Annealing effect on the structural and optical properties of embedded Au nanoparticles in silicon suboxide films

Chan, K. K.; Goh, Boon Tong; Rahman, Saadah Abdul; Muhamad, Muhamad Rasat; Dee, Chang Fu; Aspanut, Zarina

doi:10.1016/j.vacuum.2012.01.005

Cited by 25 publications

(10 citation statements)

References 42 publications

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“…2.b) showed the uniform distribution of the grains with the presence of a few bright elongated shape particles on the surface of the film. The earlier reports agrees the above observation [20][21][22][23]. As the Au dopant increases to 8 and 12 Mol% (Fig.…”

Section: Table1supporting

confidence: 89%

“…The size of ionic Au is large (ionic radius1.37 Å and 1.44 Å for Au þ and Au°), compared to ionic Zr (ionic radius 0.80 Å for Zr 4 þ ) and it is difficult to replace the Au þ and Au 0 with Zr 4 þ . When the film is annealed at 500°C, the Au particles were diffused towards the surface of the films because of low chemical affinity between the host and the Au atoms [20][21][22][23]. Fig.…”

Section: Structural Studiesmentioning

confidence: 99%

“…Increasing the Au concentration will shift the gold reduction equilibrium toward the formation of metallic gold and will decrease the solubility of gold species [17]. Hence, as the gold dopant increases, the Au NPs get retained on the surface and aggregate, due to the higher kinetic energy and mobility at 500°C [22,23]. Moreover, the addition of Au suppresses the growth of ZrO 2 grains.…”

Section: Table1mentioning

confidence: 99%

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Optical enhancement of Au doped ZrO2 thin films by sol–gel dip coating method

Berlin¹,

Joy²

2015

Physica B: Condensed Matter

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Section: Table1supporting

confidence: 89%

Section: Structural Studiesmentioning

confidence: 99%

Section: Table1mentioning

confidence: 99%

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Optical enhancement of Au doped ZrO2 thin films by sol–gel dip coating method

Berlin¹,

Joy²

2015

Physica B: Condensed Matter

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“…We suggested that the origin of this band comes from the exciting laser that penetrated through the porous layer and directly exciting throughout AuNPs. Optical coupling between them is claimed to govern the observed behavior [19,20]. Meanwhile, the sample deposited with 3.5 mA/cm 2 (sample c) had almost no PL peak that it is not included in the figure.…”

Section: Resultsmentioning

confidence: 99%

Optical absorption and photoluminescence studies of gold nanoparticles deposited on porous silicon

et al. 2013

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We present an investigation on a coupled system consists of gold nanoparticles and silicon nanocrystals. Gold nanoparticles (AuNPs) embedded into porous silicon (PSi) were prepared using the electrochemical deposition method. Scanning electron microscope images and energy-dispersive X-ray results indicated that the growth of AuNPs on PSi varies with current density. X-ray diffraction analysis showed the presence of cubic gold phases with crystallite sizes around 40 to 58 nm. Size dependence on the plasmon absorption was studied from nanoparticles with various sizes. Comparison with the reference sample, PSi without AuNP deposition, showed a significant blueshift with decreasing AuNP size which was explained in terms of optical coupling between PSi and AuNPs within the pores featuring localized plasmon resonances.

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“…Anderson localization is responsible for enhancing the localized field, and hence, it appears in the PL emission [43]. The localized enhanced field gives rise to a PL emission in which the peak is greatly dependent on the size and shape of the AuNPs [44]. The blue shift observed in the peak position in Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of Anderson localization on light emission from gold nanoparticle aggregates

Abdellatif

Salerno

Abdelrasoul

et al. 2016

Beilstein J. Nanotechnol.

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The localization of light known as Anderson localization is a common phenomenon characterizing aggregates of metallic nanostructures. The electromagnetic energy of visible light can be localized inside nanostructures below the diffraction limit by converting the optical modes into nonradiative surface plasmon resonances. The energy of the confined photons is correlated to the size and shape of the nanostructured system. In this work, we studied the photoluminescence dependence of aggregates of 14 nm diameter gold nanoparticles (AuNPs) synthesized by drop-casting a liquid suspension on two different substrates of glass and quartz. The AuNP aggregates were characterized by electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The dielectric constant of the surrounding medium plays a crucial role in determining the aggregate geometry, which affects the Anderson localization of light in the aggregates and hence causes a red-shift in the plasmonic resonance and in the photoluminescence emission. The geometry of the gold nanoparticle aggregates determine the strength of the Anderson localization, and hence, the light emission from the aggregates. The photoluminescence lifetime was found to be dependent on the AuNP aggregate geometry and the dielectric constant of the medium.

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Annealing effect on the structural and optical properties of embedded Au nanoparticles in silicon suboxide films

Cited by 25 publications

References 42 publications

Optical enhancement of Au doped ZrO2 thin films by sol–gel dip coating method

Optical enhancement of Au doped ZrO2 thin films by sol–gel dip coating method

Optical absorption and photoluminescence studies of gold nanoparticles deposited on porous silicon

Effect of Anderson localization on light emission from gold nanoparticle aggregates

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