Room temperature optical and magnetic properties of polyvinylpyrrolidone capped ZnO nanoparticles

Journal Article · Tue Sep 15 04:00:00 EDT 2009 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2009.04.006· OSTI ID:22066129

Chakrabarti, Mahuya ^[1]; Das, S ^[2]; Chakrabarti, Keka R; Sanyal, D; Chakrabarti, A ^[1]

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1. Variable Energy Cyclotron Centre, 1/AF, Bidhannagar, Kolkata-700064 (India)
2. Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032 (India)

Defect induced room temperature ferromagnetic properties of polyvinylpyrrolidone (PVP) capped nanocrystalline ZnO samples have been studied. Crystal phase and the lattice parameter of the synthesized nanocrystalline samples have been determined from X-ray diffraction spectra (XRD) and high-resolution transmission electron micrographs (HR-TEM). Room temperature photoluminescence (PL) spectrum for the bare ZnO sample shows a strong band at {approx} 379 nm and another band at {approx} 525 nm. The PL spectra also revealed that the number of oxygen vacancies in the uncapped sample is more than the PVP capped sample. Both sample exhibit ferromagnetic property at room temperature when annealed at 500 deg. C for 3 h, due to the formation of adequate oxygen vacancy related defects. The saturation magnetization for the annealed PVP capped sample is found to be larger compared to that for the uncapped sample.

• OSTI ID: 22066129
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 9 Vol. 60; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ANNEALING
CRYSTALS
EMISSION SPECTRA
LATTICE PARAMETERS
MAGNETIC PROPERTIES
MAGNETIC SEMICONDUCTORS
MAGNETIZATION
NANOSTRUCTURES
OXYGEN
PARTICLES
PHOTOLUMINESCENCE
PVP
TEMPERATURE RANGE 0273-0400 K
VACANCIES
X-RAY DIFFRACTION
ZINC OXIDES