Structural, optical, photo catalytic and antibacterial activity of ZnO and Co doped ZnO nanoparticles

Nair, Manjula G.; Nirmala, M. Joyce; Rekha, K.; Anukaliani, A.

doi:10.1016/j.matlet.2011.03.079

Cited by 349 publications

(125 citation statements)

References 14 publications

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“…Recently, it has been reported that, Cobalt doped ZnO nanoparticles photoluminescence intensity owing to the vacancies varies with the Co concentration because of the increment of oxygen vacancies [29]. Nair et al (2011) report suggest that ZnO:Co 2? nanoparticles can be used as immobilized photo catalysts for water and environmental detoxification from organic compounds, inorganic compounds like arsenic and bacteria [30].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, structural and optical properties of pure ZnO and Co doped ZnO nanoparticles prepared by the co-precipitation method

Devi¹,

Velu²

2016

J Theor Appl Phys

125

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Pure ZnO and Cobalt (Co) doped ZnO nanoparticles (NPs) were synthesized by the co-precipitation method. The synthesized nanoparticles retained the wurtzite hexagonal structure, which was confirmed by X-ray diffraction studies. From FESEM studies, ZnO and Co doped ZnO NPs showed Spherical and nanorod mixed phase and Spherical like morphology, respectively. The amount of dopant (Co 2? ) incorporated into ZnO sample was determined by EDAX. The FT-IR spectra confirmed the Zn-O stretching bands at 438 and 427 cm -1 for ZnO and Co doped ZnO NPs. From the UV-VIS spectroscopic measurements, the excitonic pecks were found around 376 and 370 nm for the respective samples. The photoluminescence measurements revealed that the broad emission was composed of seven different bands due to zinc vacancies, oxygen vacancies and surface defects. The dynamic light scattering (DLS) and Zeta potential measurements were used to find out the size and surface charges.

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Section: Introductionmentioning

confidence: 99%

“…Nair et al (2011) report suggest that ZnO:Co 2? nanoparticles can be used as immobilized photo catalysts for water and environmental detoxification from organic compounds, inorganic compounds like arsenic and bacteria [30].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structural and optical properties of pure ZnO and Co doped ZnO nanoparticles prepared by the co-precipitation method

Devi¹,

Velu²

2016

J Theor Appl Phys

125

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“…The novel properties of nanoscale zinc oxide particles have found applications in a variety of applications such as luminescence [1][2][3], varistors [4,5], solar cells [6], gas sensors [7,8]. Many of the synthetic approaches such as sol-gel method [13], co-precipitation [12], hydrothermal method [14], microwave synthesis [9][10][11], and thermal evaporation method [15] have been used for the preparation of ZnO powders. Amongst the different methods of synthesis of ZnO nanostructures, the sol-gel method is attractive for its simplicity and environmentfriendly conditions.…”

Section: Introductionmentioning

confidence: 99%

“…The novelty of this method is that the samples were not purified and centrifuged in the fabrication stage because of oxidation. In many synthesis methods, the researchers purified samples to have uniform particles which oxidize ZnO nanoparticles by purification and centrifugation process [2,8,[10][11][12][13][14][15]. Synthesis of ZnO nanoparticles by sol-gel technique is reported by Zn(NO 3 ) 2 Á6H 2 O precursor and calcined at 500°C.…”

Section: Introductionmentioning

confidence: 99%

Multiple-layered structure of obelisk-shaped crystalline nano-ZnO prepared by sol–gel route

2015

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Zinc oxide nanopowders were synthesized by the simple sol-gel method from an ethanol solution of zinc nitrate hexahydrate. Structural and surface morphological investigations were carried out using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR) and ultraviolet-visible (UV-Vis) spectrophotometry analyses. XRD pattern showed that the zinc oxide nanoparticles exhibited hexagonal wurtzite structure. A multiple-layered structure of obelisk-shaped ZnO nanoparticles was achieved after calcinations. The average particle size of ZnO was around 20 nm as estimated by direct HRTEM observation. The size of sphere-like shaped ZnO nanoparticles was measured in the range of 20-80 nm and the size of pyramid-like shaped annealed samples was achieved in the range of 40-100 nm with less agglomeration. The energy dispersive spectroscopy spectrum showed peaks of zinc and oxygen. The sharp peaks in FTIR spectrum determined the Zn-O stretching and absorbance peak of UV-Vis spectrum showed the wide bandgap energy of 3.35 eV.

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“…9 Current advancements in nanomaterials have guaranteed [10][11][12] Nowadays, metal-fabricated nanomaterials have been gaining extensive interest because of their enriched optical, catalytic and antibacterial properties. 13,14 Hence, it is made easier to recover and reuse the catalysts by incorporation of magnetic nanoparticles in catalysts or absorbents simply by applying the external magnetic field. 15 That is why, different metal nanoparticles, particularly the gold, cobalt, nickel and silver, have been synthesized.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structural characterization and catalytic application of citrate-stabilized monometallic and bimetallic palladium@copper nanoparticles in microbial anti-activities

Ullah

Khan²,

Sohail³

et al. 2017

IJN

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In this research work, copper (Cu), palladium (Pd) and their bimetallic palladium@ copper (Pd@Cu) nanoparticles were synthesized using trisodium citrate as a stabilizing agent using the known chemical reduction method. The synthesized Cu, Pd and Pd@Cu nanoparticles were characterized by the ultraviolet–visible spectroscopy, scanning electron microscopy and X-ray diffraction spectroscopy, respectively. The different volumes of trisodium citrate were used for the stability of synthesized monometallic Cu, Pd and bimetallic Pd@Cu nanoparticles. The synthesized Cu, Pd and their bimetallic Pd@Cu nanoparticles were used as catalysts for the reduction of 4-nitrophenol in the presence of NaBH 4 . The bimetallic Pd@Cu nanoparticles had efficient catalytic activities with a high rate constant (1.812 min −1 ) as compared to monometallic Cu (0.3322 min −1 ) and Pd (0.2689 min −1 ) nanoparticles, respectively. The correlation coefficient ( R 2 ) was found to be 0.99 for these three nanoparticles. Meanwhile, the effect of Cu, Pd and bimetallic Pd@Cu nanoparticles was checked on the physiology of specific different micro-organism strains. The bimetallic Pd@Cu nanoparticles reported the maximum resistance at maximum level the growth of bacterial strain and had observed a smooth antibacterial graph than the monometallic analogs.

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Structural, optical, photo catalytic and antibacterial activity of ZnO and Co doped ZnO nanoparticles

Cited by 349 publications

References 14 publications

Synthesis, structural and optical properties of pure ZnO and Co doped ZnO nanoparticles prepared by the co-precipitation method

Synthesis, structural and optical properties of pure ZnO and Co doped ZnO nanoparticles prepared by the co-precipitation method

Multiple-layered structure of obelisk-shaped crystalline nano-ZnO prepared by sol–gel route

Synthesis, structural characterization and catalytic application of citrate-stabilized monometallic and bimetallic palladium@copper nanoparticles in microbial anti-activities

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