11-Aminoundecanoic acid capped titanium dioxide (capped-TiO2) nanoparticles (63 +/- 2 Angstrom total diameter and 20 - 24 Angstrom core diameter) and polyallylamine hydrochloride, PAK, have been layer-by-layer self-assembled onto precoated (by poly(diallyldimethylammonium chloride), PDDA, or PAH) substrates. The ultrathin S-PDDA(capped-TiO2/PAH)(n) (n = 5, 10, 15) films have been characterized by absorption and surface plasmon spectroscopies, cyclic voltammetry, and scanning force microscopy. AS-PDDA(capped-TiO2/PAH)(10) film coated by a layer of gold has been shown to function as a Schottky diode.