Comparative study on coating CdSe nanocrystals with surfactants

Sławomir Oszwałdowski , K. P. Roberts

Abstract

We have synthesized CdSe nanocrystals (NCs) in sizes from 2.2 to 5.1 nm passivated with hydrophobic trioctylphosphine oxide (TOPO) in combination trioctylphosphine (TOP) or tributylphosphine (TBP) to obtain particles of the type CdSe/TOPO/TOP or CdSe/TOPO/TBP. These NCs were then dispersed in aqueous solution of ionic or non-ionic surfactants (such as stearate, oleic acid, Tween) using a biphase (water and chloroform or hexane) transfer method. It is found that both the structure of the surfactant and the native surface of the ligand govern the coating of the NCs with surfactants. More specifically, the hydrophobicity-hydrophilicity balance of the surfactant regulates the coating efficacy, thereby transferring the NC from the organic to the aqueous phase. The type of ligand on the NCs and the kind of coating surfactant also affect photoluminescence (PL). The ratio of PL and absorbance unit (defined as PL per 0.1 AU) was implemented as a tool to monitor changes in PL intensity and wavelength as a function of size, coatings and surface defects. Finally, the distribution of CdSe nanocrystals between pseudophases in cloud point extraction was discussed based on experimental results. It was concluded that the size of CdSe nanocrystal present in an appropriate pseudophase is correlated with the way in which the non-ionic surfactant coats CdSe nanocrystals.
Author Sławomir Oszwałdowski (FC / CAC)
Sławomir Oszwałdowski,,
- Chair Of Analytical Chemistry
, K. P. Roberts - [University of Tulsa]
K. P. Roberts,,
-
-
Journal seriesMicrochimica Acta, ISSN 0026-3672, [1436-5073]
Issue year2013
Vol180
No13
Pages1341-1350
Publication size in sheets0.5
Keywords in EnglishSemiconductor nanocrystals, Surfactants, Dispersion, Optical spectra, Cloud-point extraction
ASJC Classification1602 Analytical Chemistry
DOIDOI:10.1007/s00604-013-1062-z
URL http://link.springer.com/article/10.1007%2Fs00604-013-1062-z
Languageen angielski
File
wdpb_publikacje_pliki_plik_publikacja_1946_org.pdf 576.11 KB
Score (nominal)40
Score sourcejournalList
ScoreMinisterial score = 30.0, 02-02-2020, ArticleFromJournal
Ministerial score (2013-2016) = 40.0, 02-02-2020, ArticleFromJournal
Publication indicators Scopus Citations = 4; WoS Citations = 4; Scopus SNIP (Source Normalised Impact per Paper): 2014 = 1.035; WoS Impact Factor: 2013 = 3.719 (2) - 2013=3.118 (5)
Citation count*4 (2016-05-30)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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