Vertical Convective Coassembly of Refractory YSZ Inverse Opals from Crystalline Nanoparticles

Kubrin, Roman; Rosário, Jefferson J. do; Lee, Hooi Sing; Mohanty, Sweety; Subrahmanyam, Raman; Смирнова, Ирина; Petrov, Alexey M.; Petrov, Alexander Yu.; Eich, Manfred; Schneider, Gerold A.

doi:10.1021/am404180y

Cited by 22 publications

(22 citation statements)

References 53 publications

(80 reference statements)

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“…It is very likely that these defects are responsible for the crack formation typically observed for heat-treated 3DOM structures. 26,34 Our results indicate that sintering of structures with higher number of particles in the struts and nodes offer a high probability for rearrangement processes, which can lead to the healing of initial packing defects.…”

Section: Discussionmentioning

confidence: 78%

Sintering Simulation of Periodic Macro Porous Alumina

et al. 2015

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Three-dimensionally ordered macroporous (3DOM) ceramic materials are considered for a variety of applications. One of its many subclasses, inverse opals, is constituted by the ordered arrangement of the pores, resulting in the functionality of a photonic crystal and leading to strong reflection of incident electromagnetic radiation. Exposing these porous structures to high temperatures, however, can lead to sintering of the desired structure and loss of functionality. Therefore, discrete element method (DEM) simulations are performed on inverse opal structures with random homogenous distributed alumina particles forming the struts and nodes. Grain-boundary diffusion as well as surface diffusion are modeled via respective parameters of a contact model applied in MUSEN-DEM. Furthermore, the void to particle size ratio is varied to simulate fine and coarse grained 3DOM ceramics. Results indicate that nodes densify at higher rates and to a larger extent when compared to struts. An increase in the void to particle size ratio results in similar trends but with lower densification rates. This behavior is observed regardless whether surface or grain-boundary diffusion is considered as the dominant transport mechanism, with the latter giving higher densification rates. Variations in particle coordination due to the initial random packing favor local desintering, thereby causing the formation of defects/crack nuclei.

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Section: Discussionmentioning

confidence: 78%

Sintering Simulation of Periodic Macro Porous Alumina

et al. 2015

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“…reflectance reduction after heat treatment, several reasons have to be considered: first, the inverse opal structure shrinks during heat treatment and macroscopic cracks originated during the self-assembly [7,8] process (not visible in the small field-of-view in the scanning electron microscopy (SEM)) can open up during sintering [48] ; Second, the texture associated with the new formed grains in the coating (inset in Figure 8d) shall increase the portion of the incident light being scattered; Third, analogous to the results presented by Tétreault et al, [49] the mullite coating can be interpreted as a defect into the alumina inverse opal structure, depending on the thickness and refractive index; Fourth, mullite itself presents a lower refraction index than alumina. [10] In view of that, only coated opals are being compared, hence the comparison of opals composed by different materials could mislead to wrong conclusions.…”

Section: Wwwadvmatinterfacesdementioning

confidence: 99%

Low‐Temperature Mullite Formation in Ternary Oxide Coatings Deposited by ALD for High‐Temperature Applications

Furlan

Krekeler

Ritter

et al. 2017

Adv Materials Inter

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coatings on geometrically complex substrates, [2][3][4] such as anodic aluminum oxide membranes, aerogels, photonic crystals, and nanorods, with a film thickness control on the Å-scale. Additionally, by combining two or more binary ALD processes in a super cycle ALD process, multicomponent materials can be achieved, such as nanolaminates, doped thin films, and ternary or quaternary oxides. [5] The ability of compositional control of thin films at an atomic level provides the possibility for development of tailor-made atomically mixed systems, pointing to novel materials functionalities.Direct and inverse opals are examples of photonic crystals, which can be manufactured by colloidal self-assembly [6,7] and ALD. [8,9] Its high ordered porosity of interconnects is attractive for a variety of technological applications, such as porous membranes, catalysts, solid oxide fuel cells, and photonics applications. [10][11][12] The 3D periodic arrangement of pores provides a photonic bandgap to these artificial materials, which prohibits the transmission and hence leads to a reflection of electromagnetic radiation in spectral range which is determined by the materials' properties. Specifically, the radiation wavelength, which will be reflected, is influenced by the material microstructure assemble, mono-or multistacked, and also the macropore size. [8,9,[13][14][15] This selective behavior in transmission and reflection might pave the way to effective solar thermo photovoltaic energy conversion devices [16,17] and also next-generation thermal barrier coatings.However, retention of the 3D structure for high-temperature applications remains a significant challenge. [10,18] As the length scales in these porous materials are decreased, as higher is the surface area and specific activity. When exposed to high temperatures, the material's structure may suffer from detrimental morphological changes, such as extensive grain growth, distortion, and eventually destruction of the total periodically organized structure. [9,10] Therefore, this material needs to not only interact with electromagnetic radiation but also have structural stability and keep its function up to high temperatures (usually higher than 1000 °C). The latter fact could be addressed by coating the substrate material with a ceramic oxide that is stable at high temperatures, either by chemical vapor deposition (CVD) [19] or ALD [20] processes.Herein, mullite has been chosen: A ceramic material, which is well known for its stability at high-temperature environments, Atomic layer deposition (ALD) process presents thickness control in an Ång-strom scale due to its inherent surface self-limited reactions. In this work, an ALD super cycle approach, where a superposition of nanolaminates of SiO 2 and Al 2 O 3 is generated by cycling the precursors APTES-H 2 O-O 3 and TMA-H 2 O, is used to deposit thin films with varying ratio of Al 2 O 3 :SiO 2 into silicon wafers and into inverse photonic crystals. The resulting ternary oxide films deposited at low temperature (150 °C) ar...

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“…The incorporation of metal nanoparticles into inverse opals has recently attracted particular attention in the literature [34,103,153]. The high surface area and photonic properties of inverse opals coupled with the typical properties of metal nanoparticles greatly expand the possible applications of these materials as catalysts [35,154,155], sensors [30,34,156], photonic structures [66,157] and in surface-enhanced Raman spectroscopy (SERS) [65,158].…”

Section: Aunps With Inverse Opalsmentioning

confidence: 99%

Gold Nanoparticles in Photonic Crystals Applications: A Review

Venditti

2017

Materials

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This review concerns the recently emerged class of composite colloidal photonic crystals (PCs), in which gold nanoparticles (AuNPs) are included in the photonic structure. The use of composites allows achieving a strong modification of the optical properties of photonic crystals by involving the light scattering with electronic excitations of the gold component (surface plasmon resonance, SPR) realizing a combination of absorption bands with the diffraction resonances occurring in the body of the photonic crystals. Considering different preparations of composite plasmonic-photonic crystals, based on 3D-PCs in presence of AuNPs, different resonance phenomena determine the optical response of hybrid crystals leading to a broadly tunable functionality of these crystals. Several chemical methods for fabrication of opals and inverse opals are presented together with preparations of composites plasmonic-photonic crystals: the influence of SPR on the optical properties of PCs is also discussed. Main applications of this new class of composite materials are illustrated with the aim to offer the reader an overview of the recent advances in this field.

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Vertical Convective Coassembly of Refractory YSZ Inverse Opals from Crystalline Nanoparticles

Cited by 22 publications

References 53 publications

Sintering Simulation of Periodic Macro Porous Alumina

Sintering Simulation of Periodic Macro Porous Alumina

Low‐Temperature Mullite Formation in Ternary Oxide Coatings Deposited by ALD for High‐Temperature Applications

Gold Nanoparticles in Photonic Crystals Applications: A Review

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