Fluorescence of Fullerenes

Nascimento, Susana; Baleizão, Carlos; Berberan‐Santos, Mário N.

doi:10.1007/4243_2007_004

Cited by 6 publications

(3 citation statements)

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“…The absorption and fluorescence emission spectra are very similar for all layers ( 13 C 70 -PS, 13 C 70 -OS, and 13 C 70 -EC), with a broad absorption band extending from the visible to the UV. There are two fluorescence emission peaks, both located between 670 and 700 nm (Figure ) . The luminescence of 13 C 70 is strongly quenched by oxygen.…”

Section: Resultsmentioning

confidence: 97%

“…There are two fluorescence emission peaks, both located between 670 and 700 nm (Figure 1). 39 The luminescence of 13 matrixes are given in Figure 2. While investigated here via lifetime measurements for the sake of better precision, it shall be kept in mind that the sensors reported here also can be applied in intensity-based sensing.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Sensing and Imaging of Oxygen with Parts per Billion Limits of Detection and Based on the Quenching of the Delayed Fluorescence of ¹³C₇₀ Fullerene in Polymer Hosts

Kochmann

Baleizão²,

Berberan‐Santos³

et al. 2013

Anal. Chem.

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We report on a new method for sensing trace oxygen in the gas phase. It is based on the extreme efficiency of the quenching of the thermally activated delayed fluorescence of isotopically enriched carbon-13 fullerene C(70) ((13)C(70)). This fullerene was dissolved in polymer matrixes of varying oxygen permeability, viz., polystyrene (PS), ethyl cellulose (EC) and an organically modified silica gel ("ormosil"; OS). The sensor films (5-10 μm thick), on photoexcitation at 470 nm, display a strong delayed photoluminescence with peaks between 670 and 700 nm. Its quenching by molecular oxygen was studied at 25 and 60 °C and at concentrations from zero up to 150 ppmv of oxygen in nitrogen. The rapid lifetime determination (RLD) method was applied to determine oxygen-dependent lifetimes and for fluorescence lifetime imaging of oxygen. The lower limits of detection (at 1% quenching) vary with the polymer used (EC ∼250 ppbv, OS ∼320 ppbv, PS ∼530 ppbv at 25 °C) and with temperature. The oxygen sensors reported here are the most sensitive ones described so far.

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Section: Resultsmentioning

confidence: 97%

Section: ■ Results and Discussionmentioning

confidence: 99%

Sensing and Imaging of Oxygen with Parts per Billion Limits of Detection and Based on the Quenching of the Delayed Fluorescence of ¹³C₇₀ Fullerene in Polymer Hosts

Kochmann

Baleizão²,

Berberan‐Santos³

et al. 2013

Anal. Chem.

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“…The result is often a reduction in the bandgap; a review in 2013 gives reduced bandgap values of ~ 0.86 eV (~ 1440 nm) in the cases of neodymium, praseodymium and cerium caged inside the fullerene C 88 (Rivera-Nazario et al 2013). The fluorescence quantum yield of fullerenes is low: ~ 5 × 10 −4 , due to efficient intersystem crossing (Nascimento et al 2007). …”

Section: Fullerenesmentioning

confidence: 99%

Molecular imaging with nanoparticles: the dwarf actors revisited 10 years later

Thurner

Debbage

2018

Histochem Cell Biol

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We explore present-day trends and challenges in nanomedicine. Creativity in the laboratories continues: the published literature on novel nanoparticles is now vast. Nanoagents are discussed here which are composed entirely of strongly photoluminescent materials, tunable to desired optical properties and of inherently low toxicity. We focus on “quantum nanoparticles” prepared from allotropes of carbon. The principles behind strong, tunable photoluminescence are quantum mechanical: we present them in simple outline. The major industries racing to develop these materials can offer significant technical guidance to nanomedicine, which could help to custom-design strongly signalling nanoagents specifically for stated clinical applications. Since such agents are small, they can be targeted easily, making active targeting possible. We consider it timely now to study the interactions nanoparticles undergo with tissue components in living animals and to learn to understand and overcome the numerous barriers the organism interposes between the blood and targets in or on parenchymal cells. As the near infra-red spectrum opens up, detection of glowing nanoparticles several centimeters deep in a living human subject becomes calculable and we present a simple way to do this. Finally, we discuss the slow-fuse and resource-inefficient entry of nanoparticles into clinical application. A first possible reason is failure to target across the body’s barriers, see above. Second, in the sparse translational landscape funding and support gaps yawn widely between academic research and subsequent development. We consider the agendas of the numerous “stakeholders” participating in this sad landscape and point to some faint glimmers of hope for the future.

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Structural Effects on Fluorescence Emission

Valeur

Berberan‐Santos²

2012

Molecular Fluorescence

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Fluorescence of Fullerenes

Cited by 6 publications

References 55 publications

Sensing and Imaging of Oxygen with Parts per Billion Limits of Detection and Based on the Quenching of the Delayed Fluorescence of ¹³C₇₀ Fullerene in Polymer Hosts

Sensing and Imaging of Oxygen with Parts per Billion Limits of Detection and Based on the Quenching of the Delayed Fluorescence of ¹³C₇₀ Fullerene in Polymer Hosts

Molecular imaging with nanoparticles: the dwarf actors revisited 10 years later

Structural Effects on Fluorescence Emission

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Fluorescence of Fullerenes

Cited by 6 publications

References 55 publications

Sensing and Imaging of Oxygen with Parts per Billion Limits of Detection and Based on the Quenching of the Delayed Fluorescence of 13C70 Fullerene in Polymer Hosts

Sensing and Imaging of Oxygen with Parts per Billion Limits of Detection and Based on the Quenching of the Delayed Fluorescence of 13C70 Fullerene in Polymer Hosts

Molecular imaging with nanoparticles: the dwarf actors revisited 10 years later

Structural Effects on Fluorescence Emission

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Product

Resources

About

Sensing and Imaging of Oxygen with Parts per Billion Limits of Detection and Based on the Quenching of the Delayed Fluorescence of ¹³C₇₀ Fullerene in Polymer Hosts

Sensing and Imaging of Oxygen with Parts per Billion Limits of Detection and Based on the Quenching of the Delayed Fluorescence of ¹³C₇₀ Fullerene in Polymer Hosts