An investigation into the influence of zinc precursor on the microstructural, photoluminescence, and gas-sensing properties of ZnO nanoparticles

Catto, Ariadne C.; Silva, Luís F.; Bernardi, Maria Inês Basso; Li, Máximo Siu; Longo, Elson; Lisboa‐Filho, Paulo Noronha; Nascimento, Otaciro Rangel; Mastelaro, Valmor Roberto

doi:10.1007/s11051-014-2760-0

Cited by 19 publications

(12 citation statements)

References 49 publications

(53 reference statements)

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“…[ [95][96][97][98][99] According to literature, the UV emission corresponds to a near band edge (NBE) transition, which is related to excitonic recombination caused by shallow donors inside the ZnO band-gap. [96,[100][101][102] The visible emission has been attributed to the presence intrinsic and extrinsic defects, and also adsorbed molecules on the ZnO surface.…”

Section: Photoluminescence (Pl) Spectroscopymentioning

confidence: 99%

The role of counter-ions in crystal morphology, surface structure and photocatalytic activity of ZnO crystals grown onto a substrate

Catto

Ferrer

Lopes

et al. 2020

Applied Surface Science

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In this contribution, we present an experimental and theoretical investigation of the role of counter-ions in the crystal morphology, surface structure, and photocatalytic activity of hierarchical ZnO nanostructures. The effect of zinc precursor (nitrate, acetate and, sulfate) along the synthesis of ZnO nanostructures grown directly onto a substrate by means of a simple hydrothermal method was analyzed in detail. Scanning electron microscopy images showed a preferential growth of ZnO nanostructures along the caxis, with a slight reduction in the orientation depending on the choice of the Zn source. 2 Theoretical calculations based on Wulff theory allowed us a better understanding of the morphological changes and to directly relate the photocatalytic performance at the different exposed surfaces of the as-observed crystal shapes. Our results showed that photocatalytic activities in the discoloration of organic dyes became superior for hierarchical ZnO nanostructures obtained from zinc nitrate. This finding was explained by X-ray photoelectron and photoluminescence spectroscopies, which revealed that the presence of surface defects, as well as the attached counter-ions and the abundance of carboxylate groups and organic residuals on ZnO surfaces are determinant for enhanced photocatalytic performance.

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Section: Photoluminescence (Pl) Spectroscopymentioning

confidence: 99%

The role of counter-ions in crystal morphology, surface structure and photocatalytic activity of ZnO crystals grown onto a substrate

Catto

Ferrer

Lopes

et al. 2020

Applied Surface Science

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“…To perform gas-sensing measurements, the samples were prepared following the procedure adopted by our group [2,20,21]. CuWO 4 nanoparticles were dispersed in isopropyl alcohol by an ultrasonic cleaner for 30 min, and the suspension was then dripped onto a SiO 2 /Si substrate with 120 nm thick Pt electrodes separated by a distance of 50 mm.…”

Section: Gas-sensing Measurementsmentioning

confidence: 99%

Improving the ozone gas-sensing properties of CuWO4 nanoparticles

Catto

Fiorido

Souza

et al. 2018

Journal of Alloys and Compounds

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This paper consists of an experimental investigation on the effects of annealing temperature on the structural, surface and ozone gas-sensing properties of CuWO 4 nanoparticles prepared via a sonochemical route. X-ray diffraction patterns and X-ray absorption near-edge structure spectroscopy revealed that both long-and short-order structures increase with the annealing temperature. Electrical resistance measurements indicated that CuWO 4 samples were sensitive in the range of 15e1400 ppb, exhibiting a good reversibility and repeatability. The enhancement of the ozone gas-sensing properties was attributed to the reduction of hydroxyl species and the improvement of the crystallization degree. This study provides a versatile strategy for obtaining CuWO 4 nanoparticles for practical applications as an ozone gas sensor.

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“…Our research group has previously investigated the photocatalytic, gas sensing and photoluminescent properties of the pure and doped SrTiO 3 compounds synthesized by different routes . Among these routes, the use of the polymeric precursor method to prepare oxide compounds has been considered a promising route because it offers interesting advantages such as good control of stoichiometry, easy reproducibility and mainly the possibility of obtaining nanometric particle sizes .…”

Section: Introductionmentioning

confidence: 99%

An Understanding of the Photocatalytic Properties and Pollutant Degradation Mechanism of SrTiO₃ Nanoparticles

Silva

Lopes

Mendonça

et al. 2016

Photochem & Photobiology

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Strontium titanate nanoparticles have attracted much attention due to their physical and chemical properties, especially as photocatalysts under ultraviolet irradiation. In this paper, we analyze the effect of heating rate during the crystallization process of SrTiO3 nanoparticles in the degradation of organic pollutants. The relationship between structural, morphological and photocatalytic properties of the SrTiO3 nanoparticles was investigated using different techniques. Transmission electron microscopy and N2 adsorption results show that particle size and surface properties are tuned by the heating rate of the SrTiO3 crystallization process. The SrTiO3 nanoparticles showed good photoactivity for the degradation of methylene blue, rhodamine B and methyl orange dyes, driven by a nonselective process. The SrTiO3 sample with the largest particle size exhibited higher photoactivity per unit area, independent of the molecule to be degraded. The results pointed out that the photodegradation of methylene blue dye catalyzed by SrTiO3 is caused by the action of valence band holes (direct pathway), and the indirect mechanism has a negligible effect, i.e. degradation by O2 (-•) and (•) OH radicals attack.

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An investigation into the influence of zinc precursor on the microstructural, photoluminescence, and gas-sensing properties of ZnO nanoparticles

Cited by 19 publications

References 49 publications

The role of counter-ions in crystal morphology, surface structure and photocatalytic activity of ZnO crystals grown onto a substrate

The role of counter-ions in crystal morphology, surface structure and photocatalytic activity of ZnO crystals grown onto a substrate

Improving the ozone gas-sensing properties of CuWO4 nanoparticles

An Understanding of the Photocatalytic Properties and Pollutant Degradation Mechanism of SrTiO₃ Nanoparticles

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An investigation into the influence of zinc precursor on the microstructural, photoluminescence, and gas-sensing properties of ZnO nanoparticles

Cited by 19 publications

References 49 publications

The role of counter-ions in crystal morphology, surface structure and photocatalytic activity of ZnO crystals grown onto a substrate

The role of counter-ions in crystal morphology, surface structure and photocatalytic activity of ZnO crystals grown onto a substrate

Improving the ozone gas-sensing properties of CuWO4 nanoparticles

An Understanding of the Photocatalytic Properties and Pollutant Degradation Mechanism of SrTiO3 Nanoparticles

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Product

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An Understanding of the Photocatalytic Properties and Pollutant Degradation Mechanism of SrTiO₃ Nanoparticles