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题名: Highly luminescent N, S- Co-doped carbon dots and their direct use as mercury(II) sensor
作者: Wang, Yu1, 2;  Kim, Sung-Hoon2;  Feng, Liang1
关键词: Carbon dots ;  Multi-sensing ;  Mercury ;  Cyanide ;  Hydrosulfide
刊名: ANALYTICA CHIMICA ACTA
发表日期: 2015-08-26
DOI: 10.1016/j.aca.2015.07.051
卷: 890, 页:134-142
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical
研究领域[WOS]: Chemistry
英文摘要: Heteroatom doping has been proven as an efficient way to improve the fluorescent efficiency of carbon dots. Co-doping with heteroatoms may introduce more active sites to carbon dots, which would broaden applications of CDs in sensing. In this work, highly luminescent nitrogen and sulfur co-doped carbon dots (NSCDs) were synthesized through a facile one-step microwave assisted method by using citric acid and rubeanic acid as carbon, nitrogen, and sulfur sources. The well-isolated NSCDs not only exhibit an enhanced fluorescent efficiency with a relatively high quantum yield up to 17.6%, but also show potential use as a multi-sensing platform based on their fluorescence "on-off-on" and color changing behaviors. The NSCDs can be directly used for the selective determination of mercury cations without any functionalization. The detection limit is approximately calculated as 0.18 mu M and linear range is 0-20 mu M. The sensing mechanism is proposed as coordination reaction induced by oligomers upon the carbon core. Furthermore, in the presence of cyanide anions, the fluorescence shows linear recovery associated with the concentration of cyanide, indicating its potential usage for the detection of cyanide ion. The optimized pH range for such fluorescence "on-off-on" sensing system is investigated as pH 6-8, suggesting potential applications in bio-sensing and imaging area. In addition, by adding hydrosulfide anion to NSCDs@Hg2+ complex, a notable color change could be clearly observed due to the formation of fuscous HgS. In application, a handy test paper for direct and rapid detection of Hg2+ is manufactured for the evaluation of usage of NSCDs in the real circumstance. (C) 2015 Elsevier B.V. All rights reserved.
关键词[WOS]: GRAPHENE QUANTUM DOTS ;  LABEL-FREE DETECTION ;  SENSITIVE DETECTION ;  SILVER NANOPARTICLES ;  FLUORESCENT-PROBES ;  OXYGEN REDUCTION ;  GREEN SYNTHESIS ;  NITROGEN ;  IONS ;  SULFUR
语种: 英语
WOS记录号: WOS:000360646100012
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/146510
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Key Lab Separat Sci Analyt Chem, Dalian 116023, Peoples R China
2.Kyungpook Natl Univ, Dept Adv Organ Mat Sci & Engn, Daegu 702701, South Korea

Recommended Citation:
Wang, Yu,Kim, Sung-Hoon,Feng, Liang. Highly luminescent N, S- Co-doped carbon dots and their direct use as mercury(II) sensor[J]. ANALYTICA CHIMICA ACTA,2015,890:134-142.
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