Effect of pH on the synthesis of CuO films by SILAR method

Gençyılmaz, Olcay; Taşköprü, T.

doi:10.1016/j.jallcom.2016.10.247

Cited by 33 publications

(10 citation statements)

References 40 publications

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“…SILAR-fabricated CuO films were also fabricated from precursor solutions of varying pH (9, 9.5, and 10) and the changes in the physical properties of films were assessed. [57] In terms of crystallinity, samples show a general trend of increasing crystallinity with decreasing pH, even if the range investigated in this study is rather narrow. The crystallite size increased drastically in samples prepared at the lowest pH, which was also accompanied by a slight reduction in bandgap energy, and a sharper band edge.…”

Section: Phmentioning

confidence: 59%

“…Laukaitis et al pinpointed the reason of variation in the residual stress level after reaching optimum thickness to a transition from a 2D to a 3D growth. [54] Factors such as solution concentrations, [55,56] the pH of ionic solutions, [57] pH of rinsing solutions, solution temperatures and residence times in solutions [58] have been shown to directly affect the properties of the resultant thin films. [44,59] Therefore, the optimal deposition parameters should be determined for each system in relation to the materials and solvents adopted.…”

Section: Fundamentals and Theoretical Backgroundmentioning

confidence: 99%

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SILAR Deposition of Metal Oxide Nanostructured Films

Ratnayake

Ren

Colusso

et al. 2021

Small

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Methods for the fabrication of thin films with well controlled structure and properties are of great importance for the development of functional devices for a large range of applications. SILAR, the acronym for Successive Ionic Layer Adsorption and Reaction, is an evolution and combination of two other deposition methods, the Atomic Layer Deposition and Chemical Bath Deposition. Due to a relative simplicity and low cost, this method has gained increasing interest in the scientific community. There are, however, several aspects related to the influence of the many parameters involved, which deserve further deepening. In this review article, the basis of the method, its application to the fabrication of thin films, the importance of experimental parameters, and some recent advances in the application of oxide films are reviewed. At first the fundamental theoretical bases and experimental concepts of SILAR are discussed. Then, the fabrication of chalcogenides and metal oxides is reviewed, with special emphasis to metal oxides, trying to extract general information on the effect of experimental parameters on structural, morphological and functional properties. Finally, recent advances in the application of oxide films prepared by SILAR are described, focusing on supercapacitors, transparent electrodes, solar cells, and photoelectrochemical devices.

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Section: Phmentioning

confidence: 59%

Section: Fundamentals and Theoretical Backgroundmentioning

confidence: 99%

SILAR Deposition of Metal Oxide Nanostructured Films

Ratnayake

Ren

Colusso

et al. 2021

Small

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“…In both cases a proper formation of lms cannot be achieved. In this regard, various literature studies reported different synthesis parameters with respect to pH values in the formation of CuO thin lms by SILAR method: Yüksel et al [19], Daoudi et al [20] and Mageshwari et al [21] have adjusted the pH value at about 11.0 while Bayansal et al [22], Gençyılmaz et al [23] and Dinc et al [24] have reported a proper synthesis of CuO lms at pH = 10.0, pH = 9.0 and pH = 5.4, respectively. In this work, pH = 10.8, 11.0, 11.2 and 11.4 were attempted in the synthesis of CuO thin lms and a proper CuO layer formation was achieved at all attempted pH values.…”

Section: Role Of Ph In the Chemical Synthesis Of Zno/cuo Heterostruct...mentioning

confidence: 99%

Critical effect of reaction pH on the microstructural, optical and electrical behavior of ZnO/CuO hetero-structured nanocomposite films

Ajjaq²,

Ateş³

et al. 2022

Preprint

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CuO nanocomposite films and ZnO/CuO nano-heterostructures were synthesized by a series of chemical reactions at different pH values based on the hydrothermal and SILAR (successive ionic layer adsorption and reaction) methods. The ultimate purpose of this work is to explore the impacts of solution pH value and ZnO-based heterostructure on the structural, optical and electrical features of CuO films using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), transmittance spectrum, current-voltage (I-V) measurements and capacitance-conductance (C-G) measurements in 300–600 K temperature range and 20 Hz–1.5 MHz frequency range. XRD analysis revealed that the crystallite size and strain lattice parameters decrease with the increase in pH value without affecting the crystalline structure of the synthesized films. SEM images revealed the regular growth of ZnO structure without any deterioration in the CuO substrate layer where an increase in the thickness of the formed rods was observed with the increase in reaction pH value. Transmittance dropped greatly with the formation of heterojunction from about 40% (for CuO) to about 1% (for ZnO/CuO) in the visible range followed by a crystallite size-induced change in bandgap from 2.29 eV to 2.32 eV (for CuO) and from 2.03 eV to 2.11 eV (for ZnO/CuO). The increase in pH from 11.0 to 11.2 increased the room-temperature resistance of ZnO/CuO composites from 377 MΩ to 474 MΩ, the ideality factor from 4.41 to 4.68 and the barrier height from 0.74 eV to 0.83 eV. It can be deduced that reaction pH value is an important synthesis parameter that can tune the structural, morphological, optical and electrical properties of ZnO/CuO nanocomposite films for advanced industrial or technological implementations by controlling the nucleation and crystal growth rates during chemical synthesis processes.

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“…Se añadió gota a gota NH 4 OH (28 %) a una solución hasta pH 9.5 con la formación del complejo de amoníaco de cobre [Cu(NH 3 ) 4 ] 2+ . Los sustratos se sumergieron en el complejo [Cu(NH 3 ) 4 ] 2+ durante 20 s. Luego se sumergieron en 100 mL de agua destilada calentada a 85-90 • C durante 20 s. Se forma una capa de Cu(OH) 2 como resultado de la reacción de los iones OH − con los iones Cu 2+ adsorbidos en el sustrato [25]. Esto completa un ciclo SILAR de formación de película de Cu(OH) 2 .…”

Section: Experimental Preparación De Película Fina De Cuo Y Caracterización De Microestructurasunclassified

HUMIDITY SENSOR USING CuO NANORICES THIN FILM

Perillo

Rodriguez²

2021

AnAFA

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In this paper, a humidity sensor based on CuO has been successfully fabricated. Thin-film of CuO nanorices were synthesized by Successive Ionic Layer Adsorption and Reaction (SILAR) method on silicon wafer with Si3N4thinlayer as a substrate. The microstructure and morphology of the samples were investigated using X-ray diffraction(XRD) and scanning electron microscopy (SEM). Humidity sensing properties of the thin films have been studied. The sensing response has been measured in the relative humidity (RH) range from 20 up to 80 % at room temperature. It was found that impedance of the system decreases as the RH was increased. The prepared sensor revealed good reversibility with response and recovery time of 130 s and 320 s respectively. The complex impedance spectra were analyzed in the range of 0.1 to 1 kHz. This type of humidity sensor can be used as a new generation of ecological sensors with low cost and good stability. It makes the sensor a candidate for practical applications.

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Effect of pH on the synthesis of CuO films by SILAR method

Cited by 33 publications

References 40 publications

SILAR Deposition of Metal Oxide Nanostructured Films

SILAR Deposition of Metal Oxide Nanostructured Films

Critical effect of reaction pH on the microstructural, optical and electrical behavior of ZnO/CuO hetero-structured nanocomposite films

HUMIDITY SENSOR USING CuO NANORICES THIN FILM

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