Optical Properties of Selenium Quantum Dots Produced with Laser Irradiation of Water Suspended Se Nanoparticles

Abstract

Semiconductor quantum dots (QDs) and their assemblies have shown potential research interest due to their size dependent optical and electronic properties. Laser irradiation of larger sized semiconductor nanoparticles (NPs) suspended into liquid media is an easy, quick, versatile, environmental friendly, and rapidly growing method for the synthesis of QDs through melting/vaporization and fragmentation mechanisms. Most of the available reports in this field are related to the laser induced modification of shape, size, and morphology of noble metal nanoparticles, while only few exist for semiconductors. Synthesis of selenium QDs using laser induced melting/vaporization of water suspended selenium NPs of larger size and studies of their irradiation time or size dependent optical properties are subjects of current investigation. The fundamental wavelength of a pulsed nanosecond Nd:YAG laser is used for the irradiation of water suspended 69 nm average sized NPs for different times of irradiation. UV−visible ab...