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Son, Jae Sung
Nanomaterials Science and Engineering Lab (NSE)
Research Interests
  • Nanoparticle, 3D printing, Thermoelectrics, Electronics

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Synthesis of Uniform Hollow Oxide Nanoparticles through Nanoscale Acid Etching

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Title
Synthesis of Uniform Hollow Oxide Nanoparticles through Nanoscale Acid Etching
Author
An, KwangjinKwon, Soon GuPark, MihyunNa, Hyon BinBaik, Sung-IlYu, Jung HoKim, DokyoonSon, Jae SungKim, Young WoonSong, In ChanMoon, Woo KyungPark, Hyun MinHyeon, Taeghwan
Issue Date
2008-12
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.8, no.12, pp.4252 - 4258
Abstract
We synthesized various hollow oxide nanoparticles from as-prepared MnO and iron oxide nanocrystals. Heating metal oxide nanocrystals dispersed in technical grade trioctylphosphine oxide (TOPO) at 300 °C for hours yielded hollow nanoparticles retaining the size and shape uniformity of the original nanocrystals. The method was highly reproducible and could be generalized to synthesize hollow oxide nanoparticles of various sizes, shapes, and compositions. Control experiments revealed that the impurities in technical grade TOPO, especially alkylphosphonic acid, were responsible for the etching of metal oxide nanocrystals to the hollow structures. Elemental mapping analysis revealed that the inward diffusion of phosphorus and the outward diffusion of metal took place in the intermediate stages during the etching process. The elemental analysis using XPS, EELS, and EDX showed that the hollow nanoparticles were amorphous metal oxides containing significant amount of phosphorus. The hollow nanoparticles synthesized from MnO and iron oxide nanocrystals were paramagnetic at room temperature and when dispersed in water showed spin relaxation enhancement effect for magnetic resonance imaging (MRI). Because of their morphology and magnetic property, the hollow nanoparticles would be utilized for multifunctional biomedical applications such as the drug delivery vehicles and the MRI contrast agents.
URI
https://scholarworks.unist.ac.kr/handle/201301/9731
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=61649128006
DOI
10.1021/nl8019467
ISSN
1530-6984
Appears in Collections:
MSE_Journal Papers
ECHE_Journal Papers
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