Structural, FTIR and photoluminescence studies of Cu doped ZnO nanopowders by co-precipitation method

Muthukumaran, Shobha; Gopalakrishnan, R.

doi:10.1016/j.optmat.2012.06.004

Cited by 494 publications

(181 citation statements)

References 62 publications

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“…TABLE I Lattice parameters (a, c and c/a ratio), V is the volume of unit cell. It was also observed no identification of secondary peaks confirming single phase and complete solid solubility of Ca 2+ into ZnO lattice [8]. The change in lattice constant of ZnO is due to higher ionic radius of Ca 2+ (100 pm) incorporated into smaller ionic radius of Zn…”

Section: Structural Analysismentioning

confidence: 91%

“…The shifting of (101) X-ray peak towards lower diffraction angle for Ca doped ZnO is clearly shown in the inset figure which provides an indirect evidence that Ca is incorporated into ZnO crystal lattice. The average crystallite size has been estimated by the Scherrer equation [8] and are found to be 50 nm and 34 nm for x = 0, 0.01, respectively. Ca doped ZnO has reduced crystallite size and increased peak broadening due to the difference in ionic radii of two ions (Zn 2+ , Ca 2+ ) which cause lattice distortion in the crystal structure [10].…”

Section: +mentioning

confidence: 99%

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Temperature and Frequency Dependence Electrical Properties of Zn_1-xCa_xO Nanoceramic

Das

Parashar

et al. 2016

Acta Phys. Pol. A

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This work reports the temperature and frequency dependence electrical properties of Ca doped ZnO (Zn1−xCaxO, x = 0.01) nanoceramic synthesized by solid state reaction method. The X-ray spectra show that the synthesized powder has hexagonal wurtzite structure with space group P 63mc. The average crystallite size decreases with Ca doping. The increase in oxygen positional parameter (u) indicates lattice distortion in the crystal structure. Doping with Ca caused a slight shift in the (101) plane peak towards lower diffraction angle. The formation of pores in field emission scanning electron microscopy micrograph may be due to the defect created by Ca substitution. The electrical property was investigated by impedance spectroscopy in the temperature range 300-500• C. The synthesized sample shows temperature dependence relaxation phenomena and negative temperature coefficient of resistance effects. Electrical conductivity (σac) increases with increase in temperature as well as with frequency due to the drift mobility of electrons and hole by hopping conduction. Dielectric constant was found to decrease with increase in frequency and temperature. This decreases drastically in the magnitude of approximately < 10 times than the corresponding undoped one.

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Section: Structural Analysismentioning

confidence: 91%

Section: +mentioning

confidence: 99%

Temperature and Frequency Dependence Electrical Properties of Zn_1-xCa_xO Nanoceramic

Das

Parashar

et al. 2016

Acta Phys. Pol. A

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“…The transmission bands at 964, 852 are Zn-OH in-plane and out-of-plane bending modes while 670 cm −1 mode is attributed to Zn-O stretching vibration [31]. The 1143 cm −1 is attributed to Zn-OH stretching and the appearance of this peak shows the adsorption of water in the film from atmospheric moisture and hygroscopic nature of ZnCl 2 precursor [32]. 1633 cm −1 peak were assigned to water bending mode and 1973 cm −1 which arises from the absorption of atmospheric CO 2 on the metallic cations.…”

Section: Ftir Spectroscopymentioning

confidence: 96%

Investigation of physical properties of screen printed nanosized ZnO films for optoelectronic applications

Zargar

Arora

Hafiz

2015

Eur. Phys. J. Appl. Phys.

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Abstract. Nanosized ZnO particles derived from chemical co-precipitation route were used for casting ZnO films by screen printing method followed by sintering at two different temperatures. The variation in structural, optical and electrical properties of these films with temperature have been investigated by XRD, SEM, FTIR, Raman, UV-VIS, EPR and four probe analytical techniques. XRD patterns of these films exhibit polycrystalline nature with hexagonal wurtzite structure and SEM images reveal the smooth, dense and without any cracks/damage porous surface morphology. Infrared transmission spectra shows peaks pertaining to Zn-O stretching modes and their multiphonon modes. While Raman spectra exhibited strong peaks of E 2 (high) phonon and overtone of surface phonon mode at 429 cm −1 and 1144 cm −1 respectively with weak components of LO and TO branches. The direct band gap energy of these films showed narrowing of band gap from 3.21 eV to 3.12 eV on increasing sintering temperature from 500 • C to 600 • C. DC conductivity measurements confirmed semiconducting behaviour and showed lowering of activation energy. EPR spectra showed single narrow line resonance signal of g-value ∼ 1.9469 due to oxygen vacancies which are produced during synthesis of ZnO nanoparticles by sol-gel process. These studies revealed that on increasing sintering temperature the crystallinity of the film improves with reduction in lattice deformations in these screen printed ZnO films.

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“…Where, the two FTIR spectrums of ZnO nanoparticles and its polymeric hybrid showed identical characteristic peaks at about 551 cm -1 in case of pure ZnO which corresponds to the Zn-O bond stretching vibration that shifted to about 505 cm -1 for the polymeric hybrid [15]. The medium to weak bands at 889 cm -1 for pure ZnO and 852 cm -1 at ZnO polymeric hybrid are assigned to the vibrational frequencies due to the change in the micro-structural features into Zn-O lattice [16] The weak peaks sited at 1165 cm -1 and 1383 cm -1 for pure ZnO that shifted to 1064 cm -1 and 1392 cm -1 for polymeric hybrid were regarding the presence of C-O and C-H vibration modes of PVP, which acts as a capping agent for synthesis nano-zinc oxide [17]. The remaining peaks around 1600 cm -1 and 3400 cm -1 are due to normal polymeric O-H stretching vibration of the H 2 O small amount inside the ZnO nanocrystals.…”

Section: Figure 2 Ftir Analysis Of Zinc Oxide Nano-powder and The Famentioning

confidence: 99%

Formulation of nano-zinc oxide into biocomposite beads for dye decolorization

Elkady¹,

Shokry²,

El-Shazly³

2015

AIP Conference Proceedings

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A computational study of the structure of zinc fluoride surfaces AIP Conference Proceedings 1653, 020051 (2015) Abstract. Zinc oxide nano-powder was prepared using sol-gel technique to be encapsulated onto polymeric blend composed from alginate and polyvinyl alcohol to fabricate novel bio-composite beads of nano-zinc oxide. The XRD patterns of both zinc oxide nano-powder and its polymeric hybrid were crystalline in their nature. The FTIR analysis of the fabricated ZnO polymeric hybrid confirms the binding between zinc oxide and the polymeric matrix. The BET analysis demonstrated that the calculated specific surface area of the formulated ZnO beads that equal to 22.8 m 2 /g is comparatively less than that of the free ZnO nano-powdered that equivalent to 64.9 m 2 /g. The thermal stability of ZnO nano-powdered dramatically decreased with its immobilization into the polymeric alginate and PVA matrix. The formulated beads had very strong mechanical strength and they are difficult to be broken up to 1500rpm. Moreover, this hybrid beads are chemically stable at the acidic media. The formulated ZnO hybrid beads verified to be good adsorbent material for C.I basic blue 41 (CB41).

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Structural, FTIR and photoluminescence studies of Cu doped ZnO nanopowders by co-precipitation method

Cited by 494 publications

References 62 publications

Temperature and Frequency Dependence Electrical Properties of Zn_1-xCa_xO Nanoceramic

Temperature and Frequency Dependence Electrical Properties of Zn_1-xCa_xO Nanoceramic

Investigation of physical properties of screen printed nanosized ZnO films for optoelectronic applications

Formulation of nano-zinc oxide into biocomposite beads for dye decolorization

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Structural, FTIR and photoluminescence studies of Cu doped ZnO nanopowders by co-precipitation method

Cited by 494 publications

References 62 publications

Temperature and Frequency Dependence Electrical Properties of Zn1-xCaxO Nanoceramic

Temperature and Frequency Dependence Electrical Properties of Zn1-xCaxO Nanoceramic

Investigation of physical properties of screen printed nanosized ZnO films for optoelectronic applications

Formulation of nano-zinc oxide into biocomposite beads for dye decolorization

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Product

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Temperature and Frequency Dependence Electrical Properties of Zn_1-xCa_xO Nanoceramic

Temperature and Frequency Dependence Electrical Properties of Zn_1-xCa_xO Nanoceramic