Effects of Na content on structural and optical properties of Na-doped ZnO thin films prepared by sol–gel method

Wang, L.W.; Wu, Fang; Tian, Dexiang; Li, W.J.; Fang, Liang; Kong, Chunyang; Zhou, Ming

doi:10.1016/j.jallcom.2014.11.055

Cited by 111 publications

(41 citation statements)

References 41 publications

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“…Moderate metal (Na, Cu) dopants were conducive to improve preferential c-axis orientation of the thin films. Similar effect of Na content on the intensity of the (002) peak of Na-doped ZnO has also been reported by other researchers [16,26]. Liu et al reported that moderate Cu-doping can promote the preferential (002) orientation, while heavy doping can inhibit it.…”

Section: Resultssupporting

confidence: 83%

“…When Na was doped into the ZnO and doping content was 0.1, intensity of the UV emission Plots of (ahm) 2 versus hm of Na x Cu y Zn 1-x-y O thin films increases but intensity of the visible emission band decreases. It was also found that the UV emission could be enhanced and the visible emission could be reduced by doping moderate Na [16] or K [41]. Wang et al thought that the result would be attributed to the suppressing of V O defects by the Na doping and the passivation of present V O defects by the formation of (Na Zn -V O ) ?/0 complexes [16].…”

Section: Resultsmentioning

confidence: 99%

“…It suggested that absence of the (Na or Cu)-related cluster within the detection limit. Average grain size of the thin film is calculated after appropriate background correction by using DebyeScherrer's formula [16]:…”

Section: Methodsmentioning

confidence: 99%

“…Potential applications in optoelectronics device necessitate better understanding of the factors controlling the structural and optical properties of ZnO films. Due to the different electronic shell structure and the similar size of Na and Zn, the Na element has been considered as a good candidate to modify the structural, optical and electronic properties of ZnO [14][15][16]. Cu has an electronic shell structure similar to that of Zn and can influence the band gap of ZnO.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure, surface morphology and optical properties of Na x Cu y Zn1−x−y O thin films

Zhao

et al. 2015

J Mater Sci: Mater Electron

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Na x Cu y Zn 1-x-y O thin films were prepared by sol-gel method on quartz glass. The effect of Na (or Cu) doping on the microstructure, surface morphology, optical properties of the thin films was investigated. The Na 0.1 Cu 0.01 Zn 0.89 O thin film has the largest average grain size and the best preferential c-axis orientation, which may be attributed to the difference in ionic radius between Zn and Na (or Cu). The Na 0.1 Cu 0.01 Zn 0.89 O thin film also presents denser morphology with little voids and the smallest optical band gap, which may be attributed to band edge bending and the larger grain size. The largest intensity of A 1 (LO) modes may be due to the major structural defect concentrations. The quenching of UV and visible emissions, which may be attributed to the increase of non-radiative recombination transition, has been observed in the Na 0.1 Cu 0.01 Zn 0.89 O and Na 0.1-Cu 0.02 Zn 0.88 O thin films.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure, surface morphology and optical properties of Na x Cu y Zn1−x−y O thin films

Zhao

et al. 2015

J Mater Sci: Mater Electron

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“…82 The three lowest density of the surface free energy is 9.9, 12.3 and 20.9 eV nm À2 for (002), (110) and (100) plans, respectively. 87 The preferred orientation along (002) direction seen in ZnO lms signicantly decreased aer 8 h deposition time and pH value 6.5. This means that the crystallinity deterioration leads to increase of the surface free energy of the lms at higher pH value and hence reducing Q values.…”

mentioning

confidence: 98%

Nanostructured ZnO thin films for self-cleaning applications

2017

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Controlling the properties of nanostructured zinc oxide (ZnO) is an interesting way to broaden its multifunctionality. ZnO nanostructured films were grown on glass substrates under different conditions by a simple two-step wet chemical method. A low-cost successive ionic layer adsorption and reaction (SILAR) method was used to grow ZnO seed layers at 80 C. Then, different hierarchical based ZnO nanostructured thin films were deposited onto the ZnO seed layers by chemical bath deposition (CBD).The influence of deposition time (t D ) and pH on the surface morphology, wettability behavior, structural and optical properties of the ZnO nanostructured films were systematically investigated. The structural, morphological, optical and wetting properties were studied by X-ray diffraction (XRD), field emission scanning microscopy (FE-SEM), UV-Vis spectrophotometer, and water contact angle (WCA) measurement, respectively. The surface morphology revealed a complex and orientated hierarchical based ZnO nanostructured films with diverse shapes from hexagonal nanorods to hexagonal nanoplates and even much more complex plates/rods and flower-like shapes by changing deposition time and pH of the precursor. XRD results confirm the synthesis of nanostructured ZnO of the hexagonal structure with a preferential orientation along the (002) lattice plane. The average crystallite size, D, is altered between 41.41 to 68.43 nm dependent on the morphology of the ZnO film and pH of the precursor. At pH 6.5, the films are hydrophilic for 10 h # t D # 6 h and hydrophobic for 6 h < t D < 10 h. The wetting properties of the films were enhanced by increasing or decreasing pH around 6.5. Morphology and thickness of the ZnO nanostructure could efficiently control the transmittance, absorbance, optical band gap, and the extinction coefficient of the films. The optical band gap is blue shifted from 2.45 to 3.62 eV@pH 6.5 as the deposition time increased from 2 to 8 h and blue shifted from 2.72 to 3.62 eV@8 h as the pH value increased from 5.5 to 6.5. The existence of stable hydrophobic zinc oxide nanostructured films at room temperature at a large-scale and with band gaps around 3.62 eV supports their use in selfcleaning and gas sensing applications.

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A DFT+U Study of CO and H₂ Adsorption Properties on Ga, Li, and Cu Doped ZnO Surfaces

Thang

2023

ChemNanoMat

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Doping heteroatoms is an efficient method for enhancing the electronic properties of ZnO materials in order to apply them to the desired applications. This study compares the effect of various dopant metals on the electronic and adsorption properties of ZnO 10true1‾0 ${\left(10\bar{1}0\right)}$ using DFT+U calculations. Metal dopants including n‐type Ga (IIIA metal), p‐type Li (IA metal), and equivalent valance metal Cu are thought to be substituted in the Zn lattice at both the surface (Znsur) and subsurface (Znsub) sites. To evaluate the electronic structure of doped ZnO 10true1‾0 ${\left(10\bar{1}0\right)}$ and the adsorption properties of CO and H2 on doped ZnO 10true1‾0 ${\left(10\bar{1}0\right)}$ , the Bader charge, density of state, spin density, charge density difference, adsorption energy, and vibrational frequency are calculated. The computed findings demonstrate that, among the investigated dopants, Cu dopant significantly enhances the adsorption characteristics of ZnO materials. This research will be useful in designing appropriate materials for adsorption and catalytic applications.

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Effects of Na content on structural and optical properties of Na-doped ZnO thin films prepared by sol–gel method

Cited by 111 publications

References 41 publications

Microstructure, surface morphology and optical properties of Na x Cu y Zn1−x−y O thin films

Microstructure, surface morphology and optical properties of Na x Cu y Zn1−x−y O thin films

Nanostructured ZnO thin films for self-cleaning applications

A DFT+U Study of CO and H₂ Adsorption Properties on Ga, Li, and Cu Doped ZnO Surfaces

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Effects of Na content on structural and optical properties of Na-doped ZnO thin films prepared by sol–gel method

Cited by 111 publications

References 41 publications

Microstructure, surface morphology and optical properties of Na x Cu y Zn1−x−y O thin films

Microstructure, surface morphology and optical properties of Na x Cu y Zn1−x−y O thin films

Nanostructured ZnO thin films for self-cleaning applications

A DFT+U Study of CO and H2 Adsorption Properties on Ga, Li, and Cu Doped ZnO Surfaces

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A DFT+U Study of CO and H₂ Adsorption Properties on Ga, Li, and Cu Doped ZnO Surfaces