Identification of surface oxygen vacancy-related phonon–plasmon coupling in TiO ₂ single crystal

Abstract

Oxygen vacancies (OVs) play a critical role in the physical properties and applications of titanium dioxide nanostructures, which are widely used in electrochemistry and photo catalysis nowadays. In this work, OVs were artificially introduced in the surface of a pure TiO 2 single crystal by pulsed laser irradiation. Raman spectra showed that the intensity of E g mode was enhanced. Theoretical calculations disclose that this was caused by the strong coupling effect between the phonon vibration and plasmon induced by the OVs-related surface deformation, and good agreement was achieved between the experiments and theory.

Doped semiconductor nanoparticles for possible daytime radiative cooling applications

“…Due to the large bandgap, they are transparent to visible and near infrared light (the solar spectrum) [18]. Meanwhile, their mid-infrared propert ies can be easily controlled by the doping concentrations during the synthesiz ng process and the plasmon resonance of doped semiconductor nanoparticles may result in a significant absorption enhancement [19][20][21][22][23][24]. Therefore, it is a perfect system for tailoring the infrared emission property on demand without worrying about its transparency to solar irradiance.…”