Dual-Emission Carbon Dots for Ratiometric Fluorescent Water Sensing, Relative Humidity Sensing, and Anticounterfeiting Applications,ACS Applied Nano Materials

当前位置： X-MOL 学术 › ACS Appl. Nano Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Dual-Emission Carbon Dots for Ratiometric Fluorescent Water Sensing, Relative Humidity Sensing, and Anticounterfeiting Applications
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-10-03 , DOI: 10.1021/acsanm.1c02148
Yujuan Qin ₁ , Yongju Bai ₁ , Pengcheng Huang ₁ , Fang-Ying Wu ₁

Affiliation

We synthesized blue fluorescent carbon quantum dots (CDs) by the solvothermal strategy using 2,5-dihydroxyterephthalic acid as the precursor. The as-prepared CD surfaces contain abundant carboxyl and hydroxyl groups and show excitation-independent emission and excellent chemical stability. Interestingly, with the increment of water contents in organic solvents, the CDs underwent a visual fluorescence color transition from blue to green, which could be attributed to the excited-state intramolecular proton transfer effect via the intermolecular hydrogen bonding between CDs and water. Based on this, we designed an effective ratiometric fluorescence water sensor in organic solvents, which featured self-calibration, visualization, rapid response (<20 s), and high sensitivity (limit of detection = 0.052%, v/v, in ethanol). The smartphone-based quantitative assay was also realized using CD-loaded paper strips through a color processing application and successfully applied to monitor the water content in spirit samples. Humidity sensing was further evaluated through the as-prepared CDs/polymer films. Remarkably, the CD-based sensors were well recyclable both with paper strips and polymer films. The as-prepared CDs also hold great potential for anticounterfeiting.

中文翻译：

用于比率荧光水传感、相对湿度传感和防伪应用的双发射碳点

我们使用 2,5-二羟基对苯二甲酸作为前体，通过溶剂热策略合成了蓝色荧光碳量子点 (CD)。所制备的 CD 表面含有丰富的羧基和羟基，并显示出与激发无关的发射和优异的化学稳定性。有趣的是，随着有机溶剂中水含量的增加，CDs 经历了从蓝色到绿色的视觉荧光颜色转变，这可能归因于 CDs 和水之间的分子间氢键产生的激发态分子内质子转移效应。基于此，我们设计了一种有效的有机溶剂比例荧光水传感器，具有自校准、可视化、快速响应（<20 s）和高灵敏度（检测限= 0.052%，v/v，乙醇中） . 基于智能手机的定量分析也通过颜色处理应用程序使用 CD 纸条实现，并成功应用于监测酒精样品中的水含量。通过制备的 CD/聚合物薄膜进一步评估了湿度传感。值得注意的是，基于 CD 的传感器可以很好地回收利用纸条和聚合物薄膜。制作好的光盘也具有很大的防伪潜力。

更新日期：2021-10-22

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南