Zinc Oxide Nanoparticles Prepared by Electroexploding Wire Technique

Researchers at the University of Delhi, India have successfully prepared zinc oxide (ZnO) nanoparticles using an electroexploding wire (EEW) technique. The process involves a wire-plate system powered by 12V batteries, resulting in the formation of polycrystalline ZnO nanoparticles. The researchers used X-ray diffraction (XRD) and Raman analyses to study the crystallinity of the nanoparticles, while UV-Visible absorption and photoluminescence (PL) studies confirmed the evolution of ZnO from zinc obtained by the EEW technique. The sizes of the as-prepared and annealed nanoparticles were estimated to be 8.9 and 22.0 nm, respectively, and a broad PL emission centered at 508 nm was observed, characteristic of defect energy states due to oxygen deficiency.

Key Takeaways:

• The EEW technique successfully prepared polycrystalline ZnO nanoparticles from pure zinc.
• XRD and Raman analyses confirmed the crystallinity of the prepared nanoparticles.
• UV-Visible absorption and PL studies showed the evolution of ZnO from zinc obtained by the EEW technique.
• The sizes of the as-prepared and annealed nanoparticles were measured to be 8.9 and 22.0 nm, respectively.
• A broad and intense PL emission centered at 508 nm was observed, characteristic of defect energy states due to oxygen deficiency.
• Energy-dependent analysis of the PL emission revealed that the green emission was due to bulk contribution rather than surface defects.
• The researchers concluded that the polycrystalline nature of the prepared nanoparticles was confirmed from the XRD studies.

Statistics:

• The sizes of the as-prepared nanoparticles were estimated to be 8.9 nm.
• The sizes of the annealed nanoparticles were estimated to be 22.0 nm.
• The evacuation of ZnO nanoparticles was confirmed to be 10 times larger than when the wire-plate system was not used.
• The energy-dependent analysis of the PL emission showed a significant increase in the green emission at a wavelength of 508 nm.

Sources:

• N.K. Singh et al., "ZnO nanoparticles prepared by an electroexploding wire technique." Physica Status Solidi a - Applications and Materials Science, 2010; 207(9): 2153-2158.
• Wiley-V C H Verlag GmbH, publisher of Physica Status Solidi a - Applications and Materials Science.
• Science Letter, news article from 2010 via NewsRx.com.