Photoluminescence from gas-suspended SiOx nanoparticles synthesized by laser ablation

David B. Geohegan; Alex A. Puretzky; Gerd Duscher; Stephen J. Pennycook

doi:10.1063/1.121892

Photoluminescence from gas-suspended SiO_x nanoparticles synthesized by laser ablation

David B. Geohegan, Alex A. Puretzky, Gerd Duscher, Stephen J. Pennycook

Functional Hybrid Nanomaterials

Research output: Contribution to journal › Article › peer-review

124 Scopus citations

Abstract

Time-resolved photoluminescence (PL) spectra are reported for gas-suspended 1-10 nm diameter SiO_x particles formed by laser ablation of Si into 1-10 Torr He and Ar. Three spectral bands (1.8, 2.5 and 3.2 eV) similar to PL from oxidized porous silicon were measured, but with a pronounced vibronic structure. Particle size and composition were determined with Z-contrast transmission electron microscopy imaging and high resolution electron energy loss spectroscopy linescans of individual nanoparticles. Maximized violet (3.2 eV) PL from the gas-suspended nanoparticles was correlated with an ex situ SiO_1.4 overall particle stoichiometry. Cryogenically-collected gas-suspended nanoparticles produced web-like-aggregate films exhibiting very weak PL. Standard anneals restored strong PL bands without vibronic structure, but otherwise in agreement with the PL measured from the gas-suspended nanoparticles.

Original language	English
Pages (from-to)	438-440
Number of pages	3
Journal	Applied Physics Letters
Volume	73
Issue number	4
DOIs	https://doi.org/10.1063/1.121892
State	Published - 1998

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title = "Photoluminescence from gas-suspended SiOx nanoparticles synthesized by laser ablation",

abstract = "Time-resolved photoluminescence (PL) spectra are reported for gas-suspended 1-10 nm diameter SiOx particles formed by laser ablation of Si into 1-10 Torr He and Ar. Three spectral bands (1.8, 2.5 and 3.2 eV) similar to PL from oxidized porous silicon were measured, but with a pronounced vibronic structure. Particle size and composition were determined with Z-contrast transmission electron microscopy imaging and high resolution electron energy loss spectroscopy linescans of individual nanoparticles. Maximized violet (3.2 eV) PL from the gas-suspended nanoparticles was correlated with an ex situ SiO1.4 overall particle stoichiometry. Cryogenically-collected gas-suspended nanoparticles produced web-like-aggregate films exhibiting very weak PL. Standard anneals restored strong PL bands without vibronic structure, but otherwise in agreement with the PL measured from the gas-suspended nanoparticles.",

author = "Geohegan, {David B.} and Puretzky, {Alex A.} and Gerd Duscher and Pennycook, {Stephen J.}",

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doi = "10.1063/1.121892",

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pages = "438--440",

journal = "Applied Physics Letters",

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T1 - Photoluminescence from gas-suspended SiOx nanoparticles synthesized by laser ablation

AU - Geohegan, David B.

AU - Puretzky, Alex A.

AU - Duscher, Gerd

AU - Pennycook, Stephen J.

PY - 1998

Y1 - 1998

N2 - Time-resolved photoluminescence (PL) spectra are reported for gas-suspended 1-10 nm diameter SiOx particles formed by laser ablation of Si into 1-10 Torr He and Ar. Three spectral bands (1.8, 2.5 and 3.2 eV) similar to PL from oxidized porous silicon were measured, but with a pronounced vibronic structure. Particle size and composition were determined with Z-contrast transmission electron microscopy imaging and high resolution electron energy loss spectroscopy linescans of individual nanoparticles. Maximized violet (3.2 eV) PL from the gas-suspended nanoparticles was correlated with an ex situ SiO1.4 overall particle stoichiometry. Cryogenically-collected gas-suspended nanoparticles produced web-like-aggregate films exhibiting very weak PL. Standard anneals restored strong PL bands without vibronic structure, but otherwise in agreement with the PL measured from the gas-suspended nanoparticles.

AB - Time-resolved photoluminescence (PL) spectra are reported for gas-suspended 1-10 nm diameter SiOx particles formed by laser ablation of Si into 1-10 Torr He and Ar. Three spectral bands (1.8, 2.5 and 3.2 eV) similar to PL from oxidized porous silicon were measured, but with a pronounced vibronic structure. Particle size and composition were determined with Z-contrast transmission electron microscopy imaging and high resolution electron energy loss spectroscopy linescans of individual nanoparticles. Maximized violet (3.2 eV) PL from the gas-suspended nanoparticles was correlated with an ex situ SiO1.4 overall particle stoichiometry. Cryogenically-collected gas-suspended nanoparticles produced web-like-aggregate films exhibiting very weak PL. Standard anneals restored strong PL bands without vibronic structure, but otherwise in agreement with the PL measured from the gas-suspended nanoparticles.

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JO - Applied Physics Letters

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Photoluminescence from gas-suspended SiO_x nanoparticles synthesized by laser ablation

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