Importance of buffering nanolayer position in Layer-by-Layer assembly on titania based hybrid photoactivity
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Nanoarchitecture of layer-by-layer (LbL) films is a convenient and simple way to control the photoelectrochemical properties of the semiconductor films. Hereby, we used the combination of polystyrenesulfonate (PSS) and polyethyleneimine (PEI) deposited on the TiO2 film for controlling the photochemical response of the hybrid system. Photogenerated protons on the TiO2 surface are responsible for the acidity change near the irradiated surface. We investigated that the photogenerated protons being absorbed by PEI spatially separated from the TiO2 surface with the nanoscale-thick PSS layer (with thickness ca. 5 nm) lead to the sufficient decrease in photoactivity of the hybrid system TiO2/PSS/PEI ca. 4 times in comparison with pristine TiO2. PEI nanolayer being deposited directly on the TiO2 surface can decrease the photoactivity of the system ca. 2–2.5 times.
Deposition of TiO2 photoactive layer by inkjet printing.
Investigation of photoactivity of the hybrid system based on titanium dioxide and polyelectrolyte layers (polystyrenesulfonate PSS, polyethyleneimine PEI).
Variation in “proton sponge” activity of PEI depending on the distance from TiO2 surface.
PEI nanolayer being deposited directly on the TiO2 surface can decrease the photoactivity of the system ca. 2–2.5 times, nanoarchitecture PSS/PEI – 4–4.5 times in comparison with pristine TiO2.
KeywordsTiO2 Layer-by-layer assembly Photoactivity Sol–gel Polyelectrolytes
The work was supported by RSCF grant no. 17-79-20186 (formation and study of photoactivity of hybrid structures).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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