Direct Synthesis of Alumina Nanowires on Ceramic Substrates Using Sn Catalysts

Direct integration of nanostructures into macroscopic substrates is very important for their practical applications. In this work, we report a simple method that can be introduced for the Sn‐catalyzed growth of alumina nanowires on ceramic substrates such as porous disk, monolith, and foam. Our stud...

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Published inJournal of the American Ceramic Society Vol. 98; no. 12; pp. 4036 - 4043
Main Authors Jeong, Namjo, Hong, Sung-kuk, Kim, Chansoo, Kim, Kahee
Format Journal Article
LanguageEnglish
Published Columbus Blackwell Publishing Ltd 01.12.2015
Wiley Subscription Services, Inc
Subjects
Alpha rays
Alumina
Aluminum oxide
Amalgamation
Catalysis
Catalysts
Cathodoluminescence
Ceramics
Chemical synthesis
Crystal structure
Foams
Hair
Nanostructure
Nanowires
Polycrystals
Substrates
Tin
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Summary:Direct integration of nanostructures into macroscopic substrates is very important for their practical applications. In this work, we report a simple method that can be introduced for the Sn‐catalyzed growth of alumina nanowires on ceramic substrates such as porous disk, monolith, and foam. Our study focuses on the role of the Sn catalysts in the formation mechanisms governing nanowire growth. Using the proposed approach, hair‐ or grass‐like tufts of 20 nm diameter nanowires grow on the surface of the ~3 μm diameter Sn particles, in a tip growth mechanism. The nanowires of α‐phased polycrystalline structure grow and are packed via a complex process involving batch‐by‐batch, branching, and amalgamation growth. The detailed observations reveal that the Sn catalyst is key to tailoring the growth patterns of the nanowires. In addition, cathodoluminescence studies highlight the potential optical applications of the alumina nanowires.
Bibliography:Fig. S1. Low- and high-magnification SEM images of (a) Bar-like Al2O3 nanowire assemblies and (b) spindle-like Al2O3 nanowire assemblies. Fig. S2. EDX spectra measured at (a) top and (b) lower parts of a Sn particle, and (c) a nanowire. Fig. S3. XRD graph of raw substrate, SnO2/substrate, and Sn/Al2O3 nanowires/substrate. The raw substrate is Al2O3 disk with a little aluminosilicate. Fig. S4. HRTEM image showing the deposition of Sn nanoparticles on the surface of Al2O3 nanowires. White arrows indicate the deposited Sn nanoparticles. Fig. S5. TEM and HRTEM images of Al2O3 nanochains synthesized without SnO2 nanoparticles. An inset is the corresponding FFT image showing that the nanochains have γ-phased Al2O3 structure, a cubic structure with {440}, {400}, {311}, and {220} reflections (PDF#97-006-6559). Fig. S6. A schematic image describing that (a) branching growth and (b) amalgamating growth mechanisms of Al2O3 nanowires is controlled by an intelligent behavior of Sn catalyst. Fig. S7. XPS survey spectra of raw substrate, SnO2/substrate, and Sn/α-Al2O3 nanowires/substrate. The raw substrate is Al2O3 disk with a little aluminosilicate. Fig. S8. SEM images showing the effect of synthesis time on the growth of Al2O3 nanowire assemblies: (a) 1, (b) 5, and (c) 60 min. Yellow arrows indicate the Al2O3 nanowires grown from surface of Sn particles. Fig. S9. (a) Low- and (b) high-magnification SEM images of products synthesized using only Al powder as a starting source material. Fig. S10. The Gibbs free energies of formation for SnO2, SiO2, and Al2O3. Fig. S11. SEM images of Al2O3 nanowires synthesized on the surfaces of Al2O3 (a)-(c) monolith and (d)-(f) foam.
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ArticleID:JACE13784
Korea Institute of Energy Research - No. B5-2481
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.13784