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Molecular-Level Understanding of Continuous Growth from Iron-Oxo Clusters to Iron Oxide Nanoparticles

Cited 7 time in Web of Science Cited 6 time in Scopus
Authors
Chang, Hogeun; Kim, Byung Hyo; Jeong, Hu Young; Moon, Jeong Hee; Park, Minwoo; Shin, Kwangsoo; Chae, Sue In; Lee, Jisoo; Kang, Taegyu; Choi, Back Kyu; Yang, Jiwoong; Bootharaju, Megalamane S.; Song, Hyoin; An, Seong Hee; Park, Kyung Man; Oh, Joo Yeon; Lee, Hoonkyung; Kim, Myung Soo; Park, Jungwon; Hyeon, Taeghwan
Issue Date
2019-05
Citation
Journal of the American Chemical Society, Vol.141 No.17, pp.7037-7045
Abstract
The formation of inorganic nanoparticles has been understood based on the classical crystallization theory described by a burst of nucleation, where surface energy is known to play a critical role, and a diffusion-controlled growth process. However, this nucleation and growth model may not be universally applicable to the entire nanoparticle systems because different precursors and surface ligands are used during their synthesis. Their intrinsic chemical reactivity can lead to a formation pathway that deviates from a classical nucleation and growth model. The formation of metal oxide nanoparticles is one such case because of several distinct chemical aspects during their synthesis. Typical carboxylate surface ligands, which are often employed in the synthesis of oxide nanoparticles, tend to continuously remain on the surface of the nanoparticles throughout the growth process. They can also act as an oxygen source during the growth of metal oxide nanoparticles. Carboxylates are prone to chemical reactions with different chemical species in the synthesis such as alcohol or amine. Such reactions can frequently leave reactive hydroxyl groups on the surface. Herein, we track the entire growth process of iron oxide nanoparticles synthesized from conventional iron precursors, iron-oleate complexes, with strongly chelating carboxylate moieties. Mass spectrometry studies reveal that the iron-oleate precursor is a cluster comprising a tri-iron-oxo core and carboxylate ligands rather than a mononuclear complex. A combinatorial analysis shows that the entire growth, regulated by organic reactions of chelating ligands, is continuous without a discrete nucleation step.
ISSN
0002-7863
URI
http://hdl.handle.net/10371/165801
DOI
https://doi.org/10.1021/jacs.9b01670
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Chemical Convergence for Energy and Environment (에너지환경 화학융합기술전공)Journal Papers (저널논문_에너지환경 화학융합기술전공)
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