Photoluminescence study of trap-state defect on TiO<sub>2</sub>thin films at different substrate temperature via RF magnetron sputtering

Abdullah, Shahrir; Sahdan, Mohd Zainizan; Nayan, Nafarizal; Saim, Hashim; Bakri, Anis Suhaili; Rohaida, C H; Adriyanto, Feri; Sari, Yessie Widya

doi:10.1088/1742-6596/995/1/012067

Cited by 46 publications

(35 citation statements)

References 31 publications

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“…The citrus fruit is rich in flavonoid carotenoids, which result in the lemon fruit’s coloring and which offers natural healthy products for consumers. Strong-colored pigments originate from the permitted π–π * transition towards a visible region 24 . As soon as the excitation laser frequency is applied in coherence with the electronic shift in carotenoid molecules, a Raman spectrum 23 , 24 resonance is established.…”

Section: Resultsmentioning

confidence: 99%

“…Strong-colored pigments originate from the permitted π–π * transition towards a visible region 24 . As soon as the excitation laser frequency is applied in coherence with the electronic shift in carotenoid molecules, a Raman spectrum 23 , 24 resonance is established. Thus, the Raman spectral band intensity is enhanced, contrary to normal Raman scattering.…”

Section: Resultsmentioning

confidence: 99%

“…These active interstitial sites are considered to ease the migration of the Ag +1 ion from the top to to bottom electrode. The peaks related to the trapped electrons are those with a wavelength range of 590–700 nm that lie about 0.70–1.60 eV to the red band 24 . If we consider the hole-trap mechanism, then the mobile electrons that are in a radiative course transition can recombine with the trapped hole in a deep and shallow bulk level, which is found below the range of the conduction band.…”

Section: Resultsmentioning

confidence: 99%

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Low-cost green recyclable biomaterial for energy-dependent electrical switching and intact biofilm with antibacterial properties

Shamim

Arshad

Ahmed

et al. 2020

Sci Rep

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A highly cost-effective recycled biomaterial extracted from lime peel has been made biocompatible and has been coated on a commercial fluorine-doped tin oxide (FTO) substrate of glass using the spin coating method. Structural, morphologic, electronic, and antibacterial measurements were thoroughly characterized as a green biomaterial thin film using X-rays (XRD), PL, FTIR, Raman, SEM, HRTEM, AFM, I–V, and antibacterial diffusion techniques. The comprehensive analysis of structures of recyclable waste in the form of lime peel extract (LPE) as thin films showed the crystalline cellulose structure that corresponds to the lattice fringe (0.342 nm) exposed by HRTEM. The K +1 interstitial active sites or vacancies in LPE/FTO thin films are confirmed by the PL spectra that show important evidence about conduction mechanisms, and hence facilitates Ag +1 ion migration from the top to the bottom electrode. The AFM investigations revealed the minor surface roughness (169.61 nm) of the LPE/FTO film, which controls the current leakage that is associated with surface defects. The designed memory cell (Ag/LPE/FTO) exhibits stable, reproducible electrical switching under low operational voltage and is equipped with excellent retention over 5 × 10 3 s. Furthermore, owing to presence of flavonoids and their superior antioxidant nature, lime peel extract powder shows tremendous antimicrobial activity against gram-positive and Gram-negative bacterial strains.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Low-cost green recyclable biomaterial for energy-dependent electrical switching and intact biofilm with antibacterial properties

Shamim

Arshad

Ahmed

et al. 2020

Sci Rep

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“…The metal vacancies in TiO 2 generate trap states near the valence band to broaden the band and increase the hole mobility [36]. Abdullah et al [34] confirmed that charge carriers accumulate in the trap states and proceed to radiative recombination. In the one-element semiconductor of a diamond, which consists of sp 3 -hybridization, the surface has a high electric dipole moment when it is terminated with hydrogen, which leads to an upward shift of the surface band edge.…”

Section: Surface States At the Solid-liquid Interface For Charge Tranmentioning

confidence: 99%

“…For example, in TiO 2 , a well-known photocatalyst, the oxygen vacancy states generate interstitial Ti 3+ or Ti 3+ states on the surface [14,32,33]. These chemical species induce shallow trap states below the conduction band [34,35]. The metal vacancies in TiO 2 generate trap states near the valence band to broaden the band and increase the hole mobility [36].…”

Section: Surface States At the Solid-liquid Interface For Charge Tranmentioning

confidence: 99%

Understanding Surface Modulation to Improve the Photo/Electrocatalysts for Water Oxidation/Reduction

Cho

Lee

2020

Molecules

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Water oxidation and reduction reactions play vital roles in highly efficient hydrogen production conducted by an electrolyzer, in which the enhanced efficiency of the system is apparently accompanied by the development of active electrocatalysts. Solar energy, a sustainable and clean energy source, can supply the kinetic energy to increase the rates of catalytic reactions. In this regard, understanding of the underlying fundamental mechanisms of the photo/electrochemical process is critical for future development. Combining light-absorbing materials with catalysts has become essential to maximizing the efficiency of hydrogen production. To fabricate an efficient absorber-catalysts system, it is imperative to fully understand the vital role of surface/interface modulation for enhanced charge transfer/separation and catalytic activity for a specific reaction. The electronic and chemical structures at the interface are directly correlated to charge carrier movements and subsequent chemical adsorption and reaction of the reactants. Therefore, rational surface modulation can indeed enhance the catalytic efficiency by preventing charge recombination and prompting transfer, increasing the reactant concentration, and ultimately boosting the catalytic reaction. Herein, the authors review recent progress on the surface modification of nanomaterials as photo/electrochemical catalysts for water reduction and oxidation, considering two successive photogenerated charge transfer/separation and catalytic chemical reactions. It is expected that this review paper will be helpful for the future development of photo/electrocatalysts.

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Unraveling the Role of CuO in Cu_xO/TiO₂ Photocatalyst for the Direct Propylene Epoxidation With O₂ in a Fluidized Bed Reactor

Morante,

Tammaro,

Monzillo

et al. 2024

ChemSusChem

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Propylene epoxidation in mild conditions with molecular O2 is a highly desirable reaction that represents a significant challenge in the field of heterogeneous catalysis. In this work, CuxO/TiO2 composites with different CuO loadings were used to promote the photocatalytic epoxidation of propylene with molecular oxygen under UV‐A irradiation in a fluidized bed system. Different characterization techniques were employed to assess the influence of CuO content on the physical‐chemical properties of the CuxO/TiO2 composites. The best combination in terms of propylene conversion and selectivity towards propylene oxide (18.1% and 72%, respectively) was obtained with CuxO/TiO2 at 1.1 wt % CuO, as shown by photocatalytic tests. The high propylene oxide selectivity is due to the ability of CuO in the CuxO/TiO2 composite to transform molecular O2 into hydrogen peroxide that in turn is able to directly oxidize propylene to propylene oxide. By using a UV‐A light intensity of 297.2 mW cm‐2, the propylene conversion and the epoxide yield were 31.5 and 22.2%, respectively, significantly higher than that reported in the literature. Moreover, the energy consumption of the reaction system was significantly lower than that of literature photocatalytic systems dealing with selective propylene epoxidation.

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Photoluminescence study of trap-state defect on TiO₂thin films at different substrate temperature via RF magnetron sputtering

Cited by 46 publications

References 31 publications

Low-cost green recyclable biomaterial for energy-dependent electrical switching and intact biofilm with antibacterial properties

Low-cost green recyclable biomaterial for energy-dependent electrical switching and intact biofilm with antibacterial properties

Understanding Surface Modulation to Improve the Photo/Electrocatalysts for Water Oxidation/Reduction

Unraveling the Role of CuO in Cu_xO/TiO₂ Photocatalyst for the Direct Propylene Epoxidation With O₂ in a Fluidized Bed Reactor

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Photoluminescence study of trap-state defect on TiO2thin films at different substrate temperature via RF magnetron sputtering

Cited by 46 publications

References 31 publications

Low-cost green recyclable biomaterial for energy-dependent electrical switching and intact biofilm with antibacterial properties

Low-cost green recyclable biomaterial for energy-dependent electrical switching and intact biofilm with antibacterial properties

Understanding Surface Modulation to Improve the Photo/Electrocatalysts for Water Oxidation/Reduction

Unraveling the Role of CuO in CuxO/TiO2 Photocatalyst for the Direct Propylene Epoxidation With O2 in a Fluidized Bed Reactor

Contact Info

Product

Resources

About

Photoluminescence study of trap-state defect on TiO₂thin films at different substrate temperature via RF magnetron sputtering

Unraveling the Role of CuO in Cu_xO/TiO₂ Photocatalyst for the Direct Propylene Epoxidation With O₂ in a Fluidized Bed Reactor