Joshi, Prachi and Ansari, Z. A and Singh, Surinder P. and Shanker, Virendra (2009) Synthesis and Characterization of Highly Fluorescent Water Dispersible ZnO Quantum Dots. Advanced Science Letters , 2 (3). pp. 360-363. ISSN 1936-7317

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Abstract

We report the synthesis of stable and water dispersible fluorescent zinc oxide (ZnO) quantum dots (QDs). Hydrophilic polyethyleneimine (PEI) was used to stabilize QDs in water and trisodiumcitrate was used as linker between ZnO and PEI. X-ray diffraction reveals the nanocrystalline nature and hexagonal wurtzite structure of as synthesized ZnO QDs. High-resolution transmission electron micrograph suggests nearly spherical particles of size 3-6 nm and lattice spacing of 0.28 nm corresponding to the (100) plane of zinc oxide. Water dispersed ZnO QDs exhibit efficient yellow-green fluorescence centered at 555 nm (2.23 eV) with an excitation wavelength of 360 nm, which is found to be stable for two month revealing the high stability of QDs in water.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s American Scientific Publishers.
Subjects:	Chemistry Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	16 Oct 2012 12:21
Last Modified:	16 Oct 2012 12:21
URI:	http://npl.csircentral.net/id/eprint/704

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