Tuning the surface plasmon resonance by preparation of gold-core/silver-shell and alloy nanoparticles

Hubenthal, Frank; Ziegler, Torsten; Hendrich, Christian; Alschinger, M.; Träger, F.

doi:10.1140/epjd/e2005-00138-1

Cited by 52 publications

(37 citation statements)

References 24 publications

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“…This property is well known as localized surface plasmon resonance (LSPR). So far, the plasmonic properties of gold (Au) and silver (Ag) NPs have been widely exploited 3 , but they are typically restricted to the infrared (IR) and visible regions 4 . In order to extend this spectral range to the ultraviolet (UV), some alternative materials such as magnesium, aluminum, indium and gallium (Ga) have been studied to have a strong resonance in this region 5 .…”

Section: Introductionmentioning

confidence: 99%

The role of the oxide shell in the chemical functionalization of plasmonic gallium nanoparticles

Catalán‐Gómez

Briones

Redondo-Cubero

et al. 2017

Optical Sensors 2017

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Plasmonic Ga nanoparticles (NPs) were thermally oxidized at low temperature in order to increase the native Ga 2 O 3 shell thickness and to improve their stability during the chemical functionalization. The optical, structural and chemical properties of the oxidized NPs have been studied by spectroscopic ellipsometry, scanning electron microscopy, grazing incidence X-ray diffraction and X-ray photoelectron spectroscopy. A clear redshift of the peak wavelength is observed with the increasing annealing time due to the Ga 2 O 3 thickness increase, and barely affecting the intensity of the plasmon resonance. This oxide layer enhances the stability of the NPs upon immersion in ethanol or water. The surface sensitivity properties of the as-grown and oxidized NPs were investigated by linking a thiol group from 6-Mercapto-1-hexanol through immersion. Ellipsometric spectra at the reversal polarization handedness (RPH) condition are in agreement with the Langmuir absorption model, indicating the formation of a thiol monolayer on the NPs.

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Section: Introductionmentioning

confidence: 99%

The role of the oxide shell in the chemical functionalization of plasmonic gallium nanoparticles

Catalán‐Gómez

Briones

Redondo-Cubero

et al. 2017

Optical Sensors 2017

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“…Bimetallic structures such as alloyed silver and gold nanoparticles have attractive catalytic, electronic, and optical properties that can vary with respect to size and composition of the different metals within the nanostructure [1][2][3]. Formation of Ag-Au alloy structures takes place by mixing them on atomic level without distinct phase boundaries [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of gold alloying on stability of silver nanoparticles and control of silver ion release from vapor-deposited Ag–Au/polytetrafluoroethylene nanocomposites

et al. 2012

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In the present study, nanocomposites containing Ag-Au alloy nanoparticle ensembles with various compositions on polytetrafluoroethylene were prepared by physical vapor deposition. After a certain time of immersion of the samples in water, oxidation and dissolution of the Ag nanoparticles (AgNPs) occurred, and changes in the morphology, optical properties and composition of the nanocomposites were examined using transmission electron microscopy, ultraviolet-visible spectroscopy and X-ray photoelectron spectroscopy (XPS), respectively. The composition-dependence and the time-dependence of the silver ion release were studied, and the concentration of the silver ions in water was detected using inductively coupled plasma mass spectrometry. The results indicate that with increasing gold fraction in the AuAg alloy nanoparticles, a strong improvement of the oxidation resistance of the AgNPs occurs. The dissolution of Ag is rapid at the first contact of the sample with water until a saturation state is reached. XPS synchrotron measurements with different excitation energies show that the depletion of Ag from the nanoparticles does not lead to the formation of a Au-rich shell and that the atomic mobility is high enough in the small nanoparticles of about 5 nm average size to equilibrate any concentration gradient.

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“…Afterwards several steps, including filtration, washing, drying and calcination are necessary to obtain the metallic products [20]. Dispersions and materials such as binary alloys, core/shell nanoparticles and nanorods in varying concentrations and with different metal content have already been synthesized and documented [20,[25][26][27][28][29][30][31]. Yet nanoparticle structures with a gold core and an alloyed gold-silver shell have not been synthesized.…”

Section: State Of the Artmentioning

confidence: 99%

“…This effect is known as the so-called surface plasmon resonance, an electronic interference of metal nanoparticles with electromagnetic radiation [29]. When the frequency of the incoming light couples with the oscillation of free conduction electrons, the condition for plasmon resonance is fulfilled and absorption occurs.…”

Section: Diffuse Reflectance Spectra (Drs)mentioning

confidence: 99%

Production of supported gold and gold–silver nanoparticles by supercritical fluid reactive deposition: Effect of substrate properties

Müller

Türk

2015

The Journal of Supercritical Fluids

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Tuning the surface plasmon resonance by preparation of gold-core/silver-shell and alloy nanoparticles

Cited by 52 publications

References 24 publications

The role of the oxide shell in the chemical functionalization of plasmonic gallium nanoparticles

The role of the oxide shell in the chemical functionalization of plasmonic gallium nanoparticles

Effect of gold alloying on stability of silver nanoparticles and control of silver ion release from vapor-deposited Ag–Au/polytetrafluoroethylene nanocomposites

Production of supported gold and gold–silver nanoparticles by supercritical fluid reactive deposition: Effect of substrate properties

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