Bibliographies thématiques / Fluorescence Gold Clusters

Littérature scientifique sur le sujet « Fluorescence Gold Clusters »

Auteur : Grafiati
Publié le 7 septembre 2023

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Articles de revues sur le sujet "Fluorescence Gold Clusters"

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Raj, D. Rithesh, et C. Sudarsanakumar. « Surface Plasmon Resonance Based Fiber Optic Dopamine Sensor Using BSA-Gold Cluster/Polymer Composites ». Advanced Science Letters 24, no 8 (1 août 2018) : 5598–602. http://dx.doi.org/10.1166/asl.2018.12157.

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Highly luminescent BSA-gold clusters were synthesized and its polymer composites were prepared using PVA, PVP and PVA/PVP blend. UV-visible spectroscopy, Photoluminescence, Fourier transform infrared spectroscopy (FTIR), Transmission electron microscopy (TEM) and particle size analysis (DLS) were performed to determine the formation of gold clusters. Luminescence properties of BSA-Gold cluster and its polymer composites were evaluated and it is found that all polymers quench the fluorescence at 650 nm while PVP and PVP/PVA blend enhance the fluorescence at 450 nm. Further, a Surface Plasmon Resonance (SPR) based fiber optic sensor has been fabricated using PVP/BSA-gold clusters as the sensing material and its dopamine sensing properties were studied. The sensor shows a linear response in the range of 0 to 80 μM concentrations of dopamine and the limit of detection (LOD) of the sensor is 12 μM.
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Carotenuto, G., S. De Nicola et L. Nicolais. « Fluorescent Thiol-Derivatized Gold Clusters Embedded in Polymers ». Advances in Materials Science and Engineering 2013 (2013) : 1–6. http://dx.doi.org/10.1155/2013/548284.

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Owing to aurophilic interactions, linear and/or planar Au(I)-thiolate molecules spontaneously aggregate, leading to molecular gold clusters passivated by a thiolate monolayer coating. Differently from the thiolate precursors, such cluster compounds show very intensive visible fluorescence characteristics that can be tuned by alloying the gold clusters with silver atoms or by conjugating the electronic structure of the metallic core with unsaturated electronic structures in the organic ligand through the sulphur atom. Here, the photoluminescence features of some examples of these systems are shortly described.
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CAROTENUTO, G., A. LONGO, L. DE PETROCELLIS, S. DE NICOLA, P. REPETTO, P. PERLO et L. AMBROSIO. « SYNTHESIS OF MOLECULAR GOLD CLUSTERS WITH LUMINESCENCE PROPERTIES BY MERCAPTIDE THERMOLYSIS IN POLYMER MATRICES ». International Journal of Nanoscience 06, no 01 (février 2007) : 65–69. http://dx.doi.org/10.1142/s0219581x07004225.

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Highly fluorescent Au /polystyrene nanocomposite films have been prepared by thermal decomposition at 250°C of gold mercaptide molecules (dodecyl-mercaptide of gold(I), C 12 H 25 SAu ) dissolved in polystyrene. Owing to a continuous nucleation of metallic phase generated by the thermolysis reaction, molecular gold clusters, which are characterized by fluorescence properties because of the very small size, can be obtained by this very simple technique.
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Ganguly, Mainak, Jayasmita Jana, Anjali Pal et Tarasankar Pal. « Synergism of gold and silver invites enhanced fluorescence for practical applications ». RSC Advances 6, no 21 (2016) : 17683–703. http://dx.doi.org/10.1039/c5ra26430h.

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Qu, Xiaochao, Yichen Li, Lei Li, Yanran Wang, Jingning Liang et Jimin Liang. « Fluorescent Gold Nanoclusters : Synthesis and Recent Biological Application ». Journal of Nanomaterials 2015 (2015) : 1–23. http://dx.doi.org/10.1155/2015/784097.

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Fluorescent gold nanoclusters (AuNCs) have been extensively studied due to their unique construction and distinctive properties, which place them between single metal atoms and larger nanoparticles. The dimension of AuNCs is comparable to the Fermi wavelength of electrons, which lead to size-dependent fluorescence and other molecule-like properties. In this review, we summarize various synthesis strategies of fluorescent AuNCs and recent advances of biological applications such as biosensing, biolabeling, and bioimaging. The synthetic methods are considered as two routes: “Atoms to Clusters” and “Nanoparticles to Clusters.” The surface functionalization of AuNCs is described as the precondition for making future bioapplications possible, which can eventually influence their stability, biocompatibility, and other properties. And then we focus on the recent advances of AuNCs-based applications in biological sensing, biolabeling, and bioimaging and finally discuss the current challenges of AuNCs in controllable synthesis and biological application.
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Zhang, Yuwei, Ping Song, Tiankai Chen, Xiaodong Liu, Tao Chen, Zhemin Wu, Yong Wang, Jianping Xie et Weilin Xu. « Unique size-dependent nanocatalysis revealed at the single atomically precise gold cluster level ». Proceedings of the National Academy of Sciences 115, no 42 (1 octobre 2018) : 10588–93. http://dx.doi.org/10.1073/pnas.1805711115.

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Atomically precise metal clusters have attracted increasing interest owing to their unique size-dependent properties; however, little has been known about the effect of size on the catalytic properties of metal clusters at the single-cluster level. Here, by real-time monitoring with single-molecule fluorescence microscopy the size-dependent catalytic process of individual Au clusters at single-turnover resolution, we study the size-dependent catalytic behaviors of gold (Au) clusters at the single-cluster level, and then observe the strong size effect on the catalytic properties of individual Au clusters, in both catalytic product formation and dissociation processes. Surprisingly, indicated by both experiments and density functional theory (DFT) calculations, due to such a unique size effect, besides observing the different product dissociation behaviors on different-sized Au clusters, we also observe that small Au clusters [i.e., Au15(MPA)13; here, MPA denotes 3-mercaptopropionic acid] catalyze the product formation through a competitive Langmuir–Hinshelwood mechanism, while those relatively larger Au clusters [e.g., Au18(MPA)14 and Au25(MPA)18] or nanoparticles catalyze the same process through a noncompetitive Langmuir–Hinshelwood mechanism. Such a size effect on the nanocatalysis could be attributed intrinsically to the size-dependent electronic structure of Au clusters. Further analysis of dynamic activity fluctuation of Au clusters reveals more different catalytic properties between Au clusters and traditional Au nanoparticles due to their different size-dependent structures.
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Dolai, Santanu, Srestha Basu et Anumita Paul. « Aggregation induced delayed green fluorescence from assembly of gold nanoclusters : an advanced probe for “background free” pyrophosphate recognition ». Materials Advances 3, no 7 (2022) : 3286–92. http://dx.doi.org/10.1039/d1ma01095f.

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Sugiuchi, Mizuho, Junichi Maeba, Nobuyuki Okubo, Munetaka Iwamura, Koichi Nozaki et Katsuaki Konishi. « Aggregation-Induced Fluorescence-to-Phosphorescence Switching of Molecular Gold Clusters ». Journal of the American Chemical Society 139, no 49 (30 novembre 2017) : 17731–34. http://dx.doi.org/10.1021/jacs.7b10201.

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Battista, Edmondo, Maria Laura Coluccio, Alessandro Alabastri, Marianna Barberio, Filippo Causa, Paolo Antonio Netti, Enzo Di Fabrizio et Francesco Gentile. « Metal enhanced fluorescence on super-hydrophobic clusters of gold nanoparticles ». Microelectronic Engineering 175 (mai 2017) : 7–11. http://dx.doi.org/10.1016/j.mee.2016.12.013.

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Moreaud, Laureen, Janak Prasad, Serges Mazères, Cécile Marcelot, Clothilde Comby-Zerbino, Rodolphe Antoine, Olivier Heintz et Erik Dujardin. « Facile one-pot synthesis of white emitting gold nanocluster solutions composed of red, green and blue emitters ». Journal of Materials Chemistry C 10, no 6 (2022) : 2263–70. http://dx.doi.org/10.1039/d1tc04874k.

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Thèses sur le sujet "Fluorescence Gold Clusters"

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Vasconcelos, Diego Andrade. « Obtenção de nanoclusters fluorescentes de ouro em puliuretanos a base de ß-ciclodextrinas ». Universidade Federal de Sergipe, 2015. https://ri.ufs.br/handle/riufs/6115.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
An increase in the research interest related to nanomaterials, with gold-based ones being among the most studied, have been noticed. These materials are higlighted mainly due to their particular features acquired when sizes are reduced to nanometric scale. Metallic nanosystems have interesting physical properties such as photon emission and absorption, quantum confinement, among other optical phenomena. Many research works foccus on the synthesis, controlling sizes of these metallic systems. Gold clusters have been employed for diverse functions such as molecular dyagnosis,, detection of chemical/biological agents, bioengineering, ion sensing, catalysis of chemical reactions, to name a few uses. Thus, this work is foccused on the synthesis and characterization of Au15 clusters using glutathione as stabilizer, coupling the clusters to the cavities of a cyclodextrins-derived polymer. The objectives are to increase the yield on gold clusters and to avoid their formation outside the cavities of the cyclodextrin-derived polymer, to study the catalytic effect of the gold clusters in the reduction of 4-nitrophenol (PNP) by NaBH4 to 4-aminophenol (PAP). Optical UV/visible absorption, photoluminescence (PL), fourier-transform infrared spectroscopy and transmission electron microscopy (MET) were used to characterize the samples. It was observed that the polymer matrix used allowed the synthesis of Au15 clusters with characteristic absorption at 405 nm, indicative of clusters with number of atoms near 15, as well as a strong emission both in solid state and in solution. The catalytic activity of the clusters obtained in the PNP reduction to PAP was demonstrated.
Percebe-se um aumento do interesse em pesquisas relacionadas a nanomateriais, sendo o ouro um dos materiais mais estudados. Este material destaca-se principalmente pelas características particulares adquiridas quando reduzido a escala nanometrica. Nanosistemas de metais pode possuir interessantes propriedades físicas, tais como emissão, absorção de fótons, confinamento quântico. Muitas pesquisas concentraram-se na síntese, controlando o tamanho desses Sistemas de metais. Clusters de ouro têm sido empregados para diversas finalidades tais como no diagnóstico molecular, detecção de agentes químicos/biológicos, bioengenharia, sensoriamento de íons, catalise de reações químicas, dentre outras. Assim, a presente pesquisa terá como foco sintetizar e caracterizar Clusters de Au15, usando como estabilizante a glutationa, acoplada em cavidades do polímero derivado de ciclodextrinas. Os objetivos são aumentar o rendimento dos Clusters de Au e evitar que sejam formados Clusters fora das cavidades do polímero derivado das ciclodextrinas, estudar o efeito catalítico dos Clusters de Au na redução do 4-nitrofenol (PNF) a 4-aminofenol (PAF) por NaBH4. Para a caracterização foram utilizados Absorção Óptica UV-Vis e fotoluminescência (PL), espectroscopia infravermelho por transformada de Fourier (FTIR- ATR), Microscopia Eletrônica de Transmissão (MET). Pode-se perceber que a matriz polimérica utilizada possibilitou a síntese dos Clusters de Au15, com absorção característica em 405 nm, esta que é característica do Au15, bem como uma forte emissão, tanto no estado solido, quanto em solução. Foi comprovado a atividade catalítica de tais Clusters na reação de redução do 4-nitrofenol a 4-aminofenol.
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Chapitres de livres sur le sujet "Fluorescence Gold Clusters"

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Muhammed, M. A. Habeeb, et Thalappil Pradeep. « Luminescent Quantum Clusters of Gold as Bio-Labels ». Dans Advanced Fluorescence Reporters in Chemistry and Biology II, 333–53. Berlin, Heidelberg : Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-04701-5_11.

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Antoine, Rodolphe, et Vlasta Bonačić-Koutecký. « Measurement Techniques of Optical Nonlinearities—Two-Photon Absorption/Fluorescence and Hyper-Rayleigh Scattering ». Dans Liganded silver and gold quantum clusters. Towards a new class of nonlinear optical nanomaterials, 49–62. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-64743-2_6.

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Vasimalai, Nagamalai, et Maria T. Fernandez-Argüelles. « Gold and Silver Fluorescent Nanomaterials as Emerging Probes for Toxic and Biochemical Sensors ». Dans Metal Nanoparticles and Clusters, 327–83. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68053-8_9.

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Actes de conférences sur le sujet "Fluorescence Gold Clusters"

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Mishra, Dinesh, Fadi Aldeek, Serge Michael, Goutam Palui et Hedi Mattoussi. « Growth of fluorescence gold clusters using photo-chemically activated ligands ». Dans SPIE BiOS, sous la direction de Wolfgang J. Parak, Marek Osinski et Xing-Jie Liang. SPIE, 2016. http://dx.doi.org/10.1117/12.2212025.

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Wong, Eric K. L., et Geraldine L. Richmond. « Laser excitation spectroscopy : a probe of metal ion binding in polymers ». Dans International Laser Science Conference. Washington, D.C. : Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.fg6.

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The structure and the function of many macromolecules and organic polymers are dependent on the specific sites bound to metal ions. Metal binding in some ionic polymers is in the form of ionic clusters. The objective of our laser-induced fluorescence studies is to gain a better understanding of the structure and binding properties of these clusters by using europium ions as probes. Eu(III) has many unique spectral properties which make it a good luminescent probe of the metal binding in polymers. The energy, fluorescence quantum yield, and lifetime of the excited state of the 7F0 → 5D0 transition near 580 nm are very sensitive to the environment of the ions. By studying this transition in detail, it is possible to obtain unique optical information about the metal–molecule interaction. Metal binding in the perfluorosulfonate membrane, Nation (DuPont), has been studied here as function of such parameters as metal ion concentration and pH. The resulting excitation spectra show multiple peaks corresponding to different ionic environments. The results of these experiments are discussed in terms of the known macroscopic binding properties of this film.
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Case, W. E., A. W. Kueny et M. E. Koch. « Photon avalanche upconversion in Tm : YLF ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.mj8.

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Avalanche excitation of thulium in YLF using laser light at 1.04 microns produces blue fluorescence and even stronger emissions of ultraviolet. The pump frequency is resonant only with a transition (3F4 → 3F2) from an excited state, not the ground state. If the pump intensity exceeds a certain threshold value, sustaining an absorber population becomes possible through crossrelaxation feedback from an upper state. We have previously reported1 on an avalanche model for Tm ions based on a presumed known two-ion cross-relaxation process (3H4, 3H6 → 3F4,3F4) and the assumption that Tm excitation is quasi-homogeneous in the pumped volume. Although the model correctly predicts important qualitative features of the avalanche, quantitative predictions are not in good agreement with experimental data. In this paper, we will report on several new directions taken in our theoretical modeling. Most successful is the idea of small clusters of Tm ions distinguishable in optical response from a more uniform background. The clusters account for both avalanche absorption of pump energy and upconversion.
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