| Structural and Optical Studies of ZnO Nanostructures
Synthesized by Rapid Microwave Assisted Hydrothermal
and Solvothermal Methods |
Bhuvanagiri Nageswara Rao,a Endu Sekhar Srinadhu,b Vallabhaneni Madhusudhanraoc
and Nallani Satyanarayanad,*
Pages : 169-174
DOI : 10.1080/0371750X.2018.1516574 |
| Abstract |
| We report the structural and optical studies of various morphologies of ZnO
nanostructured (nanoparticles and nanorods) samples synthesized at low
temperatures using novel microwave assisted hydrothermal and solvothermal
methods within a short time without any post heat treatment. The structural and
optical studies were carried out on as-synthesized ZnO samples using X-ray
diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning
electron microscopy (SEM), UV-visible spectroscopy and surface area analyzer
techniques. Powder XRD results confirmed the formation of phase pure hexagonal
crystal structured ZnO samples (S1, S2 and S3). Structural co-ordination of ZnO
samples (S1, S2 and S3) was confirmed from the FTIR results. SEM images showed
the formation of uniformly distributed ZnO nanoparticles (average particle size
~90 nm) and nanorods (average diameter ~100 nm, average length 0.3-1 m)
synthesized using facile microwave assisted hydrothermal and solvothermal
methods. UV-visible spectral results showed that ZnO nanorods exhibited higher
optical band gap than that of ZnO nanoparticles, which may be due to the one
dimensional morphology of ZnO nanorods. Surface area analysis of the samples
revealed that the small size crystallites exhibited high specific surface area.
[Keywords: ZnO nanostructures, Microwave synthesis, Dielectric heating,
Scanning electron microscopy, Optical properties] |
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