Optical characterization of ultrasmall Si nanoparticles prepared through electrochemical dispersion of bulk Si.

Optical characterization of ultrasmall Si nanoparticles prepared through electrochemical dispersion of bulk Si. Research Abstract Details 

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Optical characterization of ultrasmall Si nanoparticles prepared through electrochemical dispersion of bulk Si. Abstract Text:

Dean A Eckhoff,Jason D B Sutin,Robert M Clegg,Enrico Gratton,Elena V Rogozhina,Paul V Braun,

Studying the properties and stability of silicon nanoparticles (Si-np) in aqueous environments may lead to novel applications in biological systems. In this work, we use absorption and photoluminescence (PL) spectroscopy to characterize ultrasmall Si-np prepared through anodic etching and ultrasonic fractionation of a crystalline Si wafer. Their behavior is studied over time in 2-propanol and during treatments with water, NaOH, HCl, and H(2)O(2). The observed population is divided into two types of material: bright species consisting of well-etched Si-np, approximately 1 nm in diameter, and dark species derived from partially etched or aggregated Si structures. The dark material is seen by its scattering in the 2-propanol and water solutions and is largely removed via precipitation with the NaOH or HCl treatment. The bright material includes three distinct species with their respective emissions in the UV-B, UV-A, and hard-blue regions of the spectrum. The hard-blue PL is shown to have a simple pH dependence with a pK(a) approximately 3, providing an important insight into its chemical origin and signaling for possible application of Si-np as environmental probes. Our results offer some potential for tailoring the PL properties of ultrasmall Si-np through control of their surface chemistry.

Optical characterization of ultrasmall Si nanoparticles prepared through electrochemical dispersion of bulk Si. Publishing Authors By Initials

DA Eckhoff,JD Sutin,RM Clegg,E Gratton,EV Rogozhina,PV Braun,

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Optical characterization of ultrasmall Si nanoparticles prepared through electrochemical dispersion of bulk Si. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: The journal of physical chemistry. B

VOLUME: 109

Page Numbers: 19786-97

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ISSN: 1520-6106

DAY: 27

MONTH: Oct

YEAR: 2005

Optical characterization of ultrasmall Si nanoparticles prepared through electrochemical dispersion of bulk Si. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Optical characterization of ultrasmall Si nanoparticles prepared through electrochemical dispersion of bulk Si.

AFFILIATION: Department of Physics and Laboratory for Fluorescence Dynamics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801, USA. deckhoff@uiuc.edu

Country: United States

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MEDLINETA: J Phys Chem B

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