The colloidal W nanoparticles were synthesized following a similar approach to the so-called hot-matrix synthesis used for the preparation of semiconductor nanocrystals. The highest photocurrent of ∼830 mA/cm2 at 1.9 V vs. RHE was obtained with a 900 nm thick WO3 film. Incident photon-to-current efficiency (IPCE) studies showed that WO3 electrodes exhibit IPCE values as high as 66%. The proposed approach herein for fabrication of textured WO3 can be extended for the preparation of other metal oxide thin films.
COBISS.SI-ID: 3680763
The photocatalytic performance of complex oxide heterostructures depends primarily on the interfacial coupling of the two component structures. This interface character inherently varies with the synthesis method. The focus of this article is placed on the interface character of a pulsed laser deposited CoFe2O4/BaTiO3 thin film. The structural TEM analysis shows that within this somehow incompatible composite interface, a different phase is formed corresponding to the compound Ba2Fe3Ti5O15, which belongs to the ilmenite crystal structure of FeTiO3 type. The results suggest a chemical activity between these two oxides, which could lead to the synthesis of complex engineered interfaces.
COBISS.SI-ID: 3676923
Fe-doping is known to reduce the bandgap in semiconductor oxide. For that reason all the effects of Fe-doping on electronic state of heksagonal barium titanate were studied. Our results demonstrate that the intricate static magnetism of the hexagonal phase is not intrinsic, but rather stems from sparse strain-induced pseudocubic regions. We point out the vital role of internal strain in establishing defect ferromagnetism in systems with competing structural phases.
COBISS.SI-ID: 28275751
A hybrid titania-silica cold-setting sol has been developed that can be deposited onto a wide variety of surfaces without the need for high-temperature fixing and that is suitable for material printing deposition. Thin hybrid titania-silica coatings were patterned onto glass and PET substrates by inkjet printing. Well-defined hybrid titania-silica patterns, with thicknesses ranging from 40 to 400 nm, were fabricated by overprinting 1 to 10 layers. Excellent mechanical, optical, and photocatalytic properties were observed, making the reported material well suited for the fabrication of transparent self-cleaning coatings both on mineral and organic substrates. The printed patterns exhibit photoelectrochemical activity that can be further improved by thermal or photonic curing. A concept of fully printed interdigitated photoelectrochemical cells on flexible PET substrates utilizing the reported hybrid photocatalyst is disclosed as well.
COBISS.SI-ID: 3975163
We showed on a unique paradigm for intermolecular charge transport mediated by diffuse atomic-like orbital (SAMOs), typically present in conjugated hollow shaped molecules, is investigated for C20H10 molecular fragments by means of G0W0 theory. This opened the possibility of using a new concept for the charge transfer in photocatalytic reactions.
COBISS.SI-ID: 3806203