TY - JOUR
T1 - Eco-friendly flexographic ink from fluorene-based Schiff base pigment for anti-counterfeiting and printed electronics applications
AU - Muthamma, Kashmitha
AU - Sunil, Dhanya
AU - Shetty, Prakasha
AU - Kulkarni, Suresh D.
AU - Anand, P. J.
AU - Kekuda, Dhananjaya
N1 - Funding Information:
The authors would like to acknowledge Dr. Shivananda Wagle for providing lab facilities at the Manipal Technologies Limited, Udayavani Building, Udayavani Road, Manipal 576104, Karnataka, India.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/12
Y1 - 2021/12
N2 - The challenge to prevent the counterfeiting of documents and the development of flexible printed electronics are two thrust research areas that demand innovative techniques. This study reports the use of fluorene-based Schiff base (FBH) prepared via a simple, one-step and cost-effective method as a thermally stable and biocompatible pigment for environment-friendly, water-based flexographic ink for potential application in security printing and flexible printed electronics. The flexo ink coating and print on the UV dull security paper were invisible in the daylight but displayed bluish-green fluorescence under UV light. Moreover, the emission colour of the print was sensitive to changing pH, which further imparted the eco-friendly ink formulation an excellent covert performance that could be exploited for anti-counterfeit application. The functional ink formulation can also be smartly-utilized in stamp/ink pads to obtain invisible fingerprint for detecting forgery. The colorimetric, and densitometry studies, abrasion resistance and surface morphology analysis of both the coated and printed paper samples were also investigated. The electrical measurements of the prints on flexible and low-cost paper substrates with good mechanical properties exhibited high charge carrier mobility with p-type semiconductivity for use in organic printed transistors. This new functional ink could thus be a promising candidate for anti-counterfeiting applications, including food packaging, documents, labels and ink pads, as well as in secure printed electronics.
AB - The challenge to prevent the counterfeiting of documents and the development of flexible printed electronics are two thrust research areas that demand innovative techniques. This study reports the use of fluorene-based Schiff base (FBH) prepared via a simple, one-step and cost-effective method as a thermally stable and biocompatible pigment for environment-friendly, water-based flexographic ink for potential application in security printing and flexible printed electronics. The flexo ink coating and print on the UV dull security paper were invisible in the daylight but displayed bluish-green fluorescence under UV light. Moreover, the emission colour of the print was sensitive to changing pH, which further imparted the eco-friendly ink formulation an excellent covert performance that could be exploited for anti-counterfeit application. The functional ink formulation can also be smartly-utilized in stamp/ink pads to obtain invisible fingerprint for detecting forgery. The colorimetric, and densitometry studies, abrasion resistance and surface morphology analysis of both the coated and printed paper samples were also investigated. The electrical measurements of the prints on flexible and low-cost paper substrates with good mechanical properties exhibited high charge carrier mobility with p-type semiconductivity for use in organic printed transistors. This new functional ink could thus be a promising candidate for anti-counterfeiting applications, including food packaging, documents, labels and ink pads, as well as in secure printed electronics.
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U2 - 10.1016/j.porgcoat.2021.106463
DO - 10.1016/j.porgcoat.2021.106463
M3 - Article
AN - SCOPUS:85112737754
SN - 0033-0655
VL - 161
JO - Progress in Organic Coatings
JF - Progress in Organic Coatings
M1 - 106463
ER -