2023.06.14
Emilio Munoz sandoval先生講演会のご案内
メキシコ・IPICYTのEmilio Munoz Sandval先生をお迎えし、下記の通り講演会を開催します。（対面開催）
Emilio先生は、ナノ構造磁性材料の物理的特性の研究など、ナノテクノロジー分野に大きく貢献されており、現在、IPICYT（ポトシ科学技術研究所）の先端材料部門 (DMA) において、新しいナノ構造材料の磁気特性の分野で研究をなさっています。
この機会にぜひ、Emilio先生のご講演をご聴講ください。
● 日時 2023年7月6日(木) 14:00~15:30
● 場所 信州大学 長野(工学)キャンパス（長野市若里4-17-1）
総合研究棟1階106
● 講師 Dr. Emilio Munoz Sandval（IPICYT主任研究員）
● 講演テーマ " Twisted defects in graphene and transition metal dichalcogenides " ※講演は英語で行います。
【講演要旨】
"Twisted defects in graphene and transition metal dichalcogenides"
Verónica L. Medina Llamas, Omar Fernando de León Ibarra, Florentino López-Urías, Emilio Muñoz-Sandoval. Advanced Materials Division, IPICYT
Juan Luis Fajardo-Díaz, Aarón Morelos-Gómez, Morinobu Endo. Global Aqua Innovation Center and Research Initiative for Supra-Materials, Shinshu University.
Numerous methodologies exist for fabricating graphene and transition metal dichalcogenides, employing diverse substrates, catalysts, and precursor materials. Due to its versatility, cost-effectiveness, and scalability for industrial applications, the most prevalent technique is chemical vapor deposition (CVD). Commonly employed carbon precursors include methane, acetylene, methane-hydrogen, and select alcohols. Copper is the substrate of choice for graphene production due to its near-impermeability to carbon. In the case of transition metal dichalcogenides, the fabrication method involves the utilization of dual heating zones: one for MoO3 powders and another for sulfur powders and additional precursor salts. In our devised strategy, for the production of graphene flakes, we exploit the solubility of carbon in ferrite (α-Fe), estimated to be approximately 0.1% at 700 °C. This scenario enables the generation of graphene layers on the ferrite surface. Nanostructured hematite is employed for this purpose, which upon reduction at 950 °C, yields γ-Fe nanocrystals that subsequently transform into α-Fe upon cooling. Graphene flakes are formed by employing a mixture of benzylamine and 1,2-dichlorobenzene, flown during the cooling process. Conversely, for the fabrication of MoS2 sheets, a pressed sandwich-like structure is utilized as a catalytic precursor, consisting of alternating layers of MoO3 and sulfur. This approach obviates the need for precursor salts and entails using a single furnace and one heating zone.
聴講をご希望の方は、下記までご連絡ください。
AxC-PF事務局・宇田 Email：s_uda@shinshu-u.ac.jp