Abstract
Highly crystalline N and S co-doped carbon dots (NS CDs) were synthesized by a hydrothermal method using mesaconic acid, ethylenediamine, and sulfuric acid as C, N, and S sources.
Highlights
During the past decade, carbon dots have appeared as a new luminescent material.[1]
This paper reports the synthesis, characterization, and sensing application of highly crystalline nitrogen and sulfur co-doped carbon dots
The addition of ascorbic acid to the NS CDs-CrIJVI) mixture resulted in the reduction of CrIJVI) to CrIJIII), which led to the elimination of the inner filter effect resulting in the restoration of the fluorescence intensity of the NS CDs
Summary
Carbon dots have appeared as a new luminescent material.[1]. They have drawn extensive attention as they have numerous beneficial features such as chemical stability, outstanding photostability, low toxicity, high fluorescence quantum yield, and ease of surface fabrications,[2] which have led to their widespread applications in fluorescence sensing and bioimaging and as a photocatalyst, in energy storage and conversion, optoelectronic devices, drug delivery, and printing ink,[3] and a fluorescent probe for biomedical application and environmental remediation.[4]. Ping Ni et al have reported nitrogen and sulfur co-doped carbon dots synthesized from cysteine as a precursor with a quantum yield of 38% and have demonstrated their applicability as fluorescent probes for living cell imaging.[9]. Chen J. et al have prepared nitrogen and sulfur co-doped carbon dots via hydrothermal synthesis using citric acid and cystamine dihydrochloride precursors with a quantum yield of 39.7%. They have used the synthesized carbon dots for detection of CrIJVI) ions via the inner filter effect.[11]. To the best of our knowledge, not much work for the fluorescence sensing of metanil yellow using nitrogen sulfur-doped carbon dots is reported in the literature. Our advanced sensor could be used for practical applications
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