P.R. Coxon
DNA-modified silicon nanocrystals studied by X-ray luminescence and X-ray absorption spectroscopies: Observation of a strong infra-red luminescence band
Coxon, P.R.; Newman, M.; Hunt, M.R.C.; O'Farrell, N.; Horrocks, B.R.; Poolton, N.R.J.; Siller, L.
Authors
M. Newman
Dr Michael Hunt m.r.c.hunt@durham.ac.uk
Associate Professor
N. O'Farrell
B.R. Horrocks
N.R.J. Poolton
L. Siller
Abstract
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 – σ* 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 invivo assays.
Citation
Coxon, P., Newman, M., Hunt, M., O'Farrell, N., Horrocks, B., Poolton, N., & Siller, L. (2012). DNA-modified silicon nanocrystals studied by X-ray luminescence and X-ray absorption spectroscopies: Observation of a strong infra-red luminescence band. Journal of Applied Physics, 111(5), Article 054311. https://doi.org/10.1063/1.3691600
Journal Article Type | Article |
---|---|
Acceptance Date | Feb 2, 2012 |
Online Publication Date | Mar 8, 2012 |
Publication Date | Mar 8, 2012 |
Deposit Date | Jan 18, 2013 |
Publicly Available Date | Dec 3, 2018 |
Journal | Journal of Applied Physics |
Print ISSN | 0021-8979 |
Electronic ISSN | 1089-7550 |
Publisher | American Institute of Physics |
Peer Reviewed | Peer Reviewed |
Volume | 111 |
Issue | 5 |
Article Number | 054311 |
DOI | https://doi.org/10.1063/1.3691600 |
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Copyright Statement
© 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Coxon, P.R., Newman, M., Hunt, M.R.C., O'Farrell, N., Horrocks, B.R., Poolton, N.R.J. & Siller, L. (2012). DNA-modified silicon nanocrystals studied by X-ray luminescence and X-ray absorption spectroscopies: Observation of a strong infra-red luminescence band. Journal of Applied Physics 111(5): 054311 and may be found at https://doi.org/10.1063/1.3691600
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