Abstract
Newly synthesized fluorescent nanoparticles of 2-amino-6-ethoxy-4-[4-(4-morpholinyl)phenyl]-3,5-pyridinedicarbonitrile have been developed and characterized for possible applications as security marker in paper documents. Nanoparticles have been prepared by reprecipitation in water under sonication. The size and the shape of these nanoparticles, characterized by light scattering and atomic force microscopy, have been found to be highly dependent on sonication power. Typical sizes range from tens to hundreds of nanometers. Furthermore, a remarkable increase in the fluorescence yield has been observed as nanoparticles sizes decrease. Finally, all of the above features, together with the striking stability of optical and mechanical properties over the course of months, allow for straightforward applications that rely on strong and stable fluorescence such as marking important or valuable documents.
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Acknowledgments
The authors thank Dr. Flavia Pinzari for her help in electron microscope analysis and Dr. Francesca Marini for his close reading and occasional correction of our text in the English language. Some experimental data reported in this paper were obtained at the LABCEMI (Laboratorio Centralizzato di Microscopia, Ottica ed Elettronica) of the Università Cattolica del Sacro Cuore di Roma (Italy) (http://webprd.rm.unicatt.it/pls/unicatt_rm/consultazione.mostra_pagina?id_pagina=20215). The Italian Ministry of Foreign Affairs and the Egyptian Ministry for Scientific Research supported this work through the Executive Program of Scientific and Technological Cooperation between Italy and Egypt in the years 2008–2010.
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Missori, M., De Spirito, M., Ferrari, L. et al. Novel fluorescent security marker. Part I: morphological and optical properties of 2-amino-6-ethoxy-4-[4-(4-morpholinyl)phenyl]-3,5-pyridinedicarbonitrile nanoparticles. J Nanopart Res 14, 649 (2012). https://doi.org/10.1007/s11051-011-0649-8
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DOI: https://doi.org/10.1007/s11051-011-0649-8