Aggregation-free process for functional CdSe/CdS core/shell quantum dots

Jihyung Moon, Kyu Sil Choi, Byungjoo Kim, Kwon Ha Yoon, Tae Yeon Seong, Kyoungja Woo

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Particle aggregation is implicated in a preparation of water-soluble functional nanoparticles and there is currently great interest in aggregation-free and water-soluble nanoparticles with a specific functionality. In this report, we present the aggregation-free surface modification process that provides water-soluble and functional quantum dots below 10 nm in hydrodynamic diameter. Our strategy is based on the reasoning that particle aggregation occurs due to polychelating internanoparticle hydrogen bonding interactions through surface molecules when they are no longer ionized. Therefore, the very strategy is to interrupt internanoparticle hydrogen bonding interactions by placing long chain hydrocarbon pillars (mercaptoundecanoic acid) which are bonded to functional molecules (folic acid or polyethylene glycol derivative) at appropriate distances on the CdSe/CdS core/shell quantum dots (QDs). The remaining QD surface area is then replaced by short-chain hydrophilic molecules (mercaptopropionic acid) endowing water solubility. However, the internanoparticle hydrogen bonding interactions, thereby resulting in aggregation, are inhibited by the steric hindrance of the already present bulky functional molecules. The current process showed an applicable feasibility for superparamagnetic iron oxide nanoparticles, too.

Original languageEnglish
Pages (from-to)7114-7119
Number of pages6
JournalJournal of Physical Chemistry C
Volume113
Issue number17
DOIs
Publication statusPublished - 2009 Apr 30
Externally publishedYes

Fingerprint

Semiconductor quantum dots
Agglomeration
quantum dots
Hydrogen bonds
Molecules
nanoparticles
Water
water
molecules
Nanoparticles
hydrogen
folic acid
Acids
acids
iron oxides
surface reactions
glycols
polyethylenes
Hydrocarbons
Iron oxides

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Aggregation-free process for functional CdSe/CdS core/shell quantum dots. / Moon, Jihyung; Choi, Kyu Sil; Kim, Byungjoo; Yoon, Kwon Ha; Seong, Tae Yeon; Woo, Kyoungja.

In: Journal of Physical Chemistry C, Vol. 113, No. 17, 30.04.2009, p. 7114-7119.

Research output: Contribution to journalArticle

Moon, Jihyung ; Choi, Kyu Sil ; Kim, Byungjoo ; Yoon, Kwon Ha ; Seong, Tae Yeon ; Woo, Kyoungja. / Aggregation-free process for functional CdSe/CdS core/shell quantum dots. In: Journal of Physical Chemistry C. 2009 ; Vol. 113, No. 17. pp. 7114-7119.
@article{4b22834166a44251a29e95f90f1a6bfd,
title = "Aggregation-free process for functional CdSe/CdS core/shell quantum dots",
abstract = "Particle aggregation is implicated in a preparation of water-soluble functional nanoparticles and there is currently great interest in aggregation-free and water-soluble nanoparticles with a specific functionality. In this report, we present the aggregation-free surface modification process that provides water-soluble and functional quantum dots below 10 nm in hydrodynamic diameter. Our strategy is based on the reasoning that particle aggregation occurs due to polychelating internanoparticle hydrogen bonding interactions through surface molecules when they are no longer ionized. Therefore, the very strategy is to interrupt internanoparticle hydrogen bonding interactions by placing long chain hydrocarbon pillars (mercaptoundecanoic acid) which are bonded to functional molecules (folic acid or polyethylene glycol derivative) at appropriate distances on the CdSe/CdS core/shell quantum dots (QDs). The remaining QD surface area is then replaced by short-chain hydrophilic molecules (mercaptopropionic acid) endowing water solubility. However, the internanoparticle hydrogen bonding interactions, thereby resulting in aggregation, are inhibited by the steric hindrance of the already present bulky functional molecules. The current process showed an applicable feasibility for superparamagnetic iron oxide nanoparticles, too.",
author = "Jihyung Moon and Choi, {Kyu Sil} and Byungjoo Kim and Yoon, {Kwon Ha} and Seong, {Tae Yeon} and Kyoungja Woo",
year = "2009",
month = "4",
day = "30",
doi = "10.1021/jp900420j",
language = "English",
volume = "113",
pages = "7114--7119",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "17",

}

TY - JOUR

T1 - Aggregation-free process for functional CdSe/CdS core/shell quantum dots

AU - Moon, Jihyung

AU - Choi, Kyu Sil

AU - Kim, Byungjoo

AU - Yoon, Kwon Ha

AU - Seong, Tae Yeon

AU - Woo, Kyoungja

PY - 2009/4/30

Y1 - 2009/4/30

N2 - Particle aggregation is implicated in a preparation of water-soluble functional nanoparticles and there is currently great interest in aggregation-free and water-soluble nanoparticles with a specific functionality. In this report, we present the aggregation-free surface modification process that provides water-soluble and functional quantum dots below 10 nm in hydrodynamic diameter. Our strategy is based on the reasoning that particle aggregation occurs due to polychelating internanoparticle hydrogen bonding interactions through surface molecules when they are no longer ionized. Therefore, the very strategy is to interrupt internanoparticle hydrogen bonding interactions by placing long chain hydrocarbon pillars (mercaptoundecanoic acid) which are bonded to functional molecules (folic acid or polyethylene glycol derivative) at appropriate distances on the CdSe/CdS core/shell quantum dots (QDs). The remaining QD surface area is then replaced by short-chain hydrophilic molecules (mercaptopropionic acid) endowing water solubility. However, the internanoparticle hydrogen bonding interactions, thereby resulting in aggregation, are inhibited by the steric hindrance of the already present bulky functional molecules. The current process showed an applicable feasibility for superparamagnetic iron oxide nanoparticles, too.

AB - Particle aggregation is implicated in a preparation of water-soluble functional nanoparticles and there is currently great interest in aggregation-free and water-soluble nanoparticles with a specific functionality. In this report, we present the aggregation-free surface modification process that provides water-soluble and functional quantum dots below 10 nm in hydrodynamic diameter. Our strategy is based on the reasoning that particle aggregation occurs due to polychelating internanoparticle hydrogen bonding interactions through surface molecules when they are no longer ionized. Therefore, the very strategy is to interrupt internanoparticle hydrogen bonding interactions by placing long chain hydrocarbon pillars (mercaptoundecanoic acid) which are bonded to functional molecules (folic acid or polyethylene glycol derivative) at appropriate distances on the CdSe/CdS core/shell quantum dots (QDs). The remaining QD surface area is then replaced by short-chain hydrophilic molecules (mercaptopropionic acid) endowing water solubility. However, the internanoparticle hydrogen bonding interactions, thereby resulting in aggregation, are inhibited by the steric hindrance of the already present bulky functional molecules. The current process showed an applicable feasibility for superparamagnetic iron oxide nanoparticles, too.

UR - http://www.scopus.com/inward/record.url?scp=67049088207&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=67049088207&partnerID=8YFLogxK

U2 - 10.1021/jp900420j

DO - 10.1021/jp900420j

M3 - Article

AN - SCOPUS:67049088207

VL - 113

SP - 7114

EP - 7119

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 17

ER -