| Journal: | Brazilian journal of physics |
| Database: | PERIÓDICA |
| System number: | 000376097 |
| ISSN: | 0103-9733 |
| Authors: | Mardanian, Mehdi1 Tarasenko, Nikolai V1 Nevar, Alena1 |
| Institutions: | 1National Academy of Sciences of Belarus, B. I. Stefano Institute of Physics, Minsk. Bielorrusia |
| Year: | 2014 |
| Season: | Jun |
| Volumen: | 44 |
| Number: | 2-3 |
| Pages: | 240-246 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, analítico |
| English abstract | We have measured the size, structure, and optical properties for two sets of nanoparticles synthesized via electrical-spark discharge between two plane silicon electrodes immersed in deionized water (DI) and 97 % ethanol. The nanoparticles were characterized by X-ray diffraction (XRD), ultraviolet (UV)-visible absorption spectrometry, Raman spectrometry, transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FTIR). The size and optical features of the nanoparticles were studied as functions of nature of the liquid. Nearly spherical, single-crystal, and morphologically similar Si nanoparticles with diameters in the 3–8 and 6–13 nm ranges were formed in the colloidal solutions of water and ethanol, with estimated indirect bandgaps of approximately 1.5 and 1.3 eV, respectively. In both cases, the Raman peaks were blue shifted with respect to those of bulk silicon, a result consistent with the small diameters of the particles. The silicon nanoparticles synthesized in water exhibited strong emission in the violet-blue range, with a double peak near 417 and 439 nm. For those synthesized in ethanol, blue-green emission centered at 463 nm was detected |
| Disciplines: | Física y astronomía |
| Keyword: | Optica, Nanopartículas de silicón, Propiedades ópticas, Medio líquido |
| Keyword: | Physics and astronomy, Optics, Silicon nanoparticles, Optical properties, Liquid media |
| Full text: | Texto completo (Ver HTML) |
