NDLI: Synthesis of hydrophobically-modified poly ( ethyleneimine ) as surfactant for cationic CdSe / ZnS quantum dots with high colloidal stability

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Synthesis of hydrophobically-modified poly ( ethyleneimine ) as surfactant for cationic CdSe / ZnS quantum dots with high colloidal stability

Content Provider	Semantic Scholar
Author	Yangcharoenyuenyong, Jamornpan Vilaivan, Tirayut Insin, Numpon
Copyright Year	2017
Abstract	Semiconductor nanoparticles or quantum dots (QDs), especially CdSe/ZnS, are of interest as bio-sensors due to their unique size-dependent optical properties and photostability. To apply QDs in biological applications, the surface of QDs must be modified to become charged or hydrophilic. Poly(ethyleneimine) or PEI has been used in the modification of various nanoparticles to create water-dispersible cationic nanoparticles. However, the colloidal stability of the modified nanoparticles was limited. In this study, we prepared a more stable colloidal cationic PEI-QDs using a micelle formation process. To induce the micellar structure, PEI was partially acylated with octanoic acid (Oct) via EDC/NHS coupling to introduce some hydrophobicity and coated onto QDs surface via micelle formation in chloroform/DI water. The Oct-PEI/QDs were characterized using UVvis and fluorescent spectroscopy to confirm that the optical properties were not affected by the modification process. TEM images revealed that the Oct-PEI/QDs exhibited less aggregation than PEI/QDs, and the stability of Oct-PEI/QDs was increased from few hours to more than a week. Moreover, the zeta-potential of the Oct-PEI/QDs is 16.3 mV, which is lower than other PEI/nanoparticles reported (18-30 mV) due to acylation of PEI, and the resulted QDs are expected to exhibit lower cytotoxicity for their less positive charges.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.paccon2018.com/published_abstract_download.php?id=MN_O_007&ses=MN
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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