[16p-D405-1~11] 2.5 Radiation-induced phosphors

[16p-D405-2] Study on surface modification of ZrO₂ nanoparticle for the development of nanoparticle-loaded organic scintillators

〇Akito Watanabe¹, Masanori Koshimizu², Akira Yoko³, Gimyeong Seong⁴, Takaaki Tomai⁵, Tadafumi Adschiri³, Yamato Hayashi¹, Yutaka Fujimoto¹, Keisuke Asai¹ (1.Tohoku Univ., 2.Shizuoka Univ., 3.Tohoku Univ. WPI-AIMR, 4.Tohoku Univ. NICHe, 5.Tohoku Univ. IMRAM)

Keywords:scintillator, nanoparticle, hydrothermal synthesis

Heavy metal loading is essential method for applying organic scintillators for high-energy physics experiment. In this system, however, trade-off relationship between the metal-loading amount and a light yield of the scintillator is considered as a problem. We have proposed nanoparticle-loaded organic scintillators as solutions of this matter. To synthesis well-dispersed nanoparticles for organic scintillator, control of surface modification is required. Here, the following parameters affect dispersibility: surface modification density, the length of modifier molecules, affinity between modifier and solvent, and permeability of solvent molecules to modifier shell. In this study, we synthesized several surface-modified ZrO₂ nanoparticles by supercritical hydrothermal method and developed the nanoparticle-loaded liquid scintillators.