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.

Basic information

Original name

Time-Dependent Growth of Silica Shells on CdTe Quantum Dots

Authors

MODLITBOVÁ, Pavlína (203 Czech Republic), Karel KLEPÁRNÍK (203 Czech Republic), Zdeněk FARKA (203 Czech Republic, belonging to the institution), Pavel POŘÍZKA (203 Czech Republic), Petr SKLÁDAL (203 Czech Republic, guarantor, belonging to the institution), Karel NOVOTNÝ (203 Czech Republic, belonging to the institution) and Jozef KAISER (203 Czech Republic)

Edition

Nanomaterials, Basel, MDPI, 2018, 2079-4991

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10406 Analytical chemistry

Country of publisher

Switzerland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 4.034

RIV identification code

RIV/00216224:14740/18:00103164

Organization unit

Central European Institute of Technology

DOI

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

UT WoS

000436505200084

Keywords in English

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

Abstract

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.

Links

LM2015043, research and development project

Name: Česká infrastruktura pro integrativní strukturní biologii (Acronym: CIISB)

Investor: Ministry of Education, Youth and Sports of the CR

LQ1601, research and development project

Name: CEITEC 2020 (Acronym: CEITEC2020)

Investor: Ministry of Education, Youth and Sports of the CR

Citovat

MODLITBOVÁ, Pavlína, Karel KLEPÁRNÍK, Zdeněk FARKA, Pavel POŘÍZKA, Petr SKLÁDAL, Karel NOVOTNÝ and Jozef KAISER. Time-Dependent Growth of Silica Shells on CdTe Quantum Dots. Nanomaterials. Basel: MDPI, 2018, vol. 8, No 6, p. 439-447. ISSN 2079-4991. Available from: 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 and Jozef KAISER. Time-Dependent Growth of Silica Shells on CdTe Quantum Dots. \textit{Nanomaterials}. Basel: MDPI, 2018, vol.~8, No~6, p.~439-447. ISSN~2079-4991. Available from: https://dx.doi.org/10.3390/nano8060439.

Detailed Information on Publication Record