Photoconduction in silicon rich oxide films

Luna-López, J. A.; Aceves-Mijares, M.; Carrillo-López, J.; Morales–Sánchez, A.; Flores-Gracia, F.; Garcı́a-Salgado, G.

doi:10.1088/1742-6596/167/1/012017

Cited by 5 publications

(5 citation statements)

References 6 publications

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“… 56 The peaks marked by dashed lines “ a ” and “ b ” located at ∼573 and ∼611 cm –1 , respectively, can be assigned to the asymmetric stretching modes of ZnO 4 in the Zn 2 SiO 4 crystal, 57 , 58 while the peak at ∼1097 cm –1 (indicated by dashed line “ c ”) can be attributed to the Si–O–Si stretching mode. 59 − 61 Moreover, a peak at ∼567 cm –1 was previously reported as the characteristic absorption peak of the Zn–O stretching mode. 28 , 29 Looking at Figure 8 , it is therefore clear that the peak at ∼567 cm –1 up to 700 °C arises from the vibrational mode of ZnO 4 , 57 whereas it is drastically suppressed in the presence of crystalline Zn 2 SiO 4 57 , 58 from ZS-9A.…”

Section: Resultsmentioning

confidence: 91%

Tailoring Structural, Chemical, and Photocatalytic Properties of ZnO@β-SiC Composites: The Effect of Annealing Temperature and Environment

et al. 2023

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For achieving unified functionalities of rare-earth free materials, the development of innovative zinc oxide and β-silicon carbide (ZnO@β-SiC) composites by a solid-state reaction method is presented. The evolution of zinc silicate (Zn2SiO4) is evidenced by X-ray diffraction when annealed in air beyond 700 °C. Detailed X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy analyses reveal the involvement of silicon dioxide in forming Zn2SiO4. Transmission electron microscopy and the associated energy-dispersive X-ray spectroscopy elucidate the evolution of the zinc silicate phase at the ZnO/β-SiC interface, though it can be averted by vacuum annealing. These results manifest the importance of air in oxidizing SiC before a chemical reaction with ZnO from 700 °C. Finally, ZnO@β-SiC composites are found to be promising for methylene blue dye degradation under ultraviolet radiation, but the annealing above 700 °C is detrimental due to the evolution of a potential barrier in the presence of Zn2SiO4 at the ZnO/β-SiC interface.

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Section: Resultsmentioning

confidence: 91%

Tailoring Structural, Chemical, and Photocatalytic Properties of ZnO@β-SiC Composites: The Effect of Annealing Temperature and Environment

et al. 2023

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“…In particular, the peaks characteristic of the imidazolium ring at 1184, 1550, 33 and 1570 cm –1 34 can be assigned to the C–N, N–H, and C=N bonds, respectively. The peaks referring to chemical bonds with silicon are indicated at 1033, 35 915, 36 and 750–820 cm –1 , 37 which are referred to O–Si–O, Si–O, and Si–C bonds, respectively. The band indicating the presence of the aliphatic C=C is observed at 1650 cm –1 , 22 and the aliphatic C–H bonds are presented at 2840–3050 cm –1 .…”

Section: Results and Discussionmentioning

confidence: 99%

“…In particular, the peaks characteristic of the imidazolium ring at 1184, 1550, 33 and 1570 cm −134 can be assigned to the C−N, N−H, and C� N bonds, respectively. The peaks referring to chemical bonds with silicon are indicated at 1033, 35 915, 36 and 750−820 cm −1 , 37 The FTIR analysis of the functionalized SiO 2 with different silane concentrations showed three peaks (Figure 2C): 1033 cm −1 related to O−Si−O, 815, and 470 cm −1 related to Si−O. The zoomed-in image shown in Figure 2C is the spectra in the region from 400 to 1350 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Ionic Liquid-Based Silane for SiO₂ Nanoparticles: A Versatile Coupling Agent for Dental Resins

Garcia,

Souza,

Balhaddad

et al. 2024

ACS Appl. Mater. Interfaces

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The current longevity of dental resins intraorally is limited by susceptibility to acidic attacks from bacterial metabolic byproducts and vulnerability to enzymatic or hydrolytic degradation. Here, we demonstrate synthesizing an ionic liquid-based antibiofilm silane effective against Streptococcus mutans, a major caries pathogen. Furthermore, we incorporate this silane into dental resins, creating antibiofilm-and degradation-resistant materials applicable across resin types. FTIR, UV−vis, and NMR spectroscopy confirmed the synthesis of the expected ionic liquid-based silane. The characterization of SiO 2 after the silanization indicated the presence of the silane and how it interacted with the oxide. All groups achieved a degree of conversion similar to that found for commercial resin composites immediately and after two months of storage in water. The minimum of 2.5 wt % of silane led to lower softening in solvent than the control group (G CTRL ) (p < 0.05). While the flexural strength indicated a lower value from 1 wt % of silane compared to G CTRL (p < 0.05), the ultimate tensile strength did not indicate differences among groups (p > 0.05). There was no difference within groups between the immediate and long-term tests of flexural strength (p > 0.05) or ultimate tensile strength (p > 0.05). The addition of at least 5 wt % of silane reduced the viability of S. mutans compared to G CTRL (p < 0.05). The fluorescence microscopy analysis suggested that the higher the silane concentration, the higher the amount of bacteria with membrane defects. There was no difference among groups in the cytotoxicity test (p > 0.05). Therefore, the developed dental resins displayed biocompatibility, proper degree of conversion, improved resistance against softening in solvent, and stability after 6 months of storage in water. This material could be further developed to produce polymeric antimicrobial layers for different surfaces, supporting various potential avenues in developing novel biomaterials with enhanced therapeutic characteristics using ionic liquid-based materials.

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“…The PL spectrum consists generally of intense emission peaks in the near-infrared (NIR) and visible (VIS) regions. It was established that blue and green PLs are caused by various emitting centres in the silicon oxide, while the nature of the intense PL in orange-red region is still discussed [17][18][19].…”

Section: Some Techniques Of Production Of Sromentioning

confidence: 99%

Theoretical and Experimental Characterization of Silicon Nanoclusters Embedded in Silicon-Rich Oxide films

Torres¹,

laLuz²,

Martínez-Juárez³

2017

New Research on Silicon - Structure, Properties, Technology

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We present theoretical calculations using DFT method and the Global Reaction Model (GRM) for molecular structures and photoluminescence (PL) and Fourier Transform Infrared (FTIR) spectroscopy for silicon nanoclusters (Si-NCs) embedded in silicon rich oxide (SRO) films. Correlations between theoretical predictions and experimental results are made taking as reference experimental results obtained from measurements performed on SRO thin films obtained by the Hot Filament Chemical Vapor Deposition (HFCVD) technique. Our theoretical predictions are general since they do not depend on the particular technique used to obtain such films but rather the suggested SinOn structures. A good correlation exists for Eg values for films grown at 1300°C corresponding to Si 8 O 8 and Si 16 O 16 molecular structures suggested and for films grown at 1150°C with Si 9 O 9. Regards PL correlation, a film grown at 900°C gives a spectrum peaked at 440nm and 548nm while theoretical one shows peaks at 471nm and 549.8 nm for a structure Si 16 O 16. Such sample with a further annealing displays peaks at 405nm, 749nm and 820nm with theoretical predictions at 415nm using Si 6 O 6. As for FTIR, theoretical calculations predict vibrational mode frequencies of bonds Si-O and Si-H whose values are well located in the experimental frequency range corresponding to the structure Si 16 O 16 .

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Photoconduction in silicon rich oxide films

Cited by 5 publications

References 6 publications

Tailoring Structural, Chemical, and Photocatalytic Properties of ZnO@β-SiC Composites: The Effect of Annealing Temperature and Environment

Tailoring Structural, Chemical, and Photocatalytic Properties of ZnO@β-SiC Composites: The Effect of Annealing Temperature and Environment

Ionic Liquid-Based Silane for SiO₂ Nanoparticles: A Versatile Coupling Agent for Dental Resins

Theoretical and Experimental Characterization of Silicon Nanoclusters Embedded in Silicon-Rich Oxide films

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Photoconduction in silicon rich oxide films

Cited by 5 publications

References 6 publications

Tailoring Structural, Chemical, and Photocatalytic Properties of ZnO@β-SiC Composites: The Effect of Annealing Temperature and Environment

Tailoring Structural, Chemical, and Photocatalytic Properties of ZnO@β-SiC Composites: The Effect of Annealing Temperature and Environment

Ionic Liquid-Based Silane for SiO2 Nanoparticles: A Versatile Coupling Agent for Dental Resins

Theoretical and Experimental Characterization of Silicon Nanoclusters Embedded in Silicon-Rich Oxide films

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Product

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Ionic Liquid-Based Silane for SiO₂ Nanoparticles: A Versatile Coupling Agent for Dental Resins