Journal ArticleDOI
Morphological, optical and Raman characteristics of ZnO nanoflakes prepared via a sol-gel method
Muhammad Kashif,Syed M. Usman Ali,Syed M. Usman Ali,Md. Eaqub Ali,H.I. Abdulgafour,Uda Hashim,Magnus Willander,Zainuriah Hassan +7 more
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TLDR
In this paper, the surface morphologies of ZnO nanoflakes at different precursor concentrations were studied using scanning electron microscopy (SEM) and combined studies of SEM, photoluminescence (PL), and Raman spectroscopy suggested that nanorods started to grow along with nanofsakes at a precursor concentration of 0.05 M and the density of the nanors significantly increased when the concentration was raised to 0.075 M.Abstract:
Two-dimensional (2D) ZnO nanoflakes were grown on thin aluminum layer, deposited on silicon substrate, using a sol-gel method. The surface morphologies of ZnO nanoflakes at different precursor concentrations were studied using scanning electron microscopy (SEM). Combined studies of SEM, photoluminescence (PL), and Raman spectroscopy suggested that nanorods started to grow along with nanoflakes at a precursor concentration of 0.05 M and the density of the nanorods significantly increased when the concentration was raised to 0.075 M. Both the UV-luminescence and Raman spectra were intensified and redshifted with the increment of precursor concentration. Spectral intensification suggests improvement in crystal qualities and better optical properties of the fabricated ZnO nanostructures. The structural defects at lower levels of precursor were probably due to the hypoxic environment, whereas, the redshift of PL and Raman spectra was due to the local heating of ZnO nanocrystals.read more
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Band gap engineered zinc oxide nanostructures via a sol–gel synthesis of solvent driven shape-controlled crystal growth
TL;DR: In this paper, a reliable sol-gel approach, which combines the formation of ZnO nanocrystals and a solvent driven, shape-controlled, crystal growth process to form well-organized ZnOsO nanostructures at low temperature is presented.
Journal ArticleDOI
Sol–gel synthesized zinc oxide nanorods and their structural and optical investigation for optoelectronic application
TL;DR: The obtained X-ray diffraction patterns showed that the synthesized zinc oxide NRs were single crystals and exhibited a preferred orientation along the (002) plane, and the calculated results from the specific models of the refractive index are consistent with the experimental data.
Journal ArticleDOI
'Spotted Nanoflowers': Gold-seeded Zinc Oxide Nanohybrid for Selective Bio-capture.
Veeradasan Perumal,Uda Hashim,Subash C. B. Gopinath,R. Haarindraprasad,K. L. Foo,S. R. Balakrishnan,Prabakaran Poopalan +6 more
TL;DR: The created nanostructure hybrids illuminate the mechanism of generating multiple-target, high-performance detection on a single NF platform, which opens a new avenue for array-based medical diagnostics.
Journal ArticleDOI
Effect of different solvents on the structural and optical properties of zinc oxide thin films for optoelectronic applications
TL;DR: In this paper, the effect of different solvents on the structural and optical properties of ZnO thin films was investigated by field emission scanning electron microscopy (FESEM), atomic force microscopy and an ultraviolet-visible-near infrared spectrophotometer (UV-vis-NIR).
High-performance ethanol sensing based on an aligned assembly of ZnO nanorods. Sens Actuators B
TL;DR: In this article, the authors report fabrication and characterization of an ethanol sensor using aligned ZnO nanorods, which has an average diameter of 50nm and an average length of 0.5μm.
References
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Optically pumped lasing of ZnO at room temperature
TL;DR: In this paper, the authors reported the observation of optically pumped lasing in ZnO at room temperature using a plasma-enhanced molecular beam epitaxy on sapphire substrates.
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Green luminescent center in undoped zinc oxide films deposited on silicon substrates
Bixia Lin,Zhuxi Fu,Yunbo Jia +2 more
TL;DR: The photoluminescence (PL) spectra of undoped ZnO films deposited on Si substrates by dc reactive sputtering have been studied in this paper, where two emission peaks, centered at 3.18 eV and 2.38 eV, were found to correspond to oxide antisite defect OZn rather than oxygen vacancy VO, zinc vacancy VZn, interstitial zinc Zni, and interstitial oxygen Oi.
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Blue Luminescence of ZnO Nanoparticles Based on Non‐Equilibrium Processes: Defect Origins and Emission Controls
TL;DR: In this article, high concentrations of defects are introduced into nanoscale ZnO through non-equilibrium processes and resultant blue emissions are comprehensively analyzed, focusing on defect origins and broad controls.
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Optical properties of the ZnO nanotubes synthesized via vapor phase growth
Y. J. Xing,Z. H. Xi,Z.Q. Xue,Xiaodong Zhang,J. H. Song,Rongming Wang,Jianbin Xu,Yinglin Song,S. L. Zhang,Dapeng Yu +9 more
TL;DR: In this article, a large quantity of nanosized ZnO tubular structures was prepared using a very simple thermal evaporation of mixed Zn-ZnO powders under a wet oxidation condition.
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Micro-Raman investigation of optical phonons in ZnO nanocrystals
TL;DR: In this paper, the authors measured nonresonant and resonant Raman-scattering spectra from ZnO nanocrystals with an average diameter of 20nm.