Surface effect on the size evolution of surface plasmon resonances of Ag and Au nanoparticles dispersed within mesoporous silica

Cai, Weiping; Hofmeister, H.; Rainer, Thomas

doi:10.1016/s1386-9477(01)00171-0

Cited by 55 publications

(39 citation statements)

References 24 publications

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“…4,8,11,12) In the present work, no obvious change in the absorption peak position for the [Au (8) SiO 2(3000/z) ] × z multilayers were observed as shown in Fig. 9.…”

Section: Discussionmentioning

confidence: 38%

“…Au/SiO 2 thin films have been prepared by several methods such as ion implantation, 3,5) sol-gel [6][7][8][9][10][11] and sputtering. [14][15][16] Generally, the heat-treatment after deposition of films was necessary to obtain the optical absorption characteristics.…”

Section: Discussionmentioning

confidence: 99%

“…A variety of techniques including melt quenching, 1,2) ion implantation. [3][4][5] sol-gel [6][7][8][9][10][11] and sputtering [12][13][14][15][16] have been employed to fabricate metal/glasses composite thin films. However, it is difficult to control the concentrations of metal particles using quenching, ion implantation and sol-gel methods.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Au/SiO2 Nano-Composite Multilayers by Helicon Plasma Sputtering and Their Optical Properties

et al. 2002

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Au/SiO 2 nano-composite multilayers were prepared by helicon plasma sputtering. The Au particles dispersed in the SiO 2 matrix grew with increasing deposition time in the initial time less than 10 s, then changed from network-like to film-like microstructure with increasing deposition time. The optimum deposition time for preparing the Au particles was 8 s, and the size of Au particles was about 6 to 8 nm. The absorption peak due to the surface plasmon resonance of Au particles was observed at the wavelength of 560 nm in the optical absorption spectra for the as-deposited Au/SiO 2 thin films containing 3.3 to 10.3 vol%Au. The intensity of the absorption peak increased with increasing Au content, and the optimum Au content was about 10.3 vol%.

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“…4,8,11,12) In the present work, no obvious change in the absorption peak position for the [Au (8) SiO 2(3000/z) ] × z multilayers were observed as shown in Fig. 9.…”

Section: Discussionmentioning

confidence: 38%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of Au/SiO2 Nano-Composite Multilayers by Helicon Plasma Sputtering and Their Optical Properties

et al. 2002

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“…In this case, even a small increase of sensitivity can open a way to use SPR technology for a new class of substances. Last years, a number of attempts have been made to improve this technique, they include a polarization of the incident light beam [6,7], a waveguide propagation of light [8][9][10] or using of porous active phases or even nanocrystals and nanoparticles [11][12][13][14][15][16][17][18]. We suggest here a new way to increase a signal / noise ratio of SPR devices.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Layers Increase Sensitivity of Affinity Sensors Based on Surface Plasmon Resonance

Zynio

Samoylov

Surovtseva

et al. 2002

Sensors

214

112

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Abstract:Two metals are used in resonant layers for chemical sensors based on surface plasmon resonance (SPR) -gold and silver. Gold displays higher shift of the resonance angle to changes of ambient refraction index and is chemically stable. Silver posses narrower resonance curve thus providing a higher signal/noise ratio of SPR chemical sensors, but has a poor chemical stability. A new structure of resonant metallic film based on bimetallic silver/gold layers (gold as an outer layer) is suggested. It combines advantages of both gold and silver resonant layers. Bimetallic resonant films display so high shift of resonance angle on changes of ambient refraction index as gold films, but show narrower resonance curve, thus providing a higher signal / noise ratio. Additionally, the outer gold layer protects silver against oxidation.

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“…The volume fraction and microstructure of the dispersed metal particles as well as the dielectric constant of the matrix glasses strongly affect the optical absorption of the composite thin films. A variety of techniques including melt quenching 1,2) ion implantation, [3][4][5] sol-gel [6][7][8][9][10][11] and sputtering [12][13][14][15][16] have been employed to fabricate Au/SiO 2 composite thin films. In order to increase the optical absorption of the composite thin films, the content of metal particles should be increased as high as possible.…”

Section: Introductionmentioning

confidence: 99%

Optical Properties of Au/SiO2 Nano-Composite Films Prepared by Induction-Coil-Coupled Plasma Sputtering

et al. 2003

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Au/SiO 2 nano-composite thin films with 3 to 65 vol% Au were prepared by induction-coil-coupled plasma sputtering, and the effect of heat-treatment on the nano-structure and optical property of the films were investigated. The mean diameter of the Au particles in the asdeposited films was about 8 nm and increased from 10 to 30 nm after the heat treatments at 900 C. The optical absorption was greatly improved by the heat-treatment due to the increase of Au particle sizes. At the heat-treatment of 900 C, Au/SiO 2 films containing 3 to 65 vol% Au showed absorption peaks at the wavelength of 540 to 560 nm, while no absorption peak was observed in the as-deposited films containing more than 12 vol% Au. The intensity of the absorption peak for the Au/SiO 2 films heat treated at 900 C increased with increasing Au content, showing a maximum value around the Au content of 37 vol%.

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Surface effect on the size evolution of surface plasmon resonances of Ag and Au nanoparticles dispersed within mesoporous silica

Cited by 55 publications

References 24 publications

Preparation of Au/SiO<SUB>2</SUB> Nano-Composite Multilayers by Helicon Plasma Sputtering and Their Optical Properties

Preparation of Au/SiO<SUB>2</SUB> Nano-Composite Multilayers by Helicon Plasma Sputtering and Their Optical Properties

Bimetallic Layers Increase Sensitivity of Affinity Sensors Based on Surface Plasmon Resonance

Optical Properties of Au/SiO<SUB>2</SUB> Nano-Composite Films Prepared by Induction-Coil-Coupled Plasma Sputtering

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