Novel fluorescent security marker. Part I: morphological and optical properties of 2-amino-6-ethoxy-4-[4-(4-morpholinyl)phenyl]-3,5-pyridinedicarbonitrile nanoparticles |
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Authors: | M Missori M De Spirito L Ferrari S Selci A Gnoli F R Bertani A S Girgis H El-Saied and A H Basta |
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Institution: | (1) Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, Via del Fosso del Cavaliere 100, 00133 Rome, Italy;(2) Istituto di Fisica, Universit? Cattolica del Sacro Cuore, Largo F. Vito 1, 00168 Rome, Italy;(3) Pesticide Chemistry Department, National Research Center, Dokki, Cairo, 12622, Egypt;(4) Cellulose & Paper Department, National Research Center, Dokki, Cairo, 12622, Egypt |
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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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