Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 72: Poster: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales

O 72.14: Poster

Mittwoch, 20. März 2024, 18:00–20:00, Poster D

Tip-enhanced Raman spectroscopy study on anatase TiO₂ surfaces — •Kyungmin Kim^1,2, Daiki Katsube³, Takashi Kumagai⁴, Martin Wolf², Masayuki Abe¹, and Akitoshi Shiotari² — ¹Osaka University, Toyonaka, Japan — ²Fritz Haber Institute, Berlin, Germany — ³RIKEN, Wako, Japan — ⁴Institute for Molecular Science, Okazaki, Japan

Anatase, a crystalline phase of titanium dioxide (TiO₂), is traditionally considered to exhibit higher catalytic activity compared to rutile. Within the various surface orientations of anatase, the (001) surface and its (1x4) reconstructed counterpart have been identified as particularly reactive. The characterization of adsorbates and defects on these surfaces is crucial for comprehending the catalytic properties of the anatase surface. However, achieving this has been technically challenging. In this study, a single-crystal anatase TiO₂ thin film was fabricated on a SrTiO₃(100) substrate using the pulse laser deposition (PLD) technique. Following deposition, reflection high-energy electron diffraction (RHEED) measurements were conducted to verify the (1x4) surface reconstruction. The Anatase TiO₂ film exhibited a thickness of approximately 100 nm. Furthermore, we showcase the utility of tip-enhanced Raman spectroscopy (TERS) in conjunction with scanning tunneling microscopy (STM) under cryogenic conditions for vibrational spectroscopy and nanoscale resolution imaging in characterizing adsorbates and defects on the anatase TiO₂ surface.

Keywords: TERS; STM; TiO2; anatase; PLD