Visible Mie Scattering in Nonabsorbing Hollow Sphere Powders

Retsch, Markus; Schmelzeisen, Marcus; Butt, Hans‐Jürgen; Thomas, Edwin L.

doi:10.1021/nl2002445

Cited by 101 publications

(109 citation statements)

References 17 publications

(34 reference statements)

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“…Therefore, the scattering efficiency in different wavelength regions of the incident light spectrum is largely dependent on the diameter of TiO 2 spheres. Only when the scattering resonant peak, which indicates the strongly efficient scattering, 25 is coupled into the light-absorption region of TiO 2 , the scattering and absorption for the TiO 2 is effective, followed with the highest light utilization efficiency. As shown in Scheme 1b, the scattering phenomenon occurs on the TiO 2 spheres with diameters of smaller (330 nm), comparable (380 nm), and larger (450 nm) than the light absorption edge of TiO 2 (about 387 nm) is depicted.…”

Section: ■ Introductionmentioning

confidence: 99%

Size-Dependent Mie’s Scattering Effect on TiO₂ Spheres for the Superior Photoactivity of H₂ Evolution

Chen

Ouyang

et al. 2012

J. Phys. Chem. C

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A novel strategy of coupling Mie's scattering effect into the lightabsorption region of TiO 2 was developed to enhance the photocatalytic performance of H 2 evolution over TiO 2 spheres. The TiO 2 spheres with different diameters (330− 750 nm) were controllably fabricated via adopting different sized polymer poly(methyl methacrylate) (PMMA) templates. The UV−visible absorption and reflectance spectra were employed for studying the absorption and scattering properties of these TiO 2 spheres. It was found that the scattering resonant peaks that indicate the strongly efficient scattering in different wavelength regions were largely dependent on the sizes of the TiO 2 spheres. The scattering resonant peaks have been detected around 366, 400, and 440 nm for the TiO 2 spheres with diameters of 380, 450, and 600 nm, respectively. Moreover, the photocatalytic efficiency of the H 2 evolution was found to be dependent on the size of the TiO 2 spheres. Among them, the TiO 2 spheres with a diameter of 380 nm exhibited the highest photocatalytic activity (313 μmol/(h·m 2 )), about 5 times and 3 times of that of 330 and 450 nm sized TiO 2 spheres, respectively. The highest activity observed on 380 nm sized TiO 2 may be attributed to its optimized diameter, which can result in a highly efficient scattering effect in the light-absorption region of TiO 2 (λ < 387 nm).

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Section: ■ Introductionmentioning

confidence: 99%

Size-Dependent Mie’s Scattering Effect on TiO₂ Spheres for the Superior Photoactivity of H₂ Evolution

Chen

Ouyang

et al. 2012

J. Phys. Chem. C

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“…The scattering performance can be significantly altered if hollow silica spheres are prepared. Figure 3(b) shows photographs and backscattering spectra of hollow silica particles with different overall diameter but rather constant shell thicknesses [81]. Mie scattering in the visible wavelength range is observed.…”

Section: Organicmentioning

confidence: 99%

“…The scattering cross section increases with increasing particle size, whereby the largest spheres show typical Mie type II scattering oscillations at shorter wavelengths. (b) Single particle spectra of hollow silica nanoparticles obtained by confocal dark field spectroscopy [81]. The insets show SEM images of hollow silica spheres and the visible Mie scattering of vials with different hollow nanoparticles.…”

Section: Organicmentioning

confidence: 99%

Colloidal self-assembly concepts for light management in photovoltaics

et al. 2015

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Colloidal particles show interaction with electromagnetic radiation at optical frequencies. At the same time clever colloid design and functionalization concepts allow for versatile particle assembly providing monolayers of macroscopic dimensions. This has led to a significant interest in assembled colloidal structures for light harvesting in photovoltaic devices. In particular thin-film solar cells suffer from weak absorption of incoming photons. Consequently light management using assembled colloidal structures becomes vital for enhancing the efficiency of a given device. This review aims at giving an overview of recent developments in colloid synthesis, functionalization and assembly with a focus on light management structures in photovoltaics. We distinguish between optical effects related to the single particle properties as well as collective optical effects, which originate from the assembled structures.Colloidal templating approaches open yet another dimension for controlling the interaction with light. We focus in this respect on structured electrodes that have received much attention due to their dual functionality as light harvesting systems and conductive electrodes and highlight the impact of interparticle spacing for templating.

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“…For instance, the gold or silicon hollow spheres have been demonstrated to own some special mechanical-or structure-dependent Mie scattering properties and can emit fascinating 'music'-coherent acoustic vibrations or reveal a color nano-world in our bare eyes [2][3][4]. The large internal void has been used as carriers for the controlled encapsulation release of various substances such as drugs, biomolecules, dyes, inks, and so on [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Templated fabrication of hollow nanospheres with ‘windows’ of accurate size and tunable number

Xie¹,

Hou²,

Su³

et al. 2016

Nano Online

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The 'windows' or 'doors' on the surface of a closed hollow structure can enable the exchange of material and information between the interior and exterior of one hollow sphere or between two hollow spheres, and this information or material exchange can also be controlled through altering the window' size. Thus, it is very interesting and important to achieve the fabrication and adjustment of the 'windows' or 'doors' on the surface of a closed hollow structure. In this paper, we propose a new method based on the temple-assisted deposition method to achieve the fabrication of hollow spheres with windows of accurate size and number. Through precisely controlling of deposition parameters (i.e., deposition angle and number), hollow spheres with windows of total size from 0% to 50% and number from 1 to 6 have been successfully achieved. A geometrical model has been developed for the morphology simulation and size calculation of the windows, and the simulation results meet well with the experiment. This model will greatly improve the convenience and efficiency of this temple-assisted deposition method. In addition, these hollow spheres with desired windows also can be dispersed into liquid or arranged regularly on any desired substrate. These advantages will maximize their applications in many fields, such as drug transport and nano-research container.

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Visible Mie Scattering in Nonabsorbing Hollow Sphere Powders

Cited by 101 publications

References 17 publications

Size-Dependent Mie’s Scattering Effect on TiO₂ Spheres for the Superior Photoactivity of H₂ Evolution

Size-Dependent Mie’s Scattering Effect on TiO₂ Spheres for the Superior Photoactivity of H₂ Evolution

Colloidal self-assembly concepts for light management in photovoltaics

Templated fabrication of hollow nanospheres with ‘windows’ of accurate size and tunable number

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Visible Mie Scattering in Nonabsorbing Hollow Sphere Powders

Cited by 101 publications

References 17 publications

Size-Dependent Mie’s Scattering Effect on TiO2 Spheres for the Superior Photoactivity of H2 Evolution

Size-Dependent Mie’s Scattering Effect on TiO2 Spheres for the Superior Photoactivity of H2 Evolution

Colloidal self-assembly concepts for light management in photovoltaics

Templated fabrication of hollow nanospheres with ‘windows’ of accurate size and tunable number

Contact Info

Product

Resources

About

Size-Dependent Mie’s Scattering Effect on TiO₂ Spheres for the Superior Photoactivity of H₂ Evolution

Size-Dependent Mie’s Scattering Effect on TiO₂ Spheres for the Superior Photoactivity of H₂ Evolution