Structural, optical, and electronic properties of colloidal CuO nanoparticles formed by using a colloid-thermal synthesis process

Son, Dong Ick; You, Chan Ho; Kim, Tae Whan

doi:10.1016/j.apsusc.2009.06.056

Cited by 134 publications

(46 citation statements)

References 25 publications

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“…45 In the present investigation, a higher inhibition zone was observed for the Gram-positive S. aureus compared to other Gram-negative strains employed in this antibacterial susceptibility assay. 46 The results of the present investigation also demonstrate that the excellent antibacterial behavior depends on the sizes of the synthesized CuO.…”

Section: Antibactericidal Testssupporting

confidence: 57%

Green synthesis of copper oxide nanoparticles using gum karaya as a biotemplate and their antibacterial application

Padil¹,

Černík²

2013

IJN

220

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Background:Copper oxide (CuO) nanoparticles have attracted huge attention due to catalytic, electric, optical, photonic, textile, nanofluid, and antibacterial activity depending on the size, shape, and neighboring medium. In the present paper, we synthesized CuO nanoparticles using gum karaya, a natural nontoxic hydrocolloid, by green technology and explored its potential antibacterial application. Methods: The CuO nanoparticles were synthesized by a colloid-thermal synthesis process. The mixture contained various concentrations of CuCl 2 ⋅ 2H 2 O (1 mM, 2 mM, and 3 mM) and gum karaya (10 mg/mL) and was kept at 75°C at 250 rpm for 1 hour in an orbital shaker. The synthesized CuO was purified and dried to obtain different sizes of the CuO nanoparticles. The well diffusion method was used to study the antibacterial activity of the synthesized CuO nanoparticles. The zone of inhibition, minimum inhibitory concentration, and minimum bactericidal concentration were determined by the broth microdilution method recommended by the Clinical and Laboratory Standards Institute. Results: Scanning electron microscopy analysis showed CuO nanoparticles evenly distributed on the surface of the gum matrix. X-ray diffraction of the synthesized nanoparticles indicates the formation of single-phase CuO with a monoclinic structure. The Fourier transform infrared spectroscopy peak at 525 cm −1 should be a stretching of CuO, which matches up to the B 2u mode.The peaks at 525 cm −1 and 580 cm −1 indicated the formation of CuO nanostructure. Transmission electron microscope analyses revealed CuO nanoparticles of 4.8 ± 1.6 nm, 5.5 ± 2.5 nm, and 7.8 ± 2.3 nm sizes were synthesized with various concentrations of CuCl 2 ⋅ 2H 2 O (1 mM, 2 mM, and 3 mM). X-ray photoelectron spectroscopy profiles indicated that the O 1s and Cu 2p peak corresponding to the CuO nanoparticles were observed. The antibacterial activity of the synthesized nanoparticles was tested against Gram-negative and positive cultures. Conclusion:The formed CuO nanoparticles are small in size (4.8 ± 1.6 nm), highly stable, and have significant antibacterial action on both the Gram classes of bacteria compared to larger sizes of synthesized CuO (7.8 ± 2.3 nm) nanoparticles. The smaller size of the CuO nanoparticles (4.8 ± 1.6 nm) was found to be yielding a maximum zone of inhibition compared to the larger size of synthesized CuO nanoparticles (7.8 ± 2.3 nm). The results also indicate that increase in precursor concentration enhances an increase in particle size, as well as the morphology of synthesized CuO nanoparticles.

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Section: Antibactericidal Testssupporting

confidence: 57%

Green synthesis of copper oxide nanoparticles using gum karaya as a biotemplate and their antibacterial application

Padil¹,

Černík²

2013

IJN

220

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“…The decrease in optical transmittance with the increase in copper salt concentration can be attributed to the improvement in grain size. For the increased solution concentrations, the absorption edge shifts towards longer wavelength showing red shift in the band gap compared to the bulk CuO value (E g = 1.85 eV) [35]; it also attributes the enlargement of particle size at high concentration. The high absorbance observed in the visible region ranging from 400 to 800 nm indicates suitability of the material for the solar cell applications; it can produce higher power conversion efficiency as an absorbing material in solar cells.…”

Section: Optical Analysismentioning

confidence: 99%

Effect of bath concentration on the growth and photovoltaic response of SILAR-deposited CuO thin films

Visalakshi

Kannan

Valanarasu³

et al. 2015

Appl. Phys. A

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Solar cell property of p-CuO/n-Si heterojunction was investigated using SILAR-deposited CuO thin films. The effects of copper salt concentration on the growth of CuO films and its effect on the efficiency in solar cell conversion were investigated. Structural, morphological, optical and electrical studies of the CuO thin films deposited at 90°C with different copper sulphate concentrations are reported. Crystallinity of the film is found to increase with the increase in copper sulphate concentration. The measured Raman spectrum of the deposited film showed peaks corresponding to CuO phase. It is observed by the SEM that the film is homogeneous fully covering the substrate. The optical band gap of the deposited film has exhibited a decrease in band gap from 1.76 to 1.57 eV with the increase in copper sulphate concentration. Solar cell device was constructed using the p-CuO film deposited on n-silicon substrate, and its photovoltaic response was measured. It showed increasing photoresponse with increasing concentration of copper sulphate.

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“…It is also used in environmental remediation for the removal of organic pollutants or as a versatile biocide (Son et al, 2009;Ren et al, 2009;Cioffi et al, 2005;Zhou et al, 2006;Borkow and Gabbay, 2004;Saison et al, 2010;Zhang et al, 2014;Bondarenko et al, 2013). Notwithstanding, true global production volumes of nano-CuO are presently unknown but its broad use unavoidably entails its release into aquatic systems, where they inevitably come into contact with non-target, aquatic microorganisms (Nowack et al, 2012;Bondarenko et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of sub-lethal effects of nano-CuO on the microalga Chlamydomonas reinhardtii during short-term exposure

Moos

Maillard

2015

Aquatic Toxicology

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Structural, optical, and electronic properties of colloidal CuO nanoparticles formed by using a colloid-thermal synthesis process

Cited by 134 publications

References 25 publications

Green synthesis of copper oxide nanoparticles using gum karaya as a biotemplate and their antibacterial application

Green synthesis of copper oxide nanoparticles using gum karaya as a biotemplate and their antibacterial application

Effect of bath concentration on the growth and photovoltaic response of SILAR-deposited CuO thin films

Dynamics of sub-lethal effects of nano-CuO on the microalga Chlamydomonas reinhardtii during short-term exposure

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