Temporal evolution of optical absorption and emission spectra of thiol capped CdTe quantum dots

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10448904" target="_blank" >RIV/00216208:11320/22:10448904 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ohNk7EtnsL" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ohNk7EtnsL</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00339-022-06087-7" target="_blank" >10.1007/s00339-022-06087-7</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Temporal evolution of optical absorption and emission spectra of thiol capped CdTe quantum dots

Popis výsledku v původním jazyce

To understand the effect of end-groups of thiol-molecules on the structural, absorption, and photoluminescence (PL) properties, CdTe quantum dots (QDs) were synthesized with the capping of thioglycolic acid (TGA), mercaptoethylamine (MEA), l-cysteine (l-Cys) and glutathione (GSH) in aqueous medium. The growth kinetics of the nanocrystals with the variation in the end-groups of thiols has also been spectroscopically investigated. The average sizes of the nanocrystals ranged from 2 to 5 nm, which is well within the quantum confinement regime. The size and phase purity of the QDs were determined by XRD and HRTEM. With respect to size-distribution, the temporal evolution of QDs was found to involve three stages, namely focusing, defocusing and equilibrium. Hydrodynamic sizes were also measured using DLS system. FTIR spectra revealed that the thiol end of the capping agent binds to the particle-surface while the carboxyl or amine group remain free. The multi-colour photoluminescence illustrated the excellent size-tunable optical properties of the QDs. Zeta-potential for TGA-capped CdTe QDs was measured to be - 45 mV, indicating high surface charge and hence greater colloidal stability. Such QDs are well suited for bioimaging and therapeutic applications.

Název v anglickém jazyce

Temporal evolution of optical absorption and emission spectra of thiol capped CdTe quantum dots

Popis výsledku anglicky

To understand the effect of end-groups of thiol-molecules on the structural, absorption, and photoluminescence (PL) properties, CdTe quantum dots (QDs) were synthesized with the capping of thioglycolic acid (TGA), mercaptoethylamine (MEA), l-cysteine (l-Cys) and glutathione (GSH) in aqueous medium. The growth kinetics of the nanocrystals with the variation in the end-groups of thiols has also been spectroscopically investigated. The average sizes of the nanocrystals ranged from 2 to 5 nm, which is well within the quantum confinement regime. The size and phase purity of the QDs were determined by XRD and HRTEM. With respect to size-distribution, the temporal evolution of QDs was found to involve three stages, namely focusing, defocusing and equilibrium. Hydrodynamic sizes were also measured using DLS system. FTIR spectra revealed that the thiol end of the capping agent binds to the particle-surface while the carboxyl or amine group remain free. The multi-colour photoluminescence illustrated the excellent size-tunable optical properties of the QDs. Zeta-potential for TGA-capped CdTe QDs was measured to be - 45 mV, indicating high surface charge and hence greater colloidal stability. Such QDs are well suited for bioimaging and therapeutic applications.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Applied Physics A: Materials Science and Processing

ISSN

0947-8396

e-ISSN

1432-0630

Svazek periodika

128

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

944

Kód UT WoS článku

000862564400001

EID výsledku v databázi Scopus

2-s2.0-85139200711