Applications of silver island films for the preparation of fluorescently based chemical sensors

Debono, Reno; Helluy, Anouk; Heimlich, M. S.; Krull, Ulrich J.

doi:10.1016/0925-4005(93)85292-i

Cited by 6 publications

(6 citation statements)

References 11 publications

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“…Supporting of Ag nanoparticles (NPs) on polymeric matrix is a unique and effective methodology being exploited by many researchers. Therefore, many studies had been carried out in this concern to produce Ag based materials applicable in various applications such as an antimicrobial filters, 6 wound dressing materials, 7 water disinfectants, 8 chemical sensors, 9 and protective cloths. 10,11 Actually, not only the antimicrobial agents (i.e.…”

Section: Introductionmentioning

confidence: 99%

Electrospun antimicrobial polyurethane nanofibers containing silver nanoparticles for biotechnological applications

et al. 2009

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In this study, a new class of polyurethane (PU) nanofibers containing silver (Ag) nanoparticles (NPs) was synthesized by electrospinning. A simple method that did not depending on additional foreign chemicals was used to self synthesize the silver NPs in/on PU nanofibers. The synthesis of silver NPs was carried out by exploiting the reduction ability of N,N-dimethylformamide (DMF), which is used mainly to decompose silver nitrate to silver NPs. Typically, a sol-gel consisting of AgNO 3 /PU was electrospun and aged for one week. Silver NPs were created in/on PU nanofibers. SEM confirmed the well oriented nanofibers and good dispersion of pure silver NPs. TEM indicated that the Ag NPs were 5 to 20 nm in diameter. XRD demonstrated the good crystalline features of silver metal. The mechanical properties of the nanofiber mats showed improvement with increasing silver NPs content. The fixedness of the silver NPs obtained on PU nanofibers was examined by harsh successive washing of the as-prepared mats using a large amount of water. The results confirmed the good stability of the synthesized nanofiber mats. Two model organisms, E. coli and S. typhimurium, were used to check the antimicrobial influence of these nanofiber mats. Subsequently, antimicrobial tests indicated that the prepared nanofibers have a high bactericidal effect. Accordingly, these results highlight the potential use of these nanofiber mats as antimicrobial agents.

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Section: Introductionmentioning

confidence: 99%

Electrospun antimicrobial polyurethane nanofibers containing silver nanoparticles for biotechnological applications

et al. 2009

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“…Modification of silver and its compounds is important to be applicable in various medical and paramedical fields, which is quit challenging for scientists till now. Recently, studies had been carried out to modify the silver so that it can be used in various applications such as an antimicrobial filters,6 wound dressing materials,7 water disinfectants,8 chemical sensors,9 and protective cloths 10…”

Section: Introductionmentioning

confidence: 99%

Self synthesize of silver nanoparticles in/on polyurethane nanofibers: Nano‐biotechnological approach

Sheikh

Barakat

Kanjwal

et al. 2009

J of Applied Polymer Sci

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In this study, we are introducing a new class of Polyurethane (PU) nanofibers containing silver nanoparticles (NPs) by electrospinning. A simple method not depending on the addition of foreign chemicals has been used to self-synthesize of silver NPs in/on PU nanofibers. Typically, a solÀgel consisting of AgNO 3 /PU/N,N-dimethylformamide (DMF) has been electrospun and aged for a week, so silver NPs have been created in/on PU nanofibers. Syntheses of silver NPs were carried out by exploiting the reduction ability of the DMF solvent which is the main constituent to obtain PU electrospun nanofibers in decomposition of silver nitrate precursor into silver NPs. Physiochemical characterizations confirmed well oriented nanofibers and good dispersing of pure silver NPs. Various parameters affecting utilizing of the prepared nanofibers on various nano-biotechnological fields have been studied. For instance, the obtained nanofiber mats were checked for mechanical properties which showed the improvement of the tensile strength upon increase in silver NPs content. Moreover, the nanofibers were subjected to 10 times successive washing experiments with using solid to liquid ratio of 3 : 5000 for 25 h, UV spectroscopy analysis reveals no losses of silver NPs from the PU nanofibers. 3T3-L1 fibroblasts were cultured in presence of the designed nanofibers. The morphological features of the cells attached on nanofibers were examined by BIO-SEM, which showed well attachment of cells to fibrous mats. The cytotoxicity results indicated absence of toxic effect on the 3T3-L1 cells after cell culturing.

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“…It has been known for a long time that metallic nanostructures can enhance the fluorescence of nearby fluorophores [37][38][39]. Interactions between the dipole moments of the fluorophores and the surface plasmon field of the metal can increase the incident light field, which results in enhanced local fluorescence intensity and rate of excitation.…”

Section: Metallic Nanomaterials For Fluorescence Enhancementmentioning

confidence: 99%

“…Interactions between the dipole moments of the fluorophores and the surface plasmon field of the metal can increase the incident light field, which results in enhanced local fluorescence intensity and rate of excitation. Such interactions also boost the radiative decay rates, leading to an improved quantum yield and a reduced lifetime of the fluorophore [37][38][39]. It has been estimated that the local electric field and the radiative rate could be increased by factors of 140 and 1,000, respectively, near a silver particle [38].…”

Section: Metallic Nanomaterials For Fluorescence Enhancementmentioning

confidence: 99%

Nanomaterials in fluorescence-based biosensing

2009

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Fluorescence-based detection is the most common method utilized in biosensing because of its high sensitivity, simplicity, and diversity. In the era of nanotechnology, nanomaterials are starting to replace traditional organic dyes as detection labels because they offer superior optical properties, such as brighter fluorescence, wider selections of excitation and emission wavelengths, higher photostability, etc. Their size-or shape-controllable optical characteristics also facilitate the selection of diverse probes for higher assay throughput. Furthermore, the nanostructure can provide a solid support for sensing assays with multiple probe molecules attached to each nanostructure, simplifying assay design and increasing the labeling ratio for higher sensitivity. The current review summarizes the applications of nanomaterialsincluding quantum dots, metal nanoparticles, and silica nanoparticles-in biosensing using detection techniques such as fluorescence, fluorescence resonance energy transfer (FRET), fluorescence lifetime measurement, and multiphoton microscopy. The advantages nanomaterials bring to the field of biosensing are discussed. The review also points out the importance of analytical separations in the preparation of nanomaterials with fine optical and physical properties for biosensing. In conclusion, nanotechnology provides a great opportunity to analytical chemists to develop better sensing strategies, but also relies on modern analytical techniques to pave its way to practical applications.Keywords Nanomaterials . Quantum dots . Gold nanoparticle . Silica nanoparticle . Fluorescence . FRET . Biosensing OverviewSensitive detection of target analytes present at trace levels in biological samples often requires the labeling of reporter molecules with fluorescent dyes, because fluorescence detection is by far the dominant detection method in the field of sensing technology, due to its simplicity, the convenience of transducing the optical signal, the availability of organic dyes with diverse spectral properties, and the rapid advances made in optical imaging. However, it can be difficult to obtain a low detection limit in fluorescence detection due to the limited extinction coefficients or quantum yields of organic dyes and the low dye-toreporter molecule labeling ratio. The recent explosion of nanotechnology, leading to the development of materials with submicron-sized dimensions and unique optical properties, has opened up new horizons for fluorescence detection. Nanomaterials can be made from both inorganic and organic materials and are less than 100 nm in length

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Applications of silver island films for the preparation of fluorescently based chemical sensors

Cited by 6 publications

References 11 publications

Electrospun antimicrobial polyurethane nanofibers containing silver nanoparticles for biotechnological applications

Electrospun antimicrobial polyurethane nanofibers containing silver nanoparticles for biotechnological applications

Self synthesize of silver nanoparticles in/on polyurethane nanofibers: Nano‐biotechnological approach

Nanomaterials in fluorescence-based biosensing

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