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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 12 — Dec. 1, 2007
  • pp: 3064–3071

Synthesis and optical spectroscopy of a hybrid cadmium sulfide–dendrimer nanocomposite

S. K. Gayen, M. Brito, B. B. Das, G. Comanescu, X. C. Liang, M. Alrubaiee, R. R. Alfano, C. Gonzalez, A. H. Byro, D. L. V. Bauer, and V. Balogh-Nair  »View Author Affiliations


JOSA B, Vol. 24, Issue 12, pp. 3064-3071 (2007)
http://dx.doi.org/10.1364/JOSAB.24.003064


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Abstract

Hybrid nanocomposites of cadmium sulfide ( CdS ) quantum dots and poly(propyleneimine) dendrimer having a 1,4-diaminobutane core have been produced by colloidal synthesis in degassed methanol at room temperature using third-, fourth-, and fifth-generation (G5.0) dendrimers, and their spectroscopic properties have been investigated. The nanoparticles fluoresced from 375 to 650 nm under near-ultraviolet excitation, and their absorption spectra exhibited a strong blueshift of the band edge compared to that of the bulk CdS . The stability of nanocomposites depended significantly, while the size and spectroscopic properties exhibited a weaker dependence, on the dendrimer generation. Most compact and stable nanoparticles were obtained with G5.0 dendrimers. Average diameter was estimated to be 2.2 ± 0.3 nm , assuming nanoparticles of spherical shape within an infinite well potential. The room-temperature luminescence has a fast component with 165 ± 5 ps lifetime and a slow component with a 40 ± 2 ns lifetime. The luminescence is partially polarized with an initial anisotropy of 0.39 ± 0.02 .

© 2007 Optical Society of America

OCIS Codes
(160.4670) Materials : Optical materials
(160.5470) Materials : Polymers
(300.1030) Spectroscopy : Absorption
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
(300.6530) Spectroscopy : Spectroscopy, ultrafast
(160.4236) Materials : Nanomaterials

ToC Category:
Spectroscopy

History
Original Manuscript: August 16, 2007
Revised Manuscript: October 19, 2007
Manuscript Accepted: October 23, 2007
Published: November 30, 2007

Virtual Issues
Vol. 3, Iss. 1 Virtual Journal for Biomedical Optics

Citation
S. K. Gayen, M. Brito, B. B. Das, G. Comanescu, X. C. Liang, M. Alrubaiee, R. R. Alfano, C. Gonzalez, A. H. Byro, D. L. V. Bauer, and V. Balogh-Nair, "Synthesis and optical spectroscopy of a hybrid cadmium sulfide-dendrimer nanocomposite," J. Opt. Soc. Am. B 24, 3064-3071 (2007)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-24-12-3064

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