Elaboration and Characterization of Porous Silicon Nanowires Modified with Groups of CHx (PSiNWs/CHx) for Application Energy Storage

In this work, porous silicon nanowires of mesoporous types were developed by single-step metal-assisted chemical etching. These porous silicon nanowires have sufficient electronic conductivity along the longitudinal axis and can provide very high capacitance with the addition of carbon. The stability of porous silicon nanowires being the most difficult parameter to control during cycling, we opted for a new energy storage approach that consists of depositing a CHX hydrocarbon on the surface of the latter. The PSiNWs are covered with a CHX layer deposited by methane plasma created in a triode reactor at RF 13.5 MHZ, synchronized under an argon atmosphere on the surface of the porous silicon nanowires. The PSiNWs powder is recovered by ultrasound and then characterized by different characterization methods: FTIR, Ramon, BET, MEB and XPS. The morphological and structural characterization reveals that the powder of porous silicon nanowires modified by CHx can be used as an anode for lithium-ion batteries.