Growth and characterization of ZnO thin films at low temperatures: from room temperature to − 120 °C

Morales, Carlos; Leinen, D.; Campo, Adolfo del; Ares, J.R.; Sánchez, Carlos; Flege, Jan Ingo; Gutiérrez, Alejandro; Prieto, Pilar; Soriano, L.

doi:10.1016/j.jallcom.2021.161056

Cited by 12 publications

(4 citation statements)

References 44 publications

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“…The average resistivity values obtained for the ZnO thick films Z-20, Z-40, and Z-60 were 2.46 × 10 5 ohm-m, 7.93 × 10 4 ohm-m, 7.88 × 10 4 ohm-m, respectively. The resistivity values found for the ZnO thick films were within the range of values reported in the literature for ZnO [55,56]. The decrease in resistivity among the Z-20, Z-40, and Z-60 thick films was related to the milling time used in the fabrication of ZnO, as the Z-60 thick films with 60 min of milling had the lowest resistivity value.…”

Section: R Peer Review 12 Of 22supporting

confidence: 81%

Preparation of ZnO Thick Films Activated with UV-LED for Efficient H2S Gas Sensing

Martínez-Pacheco,

Cervantes-López,

López-Guemez

et al. 2024

Coatings

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In this work, ZnO thick films were synthesized via two simple and easy methods, mechanochemical synthesis and screen-printing deposition. The ZnO powders were obtained through milling at low temperature with milling times of 20, 40, and 60 min. The ZnO thick films were fabricated by depositing 10 cycles of ZnO inks onto glass substrates. The characterization of ZnO thick films revealed a thickness ranging from 4.9 to 5.4 µm with a surface roughness between 85 and 88 nm. The structural analysis confirmed a hexagonal wurtzite crystalline structure of ZnO, both in powders and in thick films, with a preferred orientation on the (002) and (101) planes. Nanostructures with sizes ranging from 36 to 46 nm were observed, exhibiting irregular agglomerated shapes, with an energy band found between 2.77 and 3.02 eV. A static experimental set up was fabricated for gas sensing tests with continuous UV-LED illumination. The ZnO thick films, well adhered to the glass substrate, demonstrated high sensitivity and selectivity to H2S gas under continuous UV-LED illumination at low operating temperatures ranging from 35 to 80 °C. The sensitivity was directly proportional, ranging from 3.93% to 22.40%, when detecting H2S gas concentrations from 25 to 600 ppm.

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Section: R Peer Review 12 Of 22supporting

confidence: 81%

Preparation of ZnO Thick Films Activated with UV-LED for Efficient H2S Gas Sensing

Martínez-Pacheco,

Cervantes-López,

López-Guemez

et al. 2024

Coatings

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“…Zinc oxide (ZnO) has been shown to be a remarkable material with interesting physical and chemical properties [1]. ZnO is a wideband semiconductor, possessing a direct optical band gap (E g ) of 3.37 eV at room temperature, a large exciton binding energy (60 meV), and good transparency in the visible spectral range [2].…”

Section: Introductionmentioning

confidence: 99%

Sol–Gel Synthesis of ZnO:Li Thin Films: Impact of Annealing on Structural and Optical Properties

Ivanova,

Harizanova,

Koutzarova

et al. 2023

Crystals

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A sol–gel deposition approach was applied for obtaining nanostructured Li-doped ZnO thin films. ZnO:Li films were successfully spin-coated on quartz and silicon substrates. The evolution of their structural, vibrational, and optical properties with annealing temperature (300–600 °C) was studied by X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), UV-VIS spectroscopic, and field emission scanning electron microscopic (FESEM) characterization techniques. It was found that lithium doping maintains the wurtzite arrangement of ZnO, with increasing crystallite sizes when increasing the annealing temperature. Analysis of the FTIR spectra revealed a broad main absorption band (around 404 cm−1) for Li-doped films, implying the inclusion of Li into the ZnO lattice. The ZnO:Li films were transparent, with slightly decreased transmittance after the use of higher annealing temperatures. The porous network of undoped ZnO films was transformed to a denser, grained, packed structure, induced by lithium doping.

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“…To fulfill the rising demands for flexible, scalable, and low-temperature device production, a simple solution immersion method through low temperature chemical reaction can be appropriately adopted. However, it has been reported that the growth of ZnO nanostructures at low temperatures (<100C) produces issues with the stability, dispersion and crystalline structures control of ZnO nanoparticles in aqueous solution bath due to the low kinetics or total suppression of the chemical reactions [38,39]. This could be a significant problem for the output performance of nanogenerators.…”

Section: Introductionmentioning

confidence: 99%

Effects of Thermal Annealing on The Morphology and Structural Characteristics of Zinc Oxide Nanopowders for Triboelectric Nanogenerator Applications

Kamaruzaman

Mamat

Ariffin

et al. 2022

ARFMTS

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The influence of thermal annealing on the surface morphologies and structural characteristics of zinc oxide (ZnO) nanopowders synthesized via the solution immersion method for triboelectric nanogenerator applications is reported in this paper. The ZnO nanopowders were thermally treated at different temperatures of annealing in the ranges between 300°C to 700°C for 1 hour, and their surface morphologies and structural properties were studied using field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) analysis. The ZnO nanopowders have a polycrystalline, hexagonal wurtzite structure and are composed of ZnO nanoparticles and hexagonal nanorods. ZnO based tribolectric nanogenerators were fabricated with these nanopowders and their performance was assessed in terms of the output voltage. It is found that the ZnO based triboelectric nanogenerator fabricated with ZnO nanopowders annealed at 500°C has superior performance compared with the other nanogenerators, with an average output voltage of 1.95 V. This corresponds to a fourfold increase in output voltage relative to that of the ZnO based triboelectric nanogenerator fabricated with as-deposited ZnO nanopowders. In conclusion, thermal annealing significantly influences particle size and crystallinity of ZnO nanopowders, which in turn, influences the output voltage of ZnO based triboelectric nanogenerators.

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Growth and characterization of ZnO thin films at low temperatures: from room temperature to − 120 °C

Cited by 12 publications

References 44 publications

Preparation of ZnO Thick Films Activated with UV-LED for Efficient H2S Gas Sensing

Preparation of ZnO Thick Films Activated with UV-LED for Efficient H2S Gas Sensing

Sol–Gel Synthesis of ZnO:Li Thin Films: Impact of Annealing on Structural and Optical Properties

Effects of Thermal Annealing on The Morphology and Structural Characteristics of Zinc Oxide Nanopowders for Triboelectric Nanogenerator Applications

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