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Open AccessArticle

Porphin-Based Carbon Dots for “Turn Off–On” Phosphate Sensing and Cell Imaging

by Jing Wu, Wenjing Wang and Zonghua Wang *
College of Chemistry and Chemical Engineering, Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials, Qingdao University, Qingdao 266071, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Nanomaterials 2020, 10(2), 326; https://doi.org/10.3390/nano10020326
Received: 31 December 2019 / Revised: 2 February 2020 / Accepted: 8 February 2020 / Published: 14 February 2020
(This article belongs to the Special Issue Carbon Dot Sensors)
Porphin-based carbon dots (denoted as PCDs) are prepared through a one-step hydrothermal method by using meso-tetra (4-carboxyphenyl) porphin (TCPP), citric acid, and ethanediamine as precursor. PCDs give rise to the optimal photoluminescence at λexem = 375/645 nm, exhibit an excitation-independent property, excellent water solubility, and good biocompatibility, which provide red emission and avoid the autofluorescence as an efficient fluorescent imaging probe. On the other hand, when Eu3+ is added into PCDs, the carboxylate groups located on the surface of PCDs exhibit high affinity to Eu3+, resulting in the fluorescence of PCDs turning off via static quenching. In the presence of phosphate, owing to the strong coordination with Eu3+, the fluorescence of PCDs turns on. Based on this performance, a novel “turn off–on” phosphate sensing system is developed. The detection limit of this sensing system can attain 3.59 × 10−3 μmol L−1. This system has been utilized for the detection of phosphate in real samples successfully, which further demonstrates potential applications in biological diagnostic and environmental analysis.
Keywords: carbon dots; porphin; cell imaging; phosphate detection carbon dots; porphin; cell imaging; phosphate detection
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MDPI and ACS Style

Wu, J.; Wang, W.; Wang, Z. Porphin-Based Carbon Dots for “Turn Off–On” Phosphate Sensing and Cell Imaging. Nanomaterials 2020, 10, 326.

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