Designing nanocomposites using supercritical CO2 to insert Ni nanoparticles into the pores of nanopatterned BaTiO3 thin films

authors	Castro, A; Morere, J; Cabanas, A; Ferreira, LP; Godinho, M; Ferreira, P; Vilarinho, PM
nationality	International
journal	JOURNAL OF MATERIALS CHEMISTRY C
keywords	CARBON-DIOXIDE SOLUTION; NANOSTRUCTURED MATERIALS; REACTIVE DEPOSITION; FLUID DEPOSITION; NICKEL FILMS; METAL; SOLUBILITY; NANOPOROSITY; FABRICATION; SURFACES
abstract	A new concept to prepare nanocomposite thin films is explored. Two chemical-based bottom-up steps are used to design functional films including (i) the block copolymer-assisted self-assembly of a porous matrix; and (ii) the impregnation of nanoparticles from a ferroic phase into the pores by supercritical CO2 deposition. Porous nanopatterned BaTiO3 thin films with ca. 17 nm thickness are prepared using a cost-effective sol-gel solution containing a block copolymer and evaporation-induced self-assembly methodology. Hexagonally arranged pores with a diameter of ca. 95 nm, running perpendicular to the substrate, are filled with Ni nanoparticles using the supercritical fluid deposition technique, obtained from the reduction of hydrated nickel nitrate in a supercritical CO2-ethanol mixture at 250 degrees C. Small Ni nanoparticles of 21 +/- 5 nm size are selectively deposited inside the pores of the porous matrix. Structural and magnetic properties prove the coexistence of both phases.
publisher	ROYAL SOC CHEMISTRY
issn	2050-7526
year published	2017
volume	5
issue	5
beginning page	1083
ending page	1089
digital object identifier (doi)	10.1039/c6tc04232e
web of science category	Materials Science, Multidisciplinary; Physics, Applied
subject category	Materials Science; Physics
unique article identifier	WOS:000395887300010