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Lookup NU author(s): Dr Norah O'Farrell, Dr Ben Horrocks, Dr Nigel Poolton, Professor Lidija Siller
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Silicon nanocrystals (SiNCs) modified with 18-mer DNA oligonucleotides have been studied by X-ray excited optical luminescence (XEOL) and X-ray absorption spectroscopy (XAS) in photoluminescence yield (PLY) and total electron yield (TEY) modes. Luminescence spectra from the DNA-modified SiNCs under X-ray excitation display distinct differences from simple alkyl terminated SiNCs. The DNA-modified SiNCs show strong luminescence at 540 +/- 10 nm under vacuum ultraviolet excitation which is assigned to nitrogen 1s - sigma* transitions within the DNA bases. Under excitation at 130 eV the PLY spectra from the same samples show the native nanocrystal ultraviolet emission band is suppressed, and the strongest emission peak is red shifted from 430 +/- 10 nm to 489 +/- 10 nm which we attribute to base nitrogen 1s transitions. In addition, a strong emission band in the infrared region at 815 +/- 10 nm is observed. This clearly resolved strong IR band from the DNA-modified SiNCs may provide a useful luminescence signature in cell-labeling techniques and open up a range of applications for in vivo assays. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3691600]
Author(s): Coxon PR, Newman M, Hunt MRC, O'Farrell N, Horrocks BR, Poolton NRJ, Siller L
Publication type: Article
Publication status: Published
Journal: Journal of Applied Physics
Year: 2012
Volume: 111
Issue: 5
Print publication date: 08/03/2012
ISSN (print): 0021-8979
ISSN (electronic): 1089-7550
Publisher: American Institute of Physics
URL: http://dx.doi.org/10.1063/1.3691600
DOI: 10.1063/1.3691600
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