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Effect of particle size on iron nanoparticle oxidation state
- Source :
- Thin Solid Films. 520:2036-2040
- Publication Year :
- 2012
- Publisher :
- Elsevier BV, 2012.
-
Abstract
- Selecting catalyst particles is a very important part of carbon nanotube growth, although the properties of these nanoscale particles are unclear. In this article iron nanoparticles are analyzed through the use of atomic force microscopy and x-ray photoelectron spectroscopy in order to understand how the size affects the chemical composition of nanoparticles and thus their physical structure. Initially, atomic force microscopy was used to confirm the presence of iron particles, and to determine the average size of the particles. Next an analytical model was developed to estimate particle size as a function of deposition time using inputs from atomic force microscopy measurement. X-ray photoelectron spectroscopy analysis was then performed with a focus on the spectra relating to the 2p Fe electrons to study the chemical state of the particles as a function of time. It was shown that as the size of nanoparticles decreased, the oxidation state of the particles changed due to a high proportion of atoms on the surface.
- Subjects :
- Kelvin probe force microscope
Materials science
Metals and Alloys
Analytical chemistry
Nanoparticle
Surfaces and Interfaces
Electron
Carbon nanotube
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
law.invention
Chemical state
Deposition (aerosol physics)
Chemical engineering
X-ray photoelectron spectroscopy
law
Materials Chemistry
Particle size
Subjects
Details
- ISSN :
- 00406090
- Volume :
- 520
- Database :
- OpenAIRE
- Journal :
- Thin Solid Films
- Accession number :
- edsair.doi...........1c09fbba39d9ee157b782167858176c5