Influence of the Substrate, Process Conditions, and Postannealing Temperature on the Properties of ZnO Thin Films Grown by the Successive Ionic Layer Adsorption and Reaction Method

Zinc oxide (ZnO) is one of the most promising metal oxide semiconductor materials, particularly for optical and gas sensing applications. The influence of thickness and solvent on various features of ZnO thin films deposited at ambient temperature and barometric pressure by the sequential ionic layer adsorption and reaction method (SILAR) was carefully studied in this work. Ethanol and distilled water (DW) were alternatively used as a solvent for preparation of ZnO precursor solution. Superficial morphology, crystallite structure, optical and electrical characteristics of the thin films of various thickness are examined applying X-ray diffraction (XRD) system, scanning electron microscopy, the atomic force microscopy, X-ray photoelectron spectroscopy, ultraviolet–visible spectroscopy, photoluminescence spectroscopy, Hall effect measurement analysis and UV response study. XRD analysis confirmed that thin films fabricated using ethanol or DW precursor solvents are hexagonal wurtzite ZnO with a preferred growth orientation (002). Furthermore, it was found that thin films made using ethanol are as highly crystalline as thin films made using DW. ZnO thin films prepared using aqueous solutions possess high optical band gaps. However, films prepared with ethanol solvent have low resistivity (10–2 Ω cm) and high electron mobility (750 cm2/Vs). The ethanol solvent-based SILAR method opens opportunities to synthase high quality ZnO thin films for various potential applications.

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“…There are a few studies 29 – 31 , where solvents such as ethylene, isopropyl alcohol, etc. were used in the process of obtaining ZnO by SILAR.…”

Section: Introductionmentioning

confidence: 99%

Effect of thickness and reaction media on properties of ZnO thin films by SILAR

Yergaliuly

Soltabayev

Kalybekkyzy

et al. 2022

Sci Rep

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“…In order to elucidate the mean crystallite domain size ( d) of the synthesized product, the Scherrer's equation (3.1) [ 43 ] was utilized.

where K is Scherrer's constant, equal to 0.94, λ is the wavelength of X-ray radiation used ( λ = 1.5406 Å), θ is the Bragg diffraction angle and β is the full width at half maximum (FWHM) in radiation.…”

Section: Resultsmentioning

confidence: 99%

“…It can be seen that diffraction peaks for product-A are slightly shifted to higher 2 θ values compared with that of product-B (indicated by the major diffraction peaks of Ca(OH) 2 denoted by dashed line in figure 6), which is presumably due to the stress–strain effect owing to the combined presence of Ca(OH) 2 and CaCO 3 . The lattice strain, ε of crystal at the plane *(101) and #(104) were determined using the following expression (3.2) [43]:ε =true0β4tanθ.The calculated value of the lattice strain was found to be 2.92 × 10 −3 (product-A) and 3.36 × 10 −3 (product-B) considering the plane *(101) of Ca(OH) 2 and 2.60 × 10 −3 (product-A) and 4.40 × 10 −3 (product-B) while considering the plane #(104) of CaCO 3 . In both cases, microstrain in product-B is higher than that of product-A.…”

Section: Resultsmentioning

confidence: 99%

Facile extraction and characterization of calcium hydroxide from paper mill waste sludge of Bangladesh

et al. 2022

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Herein, paper mill waste sludge (PMS) from two different sources has been investigated to extract calcium hydroxide, Ca(OH) 2 by a facile and inexpensive extraction process. PMS samples, collected from local paper mill plants of Bangladesh, were the main precursors wherein HCl and NaOH were used for chemical treatment. The as-synthesized products were analysed by a variety of characterization tools including X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) elemental analyses. Our studies confirm that the extracted product contains Ca(OH) 2 as a major content, albeit it also includes CaCO 3 phase owing to the inescapable carbonation process from the surrounding environment. The particle size of the synthesized products is in the range of 450–500 nm estimated from SEM micrographs. The crystallite domain size of the same estimated from XRD analyses and was found to be approximately 47 and 31 nm respectively for product-A and product-B considering major (101) Bragg peak of Ca(OH) 2 . The yield percentage of the isolated products is about 65% for samples collected from both sources.

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“…In order to elucidate the mean crystallite domain size (d ) of the synthesized product, the Scherrer's equation ( 1) [43] was utilized.…”

Section: Xrd Analyses Of Pms Source and Productsmentioning

confidence: 99%

“…CaCO3. The lattice strain, ε of crystal at the plane *(101) and #(104) were determined using the following expression (2) [43].…”

Section: Xrd Analyses Of Pms Source and Productsmentioning

confidence: 99%

Facile Extraction and Characterization of Calcium Hydroxide From Paper Mill Waste Sludge of Bangladesh

Molla¹,

Begum²,

Farhad³

et al. 2021

Preprint

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Herein, paper mill waste sludge (PMS) from two different sources has been investigated to extract calcium hydroxide, Ca(OH)2 by a facile and inexpensive extraction process. This green process exploits typical chemical precipitation (CP) in an aqueous medium at room temperature to develop an economically and industrially viable technique for the effective utilization of calcium-containing waste sludge. PMS samples, collected from local paper mill plants of Bangladesh, were the main precursors wherein HCl and NaOH were utilized for chemical treatment. The as-synthesized products were analyzed by a variety of characterization tools including X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, Scanning electron microscopy (SEM), and Energy Dispersive X-ray (EDX) elemental analyses. Our studies confirm that the extracted product contains Ca(OH)2 as a major content, albeit it also includes CaCO3 phase formed owing to the inescapable carbonation process from the surrounding environment. The particle size of the synthesized products is in the range of 450 - 500 nm estimated from SEM micrographs. The crystallite domain size of the same estimated from XRD analyses and was found to be ~47 nm and ~31 nm respectively for product-A and product-B considering major (101) Bragg peak of Ca(OH)2. The yield percentage of the isolated products is about 65% for samples collected from both sources.

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Influence of the Substrate, Process Conditions, and Postannealing Temperature on the Properties of ZnO Thin Films Grown by the Successive Ionic Layer Adsorption and Reaction Method

Cited by 56 publications

References 65 publications

Effect of thickness and reaction media on properties of ZnO thin films by SILAR

Effect of thickness and reaction media on properties of ZnO thin films by SILAR

Facile extraction and characterization of calcium hydroxide from paper mill waste sludge of Bangladesh

Facile Extraction and Characterization of Calcium Hydroxide From Paper Mill Waste Sludge of Bangladesh

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