Influence of Ho 3+ ions on structural and optical properties of zinc borotellurite glass system

Usman, A.; Halimah, M.K.; Latif, Amirah Abdul; Muhammad, F.D.; Abubakar, Abdussamad

doi:10.1016/j.jnoncrysol.2017.12.040

Cited by 66 publications

(19 citation statements)

References 15 publications

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“…By using absorbance mode of same UV‐visible spectrophotometer, the absorbance of all the samples with respect to wavelength (200‐800 nm) was estimated. The band gap of all the samples were calculated by following Davis and Mott's relation (see Equation )

α E = B {(E - E_{normalg})}^{n / 2}

Section: Methodsmentioning

confidence: 99%

“…

α E = B {(E - E_{normalg})}^{n / 2}

where α is a coefficient of absorbance, E is the energy of incident light beam, E g is the band gap of the material, and n is the constant which depends upon type of transition (direct or indirect). Only indirect band gap calculation was done, because glasses are mainly reported for indirect band gap semiconductor and indirect semiconductors are required for the photocatalytic processes due to less tendency of electron‐hole pair recombination, which makes them more likely to participate in the surface reactions . For the indirect band gap calculation, n was taken as two …”

Section: Methodsmentioning

confidence: 99%

“…Only indirect band gap calculation was done, because glasses are mainly reported for indirect band gap semiconductor and indirect semiconductors are required for the photocatalytic processes due to less tendency of electron‐hole pair recombination, which makes them more likely to participate in the surface reactions . For the indirect band gap calculation, n was taken as two …”

Section: Methodsmentioning

confidence: 99%

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Antibacterial and photocatalytic active transparent TiO₂ crystallized CaO–BaO–B₂O₃–Al₂O₃–TiO₂–ZnO glass nanocomposites

et al. 2018

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Transparent TiO2 crystallized 5CaO–10BaO–65B2O3–Al2O3–20TiO2–10ZnO (CBBATZ) glass nanocomposites were fabricated using melt‐quenching technique followed by specific heat treatments. As‐quenched glass samples were provided three different heat treatments at 630°C for 3, 5, and 10 hours in order to obtain different amounts of TiO2 nanocrystals in the glass. The presence of rutile phase of TiO2 nanocrystals in glass was confirmed by X‐ray diffraction. The glass nanocomposite heat treated for 10 hours showed a hydrophobic nature with contact angle of 90.90°. Contact angle decreased from 90.90 to 22.20°, when irradiated under ultraviolet (UV) radiation for 45 minutes. This photoinduced hydrophilicity showed a photocatalytic and self‐cleaning properties of glass nanocomposite. During photocatalytic ink test, the maximum change in color of Resurin (Rz) ink and 60% degradation in absorbance of ink within 150 minutes under UV radiation were found for glass nanocomposite heat treated at 10 hours. Also, 78% degradation in absorbance of methylene blue dye (pollutant) within 180 minutes under UV irradiation was found for glass naocomposite heat‐treated at 10 hours. Antibacterial performance of transparent glass nanocomposite against Escherichia coli was evaluated as well. More than 95% of the bacterial cells were degraded with glass nanocomposite heat‐treated at 10 hours. CBBATZ glass nanocomposite found to impart the antibacterial effect through generation of reactive oxygen species (ROS) in aqueous medium. ROS species which was confirmed in the bacterial cell through intracellular ROS generation kit. During evaluation of mechanical properties using nanoindentation technique, the values of hardness and reduced modulus increased by ~26% and 10%, respectively, for glass nanocomposite heat‐treated at 10 hours as compared to as‐quenched glass.

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α E = B {(E - E_{normalg})}^{n / 2}

Section: Methodsmentioning

confidence: 99%

“…

α E = B {(E - E_{normalg})}^{n / 2}

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Antibacterial and photocatalytic active transparent TiO₂ crystallized CaO–BaO–B₂O₃–Al₂O₃–TiO₂–ZnO glass nanocomposites

et al. 2018

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“…XRD is a non-destructive testing method that has been employed to detect the presence of any crystalline phase in a material via the diffraction and the scattering of X-ray as it pass through the material [6]. The XRD pattern from the powder form glass samples that were documented at 2θ angles in the range of 20˚ to 80˚ under room temperature are illustrated in Figure 1.…”

Section: X-ray Diffraction (Xrd) Spectroscopymentioning

confidence: 99%

Structural and Optical Properties of Zinc Borotellurite Glass Co-Doped with Lanthanum and Silver Oxide

Fudzi$Glass¹,

Lab²,

Serdang³

et al. 2018

MSCE

Self Cite

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A series of zinc borotellurite glass co-doped with lanthanum and silver oxide with the chemical formula of [{[(TeO 2 )0.7(B 2 O 3 ) 0.3 ] 0.7 (ZnO) 0.3 } 0.96 (La 2 O 3 ) 0.04 ] 1−x (Ag 2 O) x where the molar fraction of silver oxide, x = 0.02, 0.04, 0.06, 0.08 and 0.10 had been successfully prepared via the conventional melt-quenching technique. The structural properties of the glasses were unveiled through X-ray Diffraction (XRD) and Fourier Transform Infra-Red (FTIR) spectroscopy while optical properties of the glasses were investigated with Ultra Violet Visible (UV-Vis) spectrophotoscopy. The short range periodic atomic arrangement in the glass matrix that implies the amorphous nature of the glass was confirmed with the presence of a broad hump in the XRD pattern. On the other hand, the three absorption bands observable in the FTIR spectra had proven the existence of BO 4 , BO 3 as well as TeO 4 units in the glass network. The absorbance values retrieved from UV-Vis spectroscopy were utilized to calculate the indirect energy band gap and Urbach energy values of the fabricated glass. By employing the equations proposed by Mott and Davis, the obtained indirect energy band gap have values ranging from 2.16 to 4.16 eV.The decreasing trend in indirect energy band gap and increasing Urbach energy values were related to the increasing number of nonbridging oxygen (NBO) in the glass that is created from the breaking of Te-O-Te or B-O-B bonds after lanthanum as well as silver oxide are incorporated into the zinc borotellurite glass network.

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“…In the last few decades, tellurite glasses have been studied mainly because of their excellent properties in terms of high refractive index, wide transmission window, a high solubility of rare-earth ions, broad range absorption in the infrared region, low phonon energy, low melting point and stability against crystallisation [1,2]. Making use of these properties, various compositions of tellurite glasses have been extensively researched for broad applications such as optical amplifiers, optical fibre, laser, sensors, ultrafast optical switches, and gamma radiation shielding [3,4].…”

Section: Introductionmentioning

confidence: 99%

Effect of B₂O₃ addition on thermal and optical properties of TeO₂–ZnO–Bi₂O₃–TiO₂ glasses

Marzuki

Ega

Saraswati

2022

Mater. Res. Express

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New tellurite glasses with composition (in mol%): 60TeO2–(30-x)ZnO–5Bi2O3–5TiO2-xB2O3 (where x = 0, 2.5, 5.0, 7.5 and 10.0) were fabricated using conventional melt quenching method. Compositional dependence of the glasses on their density, thermal, refractive index and optical properties were investigated. X-Ray Diffraction analysis was carried out to confirm the nature of the thus formed glasses. Density, refractive index, and absorption spectra were measured at room temperature from which other glass characteristics such as polaron radius, oxygen packing density, field strength, B3+ interatomic distance, band gap energy, and Urbach tail were determined. Thermal characterisation to determine the change in glass transition temperature, glass crystallisation, melting point, and glass stability was carried out using Differential Scanning Calorimetry. A discussion was made in order to understand the results in terms of the ratio of bridging oxygen to non-bridging oxygen ions (BO/NBO). It was found that the addition of B2O3 results in increasing oxygen packing density, glass transition temperature, BO/NBO ratio and band gap energy, while decreasing density, refractive index, field strength, glass stability and Urbach tail energy. With increasing B2O3 concentration density changed from 5.879 to 5.646 g/cm3, refractive index 1.875 to 1.741, working temperature range (ΔT = 660C) and phonon energy within the range of 736 – 740 cm-1.

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Influence of Ho 3+ ions on structural and optical properties of zinc borotellurite glass system

Cited by 66 publications

References 15 publications

Antibacterial and photocatalytic active transparent TiO₂ crystallized CaO–BaO–B₂O₃–Al₂O₃–TiO₂–ZnO glass nanocomposites

Antibacterial and photocatalytic active transparent TiO₂ crystallized CaO–BaO–B₂O₃–Al₂O₃–TiO₂–ZnO glass nanocomposites

Structural and Optical Properties of Zinc Borotellurite Glass Co-Doped with Lanthanum and Silver Oxide

Effect of B₂O₃ addition on thermal and optical properties of TeO₂–ZnO–Bi₂O₃–TiO₂ glasses

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Influence of Ho 3+ ions on structural and optical properties of zinc borotellurite glass system

Cited by 66 publications

References 15 publications

Antibacterial and photocatalytic active transparent TiO2 crystallized CaO–BaO–B2O3–Al2O3–TiO2–ZnO glass nanocomposites

Antibacterial and photocatalytic active transparent TiO2 crystallized CaO–BaO–B2O3–Al2O3–TiO2–ZnO glass nanocomposites

Structural and Optical Properties of Zinc Borotellurite Glass Co-Doped with Lanthanum and Silver Oxide

Effect of B2O3 addition on thermal and optical properties of TeO2–ZnO–Bi2O3–TiO2 glasses

Contact Info

Product

Resources

About

Antibacterial and photocatalytic active transparent TiO₂ crystallized CaO–BaO–B₂O₃–Al₂O₃–TiO₂–ZnO glass nanocomposites

Antibacterial and photocatalytic active transparent TiO₂ crystallized CaO–BaO–B₂O₃–Al₂O₃–TiO₂–ZnO glass nanocomposites

Effect of B₂O₃ addition on thermal and optical properties of TeO₂–ZnO–Bi₂O₃–TiO₂ glasses