UV-induced transformation and physicochemical property changes of quantum dots in the presence of air

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DOIResolve DOI: http://doi.org/10.1007/s11051-014-2435-x
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TypeArticle
Journal titleJournal of Nanoparticle Research
ISSN1388-0764
Volume16
Issue6
Article number2435
SubjectColloidal quantum dots; UV irradiation; Water-soluble products; DNA interaction potency; Surface chemical reactivity; Transformation of nanomaterials; Environmental effects
AbstractEngineered nanomaterials (ENMs) can be released to the environment during their lifecycles. The potential uptake by biological systems, along with uncertain distribution pathways, makes this class of materials important to study from a perspective of potential impacts to the environment and people. In this study, colloidal quantum dots (Q-dots), with diameter around 3 nm and passivated with C18H33 chains (oleic acid), were used, as a model system, to investigate the fate and the transformations of ENMs under UV irradiation in the presence of air. Before and after the UV light irradiation, the changes of the Q-dots on DNA interaction potency, and UV-Vis and fluorescence spectra are compared. When the Q-dots were exposed to UV light, the formation of water-soluble products was confirmed by UV-Vis and fluorescence spectra collected from aqueous dispersions and by the mass loss. Both the UV irradiation time and intensity were found to influence the amount of water-soluble products produced. However, before and after UV irradiation, the Q-dots exhibited little change of their DNA interaction potency. Therefore, it seems that the Q-dot surface chemical reactivity to DNA changed little, in conjunction with photooxidization of the surface passivation ligand.
Publication date
PublisherSpringer International Publishing
LanguageEnglish
AffiliationNational Research Council Canada; Information and Communication Technologies; Security and Disruptive Technologies
Peer reviewedYes
NPARC number21272636
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Record identifiercdb7be45-da33-4f2f-bfec-f920250ace84
Record created2014-12-03
Record modified2017-03-23
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