Orange-red emitting MoO3:Sm3+ transparent nano-composite films for anti-counterfeiting and data secure applications. (13th June 2023)

• Record Type: Journal Article
• Authors: Kalaburgi, Bhimanagouda; Radha Krushna, B.R.; Subramanian, Balanehru; Daruka Prasad, B.; Manjunatha, K.; Yun Wu, Sheng; Shetty, Aparna; Nagabhushana, H.
• Is Part Of: European polymer journal. Volume 191(2023)
• Publication Date: 2023-06-13
• Subjects: Polymer nanocomposites -- Photoluminescence -- Anti-counterfeiting -- Fingerprint detection -- Folic acid; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; Polymerization; Polymers; Periodicals; Electronic journals; 547.705
• DOI: 10.1016/j.eurpolymj.2023.112031
• Languages: English
• ISSNs: 0014-3057

Abstract

Graphical abstract: Highlights: The surface modification of MoO3 NPs with folic acid. Sm 3+ doped MoO3 phosphor is a good option for the orange red emitting component. The optimised MoO3 NPs demonstrated good selectivity and contrast latent fingerprints. The NCs could be utilised for writing, printing, and anti-counterfeiting purposes. The PVA-CS films can be used as a layer to protect data information storage. Abstract: Poly(vinyl alcohol) (PVA) and chitosan (CS) based nanocomposites (NCs) filled by various weight percent of modified MoO3 :Sm 3+ (MS) nanoparticles (NPs). For the preparation, folic acid (FA) up to 150 mg were used via ultrasonication method then was cast to thin films. The changes in the structural properties of the prepared samples were examined by X-ray diffraction. FT-IR spectroscopy indicated the possible interactions of the MS NPs with the PVA/CS backbones through the absorption bands. MS NPs were homogeneously dispersed in the polymer matrix at nanoscale. The photoluminescence (PL) emission spectra of PVA/CS-MS NCs excited by 404 nm wavelength, with the key emission peaks centred at ∼ 563, ∼600 and ∼ 647 nm are mainly attributed to transitions from 4 G5/2 → 6 H5/2, 4 G5/2 → 6 H7/2, 4 G5/2 → 6 H9/2 respectively. The powder dusting method was used to visualize the latent fingerprints (LFPs) on various surfaces under 404 nm excitation. Additionally, PVA/CS matrix was masked on the developed fingerprints (FPs) for long term storage. The results clearly indicated that, the level 1–3 ridge features were stable up to 180 days with superior contrast and sensitivity. The optimized phosphor powder is used to fabricate unclonable security ink and brush mode technique was used to mark on various surfaces and exposed to UV 404 nm light. The results revealed that the present phosphor can garner significant interest for the use in personal identification and security encoding.