Enhanced visible light photoactivity of TiO2 photonic crystals modified with silver and platinum nanoparticles

Joanna Ginter (Poland)

Video was recorded during the 5th International research and practice Conference "Nanotechnolgy and Nanomaterials" (NANO-2017)

Titanium dioxide is one of the most promising catalysts, however, because of the wide band gap (3.2 eV), only a small fraction (3-5%) of solar light can be utilized. In recent years, numerous attempts have been undertaken to improve the photocatalytic performance of TiO2, such as noble metal loading to inhibit charge carrier recombination and/or increasing the length of the light path in TiO2. This effective, but rarely used way of increasing the propagation of the light in TiO2 can be achieved via obtaining the photonic crystal (PC) structures. Additionally, the phenomenon of slow photons (SP) occurring in the PC has immense potential to increase the path length of the light due to the reduced photons group velocity. The occurrence of SP have been demonstrated in periodic photonic structures at energies just above and below the photonic band gap (PBG).

The aim of this study was to show the influence of the pore size and modification of PCs by silver (AgNPs) and platinum (PtNPs) nanoparticles on the occurrence of SP effect and hence the photocatalytic activity in the visible light.