Zhang Mingliang, Zhao Jinchan, Wang Sinong, Dai Zhenyu, Qin Shuaitao, Mei Shiliang, Zhang Wanlu, Guo Ruiqian
Institute for Electric Light Sources, School of Information Science and Technology, Fudan University, Shanghai 200433, China.
Institute for Preservation and Conservation of Chinese Ancient Books, Fudan University Library, Fudan University, Shanghai 200433, China.
ACS Appl Mater Interfaces. 2024 Jan 31;16(4):5009-5018. doi: 10.1021/acsami.3c17011. Epub 2024 Jan 16.
Paper-based cultural relics constitute a significant and invaluable part of human civilization and cultural heritage. However, they are highly vulnerable to environmental factors such as ultraviolet (UV) photodegradation and acidification degradation, posing substantial threats to their long-term preservation. Carbon quantum dots (CQDs), known for their outstanding optical properties, high water solubility, and good safety, offer a promising solution for slowing down UV damage and acidification of paper-based relics during storage and transportation. Herein, we propose a feasible strategy for the simple preparation of CQDs with high dispersion stability, excellent UV absorption, room-temperature phosphorescence, and photostability for the safety protection of paper. Accelerated aging experiments were conducted using UV and dry-heat aging methods on both CQD-protected paper and unprotected paper, respectively, to evaluate the effectiveness of CQD protection. The results demonstrate a slowdown in both the oxidation and acid degradation processes of the protected paper under both UV-aging and dry-heat aging conditions. Notably, CQDs with complex luminescence patterns of both fluorescence and room-temperature phosphorescence also endue them as enhanced optical anticounterfeiting materials for multifunctional paper protection. This research provides a new direction for the protection of paper-based relics with emerging carbon nanomaterials.
纸质文物是人类文明和文化遗产的重要且珍贵的组成部分。然而，它们极易受到紫外线（UV）光降解和酸化降解等环境因素的影响，对其长期保存构成重大威胁。碳量子点（CQDs）以其出色的光学性能、高水溶性和良好的安全性而闻名，为减缓纸质文物在储存和运输过程中的紫外线损伤和酸化提供了一种有前景的解决方案。在此，我们提出了一种可行的策略，用于简单制备具有高分散稳定性、优异紫外线吸收、室温磷光和光稳定性的碳量子点，以用于纸张的安全保护。分别采用紫外线和干热老化方法对经碳量子点保护的纸张和未保护的纸张进行加速老化实验，以评估碳量子点保护的有效性。结果表明，在紫外线老化和干热老化条件下，受保护纸张的氧化和酸降解过程均有所减缓。值得注意的是，具有荧光和室温磷光复杂发光模式的碳量子点还使其成为用于多功能纸张保护的增强型光学防伪材料。这项研究为利用新兴碳纳米材料保护纸质文物提供了新方向。
