UV Tuning of Cadmium Telluride Quantum Dots (CdTe QDs) - Assessed by Spectroscopy and Electrochemistry

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43210%2F16%3A43909578" target="_blank" >RIV/62156489:43210/16:43909578 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26620/16:PU120388

Výsledek na webu

<a href="http://www.electrochemsci.org/papers/vol11/110100175.pdf" target="_blank" >http://www.electrochemsci.org/papers/vol11/110100175.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

UV Tuning of Cadmium Telluride Quantum Dots (CdTe QDs) - Assessed by Spectroscopy and Electrochemistry

Popis výsledku v původním jazyce

In this work, the electrochemical analysis (potentiometric stripping analysis - PSA, cyclic voltammetry - CV) and evaluation of fluorescence properties of cadmium telluride quantum dots (CdTe QDs) covered by mercaptosuccinic acid (MSA) were performed. Using CV it was found that average value of Delta E of QDs is lower than 0.059 V and I is in direct correlation with square root of scan rates, therefore it can be assumed that this system represents rather reversible than quasi-reversible process. Further, it was found that nearly 1.4 electrons are exchanged in both cases, which corresponded with expected two-electron transfer. Fluorescence analysis showed that UV radiation (254 and 312 nm) significantly changes fluorescence properties of CdTe QDs in time 0 - 60 min. It was found that after 5 min of UV irradiation (lambda = 312 nm) the fluorescence intensity increased by 37% and at lambda = 254 nm the increase in fluorescence intensity was even higher, by 45% (compared to the control without irradiation). UV radiation also caused a shift in the emission maximum of CdTe QDs in range 2 - 70 nm. This work opens up new ways for tuning the optical properties of QDs.

Název v anglickém jazyce

UV Tuning of Cadmium Telluride Quantum Dots (CdTe QDs) - Assessed by Spectroscopy and Electrochemistry

Popis výsledku anglicky

In this work, the electrochemical analysis (potentiometric stripping analysis - PSA, cyclic voltammetry - CV) and evaluation of fluorescence properties of cadmium telluride quantum dots (CdTe QDs) covered by mercaptosuccinic acid (MSA) were performed. Using CV it was found that average value of Delta E of QDs is lower than 0.059 V and I is in direct correlation with square root of scan rates, therefore it can be assumed that this system represents rather reversible than quasi-reversible process. Further, it was found that nearly 1.4 electrons are exchanged in both cases, which corresponded with expected two-electron transfer. Fluorescence analysis showed that UV radiation (254 and 312 nm) significantly changes fluorescence properties of CdTe QDs in time 0 - 60 min. It was found that after 5 min of UV irradiation (lambda = 312 nm) the fluorescence intensity increased by 37% and at lambda = 254 nm the increase in fluorescence intensity was even higher, by 45% (compared to the control without irradiation). UV radiation also caused a shift in the emission maximum of CdTe QDs in range 2 - 70 nm. This work opens up new ways for tuning the optical properties of QDs.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CB - Analytická chemie, separace

OECD FORD obor

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Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

International Journal of Electrochemical Science

ISSN

1452-3981

e-ISSN

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Svazek periodika

11

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

CS - Srbsko a Černá Hora

Počet stran výsledku

14

Strana od-do

175-188

Kód UT WoS článku

000371089300015

EID výsledku v databázi Scopus

2-s2.0-85016326616