Synthesis, Characterization, and Spectroscopic Properties of ZnO Nanoparticles

Talam, Satyanarayana; Karumuri, Srinivasa Rao; Gavvalapalli, Nagarjuna

doi:10.5402/2012/372505

Cited by 490 publications

(279 citation statements)

References 35 publications

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“…However, in another study, they did not observe any color change after 72 hrs also indicating there was no synthesis of silver nanoparticles [27]. We have got very similar AFM results for the characterization of the silver and ZnO nanoparticles observed in some previous studies, respectively [30,32]. We have got similar functional groups through FTIR analysis in some previous studies for the confirmation of AGNPs and ZnONPs, respectively [25,33].…”

Section: Discussionsupporting

confidence: 67%

Green Synthesis and Characterization of Marine Yeast-Mediated Silver and Zinc Oxide Nanoparticles and Assessment of Their Antioxidant Activity

Aswathy

Gabylis

et al. 2017

Asian J Pharm Clin Res

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Objective: The present study focuses on the synthesis of silver and zinc oxide (ZnO) nanoparticles from marine yeasts, isolated from the sediments of the Bay of Bengal, Bakkhali coast, West Bengal, and India. Methods:The marine sediment samples were diluted through serial diution and cultured onto yeast malt agar medium by the spread plate method. The selected yeast isolates were screened for the biosynthesis of silver and ZnO nanoparticles. Characterization of both the nanoparticles was done by applying ultraviolet (UV)-visible spectroscopy, atomic force microscopy, scanning electron microscopy, and Fourier transform infrared spectroscopy.Results: A total of five marine yeasts isolates were able to synthesize silver and ZnO nanoparticles as evidence of the color change. Optical density was measured in UV-spectrometer at different time interval for the conformation of production of nanoparticles. The size of silver nanoparticle was 31.78 nm and ZnO nanoparticle was 86.27 nm. The synthesized nanoparticles are then used for antioxidant assays. Conclusions:We are concluding that marine yeast isolates SAG1 and SAG2 both are potential marine yeast isolates which can synthesize both the silver and ZnO nanoparticles. They also showed good antioxidant activity.

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Section: Discussionsupporting

confidence: 67%

Green Synthesis and Characterization of Marine Yeast-Mediated Silver and Zinc Oxide Nanoparticles and Assessment of Their Antioxidant Activity

Aswathy

Gabylis

et al. 2017

Asian J Pharm Clin Res

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“…Though reports are available on the chemical synthesis of Zinc oxide nanoparticles [15][16][17] but green synthesis of zinc nanoparticles using plant extracts is an area which has not been explored much yet. Due to the large surface area and high catalytic activity of zinc oxide nanoparticles they are used in many catalytic processes [17].…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Zinc Oxide Nanoparticles Using Parthenium hysterophorus Leaf Extract and Evaluation of their Antibacterial Properties

Datta¹,

Patra²,

Bharadwaj³

et al. 2017

J Biotechnol Biomater

100

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Parthenium hysterophorus an annual herbaceous weed, is known for its vigorous growth and as a causative agent for contact dermatitis, hay fever and diarrhea in humans and systemic toxicity in livestock. However, in spite of all the problems associated with this weed, it has been reported to have pharmacological activities. The objective of this study is to evaluate the potential of Parthenium hysterophorus leaf extracts for the synthesis of zinc oxide nanoparticles and their antimicrobial properties. Nanoparticles were extracted with the help of aqueous, methanolic and ethanolic solutions of P. hysterophorus leaves. Since a higher yield of nanoparticles was observed when synthesised using aqueous extract therefore these were used in further experiments. Synthesised nanoparticles were characterised using UV-Vis spectroscopy with maximum absorbance peak at 400 nm. SEM and TEM analysis revealed that the particles were spherical and cylindrical in shape with average particle size ranging from 16-45 nm. The chemical group association and elemental composition of nanoparticles was analysed using FTIR and SEM-EDX. Green synthesized zinc oxide nanoparticles were evaluated for antimicrobial activities against Gram positive and Gram negative bacteria. Zinc nanoparticles exhibited maximum zone of inhibition against Enterobacter aerogenes (36 mm) while least activity was seen against Staphylococcus aureus and Bacillus subtilis.

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“…ZnO nanoparçacıklarının boyutu düştükçe UV spektrumundaki maviye kayma davranışı sıklıkla gözlenmektedir ve genellikle quantum sınırlandırma etkisiyle açıklanmaktadır [26][27]37]. ZnO'in Bohr çapı yaklaşık 6.48 nm olduğu için ancak parçacık boyutu 7-8 nm'den düşük olduğu durumlarda quantum sınırlandırma etkisi kaynaklı bant aralığı genişlemesi olabileceği belirtilmiştir [27,38] …”

Section: Tartışma Ve Sonuçunclassified

L-Sistein Derişimine Bağlı ?-Zn(OH)2 Oluşumu ve Kalsinasyon Ürünleri Olarak Farklı Morfolojideki ZnO Yapıları

Top¹

2018

deufmd

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Structural characterization of the precipitation products of zinc nitrate and sodium hydroxide obtained using L-cysteine additive was carried out. XRD analysis showed that -Zn(OH)2 crystal structure formed in the synthesis condition where L-cysteine:zinc molar ratio was 0.165:1. Plate-like morphology, was oberved in the SEM micrograph of this sample. No crystal structure was apparent upon increasing L-cysteine:zinc ratio ten fold. L-cysteine contents of the samples synthesized at low and high L-cysteine:zinc ratios were calculated as 6.0 % and 38.4 %, respectively. Calcination of both samples at 700 o C for 2 hours yielded formation of ZnO. In the UV-Vis spectra of the ZnO samples two peaks were observed at 329 nm and 381 nm. Crystal defects of these samples were determined via PL spectroscopy.

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Synthesis, Characterization, and Spectroscopic Properties of ZnO Nanoparticles

Cited by 490 publications

References 35 publications

Green Synthesis and Characterization of Marine Yeast-Mediated Silver and Zinc Oxide Nanoparticles and Assessment of Their Antioxidant Activity

Green Synthesis and Characterization of Marine Yeast-Mediated Silver and Zinc Oxide Nanoparticles and Assessment of Their Antioxidant Activity

Green Synthesis of Zinc Oxide Nanoparticles Using Parthenium hysterophorus Leaf Extract and Evaluation of their Antibacterial Properties

L-Sistein Derişimine Bağlı ?-Zn(OH)2 Oluşumu ve Kalsinasyon Ürünleri Olarak Farklı Morfolojideki ZnO Yapıları

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