Enhanced antibacterial performance of hybrid semiconductor nanomaterials: ZnO/SnO2 nanocomposite thin films

Talebian, Nasrin; Nilforoushan, Mohammad Reza; Zargar, Elahe Badri

doi:10.1016/j.apsusc.2011.08.070

Cited by 85 publications

(31 citation statements)

References 74 publications

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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%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2015

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“…The decrease of the size of TiO 2 and ZnO particles into the nanometer range increases the energy gap but this modification is not sufficiently large to make the production of pair electron-hole under the effect of the daily light negligible. Detailed investigations on the antibacterial features of ZnO/SnO 2 composite films revealed that the antibacterial activity (for Escherichia coli) is enhanced by UV irradiation but it is not completely stopped in dark [18]. The fact that some films retained even in the dark some antibacterial activity may indicate the presence of trapped oxygen species (assuming that a perfect dark was achieved) and may provide a path to intrinsic, passive antibacterial features (not mediated by light).…”

Section: Potential Biological and Medical Applicationsmentioning

confidence: 99%

Nanoparticles and Bacteria

Chipara¹,

Ibrahim²,

Yust³

et al. 2015

JNMR

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A concise critical review of the antibacterial features of some nanoparticles (metallic and oxide semiconductors) is presented. The review starts with a brief analysis of the physical features of nanoparticles and includes a discussion about the system nanoparticles-water-light, which is of utmost importance in biological and medical cases. Both metal and semiconducting nanoparticles are releasing electrons under the effect of the incoming electromagnetic radiation (light). This is the source of major misunderstandings as the antibacterial features of nanoparticles can be intrinsic (in this case antibacterial capabilities will be measured in the absence of light) or mediated (in this case the antibacterial features will be observed solely under light irradiation). The critical review opens the discussion about the need for experimental measurements in dark and under the effect of light-a type of research that was typically disregarded. The main ideas are supported by examples from specialty research. New concepts as specificity and effectiveness of antibacterial features are tentatively suggested.

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“…10 ZnO nanoparticles have exhibited antibacterial activity against broad range of bacteria, including Staphylococcus aureus 11,12 and Escherichia coli, to name two. [13][14][15] Very little attention has been paid to the antibacterial activity of ZnO nanowires; however, there exist a few reports on the photocatalytic activity. For example, Wu et al reported the synthesis of Na-doped ZnO nanowires with improved photocatalytic properties due to increase in surface defects and enhancement in visible emission.…”

Section: Introductionmentioning

confidence: 99%

Significance of postgrowth processing of ZnO nanostructures on antibacterial activity against gram-positive and gram-negative bacteria

Mehmood¹,

Ismail²,

Mirza³

et al. 2015

IJN

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In this work, we highlighted the effect of surface modifications of one-dimensional (1D) ZnO nanostructures (NSs) grown by the vapor–solid mechanism on their antibacterial activity. Two sets of ZnO NSs were modified separately – one set was modified by annealing in an Ar environment, and the second set was modified in O 2 plasma. Annealing in Ar below 800°C resulted in a compressed lattice, which was due to removal of Zn interstitials and increased O vacancies. Annealing above 1,000°C caused the formation of a new prominent phase, Zn 2 SiO 4 . Plasma oxidation of the ZnO NSs caused an expansion in the lattice due to the removal of O vacancies and incorporation of excess O. Photoluminescence (PL) spectroscopy was employed for the quantification of defects associated with Zn and O in the as-grown and processed ZnO NS. Two distinct bands were observed, one in the ultraviolet (UV) region, due to interband transitions, and other in the visible region, due to defects associated with Zn and O. PL confirmed the surface modification of ZnO NS, as substantial decrease in intensities of visible band was observed. Antibacterial activity of the modified ZnO NSs demonstrated that the surface modifications by Ar annealing limited the antibacterial characteristics of ZnO NS against Staphylococcus aureus . However, ZnO NSs annealed at 1,000°C or higher showed a remarkable antibacterial activity against Escherichia coli . O 2 plasma–treated NS showed appreciable antibacterial activity against both E. coli and S. aureus . The minimum inhibition concentration was determined to be 0.5 mg/mL and 1 mg/mL for Ar-annealed and plasma-oxidized ZnO NS, respectively. It was thus proved that the O content at the surface of the ZnO NS was crucial to tune the antibacterial activity against both selected gram-negative ( E. coli ) and gram-positive ( S. aureus ) bacterial species.

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Enhanced antibacterial performance of hybrid semiconductor nanomaterials: ZnO/SnO2 nanocomposite thin films

Cited by 85 publications

References 74 publications

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

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

Nanoparticles and Bacteria

Significance of postgrowth processing of ZnO nanostructures on antibacterial activity against gram-positive and gram-negative bacteria

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