title: Novel chitosan-ZnO based nanocomposites as luminescent tags for cellulosic materials.
abstract: Novel chitosan-ZnO composites have been synthesized as luminescent taggants for cellulosic materials. The synthesized chitosan-ZnO nanospheres (CS-ZnO NS), chitosan-ZnO-oleic acid quantum dots (CS-ZnO-oleic QD) and chitosan-ZnO-oleic acid:Eu(3+) doped nanorods (CS-ZnO-oleic:Eu(3+) NR) were characterized by X-ray diffraction, photoluminescence spectroscopy, FTIR spectroscopy and transmission electron microscopy. The prepared luminescent CS-ZnO composites were used in printing paste and applied to different types of papers and textiles by using screen printing technique. The colorimetric values of the printed CS-ZnO-oleic acid and CS-ZnO-oleic:Eu(3+) showed that printing caused slightly change in color values. Scanning electron microscopy images and color values of the printed surface showed that CS-ZnO-oleic QD and highly luminescence CS-ZnO-olic:Eu(3+) NR are suitable for use as a printed security feature.
authors.affiliation: Department of Forgery and Counterfeiting Research, Forensic Medicine Authority, Ministry of Justice, El-Sayeda Zeinab, 11461 Cairo, Egypt. Electronic address: saiedelsayed2@yahoo.com.
authors.forename: Saeed El-Sayed
authors.initials: Sel-S
authors.lastname: Saeed
authors.forename: Mohamed M
authors.initials: MM
authors.lastname: El-Molla
authors.forename: Mohammad L
authors.initials: ML
authors.lastname: Hassan
authors.forename: Esam
authors.initials: E
authors.lastname: Bakir
authors.forename: Mohamed M S
authors.initials: MM
authors.lastname: Abdel-Mottaleb
authors.forename: Mohamed S A
authors.initials: MS
authors.lastname: Abdel-Mottaleb
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D049449:Luminescence; D008163:Luminescent Measurements; D046529:Microscopy, Electron, Transmission; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D043942:Nanotubes / Q000737:chemistry; D019301:Oleic Acid / Q000737:chemistry*; D010209:Paper; D011327:Printing; D045663:Quantum Dots / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013194:Staining and Labeling / Q000379:methods*; D013784:Textiles; D014961:X-Ray Diffraction; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D019301:Oleic Acid; D002482:Cellulose; D048271:Chitosan; D015034:Zinc Oxide
keywords: Cellulose; Eu(3+) doped chitosan-ZnO; Luminescent tags; Nanocomposites; Quantumdots; Security features