Wiwasuku Theanchai, Suebphanpho Jitti, Ittisanronnachai Somlak, Promarak Vinich, Boonmak Jaursup, Youngme Sujittra
Materials Chemistry Research Center and Center of Excellence for Innovation in Chemistry, Department of Chemistry, Faculty of Science, Khon Kaen University Khon Kaen 40002 Thailand
Functional Materials and Nanotechnology Center of Excellence, School of Science, Walailak University Nakhon Si Thammarat 80160 Thailand.
RSC Adv. 2023 Jun 15;13(26):18138-18144. doi: 10.1039/d3ra00195d. eCollection 2023 Jun 9.
An easy-to-use, highly selective, and real-time organic solvent quality assessment is desirable to detect water contamination in organic solvents. Herein, a one-step procedure using ultrasound irradiation was used for encapsulating nanoscale carbon dots (CDs) into metal-organic framework-199 (HKUST-1) to form CDs@HKUST-1 composite. The CDs@HKUST-1 exhibited very weak fluorescence due to photo-induced electron transfer (PET) from the CDs to the Cu centers, acting as a fluorescent sensor in its off-state. The designed material can detect and discriminate water from other organic solvents, driven by turn-on fluorescence. This highly sensitive sensing platform could be applied for the detection of water in ethanol, acetonitrile, and acetone with wide linear detection ranges of 0-70% v/v, 2-12% v/v, and 10-50% v/v and limits of detection of 0.70% v/v, 0.59% v/v, and 1.08% v/v, respectively. The detection mechanism is attributed to the interruption of the PET process due to the release of fluorescent CDs after treatment with water. A smartphone-based quantitative test was successfully developed to monitor the water content in organic solvents utilizing CDs@HKUST-1 and a phone color processing application, thus making it possible to develop an on-site, real time and easy-to-use sensor for water detection.
为检测有机溶剂中的水污染，需要一种易于使用、高选择性且实时的有机溶剂质量评估方法。在此，采用一步超声辐照法将纳米级碳点（CDs）封装到金属有机框架-199（HKUST-1）中，形成CDs@HKUST-1复合材料。由于光诱导电子从CDs转移到铜中心，CDs@HKUST-1表现出非常弱的荧光，在其关闭状态下作为荧光传感器。所设计的材料能够通过开启荧光来检测和区分水与其他有机溶剂。这种高灵敏度传感平台可用于检测乙醇、乙腈和丙酮中的水，线性检测范围分别为0-70% v/v、2-12% v/v和10-50% v/v，检测限分别为0.70% v/v、0.59% v/v和1.08% v/v。检测机制归因于用水处理后荧光CDs的释放导致光诱导电子转移过程中断。利用CDs@HKUST-1和手机颜色处理应用程序成功开发了一种基于智能手机的定量测试方法，用于监测有机溶剂中的含水量，从而有可能开发一种现场、实时且易于使用的水检测传感器。
