In this paper, we report on water synthesis with a selective size of AgInS/ZnS quantum dots (QDs) coated with thioglycolic acid and on the analysis of their colloidal stability in water and physiological saline buffers to assess their potential use as a fluorescent label in bioanalysis. Nine fractions of AgInS/ZnS hydrophilic QDs were dispersed in buffer solutions with a wide pH range (3.5–9.5) and investigated by measuring the fluorescence intensity and zeta potential. The results demonstrate the possibility of using water-soluble thioglycolic acid-coated QDs as a surface ligand for immunofluorescent labeling using commonly used buffers. The highest QD stability was observed in the pH range (6.0- 9.5).
In this paper, we report the synthesis of hydrophilic luminescent quantum dots (QDs) of the core/shell structure using two approaches: high-temperature organic synthesis of CdZnSeS/ZnS and aqueous synthesis of AgInS/ZnS. Dihydrolipoic and thioglycolic acids have been used as surface ligands to impart hydrophilic properties. The influence of whole blood and serum on the optical properties of both types of QDs was evaluated for their application in blood analysis. It has been shown that AgInS/ZnS QDs with emission in the red spectral region (λPL = 638 nm) remained the most stable in whole blood samples and its optimal dilutions (up to 1:100, inclusive). Whereas CdZnSeS/ZnS fluorescent in the green region of the spectrum (λPL = 530 nm) showed the best signal of fluorescence (PL) intensity in blood serum samples.
In this contribution, we report synthesis of water-soluble Ag−In−S /ZnS quantum dots (QDs) using low toxic precursors as well as investigation of their optical properties. The QDs were successfully obtained directly in an aqueous environment in two ways: traditional one-pot water synthesis and hydrothermal synthesis in the presence of thioglycolic acid as a stabilizing and reactivity controlling agent. The effect of hydrothermal treatment on water-soluble Ag−In−S/ZnS QDs was shown and it was found that they are resistant for 4 hours autoclaving.
In the present work discusses the factors affecting the brightness and intensity of the photoluminescence of the red phosphor glow based on yttrium oxysulfide activated by europium. The energy during cathode excitation is transferred from the surface of the grain to it is volume either due to the excitation of bulk plasmons (excitation 100 –400 V) or by the migration of minority charge carriers at low voltage (less than 100 V) excitation. With such mechanisms of energy transfer, the optimum grain size of phosphorus is about 1 micron. Therefore, surface treatment was carried out with modifying additives molybdate and ammonium tungstate grains of Y2O2S:Eu phosphors, which makes it possible to obtain powders with a spherical shape of grains not larger than 3-5 μm.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.