progress in Graphene and Two-dimensional Materials Research Conference (RPGR2019), Matsue, Japan, 2019. 10 47. X-PEEM observation of sliding mark on the amorphous carbon film surface after ball on disk test H. Akasaka, K. Suzuki, S. Tunmee, C. Euaruksakul, U. Rittihong, R. Supruangnet, Yuki Hirata, N. Ohtake 30th International Conference on Diamond and Carbon Materials, Seville, Spain, 2019. 946. Synthesis of a-BCN Films an d Characterization of Their Mechanical PropertiesYuki Hirata, Ryotaro Takeuchi, Hiroyuki Taniguchi, Yoshinao Iwamoto, Masao Kawagoe, Hiroki Akasaka, Naoto Ohtake 30th International Conference on Diamond and Carbon Materials, Seville, Spain, 2019. 945. NEXAFS and X-PEEM observation of the damaged area on the amorphous carbon film surface H. Akasaka, K. Suzuki, S. Tunmee, C. Euaruksakul, U. Rittihong, R. Supruangnet, Yuki Hirata, N. Ohtake ASIAN Conference on X-ray Absorption Spectroscopy (ACXAS2019), Chiangmai, Thailand, 2019. 844. Physical Vapor Deposition Growth of Few-Atomic Layered Hexagonal Boron Nitride NanosheetsYuki Hirata, Mikito Yoshizato, Hiroki Akasaka, Naoto Ohtake The 12th Asian Workshop on Micro/Nano Forming Technology, Tokyo, Japan, 2019. 843. Evaluation of Structural and Mechanical Properties of a-BCN Films Deposited by PVD Ryotaro Takeuchi, Yoshinal Iwamoto, Masao Kawagoe, Hiroyuki Taniguchi, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake The 12th Asian Workshop on Micro/Nano Forming Technology, Tokyo, Japan, 2019. 842. Deposition of a-C:H Film on Inner Surface of the Tube by Nanopulse Plasma CVD and Analysis of Plasma Behavior Yuki Hirata, Keitaro Takenami, Ryouta Takamura, Yoshinao Iwamoto, Hiroki Akasaka, Naoto Ohtake 3rd International Conference on Applied Surface Science, Pisa, Italy, 2019. 641. Synthesis of High-Crystalline Hexagonal Boron Nitride Nanosheets on Cu Foil Using Physical Vapor Deposition Mikito Yoshizato, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake 3rd International Conference on Applied Surface Science, Pisa, Italy, 2019. 6 40. Metal matrix composites using surface modified particles fabricated by cold spray technique Nana Okimura, Nobuhisa Ata, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka INTERNATIONAL THERMAL SPRAY CONFERENCE AND EXPOSITION (ITSC2019), Yokohama, Japan, 2019. 5 39. Relationship between structure and electrical conduction properties in hydrogenated amorphous carbon films Masashi Tomidokoro, Tunmee Sarayut, Nakajima Hideki, Rittihong Ukit, Supruangnet Ratchadaporn, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake The 13th New Diamond and Nano Carbon Conference (NDNC 2019), Taiwan, 2019. 538. Decomposition and their structural change by heating on amorphous carbon films Hiroki Akasaka, Sarayut Tunmee, Chanan Euaruksakun, Ukit Rittihong, Ratchadaporn Supruangnet, Yuki Hirata, Naoto Ohtake The 13th New Diamond and Nano Carbon Conference (NDNC 2019), Taiwan, 2019. 537. EVALUATION OF STRUCTURAL AND MECHANICAL PROPERTIES OF 3-DIMENSIONALY COATED a-C:H FILMS Yuki Hirata, Takumi Ishikawa, Junho Choi The 5th Asian Symposium on Material and Processing 2018, Bangkok, Thailand, 2018. 1236. FABRICATION OF ANTI-STICKING DIAMOND-LIKE CARBON COATINGS Jun Enomoto, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake The 5th Asian Symposium on Material and Processing 2018, Bangkok, Thailand, 2018. 1235. Deposition of DLC films onto inner wall of metal tubes by nanopulse plasma CVD Keitaro Takenami, Ryota Takamura, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake The 5th Asian Symposium on Material and Processing 2018, Bangkok, Thailand, 2018. 1234. Structure and Electrical Condition Characteristics in Hydrogenated Amorphous Carbon Films Masashi Tomidokoro, Sarayut Tunmee, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka The 5th Asian Symposium on Material and Processing 2018, Bangkok, Thailand, 2018. 1233. Tribological Properties of A-BCN:H on Ball Against DLC Films in High Humidity Air Keisuke Suzuki, Tetsuya Yamamoto, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka The 5th Asian Symposium on Material and Processing 2018, Bangkok, Thailand, 2018. 1232. Effects of Deposition Condition of A-BCN:H Films from Tri-Methyl-Borazine on True Densities Saaya Matsubara, Tetsuya Yamamoto, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka The 5th Asian Symposium on Material and Processing 2018, Bangkok, Thailand, 2018. 1231. DEPOSITION OF a-BCN FILMS AND EVALUATION OF ITS MECHANICAL PROPERTIES Hiroyuki Taniguchi, Yoshinao Iwamoto, Masao Kawagoe, Ryotaro Takeuchi, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake The 5th Asian Symposium on Material and Processing 2018, Bangkok, Thailand, 2018. 12 30. Steel Coating Deposited by Cold Spray Method From Steel Particles Wataru Nakayama, Nobuhisa Ata, Nana Okimura, Satoshi Momozono, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka The 5th Asian Symposium on Material and Processing 2018, Bangkok, Thailand, 2018. 1229. DESIGN OF DIAMOND-LIKE CARBON COATINGS FOR SEVERE ENVIRONMENT USE Takuya Osawa, Yuya Eyama, Makoto Matsuo, Hiroshi Yamamoto, Shinji Tanaka, Masao Kikuchi, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake The 5th Asian Symposium on Material and Processing 2018, Bangkok, Thailand, 2018. 1228. Effects Of Laser Irradiation Conditions On Mechanical Properties By Selective Laser Melting Yuji Kusaki, Yuki Hirata, Shinya SasakiEuro PM 2017 congress & Exhibition, Milan, Italy, 2017. 10.27. Analysis of microstructure and surface morphology of a-C:H films deposited on a trench targetYuki Hirata, Junho Choi, Shinya Sasaki28th International Conference on Diamond and Carbon Materials, Gothenburg, Sweden 2017. 9.26. Fundamental and Tribological Properties of Thick CPB Keisuke Sato, Hikaru Okubo, Yuki Hirata, Chiharu Tadokoro, Tomoya Fujimori, Ken Nakano, Yoshinobu Tsujii, Shinya Sasaki6th World Tribology Congress, Beijing, China, 2017. 9.25. Generation of friction anisotropy by surface texturing under boundary lubrication Shota Ito, Yuki Hirata, Shnya Sasaki6th World Tribology Congress, Beijing, China, 2017. 9.24. EFFECT OF SURFACE TEXTURE ON FRICTION ANISOTROPY UNDER BOUNDARY LUBRICATION Shota Ito, Yuki Hirata, Shinya Sasaki44th Leeds-Lyon Symposium on Tribology, Lyon, France, 2017.923. TRIBOLOGICAL PROPERTIES OF POROUS STRUCTURED SURFACE MANUFACTURED BY SELECTIVE LASER MELTING Rui Sato, Yuki Hirata, Shinya Sasaki44th Leeds-Lyon Symposium on Tribology, Lyon, France, 2017.922. SYNERGISTIC EFFECTS OF IONIC LIQUIDS AND ZDDP ON TRIBOLOGICAL PROPERTIE UNDER BOUNDARY LUBRICATION Kaisei Sato, Hikaru Okubo, Yuki Hirata, Shinya Sasaki44th Leeds-Lyon Symposium on Tribology, Lyon, France, 2017.921. FLUID-STRUCTURE INTERACTION ANALYSIS FOR INVESTIGATION OF INCRESE IN LOAD CAPACITY MECHANISM ON THE TEXTURED SURFACE Kenta Takahashi, Yuki Hirata, Ryo Tsuboi, Shinya Sasaki44th Leeds-Lyon Symposium on Tribology, Lyon, France, 2017.9 20. WEAR ACCELERATION MECHANISM OF DLC FILMS UNDER BOUNDARY LUBRICATION IN THE PRESENCE OF Mo-CONTAINING LUBRICANT ADDITIVES Hikaru Okubo, Chiharu Tadokoro, Yuki Hirata, Shinya Sasaki44th Leeds-Lyon Symposium on Tribology, Lyon, France, 2017.919. FUNDAMENTAL TRIBOLOGICAL PROPERTIES OF THICK CPB Keisuke Sato, Hikaru Okubo, Yuki Hirata, Chiharu Tadokoro, Tomoya Fujimori, Ken Nakano, Yoshinobu Tsujii, Shinya Sasaki44th Leeds-Lyon Symposium on Tribology, Lyon, France, 2017.9.18. FRICTIONAL PROPERTY WITH 3D CAPILLARY STRUCTURED SURFACE BY SELECTIVE LASER MELTING Hiroaki Maeda, Kazuyuki Itagaki, Hikaru Okubo, Yuki Hirata, Shinya Sasaki44th Leeds-Lyon Symposium on Tribology, Lyon, France, 2017.9.17. DEPENDENCE ON PRECURSOR GAS ON THE a-C:H FILM PROPERTIES DEPOSITED ON A TRENCH TARGETYuki Hirata, Kanju Kitamura, Shinya Sasaki, Junho ChoiXXVI International Materials Research Congress, Cancun, Mexico, 2017. 8.16. In situ Raman observation of structural transformation of diamond-like carbon films lubricated with MoDTC solution Hikaru Okubo, Chiharu Tadokoro, Yuki Hirata, Shinya Sasaki6th European Conference on Tribology, Ljubljana, Slovenia, 2017. 6.15. Lubricating property of cyanobased ionic liquids against tetrahedral amorphous carbon film Shohei Kawada, Seiya Watanabe, Yuki Hirata, Shinya Sasaki6th European Conference on Tribology, Ljubljana, Slovenia, 2017. 6.14. Fundamental and tribological properties of thick CPB Keisuke Sato, Hikaru Okubo, Yuki Hirata, Chiharu Tadokoro, Tomoya Fujimori, Ken Nakano, Yoshinobu Tsujii, Braham Prakash, Shinya Sasaki6th European Conference on Tribology, Ljubljana, Slovenia, 2017. 6.13. Effects of laser power and irradiation condition on properties of selective laser melted IN 718 Yuji Kusaki, Kazuyuki Itagaki, Kan Sugiyama, Yuki Hirata, Shinya Sasaki2017 ASME Manufacturing Science and Engineering Conference, Los Angeles, California, 2017. 6.12. DEVELOPMENT OF SELF-EXUDING SLIDING SURFACE BY USING ADDITIVE MANUFACTURING Kazuyuki Itagaki, Kan Sugiyama, Yuki Hirata, Shinya Sasaki2017 ASME Manufacturing Science and Engineering Conference, Los Angeles, California, 2017. 6.11. Lubricating property of cyano-based ionic liquids against hard materials Shohei Kawada, Seiya Watanabe, Yuki Hirata, Shinya SasakiThe 7th International Conference on Manufacturing Machine Design and Tribology, Jeju, Korea, 2017. 4. 10. In situ Raman observation of structural transformation of diamond-like carbon films lubricated with MoDTC solution Hikaru Okubo, Yuki Hirata, Chiharu Tadokoro, Shinya SasakiThe 7th International Conference on Manufacturing Machine Design and Tribology, Jeju, Korea, 2017. 4. 9. Effect of Ar+ Ion Assist on the Properties of a-C:H Films Deposited on a Trench Yuki Hirata, Koeki Onishi, Shinya Sasaki, Junho ChoiPacific Rim Symposium on Surfaces, Coatings and Interfaces 2016, Hawaii,USA, 2016. 12. 8. Deposition of a-C:H film on inner surface of microchannel Yuki Hirata, Junho Choi25th Annual Conference of Material Research Society of Japan, Japan, Yokohama, 2015. 12. 7. UV Raman Study of a-C:H Films Deposited on Trench Sidewall Junho Choi, Hayato Shimozono, Yuki Hirata, Setsuo Nakao, Haruyuki Yasui25th Annual Conference of Material Research Society of Japan, Japan, Yokohama, 2015. 12. 6. Deposition of a-C:H film on inner surface of High-Aspect-Ratio MicrochannelYuki Hirata, Junho Choi4th Nano Today Conference, Dubai, UAE, 2015. 12. 5. Amorphous Carbon Film as a Mold Release Layer for Nanoimprint LithographyYuki Hirata, Yuya Nakahara, Keisuke Nagato, Takahisa Kato, Junho ChoiInternational Tribology Conference, Tokyo 2015, Tokyo, Japan, 2015. 9. 4. Structual and Mechanical Properties of Amorphous Carbon Films Deposited on the Micro-trench Patterns by Bipolar PBII and Plasma AnalysisYuki Hirata, Junho ChoiInternational Tribology Conference, Tokyo 2015, Tokyo, Japan, 2015. 9. 3. The effects of negative bias voltage on the structural and mechanical properties of amorphous carbon film deposited on the micro-trench patternsYuki Hirata, Junho ChoiMaterials Today Asia 2014, Kowloon, Hong Kong, 2014. 12. 2. DLC coating on a trench-shaped target by bipolar PBIIYuki Hirata, Takahisa Kato, Junho Choi10th International Conference on the Science of Hard Materials, Cuncun, Mexico, 2014. 3. 1. DLC coating on a micro-trench using bipolar PBII Junho Choi, Hideyuki Tokioka, Wonsoon Park, Yuki Hirata, Takahisa KatoCollaborative Conference on Materials Research 2013, Jeju, Korea, 2013. 6.
▮ Invited Lecture
5. 究極の表面を創る－異分野融合研究のすゝめYuki Hirata日本機械学会 シンポジウム、2021. 1（Online key lecture） 4. BCN系アダマント薄膜の構造と機械特性の相関および3次元合成技術の開発 Yuki Hirataニューダイヤモンドフォーラム シンポジウム、2020. 11（Online key lecture） 3. Evaluation of Structural and Mechanical Properties of 3-Dimensionaly Coated a-C:H Films Yuki HirataFraunhofer Institute for Material and Beam Technology IWS, Dresden, Germany, 2019. 3 (Lecture) 2. Development of 3-Dimensional a-C:H film coating technique and analysis of plasma behavior Yuki HirataTechnische Universität Darmstadt, Darmstadt, Germany, 2017. 11 (Lecture) 1. Dependence of precursor gas on the a-C:H films properties deposited on a trench target Yuki HirataLuleå University of Technology, Luleå, Sweden, 2017. 9 (Lecture)