“…Titanium dioxide (TiO 2 ) is one of the most important semiconductor materials that has been applied in various fields including photocatalysis, photovoltaics, sensors, and rechargeable ion batteries. − However, the photoactivity of TiO 2 materials is limited by wide-bandgap energy (3.2 eV for anatase and 3.0 eV for rutile) and low quantum yield ( ca . 10%). − To enhance the photoactivity efficiency, various strategies have been developed and applied in TiO 2 -based photoactivity materials. − In particular, introducing noble-metal nanoparticles, especially gold (Au) nanoparticles, into TiO 2 materials has been demonstrated as an effective method to overcome the limitations. , On the one hand, the presence of noble-metal nanoparticles on semiconductor (TiO 2 ) can capture photogenerated electrons, promoting the electron–hole separation and improving the quantum yield. , On the other hand, the localized surface plasmon resonance (LSPR) effect of metal nanoparticles can enhance the interaction of localized electric fields with a neighboring semiconductor, leading to the facile formation of electron–hole pairs in the near-surface region of the semiconductor. ,− Recently, Au/TiO 2 nanohybrid materials have attracted significant attention due to the enhanced optical, photocatalytic, and photovoltaic performance. − …”