Photoluminescent carbon dot sensor for carboxylated multiwalled carbon nanotube detection in river water

Cayuela, Angelina; Soriano, M. Laura; Valcárcel, Miguel

doi:10.1016/j.snb.2014.10.102

Cited by 46 publications

(37 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From a structural viewpoint, CDs are a relatively wide family of nanomaterials with a range of possible structures and variable optical properties. Their morphology is mostly quasi-spherical, and the structure can be graphitic [1], amorphous [7], or characterized by a C 3 N 4 crystalline core [8][9][10]. Even graphene quantum dots (GQDs), which can be pictured as nanometer-size fragments of monolayer graphene [11], may probably be considered a special sub-type of CDs because they display very similar photophysics despite the two-dimensional morphology.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, CDs can emit blue [16], green [1], or red light [17], and their fluorescence can be either independent of the excitation wavelength [18,19], or more commonly "tunable", in the sense that the emission peak continuously shifts as a function of the excitation wavelength [20]. Their fluorescence intensity can be sensitive to one particular ion in solution [21,22], or it can respond to a variety of interactions with other systems, such as carbon nanotubes (CNTs) [7].…”

Section: Introductionmentioning

confidence: 99%

“…Independently of the structural complexity, photoluminescence is certainly the most intriguing and, at the same time, the most unclear characteristic of these nanosystems. CD fluorescence is usually very strong [18,[24][25][26][27], tunable [1,6,26,[28][29][30], and sensitive to local environment: solvents [31,32], ions [22,33,34], pH [35], external agents such as carbon nanotubes (CNTs) [7,36]. Moreover, it usually occurs only when the nanoparticles are well dispersed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Carbon Nanodots: A Review—From the Current Understanding of the Fundamental Photophysics to the Full Control of the Optical Response

2018

View full text Add to dashboard Cite

Carbon dots (CDs) are an emerging family of nanosystems displaying a range of fascinating properties. Broadly speaking, they can be described as small, surface-functionalized carbonaceous nanoparticles characterized by an intense and tunable fluorescence, a marked sensitivity to the environment and a range of interesting photochemical properties. CDs are currently the subject of very intense research, motivated by their possible applications in many fields, including bioimaging, solar energy harvesting, nanosensing, light-emitting devices and photocatalyis. This review covers the latest advancements in the field of CDs, with a focus on the fundamental understanding of their key photophysical behaviour, which is still very debated. The photoluminescence mechanism, the origin of their peculiar fluorescence tunability, and their photo-chemical interactions with coupled systems are discussed in light of the latest developments in the field, such as the most recent results obtained by femtosecond time-resolved experiments, which have led to important steps forward in the fundamental understanding of CDs. The optical response of CDs appears to stem from a very complex interplay between the electronic states related to the core structure and those introduced by surface functionalization. In addition, the structure of CD energy levels and the electronic dynamics triggered by photo-excitation finely depend on the microscopic structure of any specific sub-type of CD. On the other hand, this remarkable variability makes CDs extremely versatile, a key benefit in view of their very wide range of applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Carbon Nanodots: A Review—From the Current Understanding of the Fundamental Photophysics to the Full Control of the Optical Response

2018

View full text Add to dashboard Cite

show abstract

“…In fact, most analytical applications are focused on techniques related to metal ion sensing. The quenching of photoluminescence of a variety of carbon-based nanodots has been extensively studied as a means to detect metal ions such as Hg 2+ , Pb 2+ , Au 3+ Co 2+ ,Cu 2+ or Fe 3+ [8][9][10][11][12][13][14][15] as well as metallic and other carbonaceous nanoparticles [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Fluorescent carbon quantum dot hydrogels for direct determination of silver ions

Cayuela

Soriano

Kennedy

et al. 2016

Talanta

112

View full text Add to dashboard Cite

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.

show abstract

“…In addition, simple synthesis procedures and easy functionalization results in broad application . As a new class of fluorescent material, carbon dots and graphene quantum dots have been studied as sensing probes for many materials such as hemoglobin, thrombin, glucose, mercury ion (Hg 2+ ), copper ion (Cu 2+ ) and iron(III) ion (Fe 3+ ) …”

Section: Introductionmentioning

confidence: 99%

Carbon quantum dots fluorescence quenching for potassium optode construction

2019

View full text Add to dashboard Cite

Photophysical phenomena associated with carbon nanoparticles in combination with biocompatibility and readily functionalizable properties have attracted significant interest for sensing and imaging applications. A potassium ion optode based on the fluorescence quenching of carbon quantum dots (CQDs) was constructed. The CQDs were synthesized using a microwave method, citric acid and 2,2′-(ethylene-dioxy) bis(ethylamine). A quantum yield of 7.1% was calculated for the synthesized CQDs.A linear dynamic range of about one-order of magnitude with a correlation coefficient of 0.99 was obtained. The optode was applied on real samples and a 0.60-1.60% error range was obtained relative to the ion-selective electrode. KEYWORDS carbon quantum dot, fluorescence, optode, potassium, quantum yield, quenching

show abstract

Photoluminescent carbon dot sensor for carboxylated multiwalled carbon nanotube detection in river water

Cited by 46 publications

References 41 publications

Carbon Nanodots: A Review—From the Current Understanding of the Fundamental Photophysics to the Full Control of the Optical Response

Carbon Nanodots: A Review—From the Current Understanding of the Fundamental Photophysics to the Full Control of the Optical Response

Fluorescent carbon quantum dot hydrogels for direct determination of silver ions

Carbon quantum dots fluorescence quenching for potassium optode construction

Contact Info

Product

Resources

About