Hydrogen diffusion mechanism in ultra-thin Pd alloys by torsional oscillator

2011 Fiscal Year Final Research Report

• Project/Area Number: 21760025
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: AOKI Yuki 東京工業大学, 大学院・総合理工学研究科, 助教 (60514271)
• Project Period (FY): 2009 – 2011
• Keywords: 水素 / シリコン基板 / 透過 / 超薄膜 / 界面 / 吸着 / 拡散

Research Abstract

The technological innovation for improvement of the hydrogen storage efficiency is expected. In the viewpoint of the hydrogen absorption in the atomic level, the hydrogen molecule dissociatively adsorbs at the Pd top surface. Subsequently, the hydrogen atom diffuses into the bulk. During the diffusing process toward the bulk, the atomic hydrogen goes through the very near surface region, whose potential energy is drastically different than that of the bulk. Though this very near surface region is very narrow as 1 or 2 atom layers, every hydrogen atom stores into the bulk or releases to the vacuum via this region. Therefore, the investigation of the hydrogen adsorption or desorption mechanism at this peculiar very near surface region is a key for improvement of the hydrogen storage efficiency. This study focuses to the hydrogen adsorption or desorption mechanism at the very near surface region.

Research Products

• [Journal Article] Quantum Interference of Rashba-type Spin-split Surface State Electrons (2011)
  • Author(s): H. Hirayama, Y. Aoki, and C. Kato
  • Journal Title: Phys. Rev. Lett. Volume: 107 Pages: 0277204(1)-(4)
• [Journal Article] Hydrogen chemisorption on Si(111)√<3>×√<3> R30-B passivated surface studied by thermal desorption and scanning tunneling microscopy (2011)
  • Author(s): Y. Aoki and H. Hirayama
  • Journal Title: Surf. Sci. Volume: 605 Pages: 1394-1398
• [Journal Article] Surface Majorana Cone of the Superfluid^3<He> B Phase (2011)
  • Author(s): S. Murakawa, Y. Wada, Y. Tamura, M. Wasai, M. Saitoh, Y. Aoki, R. Nomura, Y. Okuda, Y. Nagato, M. Yamamoto, S. Higashitani, and K. Nagai
  • Journal Title: J. Phys. Soc. Jpn Volume: 80 Pages: 013602
• [Journal Article] Surface Andreev Bound States of the Superfluid^3<He> B Phase (2011)
  • Author(s): R. Nomura, S. Murakawa, Y. Wada, Y. Tamura, M. Wasai, K. Akiyama, M. Saitoh, Y. Aoki and Y. Okuda
  • Journal Title: Physica E Volume: 43 Pages: 718-721
• [Journal Article] Scanning Tunneling Microscope of Bi-induced Ag(111) Surface Structures (2010)
  • Author(s): C. Kato, Y. Aoki, and H. Hirayama
  • Journal Title: Phys. Rev. B Volume: 82 Pages: 165407-1-7
• [Journal Article] Spin Fluid Dynamics Observed by Magnetic Fountain Effect and Mechanical spin pumping effect in the ferromagnetic superfluid^3<He> A_1 Phase (2010)
  • Author(s): Y. Aoki, A. Yamaguchi, K. Suzuki, H. Ishimoto and H. Kojima
  • Journal Title: Phys. Rev. Volume: 82 Pages: 054527-1-11
• [Journal Article] H adsorption at Ag/Si interfaces in epitaxially grown Ag(111) films on Si(111) 7×7 substrates (2010)
  • Author(s): Y. Aoki, L. Shin, T. Sugimoto, H. Hirayama
  • Journal Title: Surf. Sci. Volume: 604 Pages: 420-423
• [Journal Article] Superfluid transition of a^4<He> thin film pressurized by bulk liquid^3<He> (2010)
  • Author(s): M. Wasai, S. Murakawa, Y. Tamura, Y. Wada, Y. Aoki, R. Nomura, and Y. Okuda
  • Journal Title: J. Low Temp. Phys. Volume: 158 Pages: 268-274
• [Journal Article] Transverse acoustic impedance measurements for surface states of superfluid^3<He> A_1 and A_2 phases (2010)
  • Author(s): S. Murakawa, A. Yamaguchi, M. Arai. M. Wasai, Y. Aoki, H. Ishimoto, R. Nomura, and Y. Okuda
  • Journal Title: J. Low Temp. Phys. Volume: 158 Pages: 141-146
• [Journal Article] Observations on Non-Classical Behavior of Solid^4<He> with Compound Torsional Oscillator (2010)
  • Author(s): M. C. Keiderling, Y. Aoki, and H. Kojima
  • Journal Title: 25^<th> International Conference on Low Temperature Physics(LT25), J. Phys.: Conf. Ser. Volume: 150 Pages: 032040
• [Journal Article] Dislocation-induced Local Modulation of the Surface States of Ag(111) Thin Films on Si(111) 7×7 Substrates (2009)
  • Author(s): K. Sawa, Y. Aoki, and H. Hirayama
  • Journal Title: Phys. Rev. Lett. Volume: 104 Pages: 016806-1-4
• [Journal Article] New Anomaly in the Transverse Acoustic Impedance of Superfluid^3<He>-B with a Wall Coated by Several Layers of^4<He> (2009)
  • Author(s): S. Murakawa, Y. Tamura, Y. Wada, M. Wasai, M. Saitoh, Y. Aoki, R. Nomura, Y. Okuda, Y. Nagato, M. Yamamoto, S. Higashitani and K. Nagai
  • Journal Title: Phys. Rev. Lett. Volume: 103 Pages: 155301-1-4
• [Journal Article] Hydrogen desorption from 6H-SiC(0001) surfaces during graphitization (2009)
  • Author(s): Y. Aoki and H. Hirayama
  • Journal Title: Appl. Phys. Lett. Volume: 95 Pages: 094103-1-3
• [Journal Article] Spin pump for boosting spin polarization of superfluid^3<He> A_1 phase (2009)
  • Author(s): A. Yamaguchi, Y. Aoki, S. Murakawa, H. Ishimoto, and H. Kojima
  • Journal Title: Phys. Rev. B Volume: 80 Pages: 052507-1-4
• [Journal Article] Thickness Dependence of Shockley-type Surface States of Ag(111) Ultra-thin Films on Si(111) 7×7 Substrates (2009)
  • Author(s): K. Sawa, Y. Aoki, and H. Hirayama
  • Journal Title: Phys. Rev. B Volume: 80 Pages: 035428
• [Journal Article] Magnetically induced spin flow and relaxation in superfluid^3<He> A_1"25^<th> International Conference on Low Temperature Physics(LT25) (2009)
  • Author(s): A. Yamaguchi, Y. Aoki, K. Suzuki, H. Ishimoto, and H. Kojima
  • Journal Title: J. Phys.: Conf. Ser. Volume: 150 Pages: 032122
• [Journal Article] Transverse Acoustic Impedance of Normal Liquid^3<He> with^4<He> Coating"25^<th> International Conference on Low Temperature Physics(LT25) (2009)
  • Author(s): Y. Tamura, S. Murakawa, Y. Wada, M. Wasai, M. Saitoh, Y. Aoki, R. Nomura, and Y. Okuda
  • Journal Title: J. Phys.: Conf. Ser. Volume: 150 Pages: 0320106
• [Presentation] Pd(111)/Ag(111)/Si(111)における水素昇温脱離 (2012)
  • Author(s): 青木悠樹、中島翔、平山博之
  • Organizer: 第59回応用物理学関係連合講演会
  • Place of Presentation: 早稲田大学
  • Year and Date: 20120315-18
• [Presentation] Hydrogen chemisorption on Si(111)√<3>×√<3> R30°-B passivated surface (2011)
  • Author(s): Y. Aoki, and H. Hirayama
  • Organizer: The 6th International Symposium on Surface Science(ISSS6)
  • Place of Presentation: Tokyo, Japan
  • Year and Date: 20111211-15
• [Presentation] エピタキシャルグラフェン成長過程に及ぼすB原子の影響 (2011)
  • Author(s): 青木悠樹、小此木佑太、平山博之
  • Organizer: 日本物理学会2011年秋季大会
  • Place of Presentation: 富山大学
  • Year and Date: 20110921-24
• [Presentation] Ag/Si(111)√<3>×√<3> R30°-B界面における水素吸着 (2010)
  • Author(s): 青木悠樹、平山博之
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 20100923-26
• [Presentation] Si(111)√<3>×√<3> R30°-B表面における水素吸着 (2010)
  • Author(s): 青木悠樹、平山博之
  • Organizer: 第71回応用物理学学術講演会
  • Place of Presentation: 長崎大学
  • Year and Date: 20100914-17
• [Presentation] H thermal desorption at Ag/Si(111)√<3>×√<3> R30°-B surface (2010)
  • Author(s): Y. Aoki, and H. Hirayama
  • Organizer: 18th International Vacuum Congress(IVC-18)
  • Place of Presentation: Beijing, China
  • Year and Date: 20100823-27
• [Presentation] 水素吸着したSi(111)√<3>×√<3>-B表面における昇温脱離測定とSTM観察 (2010)
  • Author(s): 青木悠樹、平山博之
  • Organizer: 日本物理学会第66回年次大会
  • Place of Presentation: 新潟大学
  • Year and Date: 20100325-28
• [Presentation] 6H-SiC(0001)再構成表面における水素脱離特性 (2009)
  • Author(s): 青木悠樹、平山博之
  • Organizer: 日本物理学会第64回年次大会
  • Place of Presentation: 熊本大学
  • Year and Date: 20090925-28
• [Presentation] Hydrogen desorption fromultra-thin Ag films on Si(111) substrates (2009)
  • Author(s): Y. Aoki, T. Sugimoto, L. Shi, and H. Hirayama
  • Organizer: The 10th International Conference on Atomically Controlled Surfaces
  • Place of Presentation: Granada, Spain
  • Year and Date: 20090921-25
• [Presentation] Ag/Si(111)上に吸着された水素原子の脱離特性II (2009)
  • Author(s): 杉本匡、青木悠樹、平山博之
  • Organizer: 第56回応用物理学関係連合講演会
  • Place of Presentation: 筑波大学
  • Year and Date: 20090330-0402
• [Remarks]
  • URL: http://www.materia.titech.ac.jp/~hirayama/2009hirayamalabHP/