Synthesis, optical properties and growth mechanism of MnO nano structures

•First time MnO colloidal nanoparticles have been synthesized by pulse laser ablation.•Stability of colloidal nanoparticles observed by UV–vis absorption spectroscopy.•Growth mechanism proposed for different nanostructures. Manganese oxide (MnO) colloidal nanoparticles have been successfully synthes...

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Bibliographic Details
Published in:Applied surface science 2013-10, Vol.283, p.430-437
Main Authors: Pandey, B.K., Shahi, A.K., Gopal, R.
Format: Article
Language:English
Subjects:
Ablation
Colloidal particles
Colloids
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Mathematical analysis
MnO nanostructure
Nanoparticles
Nanostructure
Optical band gap
Optical properties
Particle shape
Physics
Pictures
Scanning electron microscopy
UV–vis absorption
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Summary:•First time MnO colloidal nanoparticles have been synthesized by pulse laser ablation.•Stability of colloidal nanoparticles observed by UV–vis absorption spectroscopy.•Growth mechanism proposed for different nanostructures. Manganese oxide (MnO) colloidal nanoparticles have been successfully synthesized by pulse laser ablation in double distilled water. Nd: YAG laser with focused output operating at different pulse energies (20, 30, 40, 50mJ/pulse) was used for ablation. Synthesized MnO nano crystal phase and structure were confirmed by X-ray diffraction and SAED pattern. Optical properties of as synthesized MnO nano colloidal solution were studied by UV–vis absorption spectroscopy. Optical particle size and band gap of as synthesized MnO colloidal nanoparticles were calculated. Particle shape and size were determined by TEM/SEM image. It is observed that MnO nano colloidal particles assembled to make different structures after aging in the liquid media. Aspect ratio has been calculated from SEM picture. MnO nanoparticles show weak antiferromagnetic behavior at room temperature as measured by VSM. A typical mechanism has been proposed for the formation of different nanostructures.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2013.06.126