xSbx thin films recently. The CR and interband transition have been observed clearly at the wide range of the magnetic field with anomalous broad absorption. The third contribution except the bulk electron and hole could be assumed for explaining the origin of the absorption. In this presentation, we will also discuss the possibility of the contribution from the surface carrier to the CR absorption in Bi1-xSbx thin films.Fig. 1 CR spectra in InGaN56Fullerenes is a spherical zero-dimensional molecule composed of hexagonal and pentagonal rings with a network of sp2-hybridized carbon atoms [1]. It can be assembled into various nanostructures with unique shapes and distinct properties. Metal-organic frameworks (MOFs) are highly porous materials with a large surface area and tunable porosity, which are useful in gas/energy storage and catalysis [2]. In this contribution, we report a simple (layer-by-layer (LBL)) yet novel method to prepare MOFOF and its conversion into novel nitrogen-doped cobalt/carbon composite by high temperature carbonization. Fullerene nanotube (FNT) was synthesized by using a dynamic liquid–liquid interfacial precipitation (DLLIP) method. The surface of the FNTs was oxidized by strong acids (H2SO4:HNO3) treatment and MOF (ZIF-67) crystals were grown on the oxidized surface of FNT using LBL technique. The MOFOF was calcinated at high temperature followed by nitrogen-doping under ammonia furnace. Owing to a high specific surface area (1260 m2/g) and unique microstructure, nitrogen-doped cobalt/carbon composite derived from the MOFOF is expected to show high activity in energy conversion (ORR activity). Magneto-optical measurements (Cyclotron resonance, Magneto-PL) are essential for studying not only the optical transition between the Landau levels, but the band parameters in semiconductors and semimetals under high magnetic fields [1]. We have investigated the quantum Hall systems of various compound semiconductors with extremely high mobility. Recent progress of the MOCVD growth technique enables us to study the cyclotron resonance (CR) with the magneto-transport measurements even for InGaN heterostructures. Figure 1 shows typical CR spectra in two-dimensional electron systems in InGaN heterostructures. The electron effective mass has just determined accurately through these experiments for the first time. The CR experiment is also applied for semimetal, such as Bi1-Poster Award NomineeP1-21Nitrogen-Doped Cobalt/Carbon Composite from Metal Organic Framework on Fullerene Self Assemblies (MOFOF) for Energy Conversion ApplicationRabindra Nath Acharyya1,2, Katsuhiko Ariga1,3, and Lok Kumar Shrestha1,2,*1 Research Center for Materials Nanoarchitectonics, National Institute for Materials Science (NIMS)2 Graduated School of Pure and Applied Sciences, University of Tsukuba3 Department of Advanced Materials Science, School of Frontier Sciences, The University of Tokyo[1] K. Ariga, L. K. Shrestha, Mater Adv., 2(2), 582-597 (2021).[2] B.N. Bhadra, L.K. Shrestha, Y. Yamauchi, K. Ariga, ACS Appl Mater Inter., 16, 41363−41370 (2024).P1-22Magneto-optical Studies in 2D Carrier Systems of Semiconductor and Semimetal Under High Magnetic Field Yasutaka ImanakaCenter for Basic Research on Materials, National Institute for Materials Science (NIMS) [1] Y. Imanaka et. al., J. Low Temp. Phys., 170, 389 (2013).
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