Publications

Detailed Information

Synthesis of uniform hollow oxide nanoparticles through nanoscale acid etching

Cited 198 time in Web of Science Cited 204 time in Scopus
Authors

An, Kwangjin; Kwon, Soon Gu; Park, Mihyun; Na, Hyon Bin; Baik, Sung-Il; Yu, Jung Ho; Kim, Dokyoon; Son, Jae Sung; Kim, Young Woon; Song, In Chan; Moon, Woo Kyung; Park, Hyun Min; Hyeon, Taeghwan

Issue Date
2008-12
Publisher
American Chemical Society
Citation
Nano Letters, Vol.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 degrees 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.
ISSN
1530-6984
URI
https://hdl.handle.net/10371/165869
DOI
https://doi.org/10.1021/nl8019467
Files in This Item:
There are no files associated with this item.
Appears in Collections:

Altmetrics

Item View & Download Count

  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Share