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

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)13984-13989
Number of pages6
JournalJournal of Physical Chemistry C
Volume125
Issue number25
DOIs
Publication statusPublished - Jul 1 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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