The systematic study of the precursor ratio effect in the Cd-Zn-S quantum dot synthesis

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F20%3A39916514" target="_blank" >RIV/00216275:25310/20:39916514 - isvavai.cz</a>

Result on the web

<a href="https://pubs.rsc.org/en/content/articlelanding/2020/CE/D0CE00597E#!divAbstract" target="_blank" >https://pubs.rsc.org/en/content/articlelanding/2020/CE/D0CE00597E#!divAbstract</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d0ce00597e" target="_blank" >10.1039/d0ce00597e</a>

Result language

angličtina

Original language name

The systematic study of the precursor ratio effect in the Cd-Zn-S quantum dot synthesis

Original language description

Semiconductor quantum dots (QDs) have attracted great attention due to their unique optical and chemical properties. An increasing demand for size and shape uniformity of QDs, high quantum yield (QY) and photochemical stability can be resolved by synthetic methods. Here we report a study of the effect of the precursor ratios within the synthesis of a series of Cd-Zn-S QDs. Trisubstituted thiourea (N-phenylmorpholine-4-carbothioamide) as a new and environmentally friendly source of sulphur in the synthesis of Cd0.2Zn0.8S QDs (Cd, Zn : S molar ratios = 1 : 0.5; 1 : 1; 1 : 1.5; 1 : 2; 1 : 2.5) and CdxZn1-xS QDs (wherex= 0.1; 0.25; 0.5; 0.75; 0.9) has been investigated. It was determined that an increase in the molar ratio of trisubstituted thiourea to metals leads to the growth of QDs and as a consequence, to a small emission red shift in the visible region of the spectrum. However, no significant changes in the elemental ratio in the material were detected. It was found that with an excess of trisubstituted thiourea taken to the reaction, oleylamine (OAm) as a co-ligand replaces linoleic acid from the protective shell of the QDs. In the case of an increase of Cd content in the CdxZn1-xS QDs, a significant shift in the emission to the red region of the spectrum was observed with an increase in the size of the QDs while their shape was unchanged. Based on the XRD data, a gradual transition from a cubic to a hexagonal crystal structure was detected. The high quantum yield (70%), the narrow photoluminescence (PL) signal (FWHM &lt; 31 nm) and the size uniformity of the obtained nanomaterials are promising features for production of highly sensitive sensors and LEDs.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10402 - Inorganic and nuclear chemistry

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2020

Confidentiality

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

Name of the periodical

CrystEngComm

ISSN

1466-8033

e-ISSN

1466-8033

Volume of the periodical

22

Issue of the periodical within the volume

25

Country of publishing house

GB - UNITED KINGDOM

Number of pages

14

Pages from-to

4324-4337

UT code for WoS article

000543912100014

EID of the result in the Scopus database

2-s2.0-85089080072