Effect of PSS on morphology and optical properties of ZnO

Wang, Yuanyuan; Chuan, Li; Liu, Shengwei

doi:10.1016/j.jcis.2008.07.052

Cited by 100 publications

(37 citation statements)

References 30 publications

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“…In addition, a blue shift was seen for products that could be due to changes in the morphologies, size, and surface microstructures of particles. Furthermore, the direct band gaps of samples estimated from a plot of (αhʋ) 2 versus the photo energy (hʋ) consistent with the Kubelka-Munk model (Yu et al 2008), shown in Figure 4b, were 3.40 eV, 3.32 eV, and 3.27 eV for samples 1, 2, and 3, respectively. Such an increase in the ZnO band gap energy is in good agreement with the corresponding blue shift observed in the UV absorption edge.…”

Section: Resultssupporting

confidence: 69%

Preparation, Characterization, and Antimicrobial Activities of ZnO Nanoparticles/Cellulose Nanocrystal Nanocomposites

Azizi¹,

Ahmad²,

Mahdavi³

et al. 2013

BioResources

119

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Zinc oxide (ZnO) nanoparticles were synthesized within cellulose nanocrystals (CNC) as a new stabilizer by a precipitation method for antimicrobial applications. For fabrication of ZnO/CNC nanocomposites, solutions with different molar ratios of Zn to CNC were prepared in ethanol as the solvent. ZnO/CNC was separated from the suspension and then dried at 120 °C for 1 hour. The nanocomposites were characterized using Fourier transform infrared (FTIR), ultraviolet-visible (UV-vis), X-ray diffraction (XRD), transmission electron microscope (TEM), and thermogravimetric (TG) analyses. According to the XRD and TEM results, the ZnO nanoparticles with a hexagonal wurtzite structure were easily prepared and dispersed in the CNC with an average size of less than 20 nm. The average size of the ZnO nanoparticles increased with increasing molar ratio of ZnO to CNC. The best ratio of Zn:CNC was chosen based on the small size of the ZnO nanoparticles that yielded better antimicrobial and thermal properties. The UV-vis absorption spectra of the ZnO/CNC nanocomposites showed absorption peaks in the UV region that were ascribed to the band gap of the ZnO nanoparticles. The antibacterial effects of ZnO/CNC were stronger compared to ZnO nanoparticles.

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Section: Resultssupporting

confidence: 69%

Preparation, Characterization, and Antimicrobial Activities of ZnO Nanoparticles/Cellulose Nanocrystal Nanocomposites

Azizi¹,

Ahmad²,

Mahdavi³

et al. 2013

BioResources

119

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“…It was found that the size of the ZnO particles was responsible for the change in band gap. Furthermore, it could be possible that band gap expansions resulted due to the electron transitions from the valence band to the conduction band (O 2p → Zn 3d ) [65]. In addition, a reverse relation between the band gap energy increase and the crystalline size decrease could be derived.…”

Section: Uv-vis Spectrophotometer Analysismentioning

confidence: 99%

Calcined Solution-Based PVP Influence on ZnO Semiconductor Nanoparticle Properties

et al. 2017

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Abstract:A water-based solution of polyvinylpyrrolidone (PVP) at various concentrations and zinc nitrates were used in conjunction with calcination to produce zinc oxide semiconductor nanoparticles. The extent to which the zinc oxide semiconductor nanoparticles had become crystallized was measured using X-ray diffraction (XRD), whilst morphological characteristics were determined using scanning electron microscopy (SEM). Transmission electron microscopy (TEM) supported by XRD results were used to evaluate the average particle size. Fourier transform infrared spectroscopy (FT-IR) was then carried out in order to identify the composition phase, since this suggested that the samples contained metal oxide bands and that all organic compounds had been effectively removed after calcination. A UV-VIS spectrophotometer was used to determine the energy band gap and illustrate optical features. Additionally, photoluminescence (PL) spectra revealed that the intensity of photoluminescence decreased with a decrease in particle size. The obtained results have mainly been inclusive for uses by several semiconductor applications in different fields, such as environmental applications and studies, since an absorption process for energy wavelengths could efficiently occur.

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“…All of P25/Zn0.15Cd0.85S nanocomposite with various P25 contents The UV-vis absorbance spectra of the pure CdS, Zn 0.15 Cd 0.85 S nanoflowers and P25/Zn 0.15 Cd 0.85 S nanocomposite are shown in Figure 3. The band gaps are calculated according to the Kubelka-Munk model [30] shown in Table 1. The absorption edge of pure CdS is at about 565 nm, with the corresponding band gap of 2.2 eV, which is slightly smaller than the value of 2.4 eV reported previously [31].…”

Section: Structure Morphology Surface and Spectroscopic Studiesmentioning

confidence: 99%

Surface Decorated Zn0.15Cd0.85S Nanoflowers with P25 for Enhanced Visible Light Driven Photocatalytic Degradation of Rh-B and Stability

2018

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Featured Application: P25/Zn 0.15 Cd 0.85 S nanocomposite possesses a great potential to be a green catalyst for the photolytic degradation of hazardous dyes due to its low cost, efficient reactivity and high stability. The prepared catalyst may further be used for the degradation of organic compound and toxic heavy metals.Abstract: Decoration of Zn 0.15 Cd 0.85 S nanoflowers with P25 for forming P25/Zn 0.15 Cd 0.85 S nanocomposite has been successfully synthesized with fine crystallinity by one-step low temperature hydrothermal method. Photocatalytic efficiency of the as-prepared P25/Zn 0.15 Cd 0.85 S for the degradation of Rh-B is evaluated under the visible light irradiation. The synthesized composite is completely characterized with XRD, FESEM, TEM, BET, and UV-vis DRS. TEM observations reveal that P25 is closely deposited on the Zn 0.15 Cd 0.85 S nanoflowers with maintaining its nanoflower morphology. The photocatalytic activity of the as-obtained photocatalyst shows that the P25/Zn 0.15 Cd 0.85 S exhibits very high catalytic activity for degradation of Rh-B under visible light irradiation due to an increasing of the active sites and enhancing the catalyst stability because of the minimum recombination of the photo-induced electrons and holes. Moreover, it is found that the nanocomposite retains its photocatalytic activity even after four cycles. In addition, to explain the mechanism of degradation, scavengers are used to confirm the reactive species. Photo-generated holes and • OH play a significant role in the visible light of P25/Zn 0.15 Cd 0.85 S nanocomposite induced degradation system, but electrons play the most important role.

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Effect of PSS on morphology and optical properties of ZnO

Cited by 100 publications

References 30 publications

Preparation, Characterization, and Antimicrobial Activities of ZnO Nanoparticles/Cellulose Nanocrystal Nanocomposites

Preparation, Characterization, and Antimicrobial Activities of ZnO Nanoparticles/Cellulose Nanocrystal Nanocomposites

Calcined Solution-Based PVP Influence on ZnO Semiconductor Nanoparticle Properties

Surface Decorated Zn0.15Cd0.85S Nanoflowers with P25 for Enhanced Visible Light Driven Photocatalytic Degradation of Rh-B and Stability

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