Synthesis and characterization of carbon nanoparticle/PVA/ chitosan for security ink applications

Nuryadin, Bebeh Wahid and Nurjanah, Ririn and Mahen, Ea Cahya Septia and Nuryantini, Ade Yeti (2017) Synthesis and characterization of carbon nanoparticle/PVA/ chitosan for security ink applications. Material Research Express, 4 (3). pp. 1-5. ISSN 2053-1591

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Abstract

Security ink using a carbon nanoparticle (C-dot)/PVA/chitosan-composite-based material has been successfully synthesized. The C-dot powder was prepared using a urea pyrolysis method. The precursors were synthesized using urea ((NH2)2CO, Mw  =  60.07 g mol−1) and citric acid (C6H8O7bold dotH2O, Mw  =  210.14 g mol−1) as the fuel and carbon sources, respectively. The C-dots were prepared by heating the precursor solution at 250 °C for 90 min. The security ink was fabricated using C-dots, polyvinyl alcohol (PVA, (CH2CH(OH)) n , with Mw  =  ~20 000 g mol−1) and chitosan as the dyes, resins and binders, respectively. The morphology and optical properties of the security ink were measured using SEM and EDX, a PL spectrometer and UV–vis spectroscopy. The viscosity properties of the security ink were measured using a viscometer. The characterization showed that the C-dots have a monodisperse particle size, a tetragonal structure and absorption spectra in the UV light region. It is shown that the PVA:chitosan concentration has a significant effect on the viscosity properties, so the viscosity is optimized for the security ink. In addition, the security ink was studied using a commercial printer, and the results show a good quality blue emission (450 nm) appearing under UV light exposure at 365 nm. The security ink C-dot/PVA/chitosan composite has potential applications in security, panel display, optoelectronic and optical devices on an industrial scale.

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