Polymetallic citric complexes as precursors for spray-pyrolysis deposition of thin LaFeO3 films

LaFexCo(1–x)O3Thin-Film Oxygen Reduction Catalysts Prepared Using Spray Pyrolysis without Conductive Additives

“…The peak at 2θ = 47.1° has an full width at half-maximum of 0.534 compared to the expected instrument line width of 0.125, indicating that the crystallite size in our material is on the order of 20 nm, as calculated using the Scherrer equation. This is consistent with the crystallite size observed with the spray pyrolysis deposition of La 1– x Ca x MnO 3 (40–70 nm) 16 and LaFeO 3 (25–35 nm); 17 with the crystallite size depending on the spray pyrolysis conditions. Traditional methods of perovskite catalyst preparation require high-temperature calcination steps, resulting in the sintering of the material, producing particles typically ranging in size from 200 nm to 1 μm.…”

Thin Films for Immobilization of Complexes with Optical Properties

“…The method is used for deposition of thin ferrite films [50], thin films of the perovskite LaFeO 3 [51], thin films of TiO 2 (pure or modified) [52][53][54][55], films of poly-(methyl)methacrylate [28], and thin films of cerium-doped yttrium-iron garnet [56], each of them with potential applications in water purification, oxygen sensing, thermosensors, for deposition of thin yttria-stabilized zirconia films [1,57,58], for crystalline and non-crystalline iron oxide (α-Fe 2 O 3 ) thin films onto glass substrates at different temperatures [59,60], highly structured ZnO layers [61], transparent conducting zinc oxide thin films [62], lead(II) oxide thin films [63], nanoporous aluminum oxide [64], europium doped lanthanum oxide films [65], and UV excited green emitting Eu(II) activated BaAl 2 O 4 and SrAl 2 O 4 [66] and etc. Typical spray pyrolysis equipment consists of an atomizer, precursor solution, substrate heater, and temperature controller.…”

“…A nebulizer with nozzle of 0.7 mm in diameter was also used [50]. Microscope slides and optical grade glass of various shapes and sizes were used [51]. The substrate was situated at 20 cm from the nozzle at an angle of 45° and heated at temperatures, depending on the nature of the substrate and of the spraying material and kept within the limits of ±5°C.…”

“…With О 2 as a carrier gas, more uniform films were formed compared with those prepared using N 2 at the same conditions. This is probably due to a more even and complete burning of the organic components in the initial solution, when citric complexes were applied as precursors (Figure 19) [51]. The method is suitable for the production of films up to ~700 nm thickness.…”

“…The method is suitable for the production of films up to ~700 nm thickness. The film thickness above 700 nm can cause cracking during the thermal treatment, following the deposition [51]. Thin films of La 2 Ti 2 O 7 were deposited by spray pyrolysis using as starting material the ethylene glycol solutions of La-Ti citric .…”