fulltext.study @t Gmail

Synthesis and photophysics of colloidal ZnS/PbS/ZnS nanocomposites—An analysis of dynamics of charge carriers

Paper ID Volume ID Publish Year Pages File Format Full-Text
27828 44044 2009 8 PDF Available
Title
Synthesis and photophysics of colloidal ZnS/PbS/ZnS nanocomposites—An analysis of dynamics of charge carriers
Abstract

The deposition of Q-ZnS layer as shell at the interface of Q-ZnS/PbS produces ZnS/PbS/ZnS nanocomposite. The electronic properties of the nanocomposite have been examined as a function of thickness of ZnS shell and in the presence of excess [Zn2+]. The monolayer of ZnS shell red shifts the onset of absorption of precursor ZnS/PbS accompanied with an increase in absorption coefficient in the wavelength range of 200–600 nm having an excitonic absorption at 280 nm. These particles display relatively intense blue-shifted 505 nm (2.45 eV) emission associated with a tremendous enhancement of fluorescence lifetime to 150 ns from 5.5 ns, observed for precursor ZnS/PbS. The addition of Zn2+ further improves the charge separation in this system. These electronic changes are understood by the distribution of traps of varied energy (160–365 meV) at the interface and confinement of e−–h+ on the entire heterostructure.

Keywords
Photophysics; Fluorescence; Time-resolved emission; Nanocomposite; Semiconductor; Colloid
First Page Preview
Synthesis and photophysics of colloidal ZnS/PbS/ZnS nanocomposites—An analysis of dynamics of charge carriers
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 208, Issues 2–3, 15 December 2009, Pages 195–202
Authors
, , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us