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Title: Fluorescence of silicon nanoparticles suspended in water: reactive co-deposition for the control of surface properties of clusters
Authors: von Haeften, Klaus
Akraiam, A.
Torricelli, G.
Brewer, A.
First Published: 6-Oct-2010
Publisher: American Institute of Physics (AIP)
Citation: AIP Conference Proceedings, 2010, 1275 (1), BONSAI Project Symposium: Breakthroughs in Nanoparticles for Bio-Imaging, pp. 40-43.
Abstract: Fluorescent silicon nanoparticles have been produced in a two-step process in ultra high vacuum. First, silicon clusters were produced in the gas phase in a molecular beam. At the end of the cluster beam machine the cluster were co-deposited with water onto a cold target. Melting of the ice yields a suspension that fluoresces at 420 nm when excited with ultraviolet light. The fluorescence intensity remains constant over a period of more than a year. Photo-absorption and photo-luminescence spectra provide evidence of a Si/SiO2 core-shell structure having a silicon core size of at least 1.4 nm in diameter and oxygen deficient O-Si-O defects as the origin of the deep-blue fluorescence. Furthermore, the fluorescent suspension was deposited on freshly cleaved highly oriented pyrolytic graphite (HOPG). AFM images recorded in UHV showed networks of agglomerated clusters, their smallest units having a diameter of typically 0.7 nm.
DOI Link: 10.1063/1.3505080
ISBN: 9780735408265
Version: Publisher Version
Type: Conference paper
Rights: © 2010 American Institute of Physics. Deposited with reference to the publisher's archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Conference Papers & Presentations, Dept. of Physics and Astronomy

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