基于粒子间能级匹配构筑高性能化学发光碳纳米点及其在可再写纸应用研究

目前，可以重复使用的再写纸对社会经济、环境可持续发展方面的裨益是不言而喻的。然而基于传统刺激响应材料的再写纸普遍存在毒性高，可视对比度低，暗光环境显示效果差等缺陷，严重阻碍了其商业化应用。针对以上问题，本项目采用化学反应作为刺激源来实现调控开/关荧光材料明/暗可逆态这一新概念用于可擦写再写纸，利用新型刺激响应物碳纳米点无毒和发光易调节的特点，将其作为三基色墨水，设计并构建纸基底层-钝化层-草酸酯层-缓释层-过氧化氢层-钝化层多层结构排布的再写纸。通过尺寸效应和化学发光体系选择来调控碳纳米点与高能中间体粒子之间能级匹配，解决碳纳米点到高能中间体之间有效的电荷注入和传输这一难题，以此提升碳纳米点三基色化学发光性能；同时通过改善碳纳米点与化学发光体系间溶剂的相容性，有望实现该体系主动发光再写纸低毒、高可视对比度，可暗光显示的可重复打印。该项目的开展为探索新型可擦写再写纸提供理论依据与技术支撑。

So far, rewritable paper (RP) definitely benefits the sustainable development of economy, society and environment. However, the real-life applications in RP using traditional stimuli-responsive materials have been hindered by its high toxicity, low image contrast and poor display in dark environment. In view of the above problems, we will design and construct a filter paper-passivation layer-oxalic ester layer-sustained-release layer-hydrogen peroxide layer- passivation layer RP system, employing novel, nontoxic, emission-adjustable, and stimuli-responsive materials carbon nanodots (CDs) as the tricolor ink by virtue of the new concept with chemical reaction controlling the light and dark reversible state in fluorescent materials. In this system, we will achieve an energy level alignment between high-energy intermediates and CDs by quantum size effect and select the appropriate chemiluminiscence (CL) systems, which needs solving the problem on the effective injection and transfer of the electron from CDs to high-energy intermediate in order to promote the properties of tricolor CL in CDs. Meanwhile, the modification on the solvent compatibility between CDs and CL systems is applied to achieve low toxicity, high image contrast and good display in dark environment in the active CL based RP. Finally，we will provide theoretical basis and technical assistance in the exploration of new-type reusable RP.