Atomic Armor

External

Prof. Shuichi Ogawa (Nihon University, Japan)
Dr. Akitaka Yoshigoe (Japan Atomic Energy Agency (JAEA), Japan)
Dr. Yasutaka Tsuda (JAEA, Japan)
Prof. Hiroki Ago (Kyushu University, Japan)
Prof. Jodie Lutkenhaus  (Texas A&M University)
Dr. Shin-ichi Fujimori (JAEA, Japan)
Dr. Ikuto Kawasaki (JAEA, Japan)

Internal

Dr. Michael Pettes (MPA-CINT)
Dr. Yongqiang Wang (MST-8)

An article on our paper (Improved robustness of sequentially deposited potassium cesium antimonide photocathodes achieved by increasing the potassium content towards theoretical stoichiometry) was published in LANL STE Highlights.

• Lei Guo, Keisuke Shiohara, Hisato Yamaguchi, Gaoxue Wang, Yuki Okabe, Masashi Nakatake, Shoichi Takakura, Masahiro Yamamoto, Shuichi Ogawa, Yoshifumi Takashima “Improved robustness of sequentially deposited potassium cesium antimonide photocathodes achieved by increasing the potassium content towards theoretical stoichiometry” Scientific Reports 15, 2900 (2025).

November

• Hisato and Nolan visited SPring-8, Japan to perform synchrotron experiments on surface chemistry of materials.

  

October

• Hisato Yamaguchi participated and delivered an invited talk at LANL/NIMS Joint workshop on quantum and functional materials held at National Institute for Materials Science (NIMS), Japan. Thanks to our internal collaborator Michael Pettes for the invitation and organizing the workshop.
• Hisato visited Professor Takahiro Kondo of Tsukuba University, Japan and presented our recent results.
• Satoru was awarded prestigious and competitive PhD fellowship from Japan Society for the Promotion of Science (DC1). His salary and tuition will be covered for next 3 years. Congratulations!

  

August     

• Hisato Yamaguchi gave an invited oral-poster talk at Linear Accelerator Conference (LINAC) 2024 held at the historic Hilton Chicago (in-person).
• Professor Jodie Lutkenhaus of Chemical Engineering at Texas A&M University visited us. Thank you for the visit!

  

• Satoru Emoto of Kyushu University, Japan visited LANL for a 2 months as a summer intern. Satoru is starting his PhD study on chemical vapor deposition of atomically thin hexagonal boron nitride. Welcome Satoru!

  

July

• Hisato, Nolan and Paul visited SPring-8, Japan to perform synchrotron experiments on surface chemistry of materials. Satoru Emoto of Kyushu University, Japan also joined us for the experiments from Japan. We had no sleep but productive time!

  

• Hisato and Paul visited Professor Katsumi Kaneko of Shinshu University, Japan and Hisato presented our recent results. Thank you for hosting us!

  

May

• Yang Hyun Auh (Paul) of Texas A&M University visited LANL for a 2 months summer intern with us. Paul is a Chemical Engineering student who is  funded by LANL for four years of his PhD study.  Welcome Paul!

July

• Hisato visited Professor Hiroki Ago of Kyushu University, Japan and presented our recent results.

  

May

• An article on our paper (work function lowering of LaB6 by monolayer hexagonal boron nitride coating for improved photo- and thermionic-cathodes) was published in LANL STE Highlights.
• We were invited to present our work under the DOE U.S.-Japan Science and Technology Cooperation Program in High Energy Physics at The 45th meeting of the US-Japan Science and Technology Cooperation Program in High Energy Physics in Hawaii (in-person). The topic was on the use of 2D materials as unique protection layer for bialkali photocathodes. 

April

• Our joint proposal with Prof. Jodie Lutkenhaus for 2023 TAMU-LANL Collaborative Program on Two-dimensional MXene Coatings for Protection of Actinides has been awarded as Research Project. A PhD student at Texas A&M Univeristy (TAMU) will be funded for four years by LANL. 

March

• An articles on our paper (Near-Threshold Photoemission from Graphene-Coated [110]) was published in LANL STE Highlights.
• An article on our paper (rugged bialkali photocathodes encapsulated with graphene and thin metal film) was published in LANL STE Highlights.

October

• Hisato Yamaguchi gave an invited talk on the use of 2D materials as unique protection layer for bialkali photocathodes at International Workshop on Energy Recovery Linacs (ERL 22) held at Cornell University (in person). 

July

• Hisato Yamaguchi gave an invited talk at International seminar for "Science of 2.5 Dimensional Materials: Paradigm Shift of Materials Science Toward Future Social Innovation” project , Grant-in-Aid for Transformative Research Areas (A), Ministry of Education, Science, Sports, and Technology (MEXT), Japan (virtual).

May

• Hisato Yamaguchi gave an invited talk on the use of 2D materials as unique protection layer for at the 241st Electrochemical Society (ECS) meeting (presentation via online).
• Hisato Yamaguchi presented a poster on the use of 2D materials as unique protection layer for bialkali photocathodes at Materials Research Society (MRS) Spring meeting in Hawaii (in person).

October

• Hisato Yamaguchi gave an invited talk on the use of 2D materials as unique protection layer for bialkali photocathodes at Photocathode Physics for Photoinjectors conference (virtual).

September

• Hisato Yamaguchi gave an invited talk on the use of 2D materials as unique protection layer for bialkali photocathodes at the Japanese Society of Applied Physics (JSAP)-Optica (OSA) joint symposia (virtual).

December

• Hisato Yamaguchi gave an invited talk on the use of 2D materials as unique protection layer for bialkali photocathodes at the Japanese Beam Physics Society Workshop (virtual).

October

• Our paper on Gas Barrier Properties of Chemical Vapor-Deposited Graphene to Oxygen Imparted with Sub-electronvolt Kinetic Energy was published in Journal of Physical Chemistry Letters. It was selected as an inside cover and news release from LANL. 

June

• Our paper on Graphene as reusable substrate for bialkali photocathodes was published in Applied Physics Letters. An article on our publication news release from LANL. 

November

• Our R&D 100 Award on Atomic Armor was featured by our industorial collaborator, Photonis. 
• Our R&D 100 Award on Atomic Armor was featured in LANL News Release. 

October

• Our R&D 100 Award on Atomic Armor was featured in DOE website.
• Our atomically thin protection coating technology, Atomic Armor won prestigious R&D 100 Award! (Category: IT/Electrical) The technology was also selected as gold medalist in R&D Special Recognition: Market Disruptor - Products. 

June

• Our atomically thin protection coating technology was featured in a local newspaper, Albuquerque Journal. 

April

• Our atomically thin protection coating technology, Atomic Armor was featured in LANL Science Video. 

March

• Science animation on our efforts of protecting photocathodes for accelerator technology has been published on YouTube. 

September

• Our work on free-standing bialkali photocathodes using atomically thin substrates published in Advanced Materials Interfaces was featured in September 2018 issue of Los Alamos National Laboratory Science Highlights.
• Our work on free-standing bialkali photocathodes using atomically thin substrates published in Advanced Materials Interfaces was press released by our contributor's institution, Argonne National Laboratory. 

August

• Our paper on free-standing bialkali photocathodes using atomically thin substrates was published in Advanced Materials Interfaces and selected as the back cover as well as being featured in LANL Mesoscale Connections Spring 2018 Issue. Congratulations, Hisato and Fangze!

• Hisato Yamaguchi*, Ryunosuke Yusa, Gaoxue Wang, Michael T Pettes, Fangze Liu, Yasutaka Tsuda, Akitaka Yoshigoe, Tadashi Abukawa, Nathan A Moody, Shuichi Ogawa* “Work function lowering of LaB6 by monolayer hexagonal boron nitride coating for improved photo- and thermionic-cathodes” Applied Physics Letters 122, 141901 (2023). Selected as an Editor's Pick.
• Lei Guo*, Fangze Liu, Kazuki Koyama, Nolan Regis, Anna M Alexander, Gaoxue Wang, Jeffrey DeFazio, James A Valdez, Anju Poudel, Masahiro Yamamoto, Nathan A Moody, Yoshifumi Takashima, Hisato Yamaguchi* “Rugged bialkali photocathodes encapsulated with graphene and thin metal film” Scientific Reports 13, 2412 (2023). 
• Christopher J Knill, Hisato Yamaguchi, Kenji Kawahara, Gaoxue Wang, Enrique Batista, Ping Yang, Hiroki Ago, Nathan Moody, Siddharth Karkare “Near-Threshold Photoemission from Graphene-Coated (110)” Physical Review Applied 19, 014015 (2023). 

• Shuichi Ogawa*, Hisato Yamaguchi*, Edward F Holby, Takatoshi Yamada*, Akitaka Yoshigoe, Yuji Takakuwa “Gas Barrier Properties of Chemical Vapor-Deposited Graphene to Oxygen Imparted with Sub-electronvolt Kinetic Energy” The Journal of Physical Chemistry Letters 11, 9159–9164 (2020). 

• Hisato Yamaguchi and Nathan A. Moody “Atomic Armor: R&D 100 Award Winner” LANL Science Video (2019). 
• Hisato Yamaguchi and Nathan A. Moody “Atomic Armor for accelerator technology: 2D Shield for photocathodes” Science Animation (2019).

H.Yamaguchi*, Jimmy Granstrom, Wanyi Nie, Hossein Sojoudi, Takeshi Fujita, Damien Voiry, Mingwei Chen, Gautam Gupta, Aditya D. Mohite, Samuel Graham, and Manish Chhowalla* “Reduced Graphene Oxide Thin Films as Ultrabarriers for Organic Electronics” Adv. Energy Mater. 4, 1300986 (2014). *corresponding authors 

• (Invited) LANL/NIMS Joint workshop on quantum and functional materials (in-person), National Institute for Materials Science (NIMS), Japan (October 2024)
• (Seminar) Tsukuba University (in-person), Tsukuba, Japan (October 2024)
• (Invited) LINAC 2024 (in-person), Hilton Chicago (August 2024)
• (Seminar) Shinshu University (in-person), Nagano, Japan (July 2024)

• (Seminar) Kyushu University (in-person), Fukuoka, Japan (July 2023)
• (Invited) "Overcoming quantum efficiency-lifetime limit of photocathodes for accelerator beam source by integration of atomically thin protecting layers" The 45th meeting of the US-Japan Science and Technology Cooperation Program in High Energy Physics (HEP) (in-person), Hawaii, U.S.A. (May 2023)

• (Invited) "2D materials as protective coatings for photocathodes" International Workshop on Energy Recovery Linacs (ERL 22) (in-person) Cornell University, U.S.A. (October 2022)
• (Invited) International seminar for "Science of 2.5 Dimensional Materials: Paradigm Shift of Materials Science Toward Future Social Innovation” project, Grant-in-Aid for Transformative Research Areas (A), Ministry of Education, Science, Sports, and Technology (MEXT), Japan-virtual (July 2022)
• (Poster) "Gas Barrier Properties of Chemical Vapor-Deposited Graphene to Oxygen Imparted with Sub-eV Kinetic Energy" Materials Research Society (MRS) Spring meeting (in-person), Hawaii, U.S.A. (May 2022)
• (Poster) "Photoemission from Bialkali Photocathodes Through an Atomically Thin Protection Layer" Materials Research Society (MRS) Spring meeting (in-person), Hawaii, U.S.A. (May 2022)
• (Invited) "Towards the use of 2D materials as unique protection layer for accelerator beam source" Electrochemical Society (ECS) annual meeting (presented online) Vancouver, Canada (May 2022)

• (Invited) "Towards the use of 2D materials as unique protection layer for bialkali photocathodes" Photophysics for Photoinjectors (P3)-virtual (October 2021)
• (Invited) "Towards the use of 2D materials as unique protection layer for accelerator beam source" JSAP-OSA Joint Symposia-virtual (September 2021)
• (Invited) "Overcoming quantum efficiency-lifetime limit of photocathodes for accelerator beam source by integration of atomically thin protecting layers" DOE Office of Science High Energy Physics (HEP) visit to LANL-virtual (July 2021)

• (Invited) "Armed cathode development" Japanese Beam Physics Workshop-virtual (December 2020)
• (Invited) "Atomic Armor" Science on Tap Bradbury Science Museum, U.S.A. (January 2020)

• Hisato Yamaguchi, Fangze Liu, Nathan A. Moody
  "Photocathodes with an enhancement layer and method of making the same"
  US 11,062,890 (2021).

• Nathan Moody, Jeffrey Pietryga, Gautam Gupta, Aditya Mohite, Vitaly Pavlenko, John Lewellen, Hisato Yamaguchi
  "Photocathodes with protective in-situ graphene gas barrier films and method of making the same"
  US 10,535,486 (2020).