TY - JOUR
AU1 - Thirumalai, Rajasekaran
AU2 - Mukhopadhyay, Rahul Dev
AU3 - Praveen, Vakayil K.
AU4 - Ajayaghosh, Ayyappanpillai
AB - Protection of currency and valuable documents from counterfeit continues to be a challenge. While there are many embedded security features available for document safety, they are not immune to forgery. Fluorescence is a sensitive property, which responds to external stimuli such as solvent polarity, temperature or mechanical stress, however practical use in security applications is hampered due to several reasons. Therefore, a simple and specific stimuli responsive security feature that is difficult to duplicate is of great demand. Herein we report the design of a fluorescent molecular assembly on which water behaves as a self-erasable security marker for checking the authenticity of documents at point of care. The underlying principle involves the disciplined self-assembly of a tailor-made fluorescent molecule, which initially form a weak blue fluorescence (λem = 425 nm, Φf = 0.13) and changes to cyan emission (λem = 488 nm,Φf = 0.18) in contact with water due to a reversible molecular slipping motion. This simple chemical tool, based on the principles of molecular self-assembly and fluorescence modulation, allows creation of security labels and optically masked barcodes for multiple documents authentication.
TI - A slippery molecular assembly allows water as a self-erasable security marker
JF - Scientific Reports
DO - 10.1038/srep09842
DA - 2015-05-05
UR - https://www.deepdyve.com/lp/springer-journals/a-slippery-molecular-assembly-allows-water-as-a-self-erasable-security-0u9gxFo1kN
SP - 1
EP - 11
VL - 5
IS - 1
DP - DeepDyve
ER -