Issue 20, 2005
From the journal:

Journal of Materials Chemistry

Quasi-reversible photoluminescence quenching of stable dispersions of silicon nanoparticles

William D. Kirkey,ab   Yudhisthira Sahoo,ac   Xuegeng Li,ad   Yuanqing He,ad   Mark T. Swihart,ad   Alexander N. Cartwright,ab   Stanley Bruckensteinc  and  Paras N. Prasad*abc  

* Corresponding authors

a Institute for Lasers, Photonics, and Biophotonics, The University at Buffalo (SUNY), Buffalo, NY 14260
E-mail: pnprasad@buffalo.edu

b Department of Electrical Engineering, The University at Buffalo (SUNY), Buffalo, NY 14260

c Department of Chemistry, The University at Buffalo (SUNY), Buffalo, NY 14260

d Department of Chemical and Biological Engineering, The University at Buffalo (SUNY), Buffalo, NY 14260

Abstract

Optically clear and stable dispersions of brightly photoluminescent Si nanoparticles were obtained by covalent attachment of alkenoic compounds to the particles. Quenching of photoluminescence by ethylamine, diethylamine, triethylamine, pyrazine, and piperazine was investigated. The photoluminescence was quenched by the action of these nitrogenous species, but in some cases could be partially restored by the addition of trifluoroacetic acid. The extent of restoration of photoluminescence, after equilibrium is reached, was independent of the sequence of addition of the amine and the acid. The photoluminescence quenching and recovery are influenced by a combination of basicity, polarity, and steric factors of the quencher molecules. The quenching and subsequent restoration occurs gradually at room temperature and it takes several minutes to reach equilibrium.

Graphical abstract: Quasi-reversible photoluminescence quenching of stable dispersions of silicon nanoparticles

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Article information

DOI
https://doi.org/10.1039/B417648K
Article type
Paper
Submitted
22 Nov 2004
Accepted
04 Mar 2005
First published
15 Apr 2005

J. Mater. Chem., 2005,15, 2028-2034

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Quasi-reversible photoluminescence quenching of stable dispersions of silicon nanoparticles

W. D. Kirkey, Y. Sahoo, X. Li, Y. He, M. T. Swihart, A. N. Cartwright, S. Bruckenstein and P. N. Prasad, J. Mater. Chem., 2005, 15, 2028 DOI: 10.1039/B417648K

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