Designing Local Microwave Heating of Metal Nanoparticles/Metal Oxide Substrate Composites

Taishi Ano, Shuntaro Tsubaki, Satoshi Fujii, Yuji Wada

研究成果: ジャーナルへの寄稿学術誌査読

2 被引用数 (Scopus)

抄録

Microwave (MW) heating promotes various reactions catalyzed by supported metal nanoparticles (NPs); the mechanism is based on selectively heating the NPs, thereby inducing hot spots at the active reaction sites. Here, we demonstrate the effects of the sizes and loadings of platinum (Pt) NPs supported on single-crystal metal oxide (MOx) substrates (Al2O3, MgAl2O4, TiO2, SrTiO3) having different relative permittivities and conductivities. Considerable heating occurred when Pt NPs were deposited on MOxsubstrates having low relative permittivities and conductivities, indicating that the MW transparency of the substrate is the most critical parameter. Magnetic field heating was preferred when the loading amount of Pt NPs was large. Electromagnetic field simulations suggested that the electric field concentration between Pt NPs formed local hot spots. Moreover, the MW absorption behavior of the NP/MOxcomposite depended on the conductivity of the supported metal, and the frequency of the MWs. We conclude that the relative permittivity and conductivity of the MOxsupport are the most important parameters for ensuring efficacious MW heating by Pt NPs, followed by size and loading of the supported metal NPs. The synergistic effect of the metal NPs and MOxsupport results in targeted MW heating of the supported metal catalyst.

本文言語英語
ページ(範囲)23720-23728
ページ数9
ジャーナルJournal of Physical Chemistry C
125
43
DOI
出版ステータス出版済み - 11月 4 2021
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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