Hollow Silicon Nanostructures via the Kirkendall Effect
- Hollow Silicon Nanostructures via the Kirkendall Effect
- 손윤국; 손연국; 최민; 고민성; 채수종; 박노정; 조재필
- Silicon; Nanostructures; kirkendall effect; First principles
- Issue Date
- Nano letters
- VOL 15, NO 10, 6914-6918
- The Kirkendall effect is a simple, novel phenomenon that may be applied for the synthesis of hollow nanostructures with designed pore structures and chemical composition. We demonstrate the use of the Kirkendall effect for silicon (Si) and germanium (Ge) nanowires (NWs) and nanopartides (NPs) via introduction of nanoscale surface layers of SiO2 and GeO2, respectively. Depending on the reaction time, Si and Ge atoms gradually diffuse outward through the oxide layers, with pore formation in the nanostnictural cores. Through the Kirkendall effect, NWs and NPs were transformed into nanotubes (NTs) and hollow NPs, respectively. The mechanism of the Kirkendall effect was studied via quantum molecular dynamics calculations. The hollow products demonstrated better electrochemical performance than their solid counterparts because the pores developed in the nanostructures resulted in lower external pressures during lithiation.
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