Superhydrophobic photochromic rewritable paper based on graphene quantum dots for information storage and anticounterfeiting

As an information carrier, printing paper possesses a wide range of applications in many fields. However, its excessive waste, especially in the field of temporary reading, poses a threat to environmental resources and sustainable development. To alleviate this problem, photochromic materials that can be used for rewritable paper have aroused the interest of researchers. In this study, graphene quantum dots were creatively introduced into organic/inorganic hybrid system, promoting charge transfer induced by UV light and achieving rapid response characteristics. This novel material can achieve a maximum color contrast of 61.92% within 90 s and 86.8% of the maximum value in 10 s. In order to effectively avoid the failure of photoresponsive materials in contact with water, further spraying treatment endowed the material with superhydrophobicity and photoluminescence , forming a safe and stable system of information storage and transmission. Overall, this intelligent responsive material has broad application prospects in the field of anticounterfeiting rewritable paper.