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This thesis presents the preparation and characterization of spiropyran-functional paper. Such paper was prepared by dip-coating and benzophenone photocrosslinking strategies. The modified paper shows an obvious chromatic response to UV light and metal ions, which can be applied as colorimetric sensors. Meanwhile, the first proof-of-concept application of the modified paper for the control of capillary-driven transportation of water in paper-based microfluidic channel was also investigated.