Controlling the Schottky Barrier at the Pt/TiO2Interface by Intercalation of a Self-Assembled Monolayer with Oriented Dipole Moments

Taishi Ano, Fuminao Kishimoto, Shuntaro Tsubaki, Yi Hsien Lu, J. Nathan Hohman, Masato M. Maitani, Miquel Salmeron, Yuji Wada

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)

抄録

Interfacial Schottky barriers can impact the catalytic function of Pt on TiO2. Since the electronic structure is characteristic of each material, it may be advantageous to tailor the interfacial Schottky barrier by the addition of adsorbed layers. Here, we show that the Schottky barrier in Pt/TiO2can be mitigated by the insertion of self-assembled monolayers (SAM) of carboranethiols that possess an oriented dipole moment. A Pt substrate with the SAM on which TiO2nanoparticles are deposited is used to that effect. Kelvin Probe Force Microscopy shows thatm-9-carboranethiolate SAM with perpendicular dipole moments decreases the potential difference between TiO2and Pt by ∼0.3 eV due to the interfacial electric field of the SAM. Our findings open new opportunities for tailoring interfacial electronic structures not only in the metal-semiconductor junction, but also the semiconductor heterojunctions.

本文言語英語
ページ(範囲)13984-13989
ページ数6
ジャーナルJournal of Physical Chemistry C
125
25
DOI
出版ステータス出版済み - 7月 1 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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