Morphology control and optical properties of ZnO nanostructures grown by ultrasonic synthesis

Morales-Flores, N.; Galeazzi, R.; Rosendo, E.; Díaz, T.; Velumani, S.; Pal, Ujjwal

doi:10.12989/anr.2013.1.1.059

Cited by 13 publications

(11 citation statements)

References 40 publications

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“…6 represents the Raman spectrum of ZnO samples prepared at different reaction conditions. We observed a strong peak ∼370 cm −1 belonging to A 1 (Transverse-Optical, TO) with three additional small peaks located around 215, 263, 484 cm −1 indicating the presence of zinc hydroxide phase [37,38] in S-1 and S-2 samples. As the reaction continues the suppressed peak at ∼438 cm −1 of sample S-1 and S-2 gets sharper and stronger turning into a dominant peak in S-3 and S-4 samples, which is attributed to Raman-active E 2 (High) mode, the characteristic Raman band of hexagonal Wurtzite phase of ZnO [37][38][39].…”

Section: Raman and Electron Paramagnetic Resonance (Epr) Studiesmentioning

confidence: 76%

“…We observed a strong peak ∼370 cm −1 belonging to A 1 (Transverse-Optical, TO) with three additional small peaks located around 215, 263, 484 cm −1 indicating the presence of zinc hydroxide phase [37,38] in S-1 and S-2 samples. As the reaction continues the suppressed peak at ∼438 cm −1 of sample S-1 and S-2 gets sharper and stronger turning into a dominant peak in S-3 and S-4 samples, which is attributed to Raman-active E 2 (High) mode, the characteristic Raman band of hexagonal Wurtzite phase of ZnO [37][38][39]. The Raman spectrum of S-3 and S-4 samples also exhibited other characteristic bands at ∼331 cm −1 attributed to the 2-E 2 (M) modes and the peaks at ∼377 and 411 cm −1 assigned to the A 1 (Transverse-Optical, TO) and E 1 (Transverse-Optical, TO) mode respectively related to multiphonon process and also a plateau at 580 cm −1 assigned to the E 1 (Longitudinal Optical, LO) mode representing the scattering from defect levels and impurities present in the samples [39].…”

Section: Raman and Electron Paramagnetic Resonance (Epr) Studiesmentioning

confidence: 76%

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Solution grown ZnO rods: Synthesis, characterization and defect mediated photocatalytic activity

Mukhopadhyay

Das

Maity³

et al. 2015

Applied Catalysis B: Environmental

109

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Section: Raman and Electron Paramagnetic Resonance (Epr) Studiesmentioning

confidence: 76%

Section: Raman and Electron Paramagnetic Resonance (Epr) Studiesmentioning

confidence: 76%

Solution grown ZnO rods: Synthesis, characterization and defect mediated photocatalytic activity

Mukhopadhyay

Das

Maity³

et al. 2015

Applied Catalysis B: Environmental

109

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“…The differences in particle size and shape between the ZnO-st and ZnO-mw nanocrystals, cannot be appreciated in these spectra and the extracted band-gap values. In particular, the heterogeneity of size distribution observed for the ZnO-st NCs is still within a few nanometers, (i.e., from 6 to 20 nm, as estimated by FESEM) and the literature even do not report differences in UV-vis spectra from even broader sizes or shape variations in ZnO nanostructures [ 37 ].…”

Section: Resultsmentioning

confidence: 99%

A Microwave-Assisted Synthesis of Zinc Oxide Nanocrystals Finely Tuned for Biological Applications

et al. 2019

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Herein we report a novel, easy, fast and reliable microwave-assisted synthesis procedure for the preparation of colloidal zinc oxide nanocrystals (ZnO NCs) optimized for biological applications. ZnO NCs are also prepared by a conventional solvo-thermal approach and the properties of the two families of NCs are compared and discussed. All of the NCs are fully characterized in terms of morphological analysis, crystalline structure, chemical composition and optical properties, both as pristine nanomaterials or after amino-propyl group functionalization. Compared to the conventional approach, the novel microwave-derived ZnO NCs demonstrate outstanding colloidal stability in ethanol and water with long shelf-life. Furthermore, together with their more uniform size, shape and chemical surface properties, this long-term colloidal stability also contributes to the highly reproducible data in terms of biocompatibility. Actually, a significantly different biological behavior of the microwave-synthesized ZnO NCs is reported with respect to NCs prepared by the conventional synthesis procedure. In particular, consistent cytotoxicity and highly reproducible cell uptake toward KB cancer cells are measured with the use of microwave-synthesized ZnO NCs, in contrast to the non-reproducible and scattered data obtained with the conventionally-synthesized ones. Thus, we demonstrate how the synthetic route and, as a consequence, the control over all the nanomaterial properties are prominent points to be considered when dealing with the biological world for the achievement of reproducible and reliable results, and how the use of commercially-available and under-characterized nanomaterials should be discouraged in this view.

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“…These characteristics are responsible for the vast different properties presented by ZnO, such as piezoelectricity and spontaneous polarization, being a key factor in crystal growth and in defect generation [9]. Indeed, ZnO's chemical and physical properties are highly influenced by its size, shape, morphology, and crystallinity, as well as the solvents and precursors used to achieve the desired nanostructure [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…In terms of the substrate, hospital papers coming as coach rolls are widely used nowadays, and thus this approach can contribute to avoid proliferation of bacteria, while maintaining the low cost and abundancy aspects of the material. S. aureus are gram-positive abundant skin-colonizing bacteria and a very important cause of both nosocomial infections and community-associated skin infections [11]. The antibacterial activity of TiO 2 nanostructures grown on hospital paper (1 M, 15 min synthesis time) against this bacteria was quantitatively assessed accordingly to [7] A = log C T − log C 0 − log T T − log T 0 , 3…”

mentioning

confidence: 99%

Paper-Based Nanoplatforms for Multifunctional Applications

Matias

Nunes

Pimentel

et al. 2019

Journal of Nanomaterials

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In this work, zinc oxide (ZnO) and titanium dioxide (TiO 2 ) nanostructures were grown on different cellulose paper substrates, namely, Whatman, office, and commercial hospital papers, using a hydrothermal method assisted by microwave irradiation. Pure ZnO and TiO 2 nanostructures were synthesized; however, the growth of TiO 2 above ZnO was also investigated to produce a uniform heterostructure. Continuous ZnO nanorod arrays were grown on Whatman and hospital papers; however, on office paper, the formation of nanoplates originating nanoflower structures could be observed. TiO 2 nanoparticles homogeneously covered all the substrates, in some conditions forming uniform TiO 2 films. Structural characterization was carried out by scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and Raman spectroscopy. The optical characterization of all the materials was carried out. The produced materials were investigated for multifunctional applications, like photocatalyst agents, bacterial inactivators, and ultraviolet (UV) sensors. To evaluate the photocatalytic activity under UV and solar radiations, rhodamine B was the model-test contaminant indicator and the best photocatalytic activity was achieved with Whatman paper. Hospital paper with TiO 2 nanoparticles showed significant antibacterial properties against Staphylococcus aureus. ZnO-based UV sensors demonstrated a responsivity of 0.61 μA W -1 .

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Morphology control and optical properties of ZnO nanostructures grown by ultrasonic synthesis

Cited by 13 publications

References 40 publications

Solution grown ZnO rods: Synthesis, characterization and defect mediated photocatalytic activity

Solution grown ZnO rods: Synthesis, characterization and defect mediated photocatalytic activity

A Microwave-Assisted Synthesis of Zinc Oxide Nanocrystals Finely Tuned for Biological Applications

Paper-Based Nanoplatforms for Multifunctional Applications

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