Implementation of Ag/ SiO2 nanofilms for metamaterial engineering

Prepelita, Petronela; Garoi, F.; Dumitru, Marius; Crăciun, V.

doi:10.1016/j.rinp.2022.105387

Cited by 4 publications

(3 citation statements)

References 45 publications

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“…The sizes of the crystals determined from the intense peak at 38.02° (1 1 1 plane) for Ag@SiO 2 and Do-Ag@SiO 2 CS NPs are found to be 8.3 and 9.5 nm, respectively. Additionally, the interatomic spacing value was calculated as 0.23 nm, which was derived from the intense peak of the Ag@SiO 2 and Do-Ag@SiO 2 CS NPs, and it matches well with the previously reported data …”

Section: Resultsmentioning

confidence: 60%

“…Additionally, the interatomic spacing value was calculated as 0.23 nm, which was derived from the intense peak of the Ag@SiO 2 and Do-Ag@SiO 2 CS NPs, and it matches well with the previously reported data. 52 Ag@SiO 2 and Do-Ag@SiO 2 CS NPs and their constituent materials were observed by field emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HRTEM) analysis to investigate the surface morphological changes and structural features. The FESEM image of pristine Ag NPs (Figure 2a) displays a quasispherical shape with a relatively smooth surface and an aggregated particle size of around 160 to 180 nm.…”

Section: ■ Results and Discussionmentioning

confidence: 83%

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Collagen-Supported Amino-Functionalized Ag@SiO₂ Core–Shell Nanoparticles for Visible-Light-Driven Water Remediation

Subbiah

Thanikaivelan

2022

ACS Appl. Nano Mater.

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Environment-friendly, easily recoverable, cost-effective, visible-light-active, and biomass-derived photocatalysts for photocatalytic disinfection of wastewater are an indispensable priority to the growing scarcity of usable water resources. Herein, we synthesized a Ag@SiO2 core–shell (CS) nanosphere via chemical reduction and a modified Stöber method. Subsequently, a biodegradable nanocomposite was fabricated using CS nanospheres with dopamine (Do-Ag@SiO2) functionalization anchored with collagen (Coll-Do-Ag@SiO2), a renewable biomass sourced from biowaste, employing a sustainable and cost-effective method. The obtained Coll-Do-Ag@SiO2 nanocomposite displayed effective photocatalytic disinfection of tannery wastewater and Escherichia coli (E. coli), which was used as the representative microorganism with visible light irradiation. Complete photocatalytic disinfection was achieved within 15 and 20 min for E. coli and tannery wastewater, respectively, which is the fastest inactivation time reported so far. The process of annihilation of the cell wall and cell membrane was confirmed by field emission scanning electron microscopy images of bacteria acquired at different time intervals. The live/dead cell assay ascertains the loss of integrity of bacterial cell walls as the cause of death. Electron paramagnetic resonance spectroscopy and radical trapping studies reveal hydroxyl radicals (•OH), hyperoxide radicals (•O2 –), and photogenerated electrons (e–) as the main species in E. coli inactivation. The reactive species led to plasma membrane rupture, which was found to be the key factor in the destruction mechanism. The enhanced antibacterial performance of the Coll-Do-Ag@SiO2 nanocomposite was predominantly due to the improved photocatalysis due to stronger light absorption, a low band gap energy of 2.95 eV, and a low charge-transfer resistance (R ct) of 640 Ω. Considering the easy recovery and excellent photocatalytic performance, the biomass-derived visible-light-active Coll-Do-Ag@SiO2 nanocomposite is an attractive and inexpensive photocatalyst for water remediation applications.

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Section: Resultsmentioning

confidence: 60%

Section: ■ Results and Discussionmentioning

confidence: 83%

Collagen-Supported Amino-Functionalized Ag@SiO₂ Core–Shell Nanoparticles for Visible-Light-Driven Water Remediation

Subbiah

Thanikaivelan

2022

ACS Appl. Nano Mater.

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“…It is reached, for example, by using the porous dielectric layer [16]. The authors of [17,18] have demonstrated the possibility to create metamaterials and enhance the sensitivity of SPR sensors due to applying the additional layer of silicon oxide (SiO 2 ). Shown in the works [1,19] is the promising character of applying an additional ZnO layer to enhance the sensitivity of gas SPR sensors.…”

Section: Introductionmentioning

confidence: 99%

Highly- sensitive to n-hexane vapors SPR sensor with an additional ZnO layer

Dorozinsky,

Kachur,

Dorozinska

et al. 2024

Preprint

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Offered, developed and experimentally tested in this work is the multilayer element highly sensitive to n-hexane vapors. This element is aimed to be used in the surface plasmon resonance (SPR) sensor with a plasmon-carrying gold layer covered with a sorption layer of zinc oxide (ZnO). The bandgap width inherent to these layers prepared using sol-gel technology reached Eg = 3.198...3.3 eV, in dependency on the oxide layer thickness. The bulk porosity of the layers was 15.5 up to 69.5 vol.%, also in dependency on the oxide layer thickness. The surface micro-roughness of ZnO layer with the optimal thickness close to 20 nm was increased by 4.4 times as compared with that of pure gold surface without ZnO layer. Sensory properties of sensitive elements were studied relatively to vapors of the following solvents in air: isopropanol, acetone and n-hexane. The highest sensitivity of the sensor was inherent to n-hexane. The response of SPR sensor, when using the additional ZnO layer of the optimal thickness 20 nm, was 4-fold increased from 247 up to 952 ang.sec., if comparing with the sensor without ZnO layer. The selectivity to hexane as compared with that for isopropanol and acetone in the case of the of ZnO-modified sensor was enhanced practically 2-fold from 3.1 up to 5.6 times. The obtained results can be applied to monitor n-hexane vapors in air.

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Highly-sensitive to n-hexane vapors SPR sensor with an additional ZnO layer

Dorozinsky,

Kachur,

Dorozinska

et al. 2024

Opt Quant Electron

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Implementation of Ag/ SiO2 nanofilms for metamaterial engineering

Cited by 4 publications

References 45 publications

Collagen-Supported Amino-Functionalized Ag@SiO₂ Core–Shell Nanoparticles for Visible-Light-Driven Water Remediation

Collagen-Supported Amino-Functionalized Ag@SiO₂ Core–Shell Nanoparticles for Visible-Light-Driven Water Remediation

Highly- sensitive to n-hexane vapors SPR sensor with an additional ZnO layer

Highly-sensitive to n-hexane vapors SPR sensor with an additional ZnO layer

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Implementation of Ag/ SiO2 nanofilms for metamaterial engineering

Cited by 4 publications

References 45 publications

Collagen-Supported Amino-Functionalized Ag@SiO2 Core–Shell Nanoparticles for Visible-Light-Driven Water Remediation

Collagen-Supported Amino-Functionalized Ag@SiO2 Core–Shell Nanoparticles for Visible-Light-Driven Water Remediation

Highly- sensitive to n-hexane vapors SPR sensor with an additional ZnO layer

Highly-sensitive to n-hexane vapors SPR sensor with an additional ZnO layer

Contact Info

Product

Resources

About

Collagen-Supported Amino-Functionalized Ag@SiO₂ Core–Shell Nanoparticles for Visible-Light-Driven Water Remediation

Collagen-Supported Amino-Functionalized Ag@SiO₂ Core–Shell Nanoparticles for Visible-Light-Driven Water Remediation