Time-Dependent Growth of Silica Shells on CdTe Quantum Dots

J 2018

Time-Dependent Growth of Silica Shells on CdTe Quantum Dots

MODLITBOVÁ, Pavlína, Karel KLEPÁRNÍK, Zdeněk FARKA, Pavel POŘÍZKA, Petr SKLÁDAL et. al.

Základní údaje

Originální název

Time-Dependent Growth of Silica Shells on CdTe Quantum Dots

Autoři

MODLITBOVÁ, Pavlína (203 Česká republika), Karel KLEPÁRNÍK (203 Česká republika), Zdeněk FARKA (203 Česká republika, domácí), Pavel POŘÍZKA (203 Česká republika), Petr SKLÁDAL (203 Česká republika, garant, domácí), Karel NOVOTNÝ (203 Česká republika, domácí) a Jozef KAISER (203 Česká republika)

Vydání

Nanomaterials, Basel, MDPI, 2018, 2079-4991

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10406 Analytical chemistry

Stát vydavatele

Švýcarsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 4.034

Kód RIV

RIV/00216224:14740/18:00103164

Organizační jednotka

Středoevropský technologický institut

DOI

http://dx.doi.org/10.3390/nano8060439

UT WoS

000436505200084

Klíčová slova anglicky

quantum dots; nanoparticles; photoluminescence spectra; dynamic light scattering; scanning electron microscopy

Štítky

CF CRYO, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 19. 3. 2019 09:09, Mgr. Pavla Foltynová, Ph.D.

Anotace

V originále

The purpose of this study is to investigate the time dependent growth of silica shells on CdTe quantum dots to get their optimum thicknesses for practical applications. The core/shell structured silica-coated CdTe quantum dots (CdTe/SiO2 QDs) were synthesized by the Ströber process, which used CdTe QDs co-stabilized by mercaptopropionic acid. The coating procedure used silane primer (3-mercaptopropyltrimethoxysilane) in order to make the quantum dots (QDs) surface vitreophilic. The total size of QDs was dependent on both the time of silica shell growth in the presence of sodium silicate, and on the presence of ethanol during this growth. The size of particles was monitored during the first 72 h using two principally different methods: Dynamic Light Scattering (DLS), and Scanning Electron Microscopy (SEM). The data obtained by both methods were compared and reasons for differences discussed. Without ethanol precipitation, the silica shell thickness grew slowly and increased the nanoparticle total size from approximately 23 nm up to almost 30 nm (DLS data), and up to almost 60 nm (SEM data) in three days. During the same time period but in the presence of ethanol, the size of CdTe/SiO2 QDs increased more significantly: up to 115 nm (DLS data) and up to 83 nm (SEM data). The variances occurring between silica shell thicknesses caused by different methods of silica growth, as well as by different evaluation methods, were discussed.

Návaznosti

LM2015043, projekt VaV

Název: Česká infrastruktura pro integrativní strukturní biologii (Akronym: CIISB)

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Czech Infrastructure for Integrative Structural Biology

LQ1601, projekt VaV

Název: CEITEC 2020 (Akronym: CEITEC2020)

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, CEITEC 2020

Citovat

MODLITBOVÁ, Pavlína, Karel KLEPÁRNÍK, Zdeněk FARKA, Pavel POŘÍZKA, Petr SKLÁDAL, Karel NOVOTNÝ a Jozef KAISER. Time-Dependent Growth of Silica Shells on CdTe Quantum Dots. Nanomaterials. Basel: MDPI, 2018, roč. 8, č. 6, s. 439-447. ISSN 2079-4991. Dostupné z: https://dx.doi.org/10.3390/nano8060439.

@article{1422595,
   author = {Modlitbová, Pavlína and Klepárník, Karel and Farka, Zdeněk and Pořízka, Pavel and Skládal, Petr and Novotný, Karel and Kaiser, Jozef},
   article_location = {Basel},
   article_number = {6},
   doi = {http://dx.doi.org/10.3390/nano8060439},
   keywords = {quantum dots; nanoparticles; photoluminescence spectra; dynamic light scattering; scanning electron microscopy},
   language = {eng},
   issn = {2079-4991},
   journal = {Nanomaterials},
   title = {Time-Dependent Growth of Silica Shells on CdTe Quantum Dots},
   url = {http://www.mdpi.com/2079-4991/8/6/439},
   volume = {8},
   year = {2018}
}

TY  - JOUR
ID  - 1422595
AU  - Modlitbová, Pavlína - Klepárník, Karel - Farka, Zdeněk - Pořízka, Pavel - Skládal, Petr - Novotný, Karel - Kaiser, Jozef
PY  - 2018
TI  - Time-Dependent Growth of Silica Shells on CdTe Quantum Dots
JF  - Nanomaterials
VL  - 8
IS  - 6
SP  - 439
EP  - 439
PB  - MDPI
SN  - 20794991
KW  - quantum dots
KW  - nanoparticles
KW  - photoluminescence spectra
KW  - dynamic light scattering
KW  - scanning electron microscopy
UR  - http://www.mdpi.com/2079-4991/8/6/439
N2  - The purpose of this study is to investigate the time dependent growth of silica shells on CdTe quantum dots to get their optimum thicknesses for practical applications. The core/shell structured silica-coated CdTe quantum dots (CdTe/SiO2 QDs) were synthesized by the Ströber process, which used CdTe QDs co-stabilized by mercaptopropionic acid. The coating procedure used silane primer (3-mercaptopropyltrimethoxysilane) in order to make the quantum dots (QDs) surface vitreophilic. The total size of QDs was dependent on both the time of silica shell growth in the presence of sodium silicate, and on the presence of ethanol during this growth. The size of particles was monitored during the first 72 h using two principally different methods: Dynamic Light Scattering (DLS), and Scanning Electron Microscopy (SEM). The data obtained by both methods were compared and reasons for differences discussed. Without ethanol precipitation, the silica shell thickness grew slowly and increased the nanoparticle total size from approximately 23 nm up to almost 30 nm (DLS data), and up to almost 60 nm (SEM data) in three days. During the same time period but in the presence of ethanol, the size of CdTe/SiO2 QDs increased more significantly: up to 115 nm (DLS data) and up to 83 nm (SEM data). The variances occurring between silica shell thicknesses caused by different methods of silica growth, as well as by different evaluation methods, were discussed.
ER  -

MODLITBOVÁ, Pavlína, Karel KLEPÁRNÍK, Zdeněk FARKA, Pavel POŘÍZKA, Petr SKLÁDAL, Karel NOVOTNÝ a Jozef KAISER. Time-Dependent Growth of Silica Shells on CdTe Quantum Dots. \textit{Nanomaterials}. Basel: MDPI, 2018, roč.~8, č.~6, s.~439-447. ISSN~2079-4991. Dostupné z: https://dx.doi.org/10.3390/nano8060439.

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