Facile Sonochemical Synthesis of Highly Luminescent ZnS—Shelled CdSe Quantum Dots.

Abstract

Sonochemistry H 3000Facile Sonochemical Synthesis of Highly Luminescent ZnS-Shelled CdSe Quantum Dots. -Highly luminescent quantum dots with quantum yields of 50 to 60%, narrow emission spectra, and size distributions of about 10% are prepared by sonochemically ZnS shelling of CdSe quantum dot cores which are also sonochemically obtained starting with Cd(OAc)2, trioctyl phosphine oxide, and hexadecylamine. Quantum dot synthesis via ultrasound has several attractive features, such as straightforward process control in the absence of any outside heat sources and the ability to achieve nucleation and growth at bulk temperatures notably lower than those required for thermal techniques. The approach is accessible to laboratories with limited synthetic expertise to create CdSe/ZnS quantum dots. -(MURCIA, M. J.; SHAW, D. L.; WOODRUFF, H.; NAUMANN*, C. A.; YOUNG*, B. A.; LONG, E. C.; Chem.

Membrane mimetic surface functionalization of nanoparticles: Methods and applications

“…QDs thus have been modified with carboxylic acid groups and even encapsulated into polymer nanoparticles to increase biocompatibility and water solubility [65-67]. Another approach that has been taken to enhance the biocompatibility of QDs is their encapsulation within lipid micelles [3, 68-79]. Further bimolecular modifications of the lipidated QDs facilitate targeted imaging of various tissues [80-83].…”

“…Due to the superior optical properties of QDs as fluorescence emitters compared to that of conventional organic dyes used in fluorescence-based applications, fluorescence analyses of QDs have become a standard evolving into fluorescence correlation spectroscopy (FCS) [71]. FCS allows for the measurement and identification of QDs of varying size and surface functionalization as well as concentration and kinetic reaction rates by measuring the fluctuations in fluorescence intensity [79]. This analytical method can not only be employed in the characterization of lipidated-QDs but can be used to study the interactions of such particles with biosystems.…”

Optical Fiber Sensing Using Quantum Dots

“…This method is particularly attractive when readily available air-stable precursors can be employed in a one-step process to obtain nanocrystalline materials; this has been clearly the case of the synthesis of several metal sulphides from dithiocarbamato or xantate complexes [36, 37]. This approach has also been investigated to coat CdSe QDs with ZnS and CdS, either by the thermal decomposition of the respective metal dithiocarbamate complexes [38] or via sonochemical decomposition of metal xanthates [39]. …”