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Open AccessArticle

Highly Fluorescent Green Carbon Dots as a Fluorescent Probe for Detecting Mineral Water pH

by Tingyu Wang 1,2, Guoqing Chen 1,2,*, Lei Li 1,2 and Yamin Wu 1,2
1
School of Science, Jiangnan University, Wuxi 214122, China
2
School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Wuxi 214122, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(17), 3801; https://doi.org/10.3390/s19173801
Received: 11 July 2019 / Revised: 13 August 2019 / Accepted: 27 August 2019 / Published: 3 September 2019
(This article belongs to the Section Chemical Sensors)
In this report, high-brightness green carbon dots were successfully prepared using 3,5-diaminobenzoic acid as the sole precursor and synthesized in one step using a solvothermal strategy. Under the excitation of 365 nm ultraviolet light, the quantum yield of carbon dots is as high as 53.8%. Experiments revealed that the carbon dots are highly carbonized and the surface is rich in amino and carboxyl groups. The synthesized carbon dots have good water solubility, and are resistant to ions and temperature. The fluorescence intensity of CDs is sensitive to pH changes and is linearly correlated with the pH in the near-neutral range (pH = 6.0 to 9.0). Our experiments showed that carbon dots were sensitive and accurate fluorescent probes for measuring the pH value of drinking water, which could provide an effective method for measuring the pH value of water in the future. View Full-Text
Keywords: carbon dots; solvothermal; 3,5-diaminobenzoic acid; pH; fluorescent probe carbon dots; solvothermal; 3,5-diaminobenzoic acid; pH; fluorescent probe
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MDPI and ACS Style

Wang, T.; Chen, G.; Li, L.; Wu, Y. Highly Fluorescent Green Carbon Dots as a Fluorescent Probe for Detecting Mineral Water pH. Sensors 2019, 19, 3801.

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