Size variation and optical absorption of sol-gel Ag nanoparticles doped SiO2 thin film

Babapour, A.; Akhavan, Omid; Moshfegh, A.Z.; Hosseini, Amirhossein

doi:10.1016/j.tsf.2005.12.191

Cited by 35 publications

(13 citation statements)

References 21 publications

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“…Also AFM imaging of the surface of the film before and after exposure to light indicated the appearance of surface features similar to those previously reported by us [23] and others [32,33] and attributed to the formation of silver nanostructures. Figure 1 shows the fluorescence emission spectra of R6G in water and sol-gel films.…”

Section: Film Characterisationsupporting

confidence: 87%

The Influence of Silver Nanostructures Formed in situ in Silica Sol–Gel Derived Films on the Rate of Förster Resonance Energy Transfer

et al. 2011

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The efficiency of Förster resonance energy transfer (FRET) can be enhanced in the presence of a metal. Herein, we demonstrate the increased efficiency for a novel model sensor system where FRET is shown to occur between Rhodamine 6G in the bulk sol-gel matrix and Texas Red, which is held a fixed distance away by covalent attachment onto a silane spacer. Silver colloids are formed using light to initiate the reduction of a silver salt, which can be achieved at controlled locations within the film. Both the fluorescence intensity and lifetime maps and analysis indicate that an enhanced FRET efficiency has been achieved in the presence of silver nanoparticles. An increase in efficiency of 1.2-1.5 times is demonstrated depending on the spacer used. The novelty of our approach lies in the method of silver-nanoparticle formation, which allows for the accurate positioning of the silver nanoparticles and hence selective fluorescence enhancement within a biocompatible host material. Our work gives a practical demonstration of metal-enhanced FRET and demonstrates the ability of such systems to be developed for molecular-recognition applications that could find use in lab-on-a-chip technologies.

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Section: Film Characterisationsupporting

confidence: 87%

The Influence of Silver Nanostructures Formed in situ in Silica Sol–Gel Derived Films on the Rate of Förster Resonance Energy Transfer

et al. 2011

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“…2 are consistent with images of silver nanoparticles presented by others. 9,10,[33][34][35] Silica films with a similar loading of silver have been investigated by other researchers using both AFM and UV-vis spectroscopy. 33 In that work spherical particles with diameters from 10 to 50 nm were observed and corroborated using UV-vis spectroscopy.…”

Section: Film Characterisationmentioning

confidence: 99%

In situ formation of silver nanostructures produced via laser irradiation within sol–gel derived films and their interaction with a fluorescence tagged protein

Hungerford

Toury

McLoskey

et al. 2010

Phys. Chem. Chem. Phys.

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The presence of a conducting metal surface is known to affect the emission of a fluorophore in its proximity. This can lead to an enhancement in its fluorescence intensity along with a decrease in the fluorescence lifetime. This phenomenon, sometimes known as metal enhanced fluorescence, has implications in the area of sensing and "lab on a chip" applications. Here controlled, localised use of metallic structures can be advantageous in enhancing the detection of a fluorescent signal. The sol-gel technique has been demonstrated as a useful method by which to produce a biocompatible material. The versatility of the reaction allows for the inclusion of metal ions, which can form metallic nanostructures permitting the potential enhancement of fluorescence to be exhibited. In this work we incorporate silver nitrate within silica sol-gel derived films produced using a simple procedure at relative low temperatures (close to ambient). A compact time-resolved fluorescence microscope equipped with a semiconductor laser was used to photoactivate the silver ions to form localised metallic structures within the films. Patterning was achieved by computer control of the microscope stage and using the laser in CW mode. The films were characterised using AFM and UV-vis spectroscopy to ascertain the presence of the photoactivated silver nanostructures. The effect of the presence of these structures was elucidated by studying the time-resolved fluorescence of FITC labelled bovine serum albumin adsorbed to the films, where a decrease in the lifetime of the FITC label was observed in the location of the nanostructures.

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“…As illustrated in Figure (b) inset, the photoemission peak at 367.8 eV (3d 5/2 ) was observed. The decrease in binding energy of Ag 3d 5/2 comparing with that of the naked AgNP (368.2 eV) indicated the successful grafting of polymeric chains on AgNP surface.…”

Section: Resultsmentioning

confidence: 98%

Design and synthesis of fluorescent core–shell nanoparticles with tunable lower critical solution temperature behavior and metal‐enhanced fluorescence

Liu

et al. 2013

J. Polym. Sci. Part A: Polym. Chem.

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In this article, the preparation of fluorescent nanohybrids with core–shell structure and metal‐enhanced fluorescence (MEF) effect was presented. The fluorescent core–shell nanohybrids were prepared using silver nanoparticles (AgNPs) as cores and fluorophore tethered thermoresponsive copolymers with tunable lower critical solution temperature (LCST) from 15 to 90 °C as shells. These thermoresponsive copolymers were synthesized by the random copolymerization of oligo(ethylene oxide) acrylate and di(ethylene oxide) ethyl ether acrylate using reversible addition–fragmentation chain transfer polymerization and grafted on to AgNPs surface via Ag–S coordination interaction. By thermal manipulation of polymer spacer between AgNPs and fluorophores, the tunable MEF was achieved. It was also revealed that the fluorescent nanohybrids would exhibit maximal MEF when the polymerization degree was tuned to 350. The manipulation of the solution temperatures below and above LCST resulted in switchable MEF behavior. In addition, the phase transition process of the thermoresponsive copolymer was also studied by MEF effect using this fluorescent core–shell nanohybrid design. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 87–95

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Size variation and optical absorption of sol-gel Ag nanoparticles doped SiO2 thin film

Cited by 35 publications

References 21 publications

The Influence of Silver Nanostructures Formed in situ in Silica Sol–Gel Derived Films on the Rate of Förster Resonance Energy Transfer

The Influence of Silver Nanostructures Formed in situ in Silica Sol–Gel Derived Films on the Rate of Förster Resonance Energy Transfer

In situ formation of silver nanostructures produced via laser irradiation within sol–gel derived films and their interaction with a fluorescence tagged protein

Design and synthesis of fluorescent core–shell nanoparticles with tunable lower critical solution temperature behavior and metal‐enhanced fluorescence

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