Characterisation and Optical Studies of Copper Oxide Nanostructures Doped with Lanthanum Ions

Varughese, George; Rini, V.; Suraj, S.; Usha, K.T.

doi:10.2478/adms-2014-0021

Cited by 54 publications

(29 citation statements)

References 24 publications

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“…The formation of CuONPs was registered from the color change in the solutions, from blue to dark green, corresponding to the formation of CuONPs. UV-Vis analysis showed the plasmon band absorption in Fig 1A corresponding for CuONPs, according to the previous work of Varughese, G. et al [16]. which attributed the formation of cupric oxide nanoparticles to an excitonic absorption peak at 280 nm.…”

Section: Resultssupporting

confidence: 83%

Antifungal susceptibility of Candida species to copper oxide nanoparticles on polycaprolactone fibers (PCL-CuONPs)

Muñoz-Escobar

Reyes-López

2020

PLoS ONE

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The integration of metallic or ceramic nanoparticles in polymer matrices has improved the antimicrobial and antifungal behavior, resulting in the search for composites with increased bactericidal and antimycotic properties. A polycaprolactone fibers with copper oxide nanoparticles was prepared. Polycaprolactone-copper fibers (PCL-CuONPs) were prepared into two major steps in situ method: (a) Synthesis of CuO particles, then (b) incorporation of polycaprolactone to electrospun process. The first step is the reduction of Cu+2 ions by gallic acid in N,N-dimethylformamide and tetrahydrofuran solution with the simple addition of polycaprolactone in the solution for the second electrospun step. Raman spectra provide information about the nature of the copper oxide synthesized. There are three Raman peaks in the sample, at 294 and 581 cm-1 and a very broad band from 400 to 600 cm-1 which are characteristics bands for CuO. Scanning electron microscopy (TEM) revealed copper oxide nanoparticles with semispherical shapes with diameter 35 ±11 nm. Dynamic light scattering (DLS) analysis showed uniform CuONPs in a range of 88±11 nm. Scanning electron microscopy (SEM) of PCL-CuONps reveled fibers with diameters ranging from 925 to 1080 nm were successfully obtained by electrospinning technique. Orientation, morphology and diameter were influenced by the increment on CuONPs concentration, with the smaller diameter present in samples prepared from low concentrated solutions. The antimycotic applicability of the composite was evaluated to determine the antifungal activity in three species of the genus Candida (Candida albicans, Candida glabrata and Candida tropicalis). PCL-CuONPs exhibit a considerable antifungal effect on all species tested. The preparation of PCL-CuONPs was simple, fast and low-cost for practical application as an antifungal dressing.

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Section: Resultssupporting

confidence: 83%

Antifungal susceptibility of Candida species to copper oxide nanoparticles on polycaprolactone fibers (PCL-CuONPs)

Muñoz-Escobar

Reyes-López

2020

PLoS ONE

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“…In addition, the reduction in copper nanodot size that causes structural disorder in zinc oxide lattice. This behavior is in agreement with the reported studies in literature [25,26]. Figure 7a shows the photoluminescence spectrum of samples deposited using Zn-Zn, Zn-Cu and Cu-Cu electrode pairs.…”

Section: Optical Propertiessupporting

confidence: 92%

Cu Doping Induced Structural and Optical Properties of Bimetallic Oxide Nanodots by the Vertical Spark Generation

et al. 2019

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Undoped ZnO and Cu doped ZnO nanodots (NDs) were synthesized by the modified sparking technique with the Zn and Cu metal electrode pairs such as Zn-Zn, Zn-Cu and Cu-Cu. The effect of deposition geometry on the structural, optical properties and band gap energy were examined. The X-ray diffraction (XRD) analysis demonstrates that the nanodots have the hexagonal wurtzite structure, and visible considerable shift in the peaks position can be linked with the influence of Cu. However, when copper electrode was used, some copper oxide phases, metallic copper and paramelaconite phases were observed. From the results, the average diameters of metal oxide nanodots are about 25 nm and 50 nm which were obtained by using Cu-Cu and for Zn-Zn electrodes respectively from the scanning electron microscopy (SEM) analysis. When the Zn-Cu electrode pairs were used, the mixture of nanorod and nanodots appeared. It was observed that the island growth occurs in the horizontal geometry of electrode pairs and the growth metal oxide species are more strongly bonded to each other than to the substrate. But, these nanodots have more uniform distribution in the vertical geometry of electrodes. Optical studies indicated that the band gap decreased (red shift) when the Cu electrode was used.

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“…The FT-IR of copper oxide (control) has showed only one peak at 619/cm, which was mainly due to Cu (II)-O stretching vibrations peak [45]. Contrarily in treated copper oxide sample, this absorption peak was observed at higher wavenumber, 629/cm that may have been due to a reduction in particle size or strengthening of Cu-O bond through biofield treatment [46].…”

Section: Ft-ir Spectroscopymentioning

confidence: 99%

Studies of the Atomic and Crystalline Characteristics of Ceramic Oxide Nano Powders after Bio field Treatment

Trivedi¹

2015

Ind Eng Manage

143

121

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Transition metal oxides (TMOs) have been known for their extraordinary electrical and magnetic properties. In the present study, some transition metal oxides (Zinc oxide, iron oxide and copper oxide) which are widely used in the fabrication of electronic devices were selected and subjected to biofield treatment. The atomic and crystal structures of TMOs were carefully studied by Fourier transform infrared (FT-IR) spectroscopy and X-ray diffraction (XRD) studies. XRD analysis reveals that biofield treatment significantly changed the lattice strain in unit cells, crystallite sizes and densities in ceramics oxide powders. The computed molecular weight of the treated samples exhibited significant variation. FT-IR spectra indicated that biofield treatment has altered the metal-oxygen bond strength. Since biofield treatment significantly altered the crystallite size, lattice strain and bond strength, we postulate that electrical and magnetic properties in TMOs (transition metal oxides) can be modulated by biofield treatment.

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Characterisation and Optical Studies of Copper Oxide Nanostructures Doped with Lanthanum Ions

Cited by 54 publications

References 24 publications

Antifungal susceptibility of Candida species to copper oxide nanoparticles on polycaprolactone fibers (PCL-CuONPs)

Antifungal susceptibility of Candida species to copper oxide nanoparticles on polycaprolactone fibers (PCL-CuONPs)

Cu Doping Induced Structural and Optical Properties of Bimetallic Oxide Nanodots by the Vertical Spark Generation

Studies of the Atomic and Crystalline Characteristics of Ceramic Oxide Nano Powders after Bio field Treatment

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