Structural investigations of picosecond laser ablated GaAs nanoparticles in different liquids
| Autor: | S. Venugopal Rao, S. V. S. Nageswara Rao, A. Mangababu, B. Chandu, G. Sarang Dev, Moram Sree Satya Bharati |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Chloroform Laser ablation Materials science Drop (liquid) Analytical chemistry Nanoparticle 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Gallium arsenide chemistry.chemical_compound symbols.namesake chemistry 0103 physical sciences symbols General Materials Science Physical and Theoretical Chemistry Selected area diffraction 0210 nano-technology Spectroscopy Raman spectroscopy |
| Zdroj: | Nano-Structures & Nano-Objects. 23:100509 |
| ISSN: | 2352-507X |
| Popis: | Gallium Arsenide substrates were ablated using ∼ 30 picosecond laser pulses in different liquid media. The experiments were performed in different solvents such as distilled water (DW), ethanol, toluene, and chloroform. The produced samples contained both particle-like and mesh-like structures. It was observed from the field emission scanning electron microscopy (FESEM) and energy dispersive X-ray spectroscopy (EDS) data that the particle-like structures were rich in Ga and As and mesh like structures were rich in Ga and O. It was also observed that micron-sized hexagonal, pentagonal, and cuboid crystals were formed in a few places of the sample, which had a composition of As and O only. The Raman spectra confirmed the presence of β -Ga2O3 as a major phase in colloidal solution produced in DW. Further, the Raman data also confirmed the formation of GaAs and As2O3 as major phases for the NPs obtained in the ethanol and chloroform. However, in the case of toluene GaAs and GaO phases were observed from EDS and selected area electron diffraction (SAED) analyses. In order to investigate the reasons behind the formation of As2O3 particles, the sample solutions were drop casted onto the Si substrates and were heated to different temperatures. At higher temperatures, uniformly distributed As2O3 particles with different structures such as hexagon, pentagon, and cuboid were observed. Non-equilibrium, exotic and high-pressure phases of technologically important nanoparticles were formed by laser ablation of GaAs in liquid media. |
| Databáze: | OpenAIRE |
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