Porous zinc oxide nanocrystalline film deposition by atmospheric pressure plasma: Fabrication and energy band estimation

Jain, Gunisha; Macías-Montero, Manuel; Velusamy, Tamilselvan; Maguire, Paul; Mariotti, Davide

doi:10.1002/ppap.201700052

Cited by 22 publications

(16 citation statements)

References 63 publications

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“…Small scale synthesis of ZnO NP with unique physicochemical properties has been reported using a range of different techniques such as microwave heating technology, 8 atmospheric pressure plasma 9 and wet chemistry-based methods in bulk liquid like hydrothermal growth method. 10 Nanoparticles synthesized by wet chemical techniques can produce a wide variety of novel morphologies due to the higher influence on chemical reactions in the synthesis procedure and these morphologically complex structures can enhance photocatalytic and antimicrobial properties.…”

Section: Introductionmentioning

confidence: 99%

Growth Inhibition of Gram-Positive and Gram-Negative Bacteria by Zinc Oxide Hedgehog Particles

Rutherford¹,

Jíra²,

Kolářová³

et al. 2021

IJN

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Purpose: Nanomaterials for antimicrobial applications have gained interest in recent years due to the increasing bacteria resistance to conventional antibiotics. Wound sterilization, water treatment and surface decontamination all avail from multifunctional materials that also possess excellent antibacterial properties, eg zinc oxide (ZnO). Here, we assess and compare the effects of synthesized hedgehog-like ZnO structures and commercial ZnO particles with and without mixing on the inactivation of bacteria on surfaces and in liquid environments. Methods: Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria in microbial culture medium were added to reverse spin bioreactors that contained different concentrations of each ZnO type to enable dynamic mixing of the bacteria-ZnO suspensions. Optical density of the bacteria-ZnO suspensions was measured in real-time and the number of viable bacteria after 24 h exposure was determined using standard microbiological techniques. The concentration of zinc ion generated from ZnO dissolution in different liquid types was estimated from the dynamic interaction exposure. Static antibacterial tests without agitation in liquid media and on agar surface were performed for comparison. Results: A correlation between increasing ZnO particle concentration and reduction in viable bacteria was not monotonous. The lowest concentration tested (10 µg/mL) even stimulated bacteria growth. The hedgehog ZnO was significantly more antibacterial than commercial ZnO particles at higher concentrations (up to 1000 µg/mL tested), more against E. coli than S. aureus. Minimum inhibitory concentration in microwell plates was correlated with those results. No inhibition was detected for any ZnO type deposited on agar surface. Zinc ion release was greatly suppressed in cultivation media. Scanning electron microscopy images revealed that ZnO needles can pierce membrane of bacteria whereas the commercial ZnO nanoparticles rather agglomerate on the cell surface. Conclusion:The inhibition effects are thus mainly controlled by the interaction dynamics between bacteria and ZnO, where mixing greatly enhances antibacterial efficacy of all ZnO particles. The efficacy is modulated also by ZnO particle shapes, where hedgehog ZnO has superior effect, in particular at lower concentrations. However, at too low concentrations, ZnO can stimulate bacteria growth and must be thus used with caution.

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Section: Introductionmentioning

confidence: 99%

Growth Inhibition of Gram-Positive and Gram-Negative Bacteria by Zinc Oxide Hedgehog Particles

Rutherford¹,

Jíra²,

Kolářová³

et al. 2021

IJN

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“…As evident in Figure 7a, the high-resolution XPS spectrum of Zn2p3/2 is fitted by two peaks located at a binding energy of 1021.21 and 1022.18 eV, and can be attributed to the ZnO and Zn(OH)2, respectively [23,27,29]. It can be clearly seen in Figure 7b that the highresolution XPS spectrum of O1s is fitted by four peaks located at 530.75, 531.72 532.78, and 533.79 eV, corresponding to the Zn-O bonding of the ZnO structure, Zn(OH)2, C-O or C=O, and C-O-C, respectively [23,26,29].…”

Section: Characterization Of Coatings On Wood By Xpsmentioning

confidence: 94%

“…The high-resolution XPS spectrum of C1s is shown in Figure 7c. The C1s peak is fitted by three peaks located at the binding energy of 284.55, 285.66, and 288.52 eV, corresponding to C-C, C-O, and C=O, respectively [23,27,29]. The high-resolution spectrum of N1s is shown in Figure 7d.…”

Section: Characterization Of Coatings On Wood By Xpsmentioning

confidence: 99%

“…The FTIR spectra are given in Figure 5. The IR spectrum of pure ZnO particles (Figure 5a) showed two characteristic peaks: a broad and very weak peak at 3431 cm −1 corresponding to the O-H stretching vibration of hydroxyl groups, and the strong absorption peak at 445 cm −1 corresponding to the Zn-O stretching vibration [26,27]. The FTIR spectrum of zinc nitrate hexahydrate Zn(NO 3 ) 2 •6H 2 O is shown in Figure 5b.…”

Section: Characterization Of Coatings By Ftirmentioning

confidence: 99%

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Deposition of Zinc Oxide Coatings on Wood Surfaces Using the Solution Precursor Plasma Spraying Process

2021

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In the present work, the solution precursor plasma spray (SPPS) process was used to deposit zinc oxide (ZnO) coatings on wood surfaces using zinc nitrate solution as precursor to improve the hydrophobicity and the color stability of European beech wood under exposure to ultraviolet (UV) light. The surface morphology and topography of the wood samples and the coatings were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The formation of ZnO was detected with the help of X-ray photoelectron spectroscopy (XPS) and by Fourier transform infrared (FTIR) spectroscopy. The FTIR spectra of the coated samples showed the typical Zn–O band at 445 cm−1. According to the XPS analysis, the coatings consist of two different Zn-containing species: ZnO and Zn(OH)2. Variation of the deposition parameters showed that the most significant parameters affecting the microstructure of the coating were the solution concentration, the deposition scan speed, and carrier gas flow rate. The wettability behaviors of the coated wood were evaluated by measuring the water contact angle (WCA). The coatings that completely covered the wood substrates showed hydrophobic behaviors. UV-protection of wood surfaces after an artificial UV light irradiation was evaluated by color measurements and FTIR spectroscopy. The ZnO-coated wood surfaces were more resistant to color change during UV radiation exposure. The total color change decreased up to 60%. Additionally, the FTIR spectra showed that the wood surfaces coated with ZnO had more stability. The carbonyl groups formation and C=C-bonds consumption were significantly lower.

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“…23 Microplasma-based processes can be considered a generalized approach for the synthesis of a wide range of metal and metal oxides nanoparticles. [24][25][26][27][28][29] However, in the specific case of metallic Cu-NPs, a detailed analysis of mean size, size distribution and of the chemical composition (e.g. degree of oxidation) of NPs produced by microplasmas is still missing.…”

Section: Introductionmentioning

confidence: 99%

Surfactant-free synthesis of copper nanoparticles and gas phase integration in CNT-composite materials

et al. 2021

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Porous zinc oxide nanocrystalline film deposition by atmospheric pressure plasma: Fabrication and energy band estimation

Cited by 22 publications

References 63 publications

Growth Inhibition of Gram-Positive and Gram-Negative Bacteria by Zinc Oxide Hedgehog Particles

Growth Inhibition of Gram-Positive and Gram-Negative Bacteria by Zinc Oxide Hedgehog Particles

Deposition of Zinc Oxide Coatings on Wood Surfaces Using the Solution Precursor Plasma Spraying Process

Surfactant-free synthesis of copper nanoparticles and gas phase integration in CNT-composite materials

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