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Park, Noejung
Computational Physics & Electronic Structure Lab
Research Interests
  • Electronic structure calculation, computational physics, computational material science

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Hollow Silicon Nanostructures via the Kirkendall Effect

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Title
Hollow Silicon Nanostructures via the Kirkendall Effect
Author
Son, YoonkookSon, YeongukChoi, MinKo, MinseongChae, SujongPark, NoejungCho, Jaephil
Issue Date
2015-10
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.15, no.10, pp.6914 - 6918
Abstract
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 nanoparticles (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 nanostructural 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.
URI
https://scholarworks.unist.ac.kr/handle/201301/17688
URL
http://pubs.acs.org/doi/10.1021/acs.nanolett.5b02842
DOI
10.1021/acs.nanolett.5b02842
ISSN
1530-6984
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PHY_Journal Papers
ECHE_Journal Papers
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