用于极端 pH 传感和智能打印应用的纤维素基荧光材料,ACS Nano

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用于极端 pH 传感和智能打印应用的纤维素基荧光材料
ACS Nano ( IF 15.8 ) Pub Date : 2023-02-14 , DOI: 10.1021/acsnano.2c12846
Haq Nawaz ₁ , Sheng Chen ₁ , Xun Zhang ₁ , Xin Li ₁ , Tingting You ₁ , Jun Zhang ₂ , Feng Xu ₁

Affiliation

环境响应荧光材料正在被广泛研究用于各种环境因素的无仪器测定。然而，开发一种环保型纤维素基荧光 pH 传感器来检测极端酸度和碱度仍然具有挑战性。在此，一种高荧光和多功能材料是由基于生物聚合物的醋酸纤维素开发的。通过使用 4,4'- 将 5-amino-2,3-dihydrophthalazine-1,4-dione (luminol) 化学键合到醋酸纤维素上，构建了一种基于生物聚合物的结构，其中包含 -C=O 和 -NH 等响应性官能团二苯基甲烷二异氰酸酯 (MDI) 作为交联剂。制备的材料（Lum-MDI-CA）通过紫外-可见、傅里叶变换红外、¹ H NMR、¹³C NMR 光谱学和荧光技术。该材料表现出出色的水蓝色荧光，并展示了极端 pH 传感应用。添加 MTPP 等对 pH 无响应的染料作为开发比率法的参考后，进一步揭示了有趣的结果。比例系统通过在窄 pH 范围内的视觉和荧光颜色变化响应，清楚地区分极端酸性 pH 值 1 与 pH 值 2 和极端碱性 pH 值 12、13 和 14。此外，该材料被制成透明柔性荧光薄膜，在智能食品包装和印刷应用中表现出出色的紫外线屏蔽、防伪印刷和雾度特性。

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Cellulose-Based Fluorescent Material for Extreme pH Sensing and Smart Printing Applications

Environment-responsive fluorescence materials are being widely investigated for instrument-free determination of various environmental factors. However, developing an eco-friendly cellulose-based fluorescent pH sensor for sensing extreme acidity and alkalinity is still challenging. Herein, a highly fluorescent and multifunctional material is developed from biopolymer-based cellulose acetate. A biopolymer-based structure containing responsive functional groups such as −C═O and −NH is constructed by chemically bonding 5-amino-2,3-dihydrophthalazine-1,4-dione (luminol) onto cellulose acetate using 4,4′-diphenylmethane diisocyanate (MDI) as a cross-linking agent. The prepared material (Lum-MDI-CA) is characterized by UV–vis, Fourier transform infrared, ¹H NMR, ¹³C NMR spectroscopies, and fluorescence techniques. The material exhibits excellent aqua blue fluorescence and demonstrates extreme pH sensing applications. Interesting results are further revealed after adding a pH-unresponsive dye such as MTPP as the reference to develop the ratiometric method. The ratiometric system clearly differentiates the extreme acidic pH 1 from pH 2 and extreme alkaline pH 12, 13, and 14 by visual and fluorescence color change response under a narrow pH range. In addition, the material is fabricated into transparent flexible fluorescent films which demonstrate an outstanding UV shielding, security printing, and haze properties for smart food packaging and printing applications.

更新日期：2023-02-14

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