Luminescent carbon nanoparticles: effects of chemical functionalization, and evaluation of Ag+ sensing properties

Algarra, Manuel; Campos, Bruno; Radotić, Ksenija; Mutavdžić, Dragosav; Bandosz, Teresa J.; Jiménez-Jiménez, José; Rodríguez‐Castellón, Enrique; Silva, Joaquim C. G. Esteves da

doi:10.1039/c4ta00264d

Cited by 99 publications

(62 citation statements)

References 41 publications

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“…A quenching effect on CQD fluorescence has been observed for CQDs synthesized from lactose and then functionalized with mercaptosuccinic acid [27] as a result of the thiolAg interaction. In the other hand, other authors [28][29][30] reported a second mechanism of Ag + detection based on an enhancement on the carbon-based nanodots fluorescence due to the reduction of Ag + to Ag 0 .…”

Section: Introductionmentioning

confidence: 96%

Fluorescent carbon quantum dot hydrogels for direct determination of silver ions

Cayuela

Soriano

Kennedy

et al. 2016

Talanta

113

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Citation for published item:gyuelD engelin nd orinoD wF vur nd uennedyD turt F nd teedD tF F nd l¡ relD wF @PHITA 9pluoresent ron quntum dot hydrogels for diret determintion of silver ionsF9D lntFD ISI F ppF IHHEIHSF Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACTThe paper reports for the first time the direct determination of silver ion (Ag + ) using luminescent Carbon Quantum Dot hydrogels (CQDGs). Carbon Quantum Dots (CQDs) with different superficial moieties (passivate-CQDs with carboxylic groups, thiol-CQDs and amine-CQDs) were used to prepare hybrid gels using a low molecular weight hydrogelator (LMWG). The use of the gels results in considerable fluorescence enhancement and also markedly influences selectivity. The most selective CQDG system for Ag + ion detection proved to be those containing carboxylic groups onto their surface. The selectivity towards Ag + ions is possibly due to its flexible coordination sphere compared with other metal ions.This fluorescent sensing platform is based on the strong Ag-O interaction which can quench the photoluminescence of passivate-CQDs (p-CQDs) through charge transfer. The limit of detection (LOD) and quantification (LOQ) of the proposed method were 0.55 and 1.83 µg·mL -1 , respectively, being applied in river water samples.

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Section: Introductionmentioning

confidence: 96%

Fluorescent carbon quantum dot hydrogels for direct determination of silver ions

Cayuela

Soriano

Kennedy

et al. 2016

Talanta

113

View full text Add to dashboard Cite

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“…Thus, electrochemical, combustion, thermal, hydrothermal, acidic oxidation, microwave and ultrasonic, laser ablation, have been reported as techniques used for these purposes [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Although fluorescent CDs have easily been obtained by these strategies, emission features (in terms of sensitivity, meanly) and quantum yield (QY) of CDs are still scarce and highly desirable to be improved.…”

Section: Introductionmentioning

confidence: 98%

“…Doping heteroatoms into CDs has been demonstrated an effective approach to improve QY and for incorporating a surface passivation, which has showed good results [14,20]. Different strategies have been used to obtain doped CDs with nitrogen, such as those obtained by heating carbon tetrachloride and 1,2-ethylendiamine [21], by pyrolyzing ethanolamine [22], from citric acid and L-cysteine [23], glutamic [24], and folic acid [25].…”

Section: Introductionmentioning

confidence: 98%

Fluorescent chemosensor for pyridine based on N-doped carbon dots

Campos

Abellán

Zougagh

et al. 2015

Journal of Colloid and Interface Science

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“…Carbon dots synthesized from lactose with sulfuric acid treatment could be used as an effective fluorescent probe for Ag + detection after functioning with mercaptosuccinic acid (MSA) (CDs-MSA) [75]. The thiols of MSA, attached on the surface of CDs, were the active groups sensitive to the presence of Ag + (Fig.…”

Section: Other Metal Ions' Detectionmentioning

confidence: 99%

Carbon dots: synthetic methods and applications as fluorescent probes for the detection of metal ions, inorganic anions and organic molecules

et al. 2015

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and biological materials. It has been found that fluorescent probes are one of the most successful approaches. Fluorescent probes such as organic molecules have the advantages of high sensitivity and fast analysis, but they suffer from low water solubility. Semiconductor quantum dots (QDs) can be used as fluorescent probes, while the issue of toxicity limits their practical applications [1,2]. Fluorescent carbon dots (CDs) with similar physicochemical properties of QDs and relatively low in toxicity and cost of synthesis are the most suitable alternatives to organic molecules and QDs [3]. CDs gradually become a rising star as fluorescent probes in a number of fields [4,5]. CDs, a new member of carbon nanomaterial family with diameter below 10 nm, have great fluorescent performance, excellent dispersity and biocompatibility [6,7]. The synthetic methods of CDs can be classified into top-down and bottom-up approaches [8].Top-down methods rely on reducing the size of the graphite-like structures until the products become fluorescent nanoparticles. In the bottom-up processes, anything with carbogenic nature can synthesize CDs under suitable conditions [9]. Always the synthetic strategies and the precursors affect the internal properties of the resulting nanoparticles such as the size, crystallinity, oxygen or nitrogen content, emission characteristics and compatibility with a particular solvent [10][11][12][13]. Particularly, with the advantages of great dispersibility in water and tunable fluorescence, CDs are also becoming attractive alternatives for novel fluorescence markers, fluorescent probes and optical probes [14,15].In this review, we mainly summarize the recent advances of CDs about the easy synthesises, sensitive fluorescent detections of ions and organic molecules and possible detection mechanisms. It is our aim that the synthesis of this knowledge will offer valuable insight and inspire research into the exciting areas. Some suggestions and an outlook are put forward about the applications of CDs.Abstract Carbon dots (CDs), a new class of fluorescent materials, have recently attracted considerable research interest. CDs have overcome some defects of traditional nanomaterial. In addition to their small size and optical properties, CDs have the excellent advantages of good biocompatibility and are easy to achieve surface functionalization. Since this discovery, CDs can be widely used in the field of biochemical sensing and environmental testing. This article reviews the progress in the research and development of CDs on their syntheses, applications for the fluorescence detection and possible mechanisms. Finally, we have an outlook of the research trends and future prospects of CDs.

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Luminescent carbon nanoparticles: effects of chemical functionalization, and evaluation of Ag+ sensing properties

Cited by 99 publications

References 41 publications

Fluorescent carbon quantum dot hydrogels for direct determination of silver ions

Fluorescent carbon quantum dot hydrogels for direct determination of silver ions

Fluorescent chemosensor for pyridine based on N-doped carbon dots

Carbon dots: synthetic methods and applications as fluorescent probes for the detection of metal ions, inorganic anions and organic molecules

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