Catalytic and SERS activities of WO<sub>3</sub>-based nanowires: the effect of oxygen vacancies, silver nanoparticle doping, and the type of organic dye

Ustun, Oguzhan; Yilmaz, Aslı; Yılmaz, Mehmet

doi:10.1039/d2cp00034b

Cited by 12 publications

(3 citation statements)

References 67 publications

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“…It allowed for a fast decomposition of RhB, but the activation movement of the Janus micromotors needed UV light irradiation. Oguzhan Ustun reported only a partial degradation of MB and RhB over WO3 oxides and Ag NPs/WO3 even after two hours of irradiation [71]. The reported metal-NPs/oxide catalysts were used for one or two dye pollutants, while our composites (as a versatile catalyst) were shown to be efficient both for cationic and anionic azo dyes.…”

Section: Application To the Photodegradation Of Three Dyes (Rhb Mo An...mentioning

confidence: 76%

Plasmonic Photocatalysts Based on Au Nanoparticles and WO3 for Visible Light-Induced Photocatalytic Activity

Desseigne,

Chevallier,

Madigou

et al. 2023

Catalysts

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In this work, we report the application of Au/WO3 composite as a photocatalyst for the degradation of dyes under solar light irradiation. Au/WO3 nanocomposites were synthesized using an acid precipitation method followed by an impregnation/reduction at room temperature. Two composites were obtained by loading gold nanoparticles on two morphologies of nanostructured WO3, nanoplatelets (NP), and pseudospheres (PS). The elaboration parameters of the nanocomposites were optimized according to the gold mass percentage, the HAuCl4 precursor concentration, and the impregnation time. The structural, microstructural, and textural characterization were conducted using advanced techniques: XRD, SEM/TEM microscopies, and XPS and DRS spectroscopies. The optimal synthesis parameters are a 48 h impregnation of a five mass percentage of gold from a HAuCl4 precursor with a concentration of 10−3 mol·L−1. The obtained composites were formed with Au nanoparticles of 7 nm in size. The XRD analyses did not reveal any modification of the oxide supports structure after gold grafting, contrary to the sorption analyses, which evidenced a change in the state of the materials surface. XPS analysis revealed the reduction of W6+ ions into W5+, favoring the presence of oxygen vacancies. Furthermore, a localized surface plasmon resonance effect was observed in the composite at 540 nm. The photocatalysis results of several dye pollutants have shown a selective degradation efficiency depending on the charge of the polluting molecules, pH medium, and mass loading of the catalysts. At the native pH, the photocatalysis process is highly efficient on a cationic molecule, with a low adsorption capacity. Au/WO3 PS composite appears to be the most efficient, degrading almost the whole RhB and MB only in 60 min and 90 min, respectively, while, for the MO anionic dye, the degradation is more efficient in acidic medium (80%) than in basic medium (0%). Trap tests of the main active species were investigated and a photodecomposition mechanism is proposed.

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Section: Application To the Photodegradation Of Three Dyes (Rhb Mo An...mentioning

confidence: 76%

Plasmonic Photocatalysts Based on Au Nanoparticles and WO3 for Visible Light-Induced Photocatalytic Activity

Desseigne,

Chevallier,

Madigou

et al. 2023

Catalysts

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“…N sers represents the average number of molecules detected on the SERS substrate, and N bulk represents the average number of molecules are detected on the no-SERS substrate. 59 The working wavelength of the confocal Raman spectrometer (LabRAM) was 633 nm. However, this method poses problems for determining the N sers , and it is not possible to determine whether to count the number of all test molecules adsorbed on the substrate or only those adsorbed on the metal nanostructures.…”

Section: Resultsmentioning

confidence: 99%

“…Here, I sers represents the Raman signal intensity of the probe molecule on the SERS substrate, while I bulk represents the Raman signal intensity of the probe molecule on a blank substrate. N sers represents the average number of molecules detected on the SERS substrate, and N bulk represents the average number of molecules are detected on the no-SERS substrate . The working wavelength of the confocal Raman spectrometer (LabRAM) was 633 nm.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of High-Stability and -Sensitivity Perovskite Nanoparticles with a Core–Shell Structure for Surface-Enhanced Raman Scattering

Zhuang,

Wang,

Huang

et al. 2024

J. Phys. Chem. C

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High-stability and -sensitivity perovskite nanoparticles with a core−shell structure were fabricated by an in situ one-step growth annealing technique, followed by the deposition of an ultrathin alumina film on its surface using the magnetron sputtering method. X-ray diffraction, scanning electron microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy were used to characterize the structures and the morphologies of the samples. The as-modified CH 3 NH 3 PbBr 3 @Al 2 O 3 core−shell nanoparticles demonstrated excellent uniformity and reproducibility in surface-enhanced Raman scattering (SERS) measurements, achieving a detection limit for methylene blue down to 10 −9 mol/L with an enhancement factor of up to 4.09 × 10 5 . The diffraction peaks of the (100) and (300) crystal planes were enhanced, while the intensities of the ( 210) and ( 220) planes were suppressed. The CH 3 NH 3 PbBr 3 @Al 2 O 3 core−shell substrate maintains its Raman detection stability over 30 days, broadening the application of SERS technology for high-sensitivity molecular detection on various substrate surfaces. Furthermore, finite-difference time-domain simulations showed high consistency with the experimental results. Our study provides a solid foundation for the practical application of perovskite-based SERS probes, especially in the fields of chemical, biological, material, and surface sciences. The applications span environmental monitoring, medical diagnostics, food safety, and forensic science.

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Novel core–shell structure composite NiCo2O4–Vo@ZIF with amorphous ZIF shell and oxygen-vacancy-rich core for asymmetric supercapacitors

Guo,

Lin,

Wang

et al. 2024

Electrochimica Acta

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Catalytic and SERS activities of WO₃-based nanowires: the effect of oxygen vacancies, silver nanoparticle doping, and the type of organic dye

Abstract: Oxygen vacancies in tungsten trioxide (WO3) nanostructures (WO3−x) dominate the major characteristics of the material and determine their activity in various applications including photocatalysis and surface-enhanced Raman spectroscopy (SERS).

Cited by 12 publications

References 67 publications

Plasmonic Photocatalysts Based on Au Nanoparticles and WO3 for Visible Light-Induced Photocatalytic Activity

Plasmonic Photocatalysts Based on Au Nanoparticles and WO3 for Visible Light-Induced Photocatalytic Activity

Fabrication of High-Stability and -Sensitivity Perovskite Nanoparticles with a Core–Shell Structure for Surface-Enhanced Raman Scattering

Novel core–shell structure composite NiCo2O4–Vo@ZIF with amorphous ZIF shell and oxygen-vacancy-rich core for asymmetric supercapacitors

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Catalytic and SERS activities of WO3-based nanowires: the effect of oxygen vacancies, silver nanoparticle doping, and the type of organic dye

Abstract: Oxygen vacancies in tungsten trioxide (WO3) nanostructures (WO3−x) dominate the major characteristics of the material and determine their activity in various applications including photocatalysis and surface-enhanced Raman spectroscopy (SERS).

Cited by 12 publications

References 67 publications

Plasmonic Photocatalysts Based on Au Nanoparticles and WO3 for Visible Light-Induced Photocatalytic Activity

Plasmonic Photocatalysts Based on Au Nanoparticles and WO3 for Visible Light-Induced Photocatalytic Activity

Fabrication of High-Stability and -Sensitivity Perovskite Nanoparticles with a Core–Shell Structure for Surface-Enhanced Raman Scattering

Novel core–shell structure composite NiCo2O4–Vo@ZIF with amorphous ZIF shell and oxygen-vacancy-rich core for asymmetric supercapacitors

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Catalytic and SERS activities of WO₃-based nanowires: the effect of oxygen vacancies, silver nanoparticle doping, and the type of organic dye