Oxygen Content-Controllable Synthesis of Non-Stoichiometric Silicon Suboxide Nanoparticles by Electrochemical Anodization

Abstract

A facile route to producing non-stoichiometric silicon suboxide nanoparticles (SiOx NPs, 0 x NPs. The difference in ion mobility between oxygen species (O2− and OH−), formed during anodization, causes the production of non-stoichiometric SiOx on the surface of the Si while, simultaneously, fluoride ions in the electrolyte solution etch the formed SiOx layer, generating NPs under the intense electric field. The adjustment of the applied voltage and anodization temperature alters the oxygen content and the size of the SiOx NPs, respectively, allowing the characteristics of the NPs to be readily controlled. The proposed approach can be applied for mass production of SiOx NPs and is highly promising in the field of batteries and optoelectronics.

Keywords

• nanoparticle
• silicon suboxide
• anodization
• oxygen content