Synthesis and characterization of colloidal gallium selenide nanowires

Balitskii, O.A.; Borowiak‐Palen, E.; Konicki, Wojciech

doi:10.1002/crat.201100017

Cited by 20 publications

(13 citation statements)

References 16 publications

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“…Transitions from parabolic to ring-shaped valence band maximum in few-layer GaS, GaSe, and InSe was reported 19 . More results concerning the properties of GaSe nanoaggregates may be found [20][21][22][23][24][25][26][27][28][29][30] . 4 for GaSe) and possible controlling mechanism were discussed by the authors 31 .…”

Section: Introductionmentioning

confidence: 99%

Linear and NLO spectroscopy of GaSe and InSe nanoparticles formed via laser ablation

et al. 2015

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Nanoparticles of layered GaSe, InSe were fabricated by laser ablation (LA) method (KrF laser, λ = 248 nm, 50 Hz, maximum energy 200 mJ, τ = 4 ns) and characterized by: •XRF; •GDOES; •SEM and TEM; •UV-, VIS-, and IRabsorption; •Raman and PL spectroscopy (also in confocal geometry). Results are discussed in relation to the particle size. Absorption spectra of particles with diameter 20 nm and less turned out to be blue shifted and is consisted with a weak confinement effect on Wannier-Mott type excitons. It is shown, that with decreasing the particle size the energy position of the low-frequency Raman active phonons in both compounds are shifted to lower frequencies (21 and 18 cm -1 in bulk GaSe and InSe and 8 and 7 cm -1 in particles with sizes 5 and 7 nm, respectively). From the low frequency Raman data, decrease of the force constants ca. 25 % (for GaSe) due to the formation of the nanoparticles are estimated, and the origin is suggested. Second harmonic generation (SHG) with 1064 nm line of a mode locked Nd : YAG laser was observed for nanoparticles ablated on different substrates. Potential for using these structures for laser light visualizators are discussed.

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Section: Introductionmentioning

confidence: 99%

Linear and NLO spectroscopy of GaSe and InSe nanoparticles formed via laser ablation

et al. 2015

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“…(A ) are consistent with the phonon vibration modes previously reported. 29 The peak located at 262.1 cm -1 comes from the underneath mica substrate.…”

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confidence: 99%

Arrayed van der Waals Vertical Heterostructures Based on 2D GaSe Grown by Molecular Beam Epitaxy

et al. 2015

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Vertically stacking two dimensional (2D) materials can enable the design of novel electronic and optoelectronic devices and realize complex functionality. However, the fabrication of such artificial heterostructures in wafer scale with an atomically-sharp interface poses an unprecedented challenge. Here, we demonstrate a convenient and controllable approach for the production of wafer-scale 2D GaSe thin films by molecular beam epitaxy. In-situ reflection high-energy electron diffraction oscillations and Raman spectroscopy reveal a layer-by-layer van der Waals epitaxial growth mode.Highly-efficient photodetector arrays were fabricated based on few-layer GaSe on Si.These photodiodes show steady rectifying characteristics and a high external quantum efficiency of 23.6%. The resultant photoresponse is super-fast and robust with a response time of 60 μs. Importantly, the device shows no sign of degradation after 1 million cycles of operation. We also carried out numerical simulations to understand the underlying device working principles. Our study establishes a new approach to produce controllable, robust and large-area 2D heterostructures and presents a crucial step for further practical applications.

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“…The use of nanofluids containing nanometer-sized particles in cooling systems of motors, generators, braking devices, heating, and ventilation can increase growth the heat transfer coefficient due to a magnification in the thermal conductivity coefficient. The large scatter of experimental data is associated with a number of objective reasons: the method of oxides, intermetallides, chalcogenides nanoparticle synthesis, the "heavy" nanoparticle size distribution function [17,22,23,25], the nanofluid preparation technology , as well as the method for measuring thermal conductivity and interpreting the results. In order to use nanofluids as a coolant, it is necessary to have information of their thermophysical properties.…”

Section: Literature Surveymentioning

confidence: 99%

Hydrogen Containing Nanofluids in the Spark Engine’s Cylinder Head Cooling System

et al. 2021

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The article is devoted to the following issues: boiling of fluid in the cooling jacket of the engine cylinder head; agents that influenced the thermal conductivity coefficient of nanofluids; behavior of nanoparticles and devices with nanoparticles in the engine’s cylinder head cooling system. The permissible temperature level of internal combustion engines is ensured by intensification of heat transfer in cooling systems due to the change of coolants with “light” and “heavy” nanoparticles. It was established that the introduction of “light” nanoparticles of aluminum oxide into the water in a mass concentration of 0.75% led to an increase in its thermal conductivity coefficient by 60% compared to the base fluid at a coolant temperature of 90 °C, which corresponds to the operating temperature of the engine cooling systems. At the indicated temperature, the base fluid has a thermal conductivity coefficient of 0.545 W/(m °С), for nanofluid with particles its value was 0.872 . At the same time, a positive change in the parameters of the nanofluid in the engine cooling system was noted: the average movement speed increased from 0.2 to 2.0 m/s; the average temperature is in the range of 60–90 °C; heat flux density 2 × 102–2 × 106 ; heat transfer coefficient 150–1000 . Growth of the thermal conductivity coefficient of the cooling nanofluid was achieved. This increase is determined by the change in the mass concentration of aluminum oxide nanoparticles in the base fluid. This will make it possible to create coolants with such thermophysical characteristics that are required to ensure intensive heat transfer in cooling systems of engines with various capacities.

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Synthesis and characterization of colloidal gallium selenide nanowires

Cited by 20 publications

References 16 publications

Linear and NLO spectroscopy of GaSe and InSe nanoparticles formed via laser ablation

Linear and NLO spectroscopy of GaSe and InSe nanoparticles formed via laser ablation

Arrayed van der Waals Vertical Heterostructures Based on 2D GaSe Grown by Molecular Beam Epitaxy

Hydrogen Containing Nanofluids in the Spark Engine’s Cylinder Head Cooling System

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