Aggregation-Free Process for Functional CdSe/CdS Core/Shell Quantum Dots
- Aggregation-Free Process for Functional CdSe/CdS Core/Shell Quantum Dots
- 문지형; 최규실; 김병주; 윤권하; 성태연; 우경자
- aggregation-free; quantum dot; hydrodynamic diameter; surface modification; internanoparticle hydrogen bonding; steric hindrance
- Issue Date
- The journal of physical chemistry. C, Nanomaterials and Interfaces.
- VOL 113, NO 17, 7114-7119
- 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.
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