Ultrasonic Influence on Plasmonic Effects Exhibited by Photoactive Bimetallic Au-Pt Nanoparticles Suspended in Ethanol

The optical behavior exhibited by bimetallic nanoparticles was analyzed by the influence of ultrasonic and nonlinear optical waves in propagation through the samples contained in an ethanol suspension. The Au-Pt nanoparticles were prepared by a sol-gel method. Optical characterization recorded by UV...

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Bibliographic Details
Published in:Materials 2019-06, Vol.12 (11), p.1791
Main Authors: Hurtado-Aviles, Eric Abraham, Torres, Jesús Alejandro, Trejo-Valdez, Martín, Torres-SanMiguel, Christopher René, Villalpando, Isaela, Torres-Torres, Carlos
Format: Article
Language:English
Subjects:
Acoustics
Acousto-optics
Acoustooptical devices
Attenuation
Bimetals
Destabilization
Electromagnetic absorption
Ethanol
Gold
Light
Morphology
Nanofluids
Nanoparticles
Nanosecond pulses
Nonlinear response
Optical communication
Optical properties
Optics
Perturbation
Platinum
Scanning transmission electron microscopy
Sensors
Signal processing
Sol-gel processes
Sound propagation
Sound waves
Surface plasmon resonance
Synergistic effect
Thin films
Transmission electron microscopy
Wave propagation
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Summary:The optical behavior exhibited by bimetallic nanoparticles was analyzed by the influence of ultrasonic and nonlinear optical waves in propagation through the samples contained in an ethanol suspension. The Au-Pt nanoparticles were prepared by a sol-gel method. Optical characterization recorded by UV-vis spectrophotometer shows two absorption peaks correlated to the synergistic effects of the bimetallic alloy. The structure and nanocrystalline nature of the samples were confirmed by Scanning Transmission Electron Microscopy with X-ray energy dispersive spectroscopy evaluations. The absorption of light associated with Surface Plasmon Resonance phenomena in the samples was modified by the dynamic influence of ultrasonic effects during the propagation of optical signals promoting nonlinear absorption and nonlinear refraction. The third-order nonlinear optical response of the nanoparticles dispersed in the ethanol-based fluid was explored by nanosecond pulses at 532 nm. The propagation of high-frequency sound waves through a nanofluid generates a destabilization in the distribution of the nanoparticles, avoiding possible agglomerations. Besides, the influence of mechanical perturbation, the container plays a major role in the resonance and attenuation effects. Ultrasound interactions together to nonlinear optical phenomena in nanofluids is a promising alternative field for a wide of applications for modulating quantum signals, sensors and acousto-optic devices.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma12111791