Nanocomposite Thin Films Resulting from Au Nanoclusters Dispersed in Titanium Oxide Dielectric Matrixes: the Surface Plasmon Resonance Effect

Faro, Marc Torrell; Vasilevskiy, Mikhail; Cavaleiro, A.; Vaz, F.

doi:10.5772/18622

Cited by 3 publications

(4 citation statements)

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“…This parameter depends on the nanoparticle size and is directly associated to the width of a single localized plasmon resonance peak. For spherical Au nanoparticles, for example, the following expression [20] can be used…”

Section: Numerical Calculations and Discussionmentioning

confidence: 99%

“…For the geometrical factor, the value of g s ≈0.7 was used [20]. When choosing the values of dimensionless parameters, for definiteness, we assumed the resonant frequency corresponds to ℏω 0 =1 eV in Eq.…”

Section: Numerical Calculations and Discussionmentioning

confidence: 99%

“…Taking into account (20), the effective susceptibility of a single spherical particle of radius r p can be written as…”

Section: Models For Effective Susceptibilitiesmentioning

confidence: 99%

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Self-Consistent Approach to Calculation of the Optical Response and Absorption Profiles of Thin Nanocomposite Films

2015

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The absorption profiles for different nanocomposite thin films are calculated in the frame of approach based on a local-field method for calculations of optical properties of nanocomposite thin films having a matrix topology. The electrodynamic interactions between the inclusions as well as inclusions-matrix interactions are explicitly taken into account. It is shown that the absorption spectra are strongly dependent both on inclusions concentration and on materials the nanocomposite is made of. The dependences of the effective dielectric functions of different nanocomposites on type of inclusions, and their volume fraction are analyzed. The optical properties of thin nanocomposite films with different distributions of identical spherical inclusions along the film thickness are studied.

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Section: Numerical Calculations and Discussionmentioning

confidence: 99%

Section: Numerical Calculations and Discussionmentioning

confidence: 99%

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Self-Consistent Approach to Calculation of the Optical Response and Absorption Profiles of Thin Nanocomposite Films

2015

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“…However, these techniques reveal problems like high production cost or environmental problems [9,43]. In this field, some research has been done in magnetron sputtered thin films consisting of noble metal nanoparticles embedded in a dielectric matrix [44,45]. Changing the deposition parameters of these films, as well as the post-deposition thermal treatment conditions, allows to tune LSPR bands within the visible spectra by changing some nanostructural parameters (size, shape and distribution of the nanoparticles), the noble metal concentration, and also the dielectric matrix (usually an oxide) [46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Development of biocompatible plasmonic thin films composed of noble metal nanoparticles embedded in a dielectric matrix to enhance Raman signals

Costa

Oliveira

Rodrigues

et al. 2019

Applied Surface Science

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This work focused on the production of nanocomposite thin films, composed of noble nanoparticles embedded in a dielectric matrix, to be tested as biocompatible plasmonic platforms for detection of molecules using Surface Enhance Raman Spectroscopy (SERS). Three different thin films systems were deposited by reactive DC magnetron sputtering, namely Au-Al2O3, Au-TiO2 and Ag-TiO2. The depositions were followed by a thermal treatment at different temperatures to promote the growth of the nanoparticles. Localized Surface Plasmon Resonance (LSPR) bands appeared already at 300 ºC, related to the presence of Au nanoparticles, and at 500 ºC in the case of Ag nanoparticles. Furthermore, at 700º C, the Ag-TiO2 films showed a broadband optical response due to the formation of Ag clusters at the film's surface. The biological experiments showed that the presence of the thin films didn't affect the growth of C. albicans, which is very convenient if one needs to detect low concentrations of this microorganism using SERS platforms. As for the SERS 2 measurements, an enhancement of R6G Raman spectra intensity was clearly perceivable, but only for the TiO2 matrix. Furthermore, the application of a plasma treatment allowed to better expose the nanoparticles, providing a further enhancement of Raman signals.

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An Implementation of Gold Nanoparticles with Functionalized Surface in Biosensorics

Razumova

Lunha

Lozovski

2021

2021 IEEE 11th International Conference Nanomaterials: Applications &Amp; Properties (NAP)

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Nanocomposite Thin Films Resulting from Au Nanoclusters Dispersed in Titanium Oxide Dielectric Matrixes: the Surface Plasmon Resonance Effect

Cited by 3 publications

References 50 publications

Self-Consistent Approach to Calculation of the Optical Response and Absorption Profiles of Thin Nanocomposite Films

Self-Consistent Approach to Calculation of the Optical Response and Absorption Profiles of Thin Nanocomposite Films

Development of biocompatible plasmonic thin films composed of noble metal nanoparticles embedded in a dielectric matrix to enhance Raman signals

An Implementation of Gold Nanoparticles with Functionalized Surface in Biosensorics

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