Optoelectronic properties correlation to preparation of Au/La-oxide nanocomposite films

Abstract

Gold nanoparticles were grown in La-oxide thin films deposited on quartz and silicon substrates. These films were annealed in pure hydrogen gas atmosphere at 300°C for different durations 15 min, 30 min, and 45 min and characterised by the X-ray fluorescence (XRF) and X-ray diffraction. The matrix La-oxide remained amorphous up to 400°C. The fraction of Au in La-oxide host material was 7 % molar with crystallite size of 6.8 nm. The Au NPs slightly grew by annealing in H2 gas at 300 K. The samples were investigated by UV-Vis-NIR absorption spectroscopy and dc-electrical measurements. They exhibit conducting properties and with H2 gas annealing, they showed red shifting of the bandgap with remarkable reduction of optical absorption coefficient by ~25 % and remarkable increase in electrical conductivity ~124 %. A global study of the influence of low-temperature post annealing in H2 gas on the electrical, structural, optical, and optoelectronic properties was conducted

Susceptibility in a Coupled Double Quantum Dot-Metal Nanoparticle System under Standing Wave Field

“…It was assumed that the background dielectric constant is . For simplicity, the relaxation times ( ) for the DQD were taken to be the same [43,44].The MNP dielectric constant of the Au bulk dielectric constant [45].We referred for ( and ) values in the figures, i.e., ( ) [14,17].…”