Structural, morphological, and optical properties of Bi2O3 thin films grown by reactive sputtering

Popa, Petru Lunca; Sønderby, Søren Kaae; Kerdsongpanya, Sit; Lu, Jun; Arwin, Hans; Eklund, Per

doi:10.1016/j.tsf.2017.01.013

Cited by 20 publications

(3 citation statements)

References 42 publications

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“…The XRD patterns in Figure 1 C was also confirmed by the FESEM image (Figure 4). No additional peaks related to the presence of Ho or any other impurities were detected, and these results indicated that α-Bi 2 O 3 is thermodynamically stable between 400 and 500 • C [38].…”

Section: Resultsmentioning

confidence: 75%

“…The growth of the tetragonal Bi2O3 phase at 600 °C was also confirmed by the FESEM image (Figure 4). No additional peaks related to the presence of Ho or any other impurities were detected, and these results indicated that α-Bi2O3 is thermodynamically stable between 400 and 500 °C [38]. The XRD results indicated that the synthesis of α-Bi2O3 and mixed α, β phases can be achieved by controlling the substrate temperature in vacuo.…”

Section: Resultsmentioning

confidence: 79%

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Influences of Substrate Temperatures and Oxygen Partial Pressures on the Crystal Structure, Morphology and Luminescence Properties of Pulsed Laser Deposited Bi2O3:Ho3+ Thin Films

et al. 2020

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Monoclinic Bi2O3:Ho3+ powder was synthesized using a co-precipitation method, followed by the deposition of Bi2O3:Ho3+ thin films on Si (100) substrates at various substrate temperatures (room temperature–600 °C) and oxygen partial pressures (5–200 mT) using pulsed-laser deposition. X-ray diffraction analysis showed a single α-Bi2O3 phase at temperatures of 400 and 500 °C, while a mixed α- and β-Bi2O3 phase was obtained at 600 °C. The films deposited at the different oxygen partial pressures showed an α-Bi2O3 and non-stoichiometric phase. The influences of different substrate temperatures and oxygen partial pressures on the morphology and the thickness of the films were analyzed using a scanning electron microscope. The root mean square roughnesses of the films were determined by using an atomic force microscope. The surface components, oxidation states and oxygen vacancies in all the deposited thin films were identified by X-ray photoelectron spectroscopy. The optical band gap of the Bi2O3:Ho3+ thin films was calculated using diffused reflectance spectra and was found to vary between 2.89 and 2.18 eV for the deposited films at the different temperatures, whereas the different oxygen partial pressures showed a band gap variation between 2.97 and 2.47 eV. Photoluminescence revealed that Ho3+ was the emitting centre in the isolated thin films with the 5F4/5S2 → 5I8 transition as the most intense emission in the green region.

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Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 79%

Influences of Substrate Temperatures and Oxygen Partial Pressures on the Crystal Structure, Morphology and Luminescence Properties of Pulsed Laser Deposited Bi2O3:Ho3+ Thin Films

et al. 2020

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“…18-244). It is worth mentioning that there are six polymorphic forms of Bi 2 O 3 reported by researchers, which include monoclinic (α-Bi 2 O 3 ), tetragonal (β-Bi 2 O 3 ), cubic bodycentered (γ-Bi 2 O 3 ), cubic face-centered (δ-Bi 2 O 3 ), orthorhombic (ε-Bi 2 O 3 ), and triclinic (ω-Bi 2 O 3 ) phases [39]. Table 1 displays the average crystallites sizes D that were estimated using Scherrer's formula from the obtained XRD patterns at different Bi 2 O 3 loadings.…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

Study of Prepared Lead-Free Polymer Nanocomposites for X- and Gamma-ray Shielding in Healthcare Applications

Alsaab

Zeghib

2023

Polymers

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Polymer composites were synthesized via melt mixing for radiation shielding in the healthcare sector. A polymethyl-methacrylate (PMMA) matrix was filled with Bi2O3 nanoparticles at 10%, 20%, 30%, and 40% weight percentages. The characterization of nanocomposites included their morphological, structural, and thermal properties, achieved using SEM, XRD, and TGA, respectively. The shielding properties for all synthesized samples including pristine PMMA were measured with gamma spectrometry using a NaI (Tl) scintillator detector spanning a wide range of energies and using different radioisotopes, namely Am-241 (59.6 keV), Co-57 (122.2 keV), Ra-226 (242.0), Ba-133 (80.99 and 356.02 keV), Cs-137 (661.6 keV), and Co-60 (1173.2 and 1332.5 keV). A substantial increase in the mass attenuation coefficients was obtained at low and medium energies as the filler weight percentage increased, with minor variations at higher gamma energies (1173 and 1332 keV). The mass attenuation coefficient decreased with increasing energy except under 122 keV gamma rays due to the K-absorption edge of bismuth (90.5 keV). At 40% loading of Bi2O3, the mass attenuation coefficient for the cesium 137Cs gamma line at 662 keV reached the corresponding value for the toxic heavy element lead. The synthesized PMMA-Bi2O3 nanocomposites proved to be highly effective, lead-free, safe, and lightweight shielding materials for X- and gamma rays within a wide energy range (<59 keV to 1332 keV), making them of interest for healthcare applications.

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Functional Oxides for Photoneuromorphic Engineering: Toward a Solar Brain

Pérez‐Tomás

2019

Adv Materials Inter

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New device concepts and new computing principles are needed to balance our ever-growing appetite for data and information with the realization of the goals of increased energy efficiency, reduction in CO 2 emissions and the circular economy. Neuromorphic or synaptic electronics is an emerging field of research aiming to overcome the current computer's Von-Neumann bottleneck by building artificial neuronal systems to mimic the extremely energy efficient biological synapses. The introduction of photovoltaic and/or photonic aspects into these neuromorphic architectures will produce self-powered adaptive electronics but may also open up new possibilities in artificial neuroscience, artificial neural communications, sensing and machine learning which would enable, in turn, a new era for computational systems owing to the possibility of attaining high bandwidths with much reduced power consumption. This perspective is focused on recent progress in the implementation of functional oxide thinfilms into photovoltaic and neuromorphic applications towards the envisioned goal of selfpowered photovoltaic neuromorphic systems or a solar brain.

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Structural, morphological, and optical properties of Bi2O3 thin films grown by reactive sputtering

Abstract: Structural, morphological, and optical properties of Bi 2 O 3 thin films grown by reactive sputtering

Cited by 20 publications

References 42 publications

Influences of Substrate Temperatures and Oxygen Partial Pressures on the Crystal Structure, Morphology and Luminescence Properties of Pulsed Laser Deposited Bi2O3:Ho3+ Thin Films

Influences of Substrate Temperatures and Oxygen Partial Pressures on the Crystal Structure, Morphology and Luminescence Properties of Pulsed Laser Deposited Bi2O3:Ho3+ Thin Films

Study of Prepared Lead-Free Polymer Nanocomposites for X- and Gamma-ray Shielding in Healthcare Applications

Functional Oxides for Photoneuromorphic Engineering: Toward a Solar Brain

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