Preparation of photochromic paper, using fibre attached spiropyran polymer networks

Photochromic paper was prepared by covalent immobilisation of functional polymer networks with spiropyran moieties on paper sheets. The chromatic response of spiropyran molecules in the system can be dynamically controlled by simple damping techniques using multilayered paper samples. Based on the colour change of the photochromic paper upon different UV doses, a first proof-of-concept application for a paper-based colourimetric UV sensor was developed.