Photochromic Sensors for Paper Marking
Elżbieta Sąsiadek-Andrzejczak, Malwina Jaszczak-Kuligowska, Mariusz Dudek, Adam K. Puszkarz, Marek Kozicki
TL;DR
This paper introduces photochromic sensors that change color when exposed to UV light, which can be used to mark and protect paper products.
Contribution
The novelty lies in developing reversible UV sensors with a retarder to control color change for marking and security applications.
Findings
The sensors change color reversibly under UVA radiation exposure.
A UV radiation retarder was successfully applied to delay and weaken the color change.
Potential applications include document security and UV dose measurement on paper products.
Abstract
This study presents UV radiation sensors for use as paper marking. The sensors turn pink under exposure to UVA radiation and the color change is reversible. Additionally, a UV radiation retarder was applied to the sensor to delay the reaction and weaken the change in sensor color. The color changes of the sensors were analyzed depending on the absorbed dose of UVA radiation using reflectance spectrophotometry. Furthermore, the chemical analysis and surface morphology of the samples were performed using Raman Spectroscopy and Scanning Electron Microscopy, respectively. In addition, the structure of the sensors on the paper surface was assessed using X-ray Micro-Computed Tomography. Finally, possible potential applications for these types of sensors were presented, including marking, securing, and protecting against the counterfeiting of documents, paper packaging, and other paper…
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Taxonomy
TopicsColor Science and Applications · Industrial Vision Systems and Defect Detection · Biosensors and Analytical Detection