Synthesis and characterization of Mn and Co codoped ZnO nanoparticles

Abdullahi, Sabiu Said; Köseoğlu, Yüksel; Güner, S.; Kazan, S.; Kocaman, Bayram; Ndikilar, Chifu E.

doi:10.1016/j.spmi.2015.03.021

Cited by 52 publications

(26 citation statements)

References 28 publications

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“…(1) where α is linear absorption coefficient,υ is light frequency, and A is the proportionality constant. The power of the parenthesis, n is taken equal to 1/2 for direct band gap materials, the absorption coefficient α is determined using …………………………………………(2) where d is the thickness of the film, R and T are the reflectance and the transmittance respectively (Abdullahi et al, 2015) . …”

Section: Results and Discussion:-edx Measurement:-mentioning

confidence: 99%

Fabrication of Zno/Cu2o and Tio2/Cu2o Heterojunction Solar Cell Using Spray Pyrolysis Method.

BalarabeSuleiman¹,

Abdullahi²,

Ndikilar³

et al. 2017

IJAR

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Section: Results and Discussion:-edx Measurement:-mentioning

confidence: 99%

Fabrication of Zno/Cu2o and Tio2/Cu2o Heterojunction Solar Cell Using Spray Pyrolysis Method.

BalarabeSuleiman¹,

Abdullahi²,

Ndikilar³

et al. 2017

IJAR

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“…For this process, first, HF solution was prepared to clean p-Si wafer, and then, it was dipped into this solution left for 10 s. After that, to the clean p-Si wafer, RC-cleaning procedure was applied [10][11][12][13][14][15]. For this, process was used acetone, methanol, and deionized water, respectively, with an ultrasonic bath for 5-10 min [13][14][15][16][17][18]. After the chemically cleaning process is completed, Al ohmic contact was formed on the rear surface of the p-Si wafer with the use of VAKSIS thermal evaporator system at the pressure of 5 9 10 -5 T. On the other hand, to obtain Mn-doped ZnO homogeneous solution, 2-methoxethanol was used as a solvent and monoethanolamine (MEA) was used as a stabilizer.…”

Section: Methodsmentioning

confidence: 99%

Number-projected isovector neutron-proton pairing effect in odd mass nuclei

2014

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In this study, ZnO was doped with 0.01% Mn and it is grown on p-Si by the sol-gel spin-coating method. Obtained the thin film was studied that to understand the effect of 0.01% Mn-doping ratio on the optical and electrical properties of ZnO structure. In this context, first, the morphological structure of the thin film was studied with the use of atomic force microscopy (AFM). The surface structure was obtained homogeneous, and roughness and fiber size were calculated between 27.2-33.6 and 0.595-0.673 nm, respectively. Second, the optical properties were characterized via ultravioletvisible (UV-Vis) spectrophotometry. Third, the effect of light intensity on junction properties of the photodiode was studied. The current-voltage (I-V) of the photodiode was measured under dark and at the different intensities of illumination. Obtained results showed that the current of photodiode was increased with the intensity of illumination from 6.41 9 10 -7 to 5.32 9 10 -4 A. These results indicate that photocurrent under illumination is higher than the dark current. After that, the other parameters of the photodiode such as barrier height and ideality factor were determined from forwarding I-V plots using the thermionic emission model that the barrier height and the ideality factor were found 0.74 eV and 5.3, respectively. On the other hand, the capacitance-voltage (C-V) was measured at the different frequencies. The C-V characteristic shown that C-V characteristic of the photodiode was changed depends on increasing frequency. In addition, the interface density (D it ) value was decreased by increasing frequency too. Similarly, the serial resistance of the photodiode was also decreased by increasing frequency. Received all these results indicated that Mn-doped ZnO thin film sensitive to light and due to this property, it can be used for different optoelectronic applications as a photodiode and photosensor.

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“…ZnO has been studied extensively during last few decades due to variety of applications. The doping effect of different metal ions including transition metal [5][6][7][8][9][10] and rare earth [11][12][13] has been studied for its potential application in ultraviolet luminescence devices, light-emitting diodes, gas sensors, solar cell and transparent thin-film transistors. The ZnO nanoparticles exhibits luminescence in visible region with excitation carried out at different ultraviolet wavelength.…”

Section: Introductionmentioning

confidence: 99%

“…The experimental results of magnetic property in Codoped ZnO are quite controversial, giving rise to ferromagnetism or paramagnetic behaviour depending upon the preparation condition [8,14]. Ferromagnetism in Co-doped ZnO has been reported by different authors [15,16].…”

Section: Introductionmentioning

confidence: 99%

Investigations on absorption, photoluminescence and magnetic properties of ZnO: Co nanoparticles

Kumar

Pandey

2016

J Sol-Gel Sci Technol

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We have investigated the consequences of cobalt (Co) incorporation with different doping concentrations (0, 2, 4 and 6 %) on structural, optical and magnetic properties of ZnO nanoparticles. The results of X-ray diffraction spectra (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) pattern of single particle, energydispersive X-ray spectroscopy (EDS) and Fourier transform infrared (FT-IR) authenticate the substitution of cobalt and hexagonal crystal structure without any secondary phase formation of all the samples under investigation. The ultravioletvisible (UV-Vis) absorption study indicates that increase in Co concentration improves the visible region absorption (550-700 nm). The absorption edge of Co-doped ZnO shifts towards visible region with increase in Co concentration. The band gap of samples shows a red shift with increase in Co percentage. The photoluminescence (PL) study of the samples indicates that Co doping shifts the intense peak position of ZnO from violet to blue colour. The weak emission peak at 572 nm is also observed in all the samples. The emission is represented by chromaticity diagram. The room temperature magnetic properties have been studied using vibrating sample magnetometer (VSM). The room temperature magnetisation curve shows that an increase in Co concentration increases the linear behaviour of M-H loop. The magnetic susceptibility results indicate that all the samples have Curie-Weiss behaviour. The coercive field (H c ) and the remanence magnetisation (M r ) increase with Co doping concentration. Graphical Abstract Fig. M-H curve of pure and cobaltdoped ZnO nanoparticles at 300 K. Inset (a) shows absorption spectra, and inset (b) shows the emission spectra of Zn 1-x Co x O nanoparticles.

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Synthesis and characterization of Mn and Co codoped ZnO nanoparticles

Cited by 52 publications

References 28 publications

Fabrication of Zno/Cu2o and Tio2/Cu2o Heterojunction Solar Cell Using Spray Pyrolysis Method.

Fabrication of Zno/Cu2o and Tio2/Cu2o Heterojunction Solar Cell Using Spray Pyrolysis Method.

Number-projected isovector neutron-proton pairing effect in odd mass nuclei

Investigations on absorption, photoluminescence and magnetic properties of ZnO: Co nanoparticles

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