Preparation and Optical Properties of Isopropanol Suspensions of Aluminum Nanoparticles

Ramanenka, A. A.; Лизунова, А. А.; Mazharenko, A. K.; Kerechanina, M. F.; Иванов, В. В.; Гапоненко, С. В.

doi:10.1007/s10812-020-01051-w

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…According to electron microscopy analysis (Figure 1) none of the obtained samples is monodisperse; all five samples contain particles in a rather wide rage. In particular, germanium particles with sizes from 2 to 37 nm exist in the sample prepared at 25 • C, while particles with 6 to 60 nm diameters occur in the material produced at 475 • C, whereas particles with diameters from 14 to 170 nm were found in the sample sintered at 775 • C. We suggest that the discrepancy in optical absorbance appears to be due to a different size distribution of the germanium nanoparticles in different samples, as it has been shown for plasmon resonance peak shape transformation for polydisperse aluminum nanoparticles [31]. According to the Mie theory, the extinction cross-section could be presented as a sum of multipole harmonic series [32,33].…”

Section: Absorption Measurements and Simulationsmentioning

confidence: 49%

Effects of Temperature on the Morphology and Optical Properties of Spark Discharge Germanium Nanoparticles

et al. 2020

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We report the spark discharge synthesis of aerosol germanium nanoparticles followed by sintering in a tube furnace at different temperatures varying from 25 to 800 °C. The size, structure, chemical composition and optical properties were studied. We have demonstrated a melting mechanism of nanoparticles agglomerates, the growth of the mean primary particle size from 7 to 51 nm and the reduction of the size of agglomerates with a temperature increase. According to transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) data, primary nanoparticles sintered at temperatures from 25 to 475 °C basically have a structure of Ge crystals embedded in a GeOx amorphous matrix, as well as visible photoluminescence (PL) with the maximum at 550 nm. Pure germanium nanoparticles are prepared at temperatures above 625 °C and distinguished by their absence of visible PL. The shape of the experimental UV-vis-NIR extinction spectra significantly depends on the size distribution of the germanium crystals. This fact was confirmed by simulations according to Mie theory for obtained ensembles of germanium nanoparticles.

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Section: Absorption Measurements and Simulationsmentioning

confidence: 49%

Effects of Temperature on the Morphology and Optical Properties of Spark Discharge Germanium Nanoparticles

et al. 2020

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“…It is almost impossible to separate the influence of one property from another. It is known that increases in the particle size, shell thickness, and nanoparticle agglomeration lead to a red shift in the particles’ absorption [ 78 , 79 , 80 , 81 ]. On the other hand, the enlargement of the particle size distribution of metal and semiconductor nanoparticles can result in the appearance of additional peaks in the longer wavelength region and the broadening of available ones [ 51 , 81 ].…”

Section: Resultsmentioning

confidence: 99%

Spark Discharge Synthesis and Characterization of Ge/Sn Janus Nanoparticles

et al. 2023

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Germanium–tin nanoparticles are promising materials for near- and mid-infrared photonics thanks to their tunable optical properties and compatibility with silicon technology. This work proposes modifying the spark discharge method to produce Ge/Sn aerosol nanoparticles during the simultaneous erosion of germanium and tin electrodes. Since tin and germanium have a significant difference in the potential for electrical erosion, an electrical circuit damped for one period was developed to ensure the synthesis of Ge/Sn nanoparticles consisting of independent germanium and tin crystals of different sizes, with the ratio of the atomic fraction of tin to germanium varying from 0.08 ± 0.03 to 0.24 ± 0.07. We investigated the elemental and phase composition, size, morphology, and Raman and absorbance spectra of the nanoparticles synthesized under different inter-electrode gap voltages and the presence of additional thermal treatment directly in a gas flow at 750 °C. The research shows that the in-flow thermal treatment of aerosol-agglomerated nanoparticles produced special individual bicrystalline Janus Ge/Sn nanoparticles with an average size of 27 nm and a decreasing absorption function with a changing slope at 700 nm.

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“…The phenomenon of plasmon enhancement of a signal is used both in the SERS method and in metal-enhanced fluorescence (MEF) applications [ 24 , 25 ]. Several research groups have shown an increase of up to 10 times in the luminescence of zinc oxide near aluminum nanoparticles [ 26 ], which is characterized by localized surface plasmon resonance in the ultraviolet range [ 27 , 28 ]. It was shown that gold nanorods, bowties, and substrates with suspended WSe2 flakes gave the enhanced fluorescence of a weak emitter up to 1400-fold, while silicon dimers and dielectric nanoparticles have also been used as antennas in which a 270-fold fluorescence enhancement was achieved [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Aerosol Dry Printing for SERS and Photoluminescence-Active Gold Nanostructures Preparation for Detection of Traces in Dye Mixtures

et al. 2022

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We proposed a novel method of nanostructure preparation for observation of surface-enhanced Raman spectroscopy (SERS) and metal-enhanced fluorescence (MEF) based on the deposition of gold nanoparticles (GNPs) above the thin dye film by dry aerosol printing. We detected various enhanced SERS and MEF signals of films of malachite green (MG) and rhodamine B (RhB) mixtures, depending on the surface packing density of Au NPs on the strip, and found the optimum one to achieve the 3.5 × 105 SERS enhancement. It was shown that statistical methods of chemometrics such as projection on latent structures provided the opportunity to distinguish SERS of MG from 100 ppm RhB in a mixture, whereas separation of MEF signals are feasible even for a mixture of MG and 1 ppm RhB due to two-photon excitation.

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Preparation and Optical Properties of Isopropanol Suspensions of Aluminum Nanoparticles

Cited by 8 publications

References 22 publications

Effects of Temperature on the Morphology and Optical Properties of Spark Discharge Germanium Nanoparticles

Effects of Temperature on the Morphology and Optical Properties of Spark Discharge Germanium Nanoparticles

Spark Discharge Synthesis and Characterization of Ge/Sn Janus Nanoparticles

Aerosol Dry Printing for SERS and Photoluminescence-Active Gold Nanostructures Preparation for Detection of Traces in Dye Mixtures

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