Formation of a Colloidal CdSe and ZnSe Quantum Dots via a Gamma Radiolytic Technique

Abstract

Abstract:Colloidal cadmium selenide (CdSe) and zinc selenide (ZnSe) quantum dots with a hexagonal structure were synthesized by irradiating an aqueous solution containing metal precursors, poly (vinyl pyrrolidone), isopropyl alcohol, and organic solvents with 1.25-MeV gamma rays at a dose of 120 kGy. The radiolytic processes occurring in water result in the nucleation of particles, which leads to the growth of the quantum dots. The physical properties of the CdSe and ZnSe nanoparticles were measured by various characterization techniques. X-ray diffraction (XRD) was used to confirm the nanocrystalline structure, energy-dispersive X-ray spectroscopy (EDX) was used to estimate the material composition of the samples, transmission electron microscopy (TEM) was used to determine the morphologies and average particle size distribution, and UV-visible spectroscopy was used to measure the optical absorption spectra, from which the band gap of the CdSe and ZnSe nanoparticles could be deduced.

Photo-response in chemically synthesized ZnSe nanorod for its application as photosensor

“…Zinc selenide (ZnSe) is a suitable material for optoelectronics devices due to its wide bandgap (2.7 eV) and high optical absorption coefficient, making it ideal for converting light energy to electrical energy in photodetectors [8,15]. Nanostructures of ZnSe can be acquired through diverse procedures, such as hydrothermal method [16], radiation method [16], organometallic vapour phase deposition method [17], solvothermal method, thermal evaporation [18], modified vapour deposition [19], nanostructures of complex hierarchy by assembling small building blocks at the nanoscale [20] and chemical bath deposition [21].…”

Shape Evolution and Control of Wurtzite CdSe Nanocrystals through a Facile One-Pot Strategy

“…Polytypes commonly exist in group II–VI, III–V, and IV-IV compound semiconductors, − whose structures generally display cubic zinc-blende (ZB) and hexagonal wurtzite (WZ) forms. As one of the typical II–VI semiconductors, cadmium selenide (CdSe) has attracted extensive interest over the past 20 years, owing to its robust synthetic method − and its ability to tune the optical behavior across the entire visible spectrum. In this regard, CdSe nanocrystals (NCs) have demonstrated a great variety of applications in optoelectronics ranging from photovoltaics (e.g., solar cells) − to light-emitting diodes, − and also in biomedical imaging …”

Comparative energy bandgap analysis of zinc and tin based chalcogenide quantum dots

“…FIGURE 2. The comparison of bandgap energy variation of ZnSeQDs with respect to the size of QDs, and the experimental results are marked by solid triangle[39][40][41][42][43][44].…”