Blue-UV-Emitting ZnSe(Dot)/ZnS(Rod) core/shell nanocrystals prepared from CdSe/CdS nanocrystals by sequential cation exchange (Articolo in rivista)

Type
Label
  • Blue-UV-Emitting ZnSe(Dot)/ZnS(Rod) core/shell nanocrystals prepared from CdSe/CdS nanocrystals by sequential cation exchange (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/nn204601n (literal)
Alternative label
  • Hongbo Li, Rosaria Brescia, Roman Krahne, Giovanni Bertoni, Marcelo J. P. Alcocer, Cosimo D'Andrea, Francesco Scotognella, Francesco Tassone, Marco Zanella, Milena De Giorgi, Liberato Manna (2012)
    Blue-UV-Emitting ZnSe(Dot)/ZnS(Rod) core/shell nanocrystals prepared from CdSe/CdS nanocrystals by sequential cation exchange
    in ACS nano; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Hongbo Li, Rosaria Brescia, Roman Krahne, Giovanni Bertoni, Marcelo J. P. Alcocer, Cosimo D'Andrea, Francesco Scotognella, Francesco Tassone, Marco Zanella, Milena De Giorgi, Liberato Manna (literal)
Pagina inizio
  • 1637 (literal)
Pagina fine
  • 1647 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://pubs.acs.org/doi/abs/10.1021/nn204601n (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 6 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 11 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 2 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy; IMEM-CNR, Parco Area delle Scienze 37/A, 43124 Parma, Italy; CNST of IIT@polimi, Via Pascoli 70/3, 20133 Milano, Italy; Department of Physics, Politecnico di Milano, Piazza L. Da Vinci 32, 20133 Milano, Italy; National Nanotechnology Laboratory of CNR-NANO, via per Arnesano km 5, 73100 Lecce, Italy (literal)
Titolo
  • Blue-UV-Emitting ZnSe(Dot)/ZnS(Rod) core/shell nanocrystals prepared from CdSe/CdS nanocrystals by sequential cation exchange (literal)
Abstract
  • Great control over size, shape and optical properties is now possible in colloidal Cd-based nanocrystals, which has paved the way for many fundamental studies and applications. One popular example of such class of nanocrystals is represented by CdSe(spherical core)/CdS(rod shell) nanorods. These can be nearly monodisperse in size and shape and have strong and stable photoluminescence that is tunable in the visible range (mainly by varying the size of the CdSe core). The corresponding Zn-based core/shell nanorods would be good candidates for tunable emission in the blue-UV region. However, while the synthesis of ZnS nanocrystals with elongated shapes has been demonstrated based on the oriented-attachment mechanism, elongated ZnS shells are difficult to fabricate because the more common cubic phase of ZnS has a highly symmetric crystal structure. We report here a procedure based on a sequence of two cation exchange reactions, namely, Cd2+>Cu+ and then Cu+>Zn2+, by which we transform colloidal CdSe(core)/CdS(shell) nanorods first into into Cu 2Se/Cu 2S nanorods, which are then converted into blue-UV fluorescent ZnSe(core)/ ZnS(shell) nanorods. The procedure transfers the morphological and structural information of the initial Cd-based nanorods to the Zn-based nanorods. Therefore, the final nanoparticles are made by a ZnSe dot embedded in a rod-shaped shell of wurtzite ZnS. Since in the starting Cd-based nanorods the size of the CdSe core and the length of the CdS shell can be well controlled, the same holds for the final Zn-based rods. In the second step of the exchange reaction (Cu+>Zn2+), a large excess of Zn2+ ions added over the Cu+ ions present in the Cu2Se/Cu2S nanorods is the key requisite to obtain bright, band-edge emission (with quantum yields approaching 15%) with narrow line widths (approaching 75 meV). In these ZnSe/ZnS nanorods, photogenerated carriers appear to be more confined in the core region compared to their parent CdSe/CdS nanorods. (literal)
Editore
Prodotto di
Autore CNR
Insieme di parole chiave

Incoming links:


Prodotto
Autore CNR di
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi
Editore di
Insieme di parole chiave di
data.CNR.it