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Issue 20, 2005
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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 
Author affiliations

* Corresponding authors

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

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

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

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

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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Publication details

The article was received on 22 Nov 2004, accepted on 04 Mar 2005 and first published on 15 Apr 2005


Article type: Paper
DOI: 10.1039/B417648K
Citation: 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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