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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Inorganically coated colloidal quantum dots in polar solvents using a microemulsion-assisted method
AU - Acebron, Maria
AU - Herrera, Facundo C.
AU - Mizrahi, Martin
AU - Navio, Cristina
AU - Bernardo-Gavito, Ramon
AU - Granados, Daniel
AU - Requejo, Felix G.
AU - Juarez, Beatriz H.
N1 - © Royal Society of Chemistry 2017
PY - 2017/1/21
Y1 - 2017/1/21
N2 - The dielectric nature of organic ligands capping semiconductor colloidal nanocrystals (NCs) makes them incompatible with optoelectronic applications. For this reason, these ligands are regularly substituted through ligand-exchange processes by shorter (even atomic) or inorganic ones. In this work, an alternative path is proposed to obtain inorganically coated NCs. Differently to regular ligand exchange processes, the method reported here produces core-shell NCs and the removal of the original organic shell in a single step. This procedure leads to the formation of connected NCs resembling 1D worm-like networks with improved optical properties and polar solubility, in comparison with the initial CdSe NCs. The nature of the inorganic shell has been elucidated by X-ray Absorption Near Edge Structure (XANES), Extended X-ray Absorption Fine Structure (EXAFS) and X-ray Photoelectron Spectroscopy (XPS). The 1D morphology along with the lack of long insulating organic ligands and the higher solubility in polar media turns these structures very attractive for their further integration into optoelectronic devices.
AB - The dielectric nature of organic ligands capping semiconductor colloidal nanocrystals (NCs) makes them incompatible with optoelectronic applications. For this reason, these ligands are regularly substituted through ligand-exchange processes by shorter (even atomic) or inorganic ones. In this work, an alternative path is proposed to obtain inorganically coated NCs. Differently to regular ligand exchange processes, the method reported here produces core-shell NCs and the removal of the original organic shell in a single step. This procedure leads to the formation of connected NCs resembling 1D worm-like networks with improved optical properties and polar solubility, in comparison with the initial CdSe NCs. The nature of the inorganic shell has been elucidated by X-ray Absorption Near Edge Structure (XANES), Extended X-ray Absorption Fine Structure (EXAFS) and X-ray Photoelectron Spectroscopy (XPS). The 1D morphology along with the lack of long insulating organic ligands and the higher solubility in polar media turns these structures very attractive for their further integration into optoelectronic devices.
KW - TRIANGULAR CDS NANOCRYSTALS
KW - SULFIDE THIN-FILMS
KW - SURFACE LIGANDS
KW - PROSPECTS
KW - STATE
KW - PASSIVATION
KW - ADSORPTION
KW - MORPHOLOGY
KW - STABILITY
KW - MECHANISM
U2 - 10.1039/c6cp06982g
DO - 10.1039/c6cp06982g
M3 - Journal article
VL - 19
SP - 1999
EP - 2007
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 3
ER -