Ratiometric fluorescence sensor based on carbon quantum dots for visual detection of hypochlorite ions

• Published in: Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology Vol. 24; no. 1
• Main Authors: Lu, Yifei, Wang, Sui, Guo, Zhiyong, Hu, Yufang
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.01.2022; Springer Nature B.V
• Subjects: Aqueous solutions; Biocompatibility; Biosensors; Carbon; Carbon dots; Characterization and Evaluation of Materials; Chemistry and Materials Science; Chitosan; Colorimetry; Fluorescence; Inorganic Chemistry; Lasers; Materials Science; Nanoparticles; Nanosensors; Nanotechnology; Optical Devices; Optics; Photonics; Physical Chemistry; Quantum dots; Research Paper; Ruthenium; Sensors; Fluorescent sensor; Carbon quantum dots; Visual detection; Hypochlorite; Biosensing; Ratiometric
• ISSN: 1388-0764; 1572-896X
• DOI: 10.1007/s11051-021-05388-x

A ratiometric fluorescence sensor (c-CDs/Ru(bpy) 3 2+ ) based on the selective recognition of chitosan carbon dots (c-CDs) on ClO − and combine with Ru(bpy) 3 2+ was established for sensitive and visual monitoring of hypochlorite ion (ClO − ). Using this nanosensor, a highly sensitive assay of ClO − in the linear range of 0.026 − 70 μM with a low detection limit (LOD) of 8.6 nM was provided by quenching the blue emission fluorescence. It is more attractive that ClO − can also be visualized by this nanosensor via evident color changes of the solution (from blue to red) under an ultraviolet (UV) lamp. In addition, since c-CDs and Ru(bpy) 3 2+ have good water dispersibility and water solubility, respectively, the sensor can be applied to the detection of HClO in 100% aqueous solution. This is a new colorimetric and fluorescent dual-mode nanosensor with more simple preparation procedures, low cost, and excellent biocompatibility. It provides a new method for detecting ClO − and promotes the development of biosensing.