Photophysical properties of blue-emitting silicon nanoparticles

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Silicon nanoparticles with strong blue photoluminescence were synthesized by electrochemical etching of silicon wafers and ultrasonically removed under N2 atmosphere in organic solvents to produce colloids. Thermal treatment leads to the formation of colloidal Si particles of 3 ± 1 nm diameter, whic...

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Autores principales:	Llansola Portolés, Manuel José, Rodriguez Nieto, Felipe Jorge, Soria, Delia Beatriz, Amalvy, Javier Ignacio, Peruzzo, Pablo José, Mártire, Daniel Osvaldo, Kotler, Mónica L., Holub, Oliver, González, Mónica Cristina
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2009
Materias:	Ciencias Exactas Química Física Silicon nanoparticles One-photon excitation experiments
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/123590
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-123590
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Exactas Química Física Silicon nanoparticles One-photon excitation experiments
spellingShingle	Ciencias Exactas Química Física Silicon nanoparticles One-photon excitation experiments Llansola Portolés, Manuel José Rodriguez Nieto, Felipe Jorge Soria, Delia Beatriz Amalvy, Javier Ignacio Peruzzo, Pablo José Mártire, Daniel Osvaldo Kotler, Mónica L. Holub, Oliver González, Mónica Cristina Photophysical properties of blue-emitting silicon nanoparticles
topic_facet	Ciencias Exactas Química Física Silicon nanoparticles One-photon excitation experiments
description	Silicon nanoparticles with strong blue photoluminescence were synthesized by electrochemical etching of silicon wafers and ultrasonically removed under N2 atmosphere in organic solvents to produce colloids. Thermal treatment leads to the formation of colloidal Si particles of 3 ± 1 nm diameter, which upon excitation with 340−380 nm light exhibited room temperature luminescence in the range from 400 to 500 nm. The emission and the one- and two-photon excitation spectra of the particles are not sensitive to surface functionalization with methyl 2-methylprop-2-enoate. However, the derivatized particles show higher emission quantum yields in air-saturated suspensions (44%) than the underivatized particles (27%), as well as higher stability of its dispersions. FTIR and XPS spectra indicate a significant surface oxidation of the particles. The Si:O:C ratio at the surface of the derivatized particles estimated from XPS is Si<sub>3</sub>O<sub>6</sub>(C<sub>5</sub>O<sub>2</sub>H<sub>y</sub>)<sub>1</sub>, with y = 7−8. Vibronic spacing is observed in both the emission and excitation spectra. The information obtained from one-photon excitation experiments (emission and excitation spectra, photoluminescence quantum yields, luminescence decay lifetimes, and anisotropy correlation lifetimes), as well as from two-photon excitation fluorescence correlation spectroscopy (brightness and diffusion coefficients) and TEM, indicate that the blue-emitting particles are monodisperse and ball-shaped. Particle size clearly determines the emission and excitation spectral region, as expected from quantum confinement, but the presence and extent of Si−O species on the silicon networks seem crucial for determining the spectrum features and intensity of emission. The nanoparticles could hold great potential as quantum dots for applications as luminescence sensors in biology and environmental science.
format	Articulo Articulo
author	Llansola Portolés, Manuel José Rodriguez Nieto, Felipe Jorge Soria, Delia Beatriz Amalvy, Javier Ignacio Peruzzo, Pablo José Mártire, Daniel Osvaldo Kotler, Mónica L. Holub, Oliver González, Mónica Cristina
author_facet	Llansola Portolés, Manuel José Rodriguez Nieto, Felipe Jorge Soria, Delia Beatriz Amalvy, Javier Ignacio Peruzzo, Pablo José Mártire, Daniel Osvaldo Kotler, Mónica L. Holub, Oliver González, Mónica Cristina
author_sort	Llansola Portolés, Manuel José
title	Photophysical properties of blue-emitting silicon nanoparticles
title_short	Photophysical properties of blue-emitting silicon nanoparticles
title_full	Photophysical properties of blue-emitting silicon nanoparticles
title_fullStr	Photophysical properties of blue-emitting silicon nanoparticles
title_full_unstemmed	Photophysical properties of blue-emitting silicon nanoparticles
title_sort	photophysical properties of blue-emitting silicon nanoparticles
publishDate	2009
url	http://sedici.unlp.edu.ar/handle/10915/123590
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bdutipo_str	Repositorios
_version_	1764820449839022080

Photophysical properties of blue-emitting silicon nanoparticles

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