Multi-photon imaging of amine-functionalized silica nanoparticles

Filipe Natalioa, Anubha Kashyapb, Steffen Lorenzb, Hannes Kerschbaumera, Michael Dietzscha, Muhammad Nawaz Tahira, Heinz Duschnerc, Susanne Strandb, Dennis Strandb, and Wolfgang Tremela*

Supporting Information

a Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-

Universität, Duesbergweg 10-14, D-55099 Mainz, Germany. Fax: +49-6131-39-25605; Tel: +49-6131-39-25135; E-mail: tremel@uni-mainz.de

b Medizinische Klinik I, Universitätsmedizin, Johannes Gutenberg-Universität, Langenbeckstrasse 1, D-55131 Mainz, Germany.

c Universitätsmedizin, Angewandte Struktur- und Mikroanalytik, Johannes Gutenberg-

Universität, Obere Zahlbacher Str. 6, D-5

Electronic Supplementary Material (ESI) for NanoscaleThis journal is © The Royal Society of Chemistry 2012

Figures and captions

Figure S1. (A) Transmission Electron Microscopic (TEM) analysis of commercially available 20 nm

SiO2 nanoparticles. (B) Correspondent powder XRD spectrum showing that these nanoparticles are

amorphous. (C) Photoluminescence spectra of SiO2 nanoparticles (black lines) excited at 320 nm and

370 nm (shifted vertically for clarity), respectively, indicate that no intrinsic photoluminescence is

present. As control, pure water has been measured under the same conditions (blue lines). The high

intensity peaks originate from the Raman scattering of water (ν0 ~ 3400 cm-1).

C

Electronic Supplementary Material (ESI) for NanoscaleThis journal is © The Royal Society of Chemistry 2012

Figure S2. Overlay of survey X-ray photoelectron spectra (XPS) of unfunctionalized SiO2

nanoparticles (blue line) and M-dots (orange line) where additional peaks attributed to C and N are

observed.

O1s

N1s C1s

Si2p Si1s

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Figure S3. Two-photon photoluminescence spectra of M-dots displaying two bands at 458 nm (more

intense) and 535 nm (less intense).

 

Electronic Supplementary Material (ESI) for NanoscaleThis journal is © The Royal Society of Chemistry 2012