Composite films of polycations and TiO2 nanoparticles with photoinduced superhydrophilicity.
We apply herein the reactive layer-by-layer (LBL) spray deposition of a polycation (polyethyleneimine, PEI) and a water soluble initiator of titanium dioxide [Ti(IV) bis(ammoniumlactato)dihydroxide, TiBisLac] to produce thin hybrid films containing PEI and nearly monodisperse TiO(2) anatase nanoparticles. The thickness of these coatings can be finely adjusted by either changing the number of deposition steps or the TiBisLac concentration. These films display intense absorption in the UV range and nearly full transparency above 365 nm and they also display photoinduced superhydrophilicity. These coatings can be produced either by reactive LBL spray deposition or reactive LBL dipping and may offer a wide range of applications from biology, as antibacterial coatings, to photoactive materials.
Unité propre 22, Institut Charles Sadron, 23 rue du Loess, BP 84047, F-67034 Strasbourg Cédex 2, France.
Nicolas
N
Laugel
Joseph
J
Hemmerlé
Nadia
N
Ladhari
Youri
Y
Arntz
Eric
E
Gonthier
Youssef
Y
Haikel
Jean-Claude
JC
Voegel
Pierre
P
Schaaf
Vincent
V
Ball
D002412:Cations; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D010777:Photochemistry; D055672:Static Electricity; D014025:Titanium / Q000737:chemistry*
D002412:Cations; D020099:Coated Materials, Biocompatible; C009495:titanium dioxide; D014025:Titanium