Effect of film thickness and annealing temperature on the structural and optical properties of ZnO thin films deposited on sapphire (0001) substrates by sol–gel

Lin, Chen; Wang, Gui‐Gen; Zhang, Huayu; Sun, Rui; Kuang, Xu-Ping; Han, Jiecai

doi:10.1016/j.ceramint.2012.10.014

Cited by 49 publications

(11 citation statements)

References 30 publications

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“…An analysis of the absorption and the emission shows that the 3.28–3.30 eV PL in the region of the absorption edge is related to band–band transitions [41]. The 3.21–3.24 eV peaks are due to transitions in the band-tail states of ZnO [42].…”

Section: Resultsmentioning

confidence: 99%

Evolution of microstructure and related optical properties of ZnO grown by atomic layer deposition

Chaaya¹,

Viter²,

Bechelany³

et al. 2013

Beilstein J. Nanotechnol.

134

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SummaryA study of transmittance and photoluminescence spectra on the growth of oxygen-rich ultra-thin ZnO films prepared by atomic layer deposition is reported. The structural transition from an amorphous to a polycrystalline state is observed upon increasing the thickness. The unusual behavior of the energy gap with thickness reflected by optical properties is attributed to the improvement of the crystalline structure resulting from a decreasing concentration of point defects at the growth of grains. The spectra of UV and visible photoluminescence emissions correspond to transitions near the band-edge and defect-related transitions. Additional emissions were observed from band-tail states near the edge. A high oxygen ratio and variable optical properties could be attractive for an application of atomic layer deposition (ALD) deposited ultrathin ZnO films in optical sensors and biosensors.

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Section: Resultsmentioning

confidence: 99%

Evolution of microstructure and related optical properties of ZnO grown by atomic layer deposition

Chaaya¹,

Viter²,

Bechelany³

et al. 2013

Beilstein J. Nanotechnol.

134

View full text Add to dashboard Cite

show abstract

“…A number of synthesis routes have been developed to prepare ZnO materials. These include electrochemical, 20 sol-gel, 21 hydrothermal, 14,22 and sonochemical 23 methods that result in ZnO nanoparticles or films of various features. Due to the mild reaction condition and uniform reaction system, hydrothermal method has been shown to enable preparation of uniform microstructure.…”

Section: Introductionmentioning

confidence: 99%

Effect of zinc oxide film morphologies on the formation of Shewanella putrefaciens biofilm

et al. 2017

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Zinc oxide (ZnO) films were prepared on aluminum substrate by a hydrothermal method to investigate the effect of their surface characteristics, including morphology and hydrophobicity, on the corresponding antibiofilm performance. The surface characteristics of the prepared ZnO films were examined by a comprehensive range of methodologies, suggesting that films of distinctive surface morphologies were successfully formed. Subsequently, their antibiofilm activities, using Shewanella putrefaciens as a model bacterium, were assessed. Surface measurements confirmed that the ZnO films equipped with a nanoscopic needlelike surface feature are more hydrophobic than those possessing densely packed microflakes. The reduced number of live cells and presence of biofilm, confirmed by optical and electron microscopy results, suggest that the former films possess an excellent antibiofilm performance. It is believed that the engineered nanoscopic needle feature might penetrate the cell membrane when they are in contact, allowing the effective substance of ZnO antibacterial ingredients to diffuse into the embedded bacteria. Furthermore, such surface characteristics might perturb the integrity of the cell membrane causing the intracellular substance is leaked from the cells. As such, the combinatorial effects of nanoscopic feature resulted in an inhibited growth of S. putrefaciens biofilm on ZnO film.

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“…Although the sol-gel method is a relatively simple technique for depositing ZnO thin films, there are still some factors affecting the properties of the prepared films. The factors including sol aging time, sol concentration 23 , heat-treatment conditions, substrate 24 , film thickness 25 …”

mentioning

confidence: 99%

Morphological, Structural and Optical Properties of ZnO Thin Films Deposited by Dip Coating Method

et al. 2016

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Zinc oxide (ZnO) thin films were deposited on glass substrat by dip coating technique. The effects of sol aging time on the deposition of ZnO films was studied by using the field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), and optical transmission techniques. The morphology of the films strongly depends on preparation route and deposition technique. It is noteworthy that films deposited from the freshly prepared solution feature indistinct characteristics; had relatively poor crystalline quality and low optical transmittance in the visible region. The increase in sol aging time resulted in a gradual improvement in crystallinity (in terms of peak sharpness and peak intensity) of the hexagonal phase for all diffraction peaks. Effect of sol aging on optical transparency is quite obvious through increased transmission with prolonged sol aging time. Interestingly, 72-168 h sol aging time was found to be optimal to achieve smooth surface morphology, good crystallinity and high optical transmittance which were attributed to an ideal stability of solution. These findings present a better-defined and more versatile procedure for production of clean ZnO sols of readily adjustable nanocrystalline size.

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Effect of film thickness and annealing temperature on the structural and optical properties of ZnO thin films deposited on sapphire (0001) substrates by sol–gel

Cited by 49 publications

References 30 publications

Evolution of microstructure and related optical properties of ZnO grown by atomic layer deposition

Evolution of microstructure and related optical properties of ZnO grown by atomic layer deposition

Effect of zinc oxide film morphologies on the formation of Shewanella putrefaciens biofilm

Morphological, Structural and Optical Properties of ZnO Thin Films Deposited by Dip Coating Method

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