Layer-by-layer immobilization of carbon dots fluorescent nanomaterials on single optical fiber

Gonçalves, Helena M. R.; Duarte, Abel J.; Davis, Frank; Higson, Séamus P.J.; Silva, Joaquim C. G. Esteves da

doi:10.1016/j.aca.2012.05.015

Cited by 46 publications

(25 citation statements)

References 21 publications

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“…It is very relevant in the case of optical fiber sensors because the Reprinted from [64] with permission from Elsevier substrate is made of glass, so that the losses due to refractive index change are reduced. On the other hand, the porous size can be adjusted to satisfy the specifications required by the final application depending on the reaction conditions.…”

Section: Sol-gel Matricesmentioning

confidence: 99%

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Fiber Optic Sensors Based on Nanostructured Materials

Elosúa

Hernáez

Matı́as

et al. 2014

Springer Series in Surface Sciences

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Fiber optic sensors have been developed taking advantage on the synergy between the properties of nanostructured materials and the ones that characterize an optical fiber. The mechanical properties of optical fiber introduce some restrictions to the techniques used for the deposition of materials. As an alternative to the classical deposition procedures, wet coating techniques have been successfully applied in these cases. The current chapter put emphasis on materials that can be incorporated using wet coating techniques. The first one presented is the multilayer based nanostructures: among the different alternatives, we have focused on materials prepared with the Layer-by-Layer technique. Another type of products used for the fabrication of optical fiber sensors is sol-gel matrices, which are made of silica, so that its optical properties are similar to the ones of an optical fiber. The other two described type of products have focused the attention of many researchers in the recent years. Firstly, materials with an enhanced selectivity are presented: the molecularly imprinted polymers (MIPs). Finally, sensors based on metallic nanolayers and particles are presented. All these materials and techniques have acquired a great importance in the field of optical fiber sensors due to their versatility and the good features that offer.

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Section: Sol-gel Matricesmentioning

confidence: 99%

“…As an example of a fluorescent based optical fiber sensor, in Fig. 13.4 the response of the fluorescence emission peak as a function of the concentration of Hg + ions is shown [64].…”

Section: Multilayer Based Nanostructuresmentioning

confidence: 99%

Fiber Optic Sensors Based on Nanostructured Materials

Elosúa

Hernáez

Matı́as

et al. 2014

Springer Series in Surface Sciences

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“…The fiber optic probe could be reversibly detected in aqueous solution [20]. To modify this probe, they functionalized the CDs with PEG 200 and N-acetyl-l-cysteine [21]. Then the CDs could immobilize in the tip of an optical fiber using the layer-by-layer deposition method, resulting in an increase in sensibility of the fluorescent probe.…”

Section: Mercury (Ii) Ion 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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“…They can absorb ultraviolet or visible light for ten minutes, and then can emit light continually for more than ten hours after removal of excitation resource [7,8]. Such functional fibers can be used for technical textiles such as decorations, protections and medical textiles etc [5,[9][10][11]. However, few studies have been found about using chelating reaction method to fabricate AECC fibers.…”

Section: Introductionmentioning

confidence: 99%

Development and characterization of the amidoxime/Europium (ІІІ)-chelated complex fibers

Wang

et al. 2014

Matéria (Rio J.)

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This paper presents a study of the amidoxime/Europium (ІІІ)-chelated complex (AECC) fibers which can be used as functional fibers for technical textiles such as decorations, protections and medical textiles etc. First, the EuCl 3 solution were prepared and reacted with amidoxime fibers using optimized process conditions at 50 °C, 5 hours. Subsequently, the morphology, element analysis, fluorescence and mechanical properties of the AECC fibers were systematically investigated. Finally, the effects of different pH values and temperature on the content of Eu (III) complexes fiber were studied, respectively. The results showed that the AECC fibers possess enhanced fluorescence intensity and good mechanical properties. The results also illustrated that coordination reaction was identified between Eu (III) ions and amidoxime fiber and the electronic energy of C1s, O1s, N1s and Eu (III) ions in amidoxime fibers has significant changes compared to original fibers. The fluorescence emission bands of the AECC fibers were observed when the excitation wavelength λ equal to 380 nm. In conclusion, this study provided a theoretical basis for the preparation and practical application of fluorescent fibers.

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Layer-by-layer immobilization of carbon dots fluorescent nanomaterials on single optical fiber

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Cited by 46 publications

References 21 publications

Fiber Optic Sensors Based on Nanostructured Materials

Fiber Optic Sensors Based on Nanostructured Materials

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

Development and characterization of the amidoxime/Europium (ІІІ)-chelated complex fibers

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