Growth of undoped ZnO thin films by spray pyrolysis: effect of precursor concentration

Meryem, Lamri Zeggar; Touidjen, Nour El Houda; Aida, M.S.; Aouabdia, N.; Rouabah, Sawsen

doi:10.1007/s12596-022-01079-5

Cited by 10 publications

(5 citation statements)

References 34 publications

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“…The transmittance of all films reduced suddenly between 300 and 400 nm due to the fundamental absorption edge caused by the transition between the valence band and conduction band. This edge is used to compute the film optical band gap E g , which is measured by the following relationships [27,28]:…”

Section: Resultsmentioning

confidence: 99%

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The Effect of Co and Cu Co-Doping Zno Thin Films on Structural and Optical Properties

Saoud,

Benramache,

Diha

2023

Chemistry-Didactics-Ecology-Metrology

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Using a spray pneumatic technique, cobalt (Co) and copper (Cu) co-doped zinc oxide thin films were effectively deposited on a glass substrate. The goal of this work was to create a semiconductor with good optical and electrical properties by co-doping ZnO thin films with Cu and Co. The ZnO thin films obtained from the Co and Cu co-doping exhibit patterns of x-ray diffraction spectra that suggest they are hexagonal ZnO (wurtzite, JCPDS 36-1451). The thin film elaborated with 2 % Co and 7 % Cu has the lowest value of crystallite size (D = 14.67 nm). The transmission spectra demonstrate that all films have good optical transparency in the visible spectrum, with 7 % Cu achieving the highest transmission. Increasing Cu contents raised the band gap energy. The value at the minimum was 3.31 eV. The optical band gap’s broadening is a significant characteristic of advanced materials and may be useful in applications involving metal oxide nanostructures for visible light gas sensing.

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Section: Resultsmentioning

confidence: 99%

“…where A is the absorbance of sprayed thin films, α is the coefficient of absorption, T is the transmission of sprayed thin films, C is a constant, d is the film thickness, hυ is the photon energy [eV] hυ = 1240/λ. However, the following equation was used to determine the disorder or Urbach energy E u [26,27]:…”

Section: Resultsmentioning

confidence: 99%

The Effect of Co and Cu Co-Doping Zno Thin Films on Structural and Optical Properties

Saoud,

Benramache,

Diha

2023

Chemistry-Didactics-Ecology-Metrology

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“…The calculation of the structural parameters of the produced nanostructures was made using XRD data, the Debye-Scherrer formula given in equation (1) and the dislocation formula given in equation (2), and the results obtained are given in table 2 [68,69]. where D, K, λ, β and θ represent the average crystallite size, Scherrer constant (general value was used for this study; 0.94), the wavelength of the X-ray used, the full width at half maximum of the XRD diffraction peak (FWHM) and the Bragg diffraction angle, while δ represents the dislocation density.…”

Section: Structural Analysismentioning

confidence: 99%

Improved humidity sensing performances of boron doped ZnO nanostructured thin films depending on boron concentration

Algün,

Alshater,

Akçay

2024

Phys. Scr.

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This study details the production and analysis of undoped zinc oxide (uZnO) and boron (B) doped zinc oxide nanostructured thin films, with a specific focus on assessing the influence of varying B doping concentrations on humidity sensing performance. The synthesis of undoped ZnO and B doped ZnO nanoparticles was carried out using sol-gel method. B doping concentrations within the ZnO lattice were adjusted to 1, 3, 4, 5, and 10 mol%. Subsequently, nanostructured thin films were obtained through the spin coating technique on glass substrates. X-ray diffraction analysis revealed a hexagonal wurtzite structure for all nanostructured thin films. Notably, a change in preferential orientation from the (002) plane to the (100) plane occurred when B doping concentration exceeded 5 mol%. Scanning electron microscopy showcased nano-sized grains and capillary nanopores on the surface of each thin film. Energy dispersive X-ray spectra confirmed the presence of zinc, oxygen, and boron elements in the nanostructured thin films. Humidity sensing performance was assessed through electrical resistance measurements in the range of 45–90% relative humidity at room temperature. All fabricated sensors exhibited sensitivity to humidity. Remarkably, the sensor with a 5 mol% B doping concentration demonstrated the highest humidity sensitivity (438.44 times) and the fastest response (2.0 s) and recovery times (14.2 s). The study concluded that the optimal B doping concentration for designing a highly efficient humidity sensor was determined to be 5 mol%. Overall, the study underscores the potential of B doped ZnO nanostructures for humidity sensor applications, given their exceptional sensor performance.

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“…Various methods like sol-gel [12], hydrothermal [13], spray pyrolysis [14][15][16], coprecipitation andsolid state reaction [17] have been used for synthesis of Ti:ZnO nanoparticles and its optical, structural and morphological properties are studied [6,[18][19][20][21]. For, both photocatalytic and anti-microbial activity the morphology of the nanoparticles plays a vital role [22], hence it is imperative to conduct these studies on same type of nanoparticles in order to establish their effectiveness for both the applications.…”

Section: Introductionmentioning

confidence: 99%

Ti doped ZnO nanoparticles for photocatalytic hydroxyl radical generation under UV light for improved dye degradation and antimicrobial activity

Srinivas,

Verma,

Rao

et al. 2024

Preprint

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Photocatalysts are emerging as promising material for various light driven chemical reactions for the applications ranging from fuel generation to pollutant degradation. In this study, we synthesized ZnO and Ti doped ZnO (Ti:ZnO) nanoparticles inpropanol using sol-gel method with 2 -12.8atomic percents (at.%) of Ti doping in Ti:ZnO.The composition and optical response of the nanoparticleswere studied using energy dispersive spectroscopy (EDS) and diffuse reflectance spectroscopy respectively.The morphological and crystalline quality of the nanoparticles were reported using high resolution scanning electron microscopy (HRSEM) andX-ray diffraction (XRD) respectively.The role of Ti doping on crystallinity, photocatalytic response and anti-microbialactivityis addressed. Using ZnO nanoparticles, degradation of methylene blue occurred with rate constant of about 4.6x10-2 min-1 which was found to increase by 20% for 12.8% Ti in Ti:ZnO photocatalyst.For other Ti dopant concentrations the degradation rate constant decreased attributing to lower crystallite size with higher grain boundaries leading to charge carrier recombination and suppressed formation of reactive oxygen species.By addition of varying concentration of iso-propyl alcohol, the suppressed degradation process revealed the role of hydroxyl radicals in this low power UV light assisted photocatalysis. This was further supported with controlled experiments through generation of photoluminescence in terephthalic acid induced by the hydroxyl radicals. Ti:ZnO nanoparticles also showed significant anti-bacterial activity towards the gram positive (Staphylococcus aureus, Streptococcus mutans) andgram negative (Pseudomonas aeruginosa, Klebsella pneumonia) organisms. In addition to that, these nanoparticles also showed remarkable activity against fungi Candida albicans and Aspergillus flavus due to their greater surface area leading to generation of hydrogen peroxide. This study reveals importance of crystallite size in dye degradation process and anti-bacterial activity. The grown Ti:ZnO nanoparticles using a simple and scalable synthesis route are highly efficient photocatalyst material and anti-microbial agent for application of waste water treatment in industrial effluents and bacterial killing.

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Growth of undoped ZnO thin films by spray pyrolysis: effect of precursor concentration

Cited by 10 publications

References 34 publications

The Effect of Co and Cu Co-Doping Zno Thin Films on Structural and Optical Properties

The Effect of Co and Cu Co-Doping Zno Thin Films on Structural and Optical Properties

Improved humidity sensing performances of boron doped ZnO nanostructured thin films depending on boron concentration

Ti doped ZnO nanoparticles for photocatalytic hydroxyl radical generation under UV light for improved dye degradation and antimicrobial activity

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