Synthesis and properties of ZnTe and ZnTe/ZnS core/shell semiconductor nanocrystals

2014
journal article
article
41
cris.lastimport.wos2024-04-09T20:07:50Z
dc.abstract.enWe report the synthesis of spherical ZnTe nanocrystals and the successive coating with a ZnS shell to afford core/shell quantum dots. These nanocrystals can represent alternatives to cadmium-based quantum dots but their preparation and properties are challenging and relatively unexplored. The effect of various synthetic parameters on the reaction outcome was investigated, and the resulting nanocrystals were characterized by TEM, EDX, XPS, and spectroscopic measurements. The optical data indicate that these core/shell quantum dots belong to type I, i.e., both the electron and the hole are confined within the ZnTe core. Both the ZnTe core and ZnTe/ZnS core/shell quantum dot samples absorb in the visible region and are not luminescent. The ZnS shell preserves the optical properties of the core and improves the chemical and photochemical stability of the nanoparticles in air equilibrated solution, whereas they appear to be quite fragile in the solid state. XPS results have evidenced the distinct nature of core and core/shell QDs, confirming the formation of QDs with shells of different thicknesses and their evolution due to oxidation upon air exposure. Anodic photocurrent generation was observed when an ITO electrode functionalized with ZnTe/ZnS nanocrystals was irradiated in the visible region in a photoelectrochemical cell, indicating that the quantum dots perform spectral sensitization of the electron injection into the ITO electrode. Conversely, cathodic photocurrent generation was not observed; hence, the QD-modified electrode performs electrical rectification under a photon energy inputpl
dc.affiliationWydział Chemii : Zakład Chemii Nieorganicznejpl
dc.contributor.authorLincheneau, Christophepl
dc.contributor.authorAmelia, Matteopl
dc.contributor.authorOszajca, Marek - 126152 pl
dc.contributor.authorBoccia, Alicepl
dc.contributor.authorD’Orazi, Fabiopl
dc.contributor.authorMadrigale, Mattiapl
dc.contributor.authorZanoni, Robertinopl
dc.contributor.authorMazzaro, Raffaellopl
dc.contributor.authorOrtolani, Lucapl
dc.contributor.authorMorandi, Vittoriopl
dc.contributor.authorSilvi, Serenapl
dc.contributor.authorSzaciłowski, Konrad - 132185 pl
dc.contributor.authorCredi, Albertopl
dc.date.accession2019-02-13pl
dc.date.accessioned2015-07-28T09:04:14Z
dc.date.available2015-07-28T09:04:14Z
dc.date.issued2014pl
dc.date.openaccess0
dc.description.accesstimew momencie opublikowania
dc.description.admin[AU] Szaciłowski, Konrad [SAP11115985]pl
dc.description.number16pl
dc.description.physical2877-2886pl
dc.description.publication1,1pl
dc.description.versionostateczna wersja wydawcy
dc.description.volume2pl
dc.identifier.doi10.1039/c3tc32385dpl
dc.identifier.eissn2050-7534pl
dc.identifier.issn2050-7526pl
dc.identifier.projectROD UJ / Ppl
dc.identifier.urihttp://ruj.uj.edu.pl/xmlui/handle/item/14120
dc.identifier.weblinkhttps://pubs.rsc.org/en/content/articlepdf/2014/tc/c3tc32385dpl
dc.languageengpl
dc.language.containerengpl
dc.rightsUdzielam licencji. Uznanie autorstwa - Użycie niekomercyjne 3.0*
dc.rights.licenceCC-BY-NC
dc.rights.urihttp://creativecommons.org/licenses/by-nc/3.0/legalcode*
dc.share.typeinne
dc.subtypeArticlepl
dc.titleSynthesis and properties of ZnTe and ZnTe/ZnS core/shell semiconductor nanocrystalspl
dc.title.journalJournal of Materials Chemistry. Cpl
dc.typeJournalArticlepl
dspace.entity.typePublication
cris.lastimport.wos
2024-04-09T20:07:50Z
dc.abstract.enpl
We report the synthesis of spherical ZnTe nanocrystals and the successive coating with a ZnS shell to afford core/shell quantum dots. These nanocrystals can represent alternatives to cadmium-based quantum dots but their preparation and properties are challenging and relatively unexplored. The effect of various synthetic parameters on the reaction outcome was investigated, and the resulting nanocrystals were characterized by TEM, EDX, XPS, and spectroscopic measurements. The optical data indicate that these core/shell quantum dots belong to type I, i.e., both the electron and the hole are confined within the ZnTe core. Both the ZnTe core and ZnTe/ZnS core/shell quantum dot samples absorb in the visible region and are not luminescent. The ZnS shell preserves the optical properties of the core and improves the chemical and photochemical stability of the nanoparticles in air equilibrated solution, whereas they appear to be quite fragile in the solid state. XPS results have evidenced the distinct nature of core and core/shell QDs, confirming the formation of QDs with shells of different thicknesses and their evolution due to oxidation upon air exposure. Anodic photocurrent generation was observed when an ITO electrode functionalized with ZnTe/ZnS nanocrystals was irradiated in the visible region in a photoelectrochemical cell, indicating that the quantum dots perform spectral sensitization of the electron injection into the ITO electrode. Conversely, cathodic photocurrent generation was not observed; hence, the QD-modified electrode performs electrical rectification under a photon energy input
dc.affiliationpl
Wydział Chemii : Zakład Chemii Nieorganicznej
dc.contributor.authorpl
Lincheneau, Christophe
dc.contributor.authorpl
Amelia, Matteo
dc.contributor.authorpl
Oszajca, Marek - 126152
dc.contributor.authorpl
Boccia, Alice
dc.contributor.authorpl
D’Orazi, Fabio
dc.contributor.authorpl
Madrigale, Mattia
dc.contributor.authorpl
Zanoni, Robertino
dc.contributor.authorpl
Mazzaro, Raffaello
dc.contributor.authorpl
Ortolani, Luca
dc.contributor.authorpl
Morandi, Vittorio
dc.contributor.authorpl
Silvi, Serena
dc.contributor.authorpl
Szaciłowski, Konrad - 132185
dc.contributor.authorpl
Credi, Alberto
dc.date.accessionpl
2019-02-13
dc.date.accessioned
2015-07-28T09:04:14Z
dc.date.available
2015-07-28T09:04:14Z
dc.date.issuedpl
2014
dc.date.openaccess
0
dc.description.accesstime
w momencie opublikowania
dc.description.adminpl
[AU] Szaciłowski, Konrad [SAP11115985]
dc.description.numberpl
16
dc.description.physicalpl
2877-2886
dc.description.publicationpl
1,1
dc.description.version
ostateczna wersja wydawcy
dc.description.volumepl
2
dc.identifier.doipl
10.1039/c3tc32385d
dc.identifier.eissnpl
2050-7534
dc.identifier.issnpl
2050-7526
dc.identifier.projectpl
ROD UJ / P
dc.identifier.uri
http://ruj.uj.edu.pl/xmlui/handle/item/14120
dc.identifier.weblinkpl
https://pubs.rsc.org/en/content/articlepdf/2014/tc/c3tc32385d
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights*
Udzielam licencji. Uznanie autorstwa - Użycie niekomercyjne 3.0
dc.rights.licence
CC-BY-NC
dc.rights.uri*
http://creativecommons.org/licenses/by-nc/3.0/legalcode
dc.share.type
inne
dc.subtypepl
Article
dc.titlepl
Synthesis and properties of ZnTe and ZnTe/ZnS core/shell semiconductor nanocrystals
dc.title.journalpl
Journal of Materials Chemistry. C
dc.typepl
JournalArticle
dspace.entity.type
Publication
Affiliations

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