A Single‐Crystalline Mesoporous Quartz Superlattice

Matsuno, Takamichi; Kuroda, Yoshiyuki; Kitahara, Masaki; Shimojima, Atsushi; Wada, Hiroaki; Kuroda, Kazuyuki

doi:10.1002/anie.201600675

Cited by 12 publications

(18 citation statements)

References 36 publications

(21 reference statements)

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“…13 Other studies show that, at the nanoscale, the connement of alkaline or alkaline earth melting agents is essential for achieving a controlled crystallization of a-quartz. In particular, we prepared superlattices of polycrystalline aquartz nanospheres by impregnating preformed 3D stackings of mesoporous silica spheres with aqueous solutions of alkaline earth cations followed by thermal treatments above 800 C. However, using a Li 3+ solution we observed a straightforward crystallization of a-quartz and lithium silicate with a loss of the superstructure morphology, at temperatures as low as 650 C. In contrast, Matsuno et al 11 obtained a-quartz nanosphere superlattices with improved crystallinity at 870 C aer conning Li + between silica spheres and a reinforcing carbon coating. Ndayishimiye et al 12 impregnated microporous SiO 2 nanoparticles with NaOH solutions and studied their hydrothermal sintering, nding an amorphous product below a concentration threshold (1 M) while dense polycrystalline aquartz resulted from impregnations with more concentrated solutions.…”

Section: Introductionmentioning

confidence: 83%

“…5 Lately, fundamental and application-driven interest in nanoscale SiO 2 provided new insights towards understanding and controlling silica devitrication in microporous, mesoporous and ultrathin silica. [6][7][8][9][10][11][12][13][14][15] Most of these studies highlight the essential role of alkaline, 11 alkaline earth [8][9][10]15 and transition metal dopants 7 in obtaining the desired crystallization. For instance, the formation of iron silicate seeds underpins the epitaxial growth of thermally evaporated ultrathin silica on Ru (0001).…”

Section: Introductionmentioning

confidence: 99%

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Tailoring the crystal growth of quartz on silicon for patterning epitaxial piezoelectric films

et al. 2019

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Epitaxial films of piezoelectric a-quartz could enable the fabrication of sensors with unprecedented sensitivity for prospective applications in electronics, biology and medicine. However, the prerequisites are harnessing the crystallization of epitaxial a-quartz and tailoring suitable film microstructures for nanostructuration. Here, we bring new insights into the crystallization of epitaxial a-quartz films on silicon (100) from the devitrification of porous silica and the control of the film microstructures: we show that by increasing the quantity of devitrifying agent (Sr) it is possible to switch from an a-quartz microstructure consisting of a porous flat film to one dominated by larger, fully dense a-quartz crystals. We also found that the film thickness, relative humidity and the nature of the surfactant play an important role in the control of the microstructure and homogeneity of the films. Via a multi-layer deposition method, we have extended the maximum thickness of the a-quartz films from a few hundreds of nm to the mm range. Moreover, we found a convenient method to combine this multilayer approach with soft lithography to pattern silica films while preserving epitaxial crystallization. This improved control over crystallization and the possibility of preparing patterned films of epitaxial a-quartz on Si substrates pave the path to future developments in applications based on electromechanics, optics and optomechanics.

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Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Tailoring the crystal growth of quartz on silicon for patterning epitaxial piezoelectric films

et al. 2019

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“…Great efforts have been devoted on the growth of porous single crystals, but only a few oxide semiconductors including TiO 2 , SnO 2 , and ZrO 2 singlecrystalline particles have been prepared using sacrificial templating approaches. [11][12][13] It should be noted that only porous metal nitride single crystals possess both structural and compositional coherences to accommodate the surface active metalnitrogen moieties. However, the growth of metallic porous metal nitride single crystals especially with enhanced functionalities at centimeter scale, such as active metal-nitrogen moieties with highly unsaturated nitrogen coordination for specific catalysis reactions, remains a great challenge.…”

Section: Metallic Porous Single Crystalsmentioning

confidence: 99%

Metallic Porous Iron Nitride and Tantalum Nitride Single Crystals with Enhanced Electrocatalysis Performance

Zhang

Lin

et al. 2018

Advanced Materials

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Previous studies show that the metalnitrogen moieties with unsaturated nitrogen coordination numbers possess higher catalytic activities and the reported smallest nitrogen coordination number is confirmed to be ≈2 for Co-N 2 and Fe-N 2 moieties using extended X-ray absorption fine structure spectra analysis. [4][5][6] These results indeed give an in-depth insight at the atomic level into structural dependence of catalytic activity of metal nitride nanoparticles by closely correlating the average structural information with catalytic performances. However, the active metalnitrogen moieties confined at the surface layer of materials that host catalysis reactions still remain unclear.Building metal-nitrogen moieties with unsaturated nitrogen coordination numbers to enhance material's catalytic activity remains a fundamental challenge. The state-of-the-art pyrolysis technique of specific precursors is commonly used to construct metal-nitrogen moieties. However, the simultaneous presence of multiple metal species in most composite catalysts makes it highly complex to understand the nature of metal-nitrogen moieties. [7][8][9][10] The short length scale of nanostructured catalysts makes it extremely challenging to quantify metal-nitrogen moiety structure and distributions and to correspondingly elucidate the electronic structure features and unusual activity. The metal-nitrogen moieties are indeed a kind of active clusters at atomic level, which are strictly confined at lattice in local structures in crystalline composites. The polycrystalline or amorphous states of composites make it highly uncertain to construct resolved metal-nitrogen moieties and to accordingly expose these active centers on material's surfaces to host catalysis reactions. Another consideration should be given to the resolved structural feature and chemical composition of moieties that tailor electronic structures to facilitate catalysis functionalities.Single crystals with porosity, combining the advantages of long-range structural coherence of bulk crystals and large surface areas of porous materials, could provide opportunities to host the metal-nitrogen moieties with unsaturated nitrogen coordination on surface. The long-range structural coherence in single crystals offers the possibility to stabilize the metalnitrogen moieties in lattice of local structures on crystalline surfaces especially on the condition that the surface moieties have similar chemical compositions to bulk crystals. Porous Altering a material's catalytic properties would require identifying structural features that deliver electrochemically active surfaces. Single-crystalline porous materials, combining the advantages of long-range ordering of bulk crystals and large surface areas of porous materials, would create sufficient active surfaces by stabilizing 2D active moieties confined in lattice and may provide an alternative way to create high-energy surfaces for electrocatalysis that are kinetically trapped. Here, a radical concept of building active metalnitrogen moieties ...

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“…The other approach, using a flux, is useful for preparing single crystalline mesoporous quartz films [5b] and polycrystalline hollow quartz nanoparticles, [5c] although control of the pore size and pore arrangement has yet to be achieved. We succeeded in preparing mesoporous quartz with remarkably large crystallites and controlled mesopore arrangements using a Li 2 O flux and a carbon template [5d] . The synthesis is based on the use of silica colloidal crystals (SCCs) composed of uniform nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Cristobalite Containing Ordered Interstitial Mesopores using Crystallization of Silica Colloidal Crystals

Matsuno

Nakaya

Kuroda

et al. 2020

Chemistry An Asian Journal

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Cristobalite with ordered interstitial dual‐sized mesopores was synthesized through the crystallization of silica colloidal crystals composed of monodispersed amorphous silica nanoparticles. An aqueous solution containing both a flux (Na2O) and a carbon precursor (an aqueous low‐molecular weight phenolic resin) was infiltrated into the interstices of silica colloidal crystals. The organic fraction in the nanocomposite was further polymerized and subsequently carbonized in an Ar flow at 750 °C to reinforce the colloidal crystal structure. The thermal treatment resulted in the crystallization of the colloidal crystals into cristobalite while retaining the porous structure. The cristobalite‐carbon nanocomposite was calcined in air to remove the carbon and create interstitial ordered mesopores in the cristobalite. The surfaces of crystalline mesoporous silica are quite different from those of various ordered mesoporous silica with amorphous frameworks; thus, the present findings will be useful for a precise understanding and control of the interfaces between the mesopores and silica networks.

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A Single‐Crystalline Mesoporous Quartz Superlattice

Cited by 12 publications

References 36 publications

Tailoring the crystal growth of quartz on silicon for patterning epitaxial piezoelectric films

Tailoring the crystal growth of quartz on silicon for patterning epitaxial piezoelectric films

Metallic Porous Iron Nitride and Tantalum Nitride Single Crystals with Enhanced Electrocatalysis Performance

Synthesis of Cristobalite Containing Ordered Interstitial Mesopores using Crystallization of Silica Colloidal Crystals

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