Journal
ACS NANO
Volume 6, Issue 6, Pages 4973-4983Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn300517k
Keywords
disaggregation; F- ions; quantum dots; hydrogen bonding; nonspecific adsorption
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Funding
- National Natural Science Foundation of China [90606003, 21190041, 21190044, 21175035]
- National Basic Research Program [2011CB911002]
- International Science & Technology Cooperation Program of China [2010DFB30300]
- Program for New Century Excellent Talents in University [NCET-09-0338]
- Hunan Provincial Natural Science Foundation of China [10JJ7002]
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Nanoparticle stabilization against detrimental aggregation is a critical parameter that needs to be well controlled. Herein, we present a facile and rapid ion-mediated dispersing technique that leads to hydrophilic aggregate-free quantum dots (QDs). Because of the shielding of the hydrogen bonds between cysteamine-capped QDs, the presence of F- ions disassembled the aggregates of QDs and afforded their high colloidal stability. The F- ions also greatly eliminated the nonspecific adsorption of the QDs on glass slides and cells. Unlike the conventional colloidal stabilized method that requires the use of any organic ligand and/or polymer for the passivation of the nanoparticle surface, the proposed approach adopts the small size and large diffusion coefficient of inorganic ions as dispersant, which offers the disaggregation a fast reaction dynamics and negligible influence on their intrinsic surface functional properties. Therefore, the ion-mediated dispersing strategy showed great potential in chemosensing and biomedical applications.
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