The decoration of silver fractal-like nanostructure with Ag nanoparticles on the plastic slide for surface enhanced fluorescence

Dong, Jun; Gong, Jiamin; Liu, Jihong; Chen, Ming; Yan, Xuewen

doi:10.1016/j.electacta.2011.11.050

Cited by 8 publications

(5 citation statements)

References 28 publications

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“…Qu and Dai (2005) reported hierarchical ramified-like silver nanostructures prepared by carrying out the silver mirror reaction on copper foils. Dong et al (2012) obtained Ag fractal-like nanostructures decorated with Ag Nps using electrochemical deposition on a plastic surface. These ramified-like nanostructured materials have attracted great attention due to their unique properties leading to possible applications in catalysis and technological areas such as glucose and hydrogen peroxide sensors (Liu and Wang 2013;Zhou et al 1999;Qiu et al 2007Qiu et al , 2009Sun and Hagner 2007).…”

Section: Introductionmentioning

confidence: 99%

Ag nanoparticles formed by femtosecond pulse laser ablation in water: self-assembled fractal structures

et al. 2015

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We report for the first time on the formation of self-assembled fractals of spherical Ag nanoparticles (Nps) fabricated by femtosecond pulse laser ablation of a solid silver target in water. Fractal structures grew both in two and three Euclidean dimensions (d). Ramifiedfractal assemblies of 2 nm height and 5-14 lm large, decorated with Ag Nps of 3 nm size, were obtained in a 2d geometry when highly diluted drops of colloidal suspension were dried at a fast heating rate over a mica substrate. When less-diluted drops were dried at slow heating rate, isolated single Nps or rosette-like structures were formed. Fractal aggregates about 31 nm size in 3d geometry were observed in the as-prepared colloidal suspension. Electron diffraction and optical extinction spectroscopy (OES) analyses performed on the samples confirmed the presence of Ag and Ag 2 O. The analysis of the optical extinction spectrum, using the electrostatic approximation of Mie theory for small spheres, showed the existence of Ag bare core, Ag-Ag 2 O and air-Ag core-shell Nps, Ag-Ag 2 O being the most frequent type [69 % relative abundance (r.a.)]. Core-size and shellthickness distribution was derived from OES. In situ scattering measurements of the Ag colloidal suspension, carried out by small-angle X-ray scattering, indicate a mass fractal composed of packaged hD SAXS-= (5 ± 1) nm particles and fractal dimension d f = 2.5. Ex situ atomic force microscopy imaging displayed well-ramified structures, which, analyzed with box-counting method, yield a fractal dimension d f = 1.67. The growing behavior of these 2d and 3d self-assembled fractals is consistent with the diffusion-limited aggregation model.

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Section: Introductionmentioning

confidence: 99%

Ag nanoparticles formed by femtosecond pulse laser ablation in water: self-assembled fractal structures

et al. 2015

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“…We have demonstrated an inexpensive and spontaneous route to generate fractal aggregates of metal nanoparticles embedded in a free-standing polymer film, which can serve as efficient SERS substrates at NIR wavelengths. Although SERS enhancement factors greater by up to four orders of magnitude are possible through other fractal Au nanostructures [ 30 , 38 ], these systems are typically fabricated through complex routes such as electron beam lithography [ 53 ], synthetic colloidal techniques [ 38 , 54 ], and electrochemical reduction [ 47 ]. The resulting systems are expensive and often structurally rigid, making their implementation in high throughput, practical applications difficult.…”

Section: Discussionmentioning

confidence: 99%

“…Significant effort has been devoted to fabricating fractal metal structures [ 33 , 39 , 44 , 45 , 46 , 47 , 48 ] and understanding their field enhancement [ 26 , 40 , 41 , 42 , 49 ] for practical applications. For example, fractal substrates would be important in SERS-based detection techniques of biomolecules in the NIR where tissues show minimal absorbance [ 50 , 51 , 52 ].…”

Section: Introductionmentioning

confidence: 99%

“…Such metallodielectric films could be easily integrated with sensing device architectures that are disposable and rapidly replaceable. Films containing fractal arrays of metal nanoparticles have previously been generated through lithographic techniques [ 53 ], synthetic colloidal methods [ 38 , 54 ], and electrochemical reduction [ 47 ]. Drop casting techniques based on evaporation-induced self-assembly have also been employed to fabricate thin film-based SERS substrates [ 55 , 56 , 57 ].…”

Section: Introductionmentioning

confidence: 99%

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Spontaneous Formation of Fractal Aggregates of Au Nanoparticles in Epoxy-Siloxane Films and Their Application as Substrates for NIR Surface Enhanced Raman Spectroscopy

Basker

Saravanamuttu

2017

Polymers

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Abstract:We present a facile, inexpensive route to free-standing, thermo-mechanically robust and flexible epoxy-siloxane substrates embedded with fractal aggregates of Au nanoparticles, and demonstrate their efficiency as substrates for surface enhanced Raman spectroscopy (SERS) at NIR wavelengths. The metallodielectric films are prepared by generating Au nanoparticles through the in-situ reduction of gold (III) chloride trihydrate in epoxypropoxypropyl terminated polydimethyl siloxane (EDMS). The metal nanoparticles spontaneously aggregate into fractal structures in the colloid, which could then be drop-cast onto a substrate. Subsequent UV-initiated cationic polymerization of epoxide moieties in EDMS transforms the fluid colloid into a thin, free-standing film, which contains a dense distribution of fractal aggregates of Au nanoparticles. We used electron and optical microscopy as well as UV-Vis-NIR spectrometry to monitor the evolution of nanoparticles and to optically and structurally characterize the resulting films. Raman spectroscopy of the chromophore Eosin Y adsorbed onto the metallodielectric films showed that they are excellent SERS substrates at NIR excitation with an enhancement factor of~9.3 × 10 3 .

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“…This phenomenon is named as MEF. Usually, solid metallic films or nanoparticles with core-shell (metal-oxide) architecture were used to investigate MEF [4,[8][9][10][11][13][14][15][16][17][18][19][20] , but the complicated procedures were needed. Thus, in our work, we fabricated a simple Ag-PVP nanostructure to enhance the fluorescence intensities of the dyes instead of solid films or core-shell structures, and discussed the mechanism of the fluorescence enhancement and the difference in the enhancement ratios for two kinds of dyes, rhodamine B and fluorescein.…”

Section: Introductionmentioning

confidence: 99%

Study on the Metal-Enhanced Fluorescence of Dyes by Ag-Polyvinylpyrrolidone Nanocomposites

He¹,

Zhuo²,

Zhao³

et al. 2015

JNanoR

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In this work, the effects of Ag nanoparticles or Ag-PVP nanocomposites on the fluorescence properties of rhodamine B and fluorescein were investigated. The fluorescence intensities of the dyes could be largely enhanced by Ag nanoparticles with various concentrations. Moreover, the intensities were further increased by Ag-PVP nanocomposites. The results show that the maximum enhancement ratio of 36.5 fold is achieved for rhodamine B in the presence of 2% Ag-PVP nanocomposites, as well as 4.37 fold for fluorescein with 5% Ag-PVP nanocomposites. The enhancement is believed to mainly be originated from the increased excitation rate of the dyes due to the local electromagnetic field which is improved by the interaction of light with Ag nanoparticles. The further fluorescence enhancement of the dyes by Ag-PVP nanocomposites is attributed to the effective separation of Ag nanoparticles from the dyes by PVP molecules. Additionally, the difference in the enhancement ratio of two dyes was also discussed. The lower quantum yield of the dye, as well as higher overlapped degree between Ag nanoparticles and the absorption of dye result in the larger enhancement ratio. The research could be meaningful for improving the sensitivity of rapidly medical or biological assays.

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The decoration of silver fractal-like nanostructure with Ag nanoparticles on the plastic slide for surface enhanced fluorescence

Cited by 8 publications

References 28 publications

Ag nanoparticles formed by femtosecond pulse laser ablation in water: self-assembled fractal structures

Ag nanoparticles formed by femtosecond pulse laser ablation in water: self-assembled fractal structures

Spontaneous Formation of Fractal Aggregates of Au Nanoparticles in Epoxy-Siloxane Films and Their Application as Substrates for NIR Surface Enhanced Raman Spectroscopy

Study on the Metal-Enhanced Fluorescence of Dyes by Ag-Polyvinylpyrrolidone Nanocomposites

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