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Controlling the oxidation state of molybdenum oxide nanoparticles prepared by ionic liquid/metal sputtering to
Kazutaka Akiyoshi1, Tatsuya Kameyama1, Takahisa Yamamoto1
1Graduate School of Engineering, Nagoya University Furo-cho, Chikusa-ku Nagoya 464-8603 Japan torimoto@apchem.nagoya-u.ac.jp.
Abstract:
Nanoparticles composed of molybdenum oxide, MoO , were successfully prepared by room-temperature ionic liquid (RTIL)/metal sputtering followed by heat treatment. Hydroxyl groups in RTIL molecules retarded the coalescence between MoO NPs during heat treatment at 473 K in air, while the oxidation state of Mo species in MoO nanoparticles (NPs) could be modified by changing the heat treatment time. An LSPR peak was observed at 840 nm in the near-IR region for MoO NPs of 55 nm or larger in size that were annealed in a hydroxyl-functionalized RTIL. Photoexcitation of the LSPR peak of MoO NPs induced electron transfer from NPs to ITO electrodes.
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