Large-scale synthesis of ultrathin manganese oxide nanoplates and their applications to T1 MRI contrast agents
- Authors
- 유승호
- Issue Date
- 7월-2011
- Publisher
- AMERICAN CHEMICAL SOCIETY
- Keywords
- contrast agent; magnetic resonance imaging; manganese oxide; nanoplates; pi-pi interactions
- Citation
- CHEMISTRY OF MATERIALS, v.23, no.14, pp.3318 - 3324
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMISTRY OF MATERIALS
- Volume
- 23
- Number
- 14
- Start Page
- 3318
- End Page
- 3324
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/140038
- DOI
- 10.1021/cm200414c
- ISSN
- 0897-4756
- Abstract
- Lamellar structured ultrathin manganese oxide nanoplates have been synthesized from thermal decomposition of manganese(II) acetylacetonate in the presence of 2,3-dihydroxynaphthalene, which promoted two-dimensional (2-D) growth by acting not only as a strongly binding surfactant but also as a structure-directing agent. Ultrathin manganese oxide nanoplates with a thickness of about 1 nm were assembled into a lamellar structure, and the width of the nanoplates could be controlled from 8 to 70 nm by using various coordinating solvents. X-ray absorption near-edge structure (XANES) spectra at the Mn K edge clearly showed that the nanoplates are mainly composed of Mn(II) species with octahedral symmetry. These hydrophobic manganese oxide nanoplates were ligand-exchanged with amine-terminated poly(ethyleneglycol) to generate water-dispersible nanoplates and applied to T1 contrast agents for magnetic resonance imaging (MRI). They exhibited a very high longitudinal relaxivity (r
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