Alternate Multilayer Deposition from Ammonium Amphiphiles and Titanium Dioxide Crystalline Nanosheets Using the Langmuir−Blodgett Technique

A new type of TiO 2 nanosheet−organic complex multilayer film was successfully prepared by the Langmuir−Blodgett technique. Surface pressure−area ( π − A ) curves demonstrated that a stable monolayer of dioctadecyldimethylammonium bromide (DODAB) was formed on an aqueous suspension of TiO 2 nanosheets derived from an exfoliated layered titanate, H x Ti 2 - x /4 □ x /4 O 4 ·H 2 O ( x ∼ 0.7; □, vacancy). The hybrid monolayer of the ammonium amphiphiles and the TiO 2 nanosheet was quantitatively transferred onto a hydrophobic quartz plate to form a multilayer film. X-ray diffraction measurements confirmed the formation of an ordered structure of DODAB/TiO 2 with an interlayer distance of 3.4 nm.