Effect of NaOH concentration on optical properties of zinc oxide nanoparticles

Koutu, Vaibhav; Shastri, Lokesh A.; Malik, М. M.

doi:10.1515/msp-2016-0119

Cited by 102 publications

(55 citation statements)

References 34 publications

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“…But at higher supersaturation, crystal nucleation dominates crystal growth, resulting in smaller crystallite size. These obtained results are in fair agreement with the observation ( Figure 9) that by decreasing concentration increases the level of supersaturation, thus crystallite size is reduced [14]. Figure 10 shows that UV-Vis absorption spectrum of ZnO nanopowders using 2.5 M, 5 M and 7.5 M concentration of NaOH synthesized from analytical grade ZnCl 2 and using 2.5 M concentration of NaOH synthesized from battery waste.…”

Section: Particle Size Distributionsupporting

confidence: 88%

“…Profound studies have been done on various factors, such as precursor concentrations, temperature, duration, dopant concentration and solvent medium, pH of the reaction mixture which individually and collectively affects the shape, size and optical properties of ZnO nanoparticles. Various researchers revealed that NaOH concentration plays a vital role in determining the morphology, size, shape and optical band gap of obtained nanostructures [14].…”

Section: Introductionmentioning

confidence: 99%

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ZnO nanoparticles preparation from spent zinc–carbon dry cell batteries: studies on structural, morphological and optical properties

Nath

Ahmed

Gafur

et al. 2018

Journal of Asian Ceramic Societies

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Recovery and recycling of valuable materials from battery waste is challenging as well as important from economic and environmental point of view. In this work, spent zinc-carbon batteries were processed with HCl and NaOH to synthesize ZnO nanoparticles. ZnO nanopowders were also prepared by using ZnCl 2 as precursors with varying amount of NaOH using sol-gel method. In both cases, ZnO nano particles were characterized with XRD, XRF, FESEM, EDAX, particle size analyzer and UV-visible (UV-Vis) spectroscopy. The purity of the synthesized ZnO from spent zinc-carbon batteries was found to be 99.69%. FESEM micrographs showed the reduction in particle size from 50 nm to 20 nm with a decrease in NaOH concentration. UV-Vis study showed significant peak shift with maximum absorption between 365 nm and 359 nm region of the visible spectrum. Because of these remarkable properties, as prepared ZnO nanoparticles can find applications in biomedicine, nanoelectronic devices, sensors, nanomedicine, GATE dielectrics, photovoltaic devices, etc.

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Section: Particle Size Distributionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

ZnO nanoparticles preparation from spent zinc–carbon dry cell batteries: studies on structural, morphological and optical properties

Nath

Ahmed

Gafur

et al. 2018

Journal of Asian Ceramic Societies

View full text Add to dashboard Cite

show abstract

“…The used preparation procedure was described by Koutu et al [18] but applied with some modifications. Zinc acetate dehydrate (Zn(CH 3 CO 2 ) 2 .2H 2 O) and sodium hydroxide were purchased from CDH.…”

Section: Preparation Of Zinc Oxide Nanoparticles (Zno Nps)mentioning

confidence: 99%

Influence of ZnO Nanoparticles on Candida albicans of Human Male Pleural Fluid

Katafa

Hamid

2020

eijs

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The utilization of metal oxide nanoparticles, especially zinc oxide, is of a great importance in the medical field because of its physical and chemical properties as well as its antimicrobial potential effects. In our study, the ZnO nanoparticles were synthesized by the precipitation method where pH=14. ZnO nanoparticles were characterized by ultraviolet-visible spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM) and atomic force microscope (AFM). Antifungal activity of the ZnO was tested against candida albicans. The results showed that C. albicans (15 samples) became resistant to the fungal activity after testing its sensitivity to several types of fungal antibiotics. UV-vis spectroscopy, XRD, TEM and AFM showed that this precipitation synthetic method can produce a good quality of ZnO nanoparticles with sizes in the range of nanometer scale. In ZnO NPs (calcined), the inhibition zone diameter of C. albicans was 11 mm at a ZnO NPs concentration of 800 mg/ml, while no inhibition zones were formed at the other concentrations (0.25, 0.5, 1, 2, 10, 50 and 500 mg/ml). Using ZnO NPs (not calcined), the inhibition zone diameter of C. albicans was 24 mm at a concentration of 800 mg/ml, while no inhibition zones were observed at the other concentrations (0.25, 0.5, 1, 2, 10, 50 and 500 mg/ml). In addition, a toxicity test was performed on mice and proved that ZnO NPs are effective against C. albicans with a toxic effect on liver and spleen cells in rats. The aim of this research was to characterize the in vitro activity of ZnO nanoparticles synthesized by the precipitation method against C. albicans of human male pleural fluid using the well diffusion method as well as their toxic effects on both liver and spleen cells in mice.

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“…The remaining peaks were well matched by films coated on glass substrate and introduced in the aforementioned section for films deposited on FTO substrates, and the high-and low-intensity peaks are given as 931, 1100, 129, 343, 266, 797 cm −1 and 776, 1182, 558, 586, 202, 707, 482 cm −1 . The severe peaks at 931, 343, 266 cm −1 contributed to multiphoton scattering in ZnO [39], ZnWO 4 formation [40], irregularities of Raman scattering in the B 1L mode of ZnO [41], respectively. The peaks exist at 292, 1182, 1316 cm −1 specified as unknown, thereby suggesting to belong to other phases of ZnO structures.…”

Section: Resultsmentioning

confidence: 98%

Surface, optical and electrochemical performance of indium-doped ZnO/WO3 nano-composite thin films

et al. 2020

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Great demand on replacing emission and pollution-free materials for energy storage by traditional fossil fuels has led to investigating of high-performance electrochromic materials. Nano-composite for electrochromic device may be a good choice. In this paper, stack-structured indium-doped ZnO/WO 3 nano-composite thin films were deposited on glass, indium-doped tin oxide (ITO) and fluorine-doped tin oxide (FTO)-coated glass substrates, respectively. Surface, optical and electrochromic (EC) performance of the prepared nano-composite films has been investigated. Electrochromic impedance spectroscopy (EIS), cyclic voltammetry, repeating chronoamperometry (CA) and chronocoulometry (CC) measurements were taken. The Raman spectroscopy measurement shows that high-intensity peaks are related to ZnO wurtzite structure for all substrates. In the CA measurement, the rate of Li + transfer between surface and electrolyte was faster for films coated onto ITO substrate. In addition, the intercalation/deintercalation of Li + was obviously found faster for films onto ITO substrate due to roughness, structure differences than the other sample. As an advantage of our nano-composite material, the absence of current decay in the both coloration and bleaching stages has proved superiority and stability of films as well as indium contribution. The reversibility of stack-structured InZnO/WO 3 nanocomposite films was computed as 30 and 50% for the film with ITO and FTO substrates. The highest coloration efficiency value has calculated as 80 and 69 cm 2 /C for nano-composite thin films deposited onto FTO substrate @ 632 and 550 nm, respectively. Warburg impedance element values were determined from the equivalent circuit model. Also, calculated charges were determined for bleaching or coloring process for all films.

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Effect of NaOH concentration on optical properties of zinc oxide nanoparticles

Cited by 102 publications

References 34 publications

ZnO nanoparticles preparation from spent zinc–carbon dry cell batteries: studies on structural, morphological and optical properties

ZnO nanoparticles preparation from spent zinc–carbon dry cell batteries: studies on structural, morphological and optical properties

Influence of ZnO Nanoparticles on Candida albicans of Human Male Pleural Fluid

Surface, optical and electrochemical performance of indium-doped ZnO/WO3 nano-composite thin films

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