Influence of pH on structural, morphological and optical properties of chemically deposited nanocrystalline ZnO thin films

Amalraj, A.; Dharani, A. P.; Inbaraj, P. Fermi Hilbert; Sivakumar, V.; Senguttuvan, G.

doi:10.1007/s10854-015-3568-0

Cited by 8 publications

(6 citation statements)

References 28 publications

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“… 46 This structure is part of the space group C 4 6 v in the Schoenflies notation and P 6 3 mc in the Hermann–Mauguin system and exhibits a noncentrosymmetric structure (a condition at where the space groups lack inversion center). 46 At ambient conditions, only the wurtzite structure has a thermodynamically stable hexagonal unit cell, 44 wherein four oxygen atoms surround each tetrahedral Zn atom and vice versa ( 47 )…”

Section: Resultsmentioning

confidence: 99%

“…ZnO is known to occur in three crystal (lattice) structures viz. rock-salt (B 1 ), cubic zinc-blende (B 3 ), and wurtzite (B 4 ). , The zinc-blende shape is stabilized by hetero-epitaxial expansion on cubic substrates, for example GaAs/ZnS, ZnS, and Pt/Ti/SiO 2 /Si, while the structure of the Rochelle salt/rock salt (NaCl) is a metastable state reached at high pressure only. Wurtzite ZnO is a hexagonal crystal having lattice parameters “ a ” and “ c ” and a lattice constant ( c / a ) of (1:633, in a typical wurtzite hexagonal structure), with [0 0 0 1] or basal plane as the surface most frequently used for growth .…”

Section: Resultsmentioning

confidence: 99%

“…46 This structure is part of the space group C 4 6v in the Schoenflies notation and P6 3 mc in the Hermann−Mauguin system and exhibits a noncentrosymmetric structure (a condition at where the space groups lack inversion center). 46 At ambient conditions, only the wurtzite structure has a thermodynamically stable hexagonal unit cell, 44 wherein four oxygen atoms surround each tetrahedral Zn atom and vice versa 47 The Fourier transform infrared (FTIR) spectroscopy analysis of ZNs was performed in the range of 400−4000 cm −1 at room temperature (Figure 2C). In general, metal oxides display absorption bands below 1000 cm −1 in the fingerprint region, which is generated by inter-atomic vibrations.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Anti-quorum Sensing and Anti-biofilm Activity of Zinc Oxide Nanospikes

et al. 2020

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This study evaluates the impact of two separate incubation periods (4 and 6 weeks) on the morphology of sol–gel-fabricated ZnO nanospikes (ZNs), that is, ZN1 and ZN2, respectively. We further analyzed the inhibitory effects of ZN1 and ZN2 on quorum sensing (QS) and biofilm formation in Pseudomonas aeruginosa (PAO1) and Chromobacterium violaceum (strains 12472 and CVO26). The size of the synthesized ZNs was in the range of 40–130 nm, and finer nanoparticles were synthesized after an incubation period of 6 weeks. Treatment with ZNs decreased the production of violacein in the pathogen without affecting the bacterial growth, which indicated that ZNs inhibited the QS signaling regulated by N -acyl homoserine lactone. ZN2 had a higher inhibitory action on the virulence factor productivity than ZN1. Furthermore, ZN2-treated cells displayed a substantial decrease in azocasein-degrading protease activity (80%), elastase activity (83%), and pyocyanin production (85%) relative to untreated P. aeruginosa PAO1 cells. Treatment with ZN2 decreased swarming motility and exopolysaccharide production by 89 and 85%, respectively. ZN2 was effective against both the las & pqs systems of P. aeruginosa and exhibited broad-spectrum activity. Additionally, ZN2 was more efficient in inhibiting the biofilm formation at the attachment stage than ZN1. These findings revealed that in P. aeruginosa , ZN2 demonstrated inhibitory effects on QS as well as on the development of biofilms. Thus, ZN2 can be potentially used to treat drug-resistant P. aeruginosa infections.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

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Anti-quorum Sensing and Anti-biofilm Activity of Zinc Oxide Nanospikes

et al. 2020

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“…080-0075, Te International Centre for Difraction Data, PA, USA). Tree crystal lattice confgurations of ZnO are known to exist: wurtzite (B4), cubic zincblende (B3), and rock salt (B1) [39,40]. Only heteroepitaxial formation on cubic platforms, such as ZnS, GaAs/ZnS, and Pt/Ti/SiO2/Si, can maintain the zinc-blende type, whereas elevated pressure is required to produce the metastable rock salt or Rochelle salt (NaCl) form.…”

Section: Structural Properties Of Synthesized G-zno Npsmentioning

confidence: 99%

Grass-Shaped Zinc Oxide Nanoparticles Synthesized by the Sol-Gel Process and Their Antagonistic Properties towards the Biotrophic Parasite, Meloidogyne incognita

Khan

Jameel

et al. 2023

Bioinorganic Chemistry and Applications

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The presence of Meloidogyne spp., also known as root-knot nematodes, presents a significant danger to global agricultural progress. Since chemical nematicides have high levels of toxicity, it is imperative to develop environmentally friendly methods to manage root-knot nematodes. Nanotechnology is now the most progressive way to attract researchers due to its innovative quality in combating plant diseases. Our study focused on the sol-gel process to synthesize grass-shaped zinc oxide nanoparticles (G-ZnO NPs) and assess its nematicidal behavior against Meloidogyne incognita. Various concentrations (250, 500, 750, and 1000 ppm) of G-ZnO NPs were utilized to expose both the infectious stage (J2s) and egg masses of M. incognita. Laboratory results revealed that G-ZnO NPs showed toxicity to J2s with LC50 values of 1352.96, 969.64, and 621.53 ppm at 12, 24, and 36 hours, respectively, and the result was the inhibition of egg hatching in M. incognita. All three exposure periods were reported linked with the concentration strength of G-ZnO NPs. The pot experiment results exhibited that G-ZnO NPs significantly reduced the root-gall infection of chickpea plants under M. incognita attack. Compared with the untreated control, there was a significant improvement in plant growth attributes and physiological parameters as well, when distinct G-ZnO NP doses (250, 500, 750, and 1000 ppm) were applied. In the pot study, we noticed a reduction in the root-gall index with an increase in the concentration of G-ZnO NPs. The results confirmed that G-ZnO NPs have enormous potential in sustainable agriculture for controlling the root-knot nematode, M. incognita, in chickpea production.

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“…As the pH increases from 7.5 to 10.5, through 8.5 and 9.5 the value transmittance percentage increases. [15][16][17][18] …”

Section: Fig 3:-absorption Spectra Of Zno Nanorods At Different Ph Vmentioning

confidence: 99%

PHOTOCATYLITIC DEGRADATION OF METHELENE BLUE DYE USING ZnO NANORODS AND SUN LIGHT.

Vasudevan¹,

Venkatachalam²,

Saroja³

et al. 2017

IJAR

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The ZnO nanorods have been successfully synthesized by seed layer preparation using dip coating method and by growth layer preparation using hydrothermal method. The prepared ZnO nanorods were characterized using X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and UV-Visible spectrophotometer (UV-Abs).. These ZnO nanostructures were explored as catalyst for solar-light induced photo catalytic degradation of methylene blue dye in an aqueous solution. The degradation rates depend on the dye structure, concentration, solvent-dependent ZnO film morphologies, pH of the medium and excitation light source. The photocatalytic performances of the obtained ZnO nanorods were deeply investigated for possible application of textile/water treatment. …………………………………………………………………………………………………….... Introduction:-The ZnO have been widely used metal oxide semiconductor material for photo catalysts processes. The ZnO have a band gap of about 3.38 eV and high exciton binding energy of 60 meV.[1] The synthesis of ZnO nano particles with different morphologies and sizes were made by researches. One-dimensional nanostructures (e.g., nano wires, nanorods, nano needles, nano tubes, columns and helices) play an important role in many applications because they possess high surface to volume ratio with short diffusion length area.[2-5].The one-dimensional nanostructures have large junction area which imparts low reflectance provide a direct pathway for charge transport [6].Also, these materials reduce the recombination of excitons and thus show high energy conversion efficiency and since ZnO has a wide band gap, its use is restricted to the visible region.The photo catalytic activity of the investigated materials was tested by the degradation experiments, the samples were irradiated by solar light for 120 minutes in order to remove the hydrocarbons from the sample surface.. The glass substrates were dipped in methelene blue aqueous solutions where samples are immersed was irradiated by a solar light. The irradiated solution was measured at regular time intervals with an UV Vis spectrophotometer JASCO-570 UV-Vis spectrophotometer. Degradation of methelene blue was evaluated by the absorption peak at 655nm. The photo degradation reaction was calculated from the linear plot of ln [Co/C] versus from the irradiation time. The decomposition of the methelene blue in the absence of any photo catalyst materials was checked as a reference. [7][8]

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Influence of pH on structural, morphological and optical properties of chemically deposited nanocrystalline ZnO thin films

Cited by 8 publications

References 28 publications

Anti-quorum Sensing and Anti-biofilm Activity of Zinc Oxide Nanospikes

Anti-quorum Sensing and Anti-biofilm Activity of Zinc Oxide Nanospikes

Grass-Shaped Zinc Oxide Nanoparticles Synthesized by the Sol-Gel Process and Their Antagonistic Properties towards the Biotrophic Parasite, Meloidogyne incognita

PHOTOCATYLITIC DEGRADATION OF METHELENE BLUE DYE USING ZnO NANORODS AND SUN LIGHT.

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