Optical investigation of shell thickness in light scattering SiO2 particle with TiO2 nanoshells and its application in dye sensitized solar cells

Falahatdoost, Samira; Ara, M.H. Majles; Shaban, Zeinab; Ghazyani, Nahid

doi:10.1016/j.optmat.2015.06.053

Cited by 17 publications

(5 citation statements)

References 26 publications

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“…The isotherms of Ti/Si = 1 : 2 exhibited the similar shape of type IV with H2 hysteresis loops and indicated the presence of mesopores. However, the isotherms of Ti/Si = 1 : 5 and Ti/Si = 1 : 8 showed the same isotherm shape of SiO 2 particles with low adsorbed volume and type I shape without any obvious hysteresis loop, which was attributed to the less mesoporous titania coated on the CSTNs [34].…”

Section: Resultsmentioning

confidence: 87%

The Effect of Molar Ratios of Ti/Si on Core-Shell SiO₂@TiO₂ Nanoparticles for Photocatalytic Applications

Xue-ping

Wan

2020

Journal of Nanomaterials

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After the core-shell SiO2@TiO2 nanoparticles (CSTNs) were synthesized by hydrothermal method, we investigated the influence of different molar ratios of Ti/Si on morphology, structure, and photocatalytic activity of the CSTNs. It was found that the CSTNs showed different size and surface morphology as the Ti/Si molar ratio changed. Besides, the TiO2 and the CSTN had the anatase phase after hydrothermal process and calcination at 450°C for 2 h. The N2 adsorption-desorption isotherms demonstrated the CSTNs with the molar ratio of Ti/Si increased from 1 : 1 to 8 : 1 can be categorized as type IV with hysteresis loop of type H2 and showed to be mesoporous materials. In addition, the CSTNs with the Ti/Si molar ratio of 5 : 1 had the highest surface area of 176.79 m2/g. Surface charges showed the isoelectric point (IEP) of the CSTNs ranged between silica (IEP at pH 3.10) and titania (IEP at pH 5.29). Since the molar ratio of Ti/Si increased from 1 : 1 to 8 : 1 by degradating both colorless organic pollutant of phenol and colored substances of methylene blue (MB) under UV irradiation, the photocatalytic activity of CSTNs exhibited higher photodegradation efficiency compared with TiO2. What is more, the experimental results also showed the CSTNs with Ti/Si molar ratio of 5 : 1 had the highest photocatalytic activity and showed higher photocatalytic efficiency compared with other TiO2-SiO2 composites reported for photodegradation of phenol and MB.

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Section: Resultsmentioning

confidence: 87%

The Effect of Molar Ratios of Ti/Si on Core-Shell SiO₂@TiO₂ Nanoparticles for Photocatalytic Applications

Xue-ping

Wan

2020

Journal of Nanomaterials

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“…It is noticeable that relative transmission increased in core-shell nanoparticles and also increased with two cycle coating. According to Mie's theory, scattering is caused by difference in refractive indexes between scattering agents and surrounding media [56,57]. The refractive indexes of SiO 2 and YAG:Ce are about 1.46 and 1.82, respectively.…”

Section: A)mentioning

confidence: 99%

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

et al. 2020

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This paper aims to investigate the synthesis, structure, and optical properties of SiO2@YAG:Ce core–shell optical nanoparticles for solid state lighting applications. YAG:Ce phosphor is a key part in white light emitting diodes (LEDs), with its main functionality being the generation of yellow light. Generated yellow light from phosphor will be combined with blue light, emitted from chip, resulting in the generation of white light. Generated light in LEDs will often be scattered by SiO2 nanoparticles. SiO2 nanoparticles are often distributed within the optical window, aiming for a more homogeneous light output. The main idea in this research is to combine these functionalities in one core–shell particle, with its core being SiO2 and its shell being phosphor. In this study core–shell nanoparticles with different Ce3+ concentrations were synthesized by a sol–gel method. Synthesized nanoparticles were characterized by X-ray diffraction (XRD), small angle X-ray scattering (SAXS) analysis, high resolution transmission electron macroscopy (HRTEM), Fourier transform infrared (FTIR), and photoluminescence spectroscopy. Luminescence characteristics of SiO2@YAG:Ce core–shell particles were compared with that of SiO2/YAG:Ce mixture composite, which is now used in commercial LEDs. Obtained results showed that core–shell nanoparticles have comparatively much better optical properties, compared to SiO2/YAG:Ce mixture composite and can therefore be potentially used in LEDs.

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“…[18] With continuous investigation, other methods for developing photoanodes have been discovered, such as the modification of photoanodes using photonic crystals (PCs) as scattering layers. [19][20][21] This method is used to improve the light absorption capacity of photoanodes by interacting with incident light in a specific wavelength range. Large spherical particles have generally been used in the application of scattering layers for photoanode modification, but the scattering layers composed of large spherical particles have a low specific surface area and do not improve the efficiency of DSSC very much.…”

Section: Introductionmentioning

confidence: 99%

Application of Carbon Nanosphere Templates for Preparation of Inverse Opal Photonic Crystals in Dye‐Sensitized Solar Cells

Niu

Shao

Xie

et al. 2023

Physica Status Solidi (a)

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Carbon nanospheres are successfully synthesized with a particle size of about 140 nm using a two‐step hydrothermal method and used the carbon nanospheres as the deposition template material on the surface of P25(TiO2) by means of vertical deposition method. The antiopaline TiO2 photonic crystal (PC) structure is further prepared via immersed carbon nanospheres in TiO2 precursor solution, and the antiopal PC is used as the scattering layer of the photoanode of dye‐sensitized solar cell (DSSCs). As a comparison, the antiopal PC reflective layer is also prepared on the photoanode of DSSCs using polystyrene nanospheres as the template material. The photoanodes with those PC scattering layers prepared with different template materials are fabricated into complete DSSCs. The final photoelectric conversion efficiency of the DSSCs prepared with carbon nanospheres as the template material reaches 7.02%, which is comparable to the cells prepared with polystyrene nanospheres as the template material. The efficiency of the cell with the scattering layer is increased by about 16% compared with that of the normal DSSC based on P25.

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Optical investigation of shell thickness in light scattering SiO2 particle with TiO2 nanoshells and its application in dye sensitized solar cells

Cited by 17 publications

References 26 publications

The Effect of Molar Ratios of Ti/Si on Core-Shell SiO₂@TiO₂ Nanoparticles for Photocatalytic Applications

The Effect of Molar Ratios of Ti/Si on Core-Shell SiO₂@TiO₂ Nanoparticles for Photocatalytic Applications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Application of Carbon Nanosphere Templates for Preparation of Inverse Opal Photonic Crystals in Dye‐Sensitized Solar Cells

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Optical investigation of shell thickness in light scattering SiO2 particle with TiO2 nanoshells and its application in dye sensitized solar cells

Cited by 17 publications

References 26 publications

The Effect of Molar Ratios of Ti/Si on Core-Shell SiO2@TiO2 Nanoparticles for Photocatalytic Applications

The Effect of Molar Ratios of Ti/Si on Core-Shell SiO2@TiO2 Nanoparticles for Photocatalytic Applications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Application of Carbon Nanosphere Templates for Preparation of Inverse Opal Photonic Crystals in Dye‐Sensitized Solar Cells

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The Effect of Molar Ratios of Ti/Si on Core-Shell SiO₂@TiO₂ Nanoparticles for Photocatalytic Applications

The Effect of Molar Ratios of Ti/Si on Core-Shell SiO₂@TiO₂ Nanoparticles for Photocatalytic Applications