Preparation and Characterization of CuO Thin Films Prepared by Spray Pyrolysis 
 Technique for Ethanol Gas Sensing Application

Dhas, C. Ravi; Alexander, Dinu; Christy, Ashton; Jeyadheepa, K.; Raj, A. Moses Ezhil; Raja, C. Ramachandra

doi:10.3923/ajaps.2014.671.684

Cited by 17 publications

(6 citation statements)

References 19 publications

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“…and The crystallite size increases from 35 to 56 nm with the increase of molar concentration from 0.025 to 0.1 mol/L due to coalescence of grains. Similar results are reported by Dhas et al [19]. Abdelmounaïm et al [6] observed that the crystallite size of copper oxide films increased from 0.05 to 0.2 mol/L.…”

Section: Structural Propertiessupporting

confidence: 88%

“…Lower disorder incomes in less defect states present in the films. These E g values are higher than those given in the references [13,19,20]. Bhowmik et al [42], and Prakash et al [18] found that for copper oxide films produced by sol-gel and spray pyrolysis technique E g varied between 1.47 and 1.27 eV, and 1.5 and 2.03 eV versus precursor concentration respectively.…”

Section: Transmittance Reflectance Absorption Coefficient Optical Ene...mentioning

confidence: 66%

“…Based on the previous studies [6,[17][18][19], the investigation of optoelectronic properties especially the dielectric function of Tenorite is too few. Herein, in this paper, copper oxide thin layers were synthesized on glass substrate by spray pyrolysis technique (SPT).…”

Section: Introductionmentioning

confidence: 99%

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Optoelectronic and Dielectric Properties of Tenorite CuO Thin Films Sprayed at Various Molar Concentrations

Ben Messaoud,

Ouahab,

Rahmane

et al. 2024

Period. Polytech. Chem. Eng.

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The work in hand presents the elaboration of CuO thin films using a home-made spray pyrolysis technique at room atmosphere. The films were synthesized on preheated glass substrate at 450 °C. The source solution molarity was varied from 0.025 to 0.1 mol/L. The films were characterized by employing X-Ray Diffraction technique, UV-Vis-NIR spectrophotometry, Scanning Electron Microscope imagery, Energy Dispersive Spectroscopy, and four-points probe techniques. The X-ray diffraction analysis confirmed that all films are polycrystalline with a preferred orientation along the plane (−111) of the monoclinic crystal structure phase of tenorite (CuO). The SEM images showed a homogeneous and smooth surface. Crystallinity and grain size were improved. The rise of solution concentration induced a reduction of transmittance and reflectance in the visible region. The energy gap, the absorption coefficient, the extinction coefficient, refractive index, dielectric constant (ԑr and ԑi) and loss energy were estimated from transmittance and reflectance data. The gap energy decreases from 2.72 to 2.56 eV. The film deposited for 0.025 mol/L exhibits the highest real part of the dielectric constant (ԑr ~ 17). The film resistivity which is in order of 102 Ω cm decreases with the increase of molar concentration. The estimated dielectric constant indicated that the resulting CuO thin films could be used as dielectric layers for optoelectronic devices working in Vis-NIR region of radiation. Furthermore, the relatively high band gap, high absorption coefficient and high conductivity of the film obtained at 0.075 mol/L, make them good candidates as absorption layers in solar cells applications.

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Section: Structural Propertiessupporting

confidence: 88%

Section: Transmittance Reflectance Absorption Coefficient Optical Ene...mentioning

confidence: 66%

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Optoelectronic and Dielectric Properties of Tenorite CuO Thin Films Sprayed at Various Molar Concentrations

Ben Messaoud,

Ouahab,

Rahmane

et al. 2024

Period. Polytech. Chem. Eng.

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“…Coatings 2021, 11, 1392 2 of 10 Due to their physical properties, copper oxide (CuO) films have already been used in various fields of science and technology, such as the creation of lithium batteries [12], bio-and gas sensors [13], solar cells [14], capacitors [15], infrared photodetectors [16], catalysis [17], superconductivity [13], for the manufacture of various electrical and optical devices [18,19], etc. However, the most promising applications of CuO, as novel material, are gas sensors and photovoltaic solar cells [20,21].…”

Section: Introductionmentioning

confidence: 99%

Structural and Optical Properties of CuO Thin Films Synthesized Using Spray Pyrolysis Method

et al. 2021

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Copper oxide thin films were obtained using pulsating spray pyrolysis method. The morphological, structural, and optical properties of fabricated films were studied. X-ray analysis revealed that the CuO thin films are single-phase. The study of films morphology by SEM and AFM methods showed that the obtained films have a fairly high surface roughness and contain grains of different shapes and sizes. It was found that the obtained films of copper oxide have high values of the absorption coefficient, which confirms the possibility of their use as absorbing layers for solar cells. The obtained values of the optical band gap of the material are in the range from 1.45 eV to 1.60 eV. Raman spectroscopy revealed three modes A1g, B1g, and B2g, of the crystal structure of monoclinic CuO. The devices based on p-type copper oxide are promising for solar cells fabrication because they can reduce production costs, due to their low cost and inexpensive production methods compared to silicon solar cells fabrication.

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“…Indeed, PVD (physical vapor deposition) methods such as sputtering (RF or DC), thermal evaporation, thermal oxidation [10,11], molecular beam epitaxy, pulsed laser deposition and electron beam epitaxy have been used for the deposition of nanostructured Cu x O [1]. A typical CVD (chemical vapor deposition) methods, were widely used like spray pyrolysis or plasma spray techniques [12][13][14]. Besides, there are other chemical ways like the electrochemical process for the production of nano-copper oxides [15].…”

Section: Introductionmentioning

confidence: 99%

Impedance spectroscopy characterization of anisotropic nano-sculptured copper oxide Cu₂O thin films for optoelectronic applications

Akkari

Trabelsi

Abdelkader

et al. 2019

Semicond. Sci. Technol.

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In this work, we report a simple way of copper oxide Cu 2 O elaboration, by first depositing copper using thermal vacuum evaporation at different substrate angles. This technique is known as GLAD (glancing angle deposition). In order to obtain the oxide phase, the copper nanostructures obtained were annealed in air at 523 K for 2 h. After air annealing, the films were characterized by x-ray diffraction, scanning electron microscopy, four-point probe method and UV-vis-NIR spectrophotometry. XRD study showed that Cu 2 O phase was obtained. The optical direct band gap energies for Cu 2 O films calculated from optical absorption measurements are between 2.45 and 2.54 eV. Optical and electrical anisotropy versus the incident angle of the Cu 2 O thin films were reported. An enhancement of the birefringence was observed for the incident angle around 60°. Electrical properties of the Cu 2 O films were investigated by AC impedance spectroscopy over a wide range of temperature up to 468 K starting from room temperature in the frequency range 5Hz-13 MHz. Nyquist diagrams of all samples display two semicircles that highlight the influences of single nanocrystals and grain boundaries and interface as well as porosity of samples. Impedance analysis showed that the resistance decreased by increasing temperature. Both analysis of AC and DC conductivities showed that the conduction mechanism was assured by hopping between localized states.

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Preparation and Characterization of CuO Thin Films Prepared by Spray Pyrolysis Technique for Ethanol Gas Sensing Application

Cited by 17 publications

References 19 publications

Optoelectronic and Dielectric Properties of Tenorite CuO Thin Films Sprayed at Various Molar Concentrations

Optoelectronic and Dielectric Properties of Tenorite CuO Thin Films Sprayed at Various Molar Concentrations

Structural and Optical Properties of CuO Thin Films Synthesized Using Spray Pyrolysis Method

Impedance spectroscopy characterization of anisotropic nano-sculptured copper oxide Cu₂O thin films for optoelectronic applications

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Preparation and Characterization of CuO Thin Films Prepared by Spray Pyrolysis Technique for Ethanol Gas Sensing Application

Cited by 17 publications

References 19 publications

Optoelectronic and Dielectric Properties of Tenorite CuO Thin Films Sprayed at Various Molar Concentrations

Optoelectronic and Dielectric Properties of Tenorite CuO Thin Films Sprayed at Various Molar Concentrations

Structural and Optical Properties of CuO Thin Films Synthesized Using Spray Pyrolysis Method

Impedance spectroscopy characterization of anisotropic nano-sculptured copper oxide Cu2O thin films for optoelectronic applications

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Impedance spectroscopy characterization of anisotropic nano-sculptured copper oxide Cu₂O thin films for optoelectronic applications