Publication: Silicon nanoparticles synthesized via chemical etching of silicon powder
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Date
2009-05-01
Authors
Low, Chia Wah
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Abstract
Silicon nanoparticles were successfully synthesized by chemical etching. In this process, bulk silicon powder was etched by etching solution consist of HF, HNO3 and CH3COOH with different concentration to produce silicon nanoparticles. In order to avoid agglomeration, silicon nanoparticles were dispersed in methanol, ethanol, 2-propanol and 1-butanol. A series of SEM observation show decreasing in size of silicon nanoparticles when concentration of HF/HNO3 is increase. The result also indicates that nanoparticles are well dispersed in ethanol but not in other alcohol. Ultraviolet-Visible Spectrophotometer was used to analyze the optical properties of silicon nanoparticles. The silicon nanoparticles show absorption edge at 325 nm. The silicon nanoparticles have the bandgap energy of 3.8 – 3.85 eV for direct transition and 1.1 – 1.2 eV for indirect transition