<br>具有AIE效应的疏水锰掺杂固态红光碳纳米点及其变色防伪水凝胶复合材料,Small

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具有AIE效应的疏水锰掺杂固态红光碳纳米点及其变色防伪水凝胶复合材料
Small ( IF 13.0 ) Pub Date : 2023-09-20 , DOI: 10.1002/smll.202304673
Xiao Gong _{1,

2} , Qingqing Xu ₂ , Jiurong Li ₂ , Yan Ma ₁ , Xiaoyan Li ₁ , Wanze Wu ₂ , Hangxiang Wang _{1,

3}

Affiliation

聚集引起的猝灭一直限制着碳纳米点的高浓度和固态应用。而以分子内运动为主的聚集诱导发射效应可能是解决这一问题的有效手段。在此，以2,2'-二硫代二苯甲酸为碳源，醋酸锰为掺杂剂源，通过一步水热法合成了收率95%的疏水性固态红光碳纳米点（M-CD）。 2,2'-二硫代二苯甲酸的二硫键作为分子旋转的对称中心，Mn催化M-CD的合成，促进中心石墨碳结构的形成。由于M-CDs特殊的荧光跃迁特性，M-CDs/琼脂水凝胶复合材料可以实现荧光跃迁行为。当这种复合水凝胶放入水中时，水分子通过水凝胶的网络结构与M-CDs接触，使得M-CDs聚集的水凝胶在365 nm激发下发出橙红色荧光。而在二甲基亚砜中，水凝胶网络中的水分子被取代，M-CD 在分散时发出蓝色荧光，这为信息加密提供了潜在的应用。此外，通过将M-CD与环氧树脂复合并涂覆在365 nm LED芯片上，制备了高性能单色发光二极管(LED)器件。

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Hydrophobic Mn-Doped Solid-State Red-Emitting Carbon Nanodots with AIE Effect and Their Hydrogel Composites for Color-Changing Anticounterfeiting

The aggregation-caused quenching has always limited the high concentration and solid-state applications of carbon nanodots. While the aggregation-induced emission effect, dominated by intramolecular motion, may be an effective means to solve this problem. Here, hydrophobic solid-state red-light carbon nanodots (M-CDs) with 95% yield are synthesized by a one-step hydrothermal method using 2,2'-dithiodibenzoic acid as the carbon source and manganese acetate as the dopant source. The disulfide bond of 2,2'-dithiodibenzoic acid serves as the symmetry center of molecular rotation and Mn catalyzes the synthesis of M-CDs, which promotes the formation of the central graphitic carbon structure. The M-CDs/agar hydrogel composites can achieve fluorescence transition behavior because of the special fluorescence transition properties of M-CDs. When this composite hydrogel is placed in water, water molecules contact with M-CDs through the network structure of the hydrogels, making the aggregated hydrogels of M-CDs fluorescence orange-red under 365 nm excitation. While in dimethyl sulfoxide, water molecules in the hydrogels network are replaced and the M-CDs fluoresce blue when dispersed, providing a potential application in information encryption. In addition, high-performance monochromatic light-emitting diode (LED) devices are prepared by compounding M-CDs with epoxy resin and coating them on 365 nm LED chips.

更新日期：2023-09-21

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