Szczegóły publikacji
Opis bibliograficzny
Formation and stability of manganese-doped ZnS quantum dot monolayers determined by QCM-D and streaming potential measurements / Magdalena Oćwieja, [et al.], Marta GAJEWSKA, [et al.] // Journal of Colloid and Interface Science ; ISSN 0021-9797. — 2017 — vol. 503, s. 186–197. — Bibliogr. s. 196–197, Abstr. — Publikacja dostępna online od: 2017-05-10
Autorzy (11)
- Oćwieja Magdalena
- Matras-Postołek Katarzyna
- Maciejewska-Prończuk Julia
- Morga Maria
- Adamczyk Zbigniew
- Sovinska Svitlana
- Żaba Adam
- AGHGajewska Marta
- Król Tomasz
- Cupiał Klaudia
- Bredol Michael
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 111772 |
|---|---|
| Data dodania do BaDAP | 2018-02-12 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.jcis.2017.04.059 |
| Rok publikacji | 2017 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of Colloid and Interface Science |
Abstract
Manganese-doped ZnS quantum dots (QDs) stabilized by cysteamine hydrochloride were successfully synthesized. Their thorough physicochemical characteristics were acquired using UV-Vis absorption and photoluminescence spectroscopy, X-ray diffraction, dynamic light scattering (DLS), transmission electron microscopy (HR-TEM), energy dispersive spectroscopy (EDS) and Fourier transform infrared (FT-IR) spectroscopy. The average particle size, derived from HR-TEM, was 3.1 nm, which agrees with the hydrodynamic diameter acquired by DLS, that was equal to 3-4 nm, depending on ionic strength. The quantum dots also exhibited a large positive zeta potential varying between 75 and 36 mV for ionic strength of 10(-4) and 10(-2) M, respectively (at pH 6.2) and an intense luminescent emission at 590 nm. The quantum yield was equal to 31% and the optical band gap energy was equal to 4.26 eV. The kinetics of QD monolayer formation on silica substrates (silica sensors and oxidized silicon wafers) under convection controlled transport was quantitatively evaluated by the quartz crystal microbalance (QCM) and the streaming potential measurements. A high stability of the monolayer for ionic strength 10(-4) and 10(-2) M was confirmed in these measurements. The experimental data were adequately reflected by the extended random sequential adsorption model (eRSA). Additionally, thorough electrokinetic characteristics of the QD monolayers and their stability for various ionic strengths and pH were acquired by streaming potential measurements carried out under in situ conditions. These results were quantitatively interpreted in terms of the three-dimensional (3D) electrokinetic model that furnished bulk zeta potential of particles for high ionic strengths that is impractical by other experimental techniques. It is concluded that these results can be used for designing of biosensors of controlled monolayer structure capable to bind various ligands via covalent as well as electrostatic interactions.
