Selective chemical sensors based on fluorescent organic nanocrystals confined in sol–gel coatings of controlled porosity

Monnier, Virginie; Dubuisson, Emilie; Sanz-Menez, Nathalie; Boury, Bruno; Rouessac, V.; Ayral, A.; Pansu, Robert; Ibanez, Alain

doi:10.1016/j.micromeso.2010.04.004

Cited by 16 publications

(10 citation statements)

References 31 publications

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“…Light‐responsive organic nanoparticles, and especially nanoaggregates and nanocrystals, have gained fundamental and technological importance due to their potential applications in electronic, photonic, and optoelectronic nanolevel devices,1–7 and their scope in future nanoscience and nanotechnology is estimated to be enormous. Very recently, they have also been reported for use as photocatalysts8 and fluorescent sensors for the analysis of biological molecules and pollutants 9–15. In the field of biological and pharmaceutical sciences, they can improve the delivery of dyes for cell labeling,16 as well as the bioavailability of hydrophobic photosensitizers for anticancer phototherapy 17.…”

Section: Introductionmentioning

confidence: 99%

Dipolar versus Octupolar Triphenylamine‐Based Fluorescent Organic Nanoparticles as Brilliant One‐ and Two‐Photon Emitters for (Bio)imaging

Venkatakrishnan

Fery–Forgues

Campioli

et al. 2011

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Two related triphenylamine-based dipolar and octupolar fluorophores are used to prepare aqueous suspensions of fluorescent organic nanoparticles (FONs) via the reprecipitation method. The obtained spherical nanoparticles (30-40 nm in diameter) are fluorescent in aqueous solution (up to 15% fluorescence quantum yield) and exhibit extremely high one- and two-photon brightness, superior to those obtained for quantum dots. Despite the two chromophores showing similar fluorescence in solution, the fluorescence of FONs made from the octupolar derivative is significantly red-shifted compared to that generated by the dipolar FONs. In addition, the maximum two-photon absorption cross section of the FONs made from the octupolar derivative is 55% larger than that of the dipolar derivative FONs. The experimental observations provide evidence that the different molecular shape (rodlike versus three-branched) and charge distribution (dipolar versus octupolar) of the two chromophores strongly affect the packing inside the nanoparticles as well as their spectroscopic properties and colloidal stability in pure water. The use of these FONs as probes for biphotonic in-vivo imaging is investigated on Xenopus laevis tadpoles to test their utilization for angiography. When using FONs made from the octupolar dye, the formation of microagglomerates (2-5 μm scale) is observed in vivo, with subsequent lethal occlusion of the blood vessels. Conversely, the nanoparticles of the dipolar dye allow acute imaging of blood vessels thanks to their suitable size and brightness, while no toxic effect is observed. Such a goal cannot be achieved with the dissolved dye, which permeates the vessel walls.

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Section: Introductionmentioning

confidence: 99%

Dipolar versus Octupolar Triphenylamine‐Based Fluorescent Organic Nanoparticles as Brilliant One‐ and Two‐Photon Emitters for (Bio)imaging

Venkatakrishnan

Fery–Forgues

Campioli

et al. 2011

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“…17,18 Moreover, our group has used fluorescence confocal microscopy to characterize nanocrystals fluorescence. 16 This has shown that the silicate matrix does not exhibit fluorescence compared to the one coming from the organic nanocrystals. These unique properties of molecular organic nanocrystals can induce high fluorescence contrasts depending on the biological medium, allowing very low detection thresholds to be reached.…”

Section: Structural Characterization Of Nanocrystalsmentioning

confidence: 99%

“…A one-step sol-gel process was used to elaborate and anchor fluorescent organic nanocrystals in a transparent silicate matrix. 15,16 These nanocrystals, constituted of a high number of molecules, proved to be highly fluorescent and photostable at the same time. Hairpin DNA-probe fragments functionalized by a quencher which inhibits the fluorescence by Fo¨rster Resonance Energy Transfer (FRET) were covalently linked to the nanocrystals emerging on the surface from sol-gel thin films.…”

Section: Introductionmentioning

confidence: 99%

Fluorescent molecular nanocrystals anchored in sol–gel thin films: a label-free signalization function for biosensing applications

Dubuisson

Szunerits²,

Bacia

et al. 2011

New J. Chem.

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“…Besides, rubrene single crystals can also be prepared by “hot wall” deposition method 9 , in situ vacuum annealing 10 , or solution growth methods (such as slow evaporation 11 and cooling from supersaturated solution 12 ). Rubrene thin films have been deposited by various techniques such as sol–gel coating 13 , combinatorial molecular beam epitaxy (MBE) technology 14 , solution-mediated vacuum deposition 15 , or spin-coating 16 . In initial works, OFETs based on rubrene thin-film demonstrated a very low mobility (~ 10 –6 cm 2 /V s).…”

Section: Introductionmentioning

confidence: 99%

Morphology and transport characterization of solution-processed rubrene thin films on polymer-modified substrates

Gao

Liu

Líu

et al. 2020

Sci Rep

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In this report, the morpho-structural peculiarities and the crystallization mechanisms in solutionprocessed, solvent vapor annealed (SVA) thin films of rubrene (5,6,11,12-tetraphenylnaphthacene) on different substrates were investigated. The high-quality rubrene crystal films with a triclinic crystal structure were successfully prepared on the FTO substrates (glass slide coated with fluorine-tin-oxide) modified by PLA (polylactic acid) for the first time. The area coverage of rubrene crystal and the sizes of rubrene dendritic crystals increased with increasing thickness of PLA film and concentration of rubrene solution. For rubrene molecules, FTO wafers with rough surface provided the possibility of heterogeneous nucleation. During the SVA process, there were two kinds of forces acting on the diffusion of rubrene molecules: one force was provided by the residual chloroform solvent, which was perpendicular to the substrate, and the other force was provided by gaseous dichloromethane, which was parallel to the substrate. The synergy of these two forces was proposed to explain the nucleation and the crystallization processes of rubrene films. The higher nucleus of PLA/rubrene dendrites and the layer-by-layer stacking of needle-shaped nanocrystalline PLA/rubrene were important for exploring their kinetic formation process. Organic semiconductor materials, due to their outstanding performance in electronics and optoelectronics, have become the global focus for their promising potential in the research and applications of thin films and flexible electronic device 1-3. Rubrene (5,6,11,12-tetraphenylnaphthacene), as a typical p-type organic semiconductor material, holds a very high record of field-effect mobility (20 cm 2 /V s) 4 in the form of orthorhombic single crystal grown by physical vapor deposition method (PVD) 5-7 , and therefore is used in organic field-effect transistors (OFETs) 8. Besides, rubrene single crystals can also be prepared by "hot wall" deposition method 9 , in situ vacuum annealing 10 , or solution growth methods (such as slow evaporation 11 and cooling from supersaturated solution 12). Rubrene thin films have been deposited by various techniques such as sol-gel coating 13 , combinatorial molecular beam epitaxy (MBE) technology 14 , solution-mediated vacuum deposition 15 , or spincoating 16. In initial works, OFETs based on rubrene thin-film demonstrated a very low mobility (~ 10-6 cm 2 /V s). 17 Then, the mobility of polycrystalline rubrene OFET with hexamethyldisilazane (HMDS) coated SiO 2 dielectric was found to reach up to 10-2 cm 2 /V s 18. For the crystalline rubrene, considered as the active channel in OFETs, a variety of insulating organic polymers and small molecules have been used to induce crystallization of rubrene. Among these, the popular organics were 5, 12-diphenylanthracene and (ultra)high-molecularweight polystyrene (UHMW-PS) 19 , poly(4-vinylpyridine) (P4VP) and poly(methyl methacrylate) (PMMA) 20 , 6,13-pentacenequinone (PQ) 21 , 6,13-diazapentacene (DAP) 22 and so on. In addit...

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Selective chemical sensors based on fluorescent organic nanocrystals confined in sol–gel coatings of controlled porosity

Cited by 16 publications

References 31 publications

Dipolar versus Octupolar Triphenylamine‐Based Fluorescent Organic Nanoparticles as Brilliant One‐ and Two‐Photon Emitters for (Bio)imaging

Dipolar versus Octupolar Triphenylamine‐Based Fluorescent Organic Nanoparticles as Brilliant One‐ and Two‐Photon Emitters for (Bio)imaging

Fluorescent molecular nanocrystals anchored in sol–gel thin films: a label-free signalization function for biosensing applications

Morphology and transport characterization of solution-processed rubrene thin films on polymer-modified substrates

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