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N-doped carbon dots: green and efficient synthesis on large-scale and their application in fluorescent pH sensing

Abstract

A green and efficient anhydrous strategy was developed for one-step synthesis of nitrogen-doped carbon dots (N-CDs) using sucrose and urea as carbon and nitrogen source, respectively. The reaction was carried out at ambient pressure by directly putting the mixture powder of sucrose and urea into heated edible oil, N-CDs could be generated in several minutes and obtained by simply separating off the edible oil, which could be used again, it is therefore a green method and suitable for synthesis of N-CDs on large-scale. The as synthesized N-CDs are demonstrated to possess higher photostability, excellent optical properties and ultra-low cytotoxicity. Noticeably, the N-CDs exhibit a distinct pH-sensitive feature, and their fluorescent intensity increases linearly in the pH range from 6.75 to 11.0, therefore, the synthesized N-CDs can be used to construct pH fluorescent sensor, and the successful pH monitoring of environmental water samples demonstrates their applicability in complex matrixes. Our work would open up a new avenue for the green and convenient synthesis of high-performance heteroatom doped materials on large-scale.

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Publication details

The article was received on 29 May 2017, accepted on 04 Aug 2017 and first published on 07 Aug 2017


Article type: Paper
DOI: 10.1039/C7NJ01889D
Citation: New J. Chem., 2017, Accepted Manuscript
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    N-doped carbon dots: green and efficient synthesis on large-scale and their application in fluorescent pH sensing

    X. Liu, J. Liu, B. Zheng, L. Yan, J. Dai, Z. zhuang, J. Du, Y. Guo and D. Xiao, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ01889D

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