Synthesis and Optical Properties of Cu2O and Au-Cu2O core-shell particles

Abstract

Cuprous oxide (Cu 2 O) and Au-Cu 2 O core-shell nanoparticles were successfully synthesized using the chemical reduction method. The morphology of the synthesized pure Cu 2 Oparticles can be controlled by varying the amount of reducing agent NH 2 OH.HCl. Due to their similar crystal structure and relatively small lattice mismatch Cu 2 O particles are nucleated and locally undergo an epitaxial growth on the surface of the multi-faceted Au seed resulting in a stellated icosahedra Au-Cu 2 O core-shell particle. The extinction spectrum of Cu 2 O particles offew hundred-nm in size is dominated by light scattering, while that of the stellated icosahedra AuCu 2 O core-shell particles exhibits the interband absorption of the Cu 2 O shell only. The interband absorption peak undergoes a blue shift as the shell gets thinner. No prominent SPR of the Au nanocore was observed due to a rather thick Cu 2 O shell.

Optical properties of PbS and Au-PbS Core-Shell Nanoparticles

“…Due to the strong quantum confinement effect, the band gap energy of PbS nanomaterils can be tuned in the near infrared and even in the visible regions leading them to be employed in a lot of applications such as IR detectors, glucose sensor [2,3], phototransitors [4], solar absorber [5] or materials for luminescent display device [6], recently. Furthermore, metal-semiconductor heterostructures such as Au-PbS, Au-Cu 2 O, Ag-Cu 2 O and AuSnO 2 core-shell nanoparticles or TiO 2 -Ag and ZnO-Au composites have been finding themselves in many applications since they can integrate several functionalities required in one single structure [7][8][9][10][11][12].…”