Sharma, Himani and Sharma, Shailesh N. and Kumar, Umesh and Singh, V. N. and Mehta , B. R. and Singh, Gurmeet and Shivaprasad , S. M. and Kakkar , Rita (2008) Formation of water-soluble and biocompatible TOPO-capped CdSe quantum dots with efficient photoluminescence. Journal of Materials Science: Materials in Medicine , 20 (1). pp. 123-130. ISSN 1573-4838

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Abstract

In this work, polysorbate surfactants with same functional groups but with varying molecular masses (Tween-80, Tween-40 and Tween-20) in different concentrations (0.1% to 20% w/w) were used to study the effect of the length of the surfactant chain on the luminescence of the entrapped TOPO-capped CdSe nanocrystals. Various phospholipids with different functional headgroups such as ethylene glycol (-PEG) and amine (-NH2) were used to improve biocompatibility and provide sites for bioconjugation respectively. It is understood that that the hydrophobic ends of the surfactant binds with the water repelling groups of the cap layer, thus modifying the CdSe cap layer and making it soluble in aqueous media. It was observed that the PL emission intensity of CdSe increases with increase in concentration of Tween-series surfactant unlike in the case of thiol-coated CdSe nanoparticles. However, higher PL intensity was obtained in the case of stoichiometric CdSe with Tween-40 corresponding to 20% w/w. The efficient PL sustainability of water-soluble CdSe QD’s can be attributed to the simpler chain structure of Tween-40 surfactant resulting in better passivation of the micelle.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Springer Verlag.
Subjects:	Engineering Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	30 Aug 2012 09:22
Last Modified:	30 Aug 2012 09:22
URI:	http://npl.csircentral.net/id/eprint/510

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