High-surface-area corundum nanoparticles by resistive hotspot-induced phase transformation

Bing Deng, Paul A. Advincula, Duy Xuan Luong, Jingan Zhou, Boyu Zhang, Zhe Wang, Emily A. McHugh, Jinhang Chen, Robert A. Carter, Carter Kittrell, Jun Lou, Yuji Zhao, Boris I. Yakobson, Yufeng Zhao () and James M. Tour ()
Additional contact information
Bing Deng: Rice University
Paul A. Advincula: Rice University
Duy Xuan Luong: Rice University
Jingan Zhou: Rice University
Boyu Zhang: Rice University
Zhe Wang: Rice University
Emily A. McHugh: Rice University
Jinhang Chen: Rice University
Robert A. Carter: Rice University
Carter Kittrell: Rice University
Jun Lou: Rice University
Yuji Zhao: Rice University
Boris I. Yakobson: Rice University
Yufeng Zhao: Rice University
James M. Tour: Rice University

Nature Communications, 2022, vol. 13, issue 1, 1-12

Abstract: Abstract High-surface-area α-Al2O3 nanoparticles are used in high-strength ceramics and stable catalyst supports. The production of α-Al2O3 by phase transformation from γ-Al2O3 is hampered by a high activation energy barrier, which usually requires extended high-temperature annealing (~1500 K, > 10 h) and suffers from aggregation. Here, we report the synthesis of dehydrated α-Al2O3 nanoparticles (phase purity ~100%, particle size ~23 nm, surface area ~65 m2 g−1) by a pulsed direct current Joule heating of γ-Al2O3. The phase transformation is completed at a reduced bulk temperature and duration (~573 K,

Date: 2022
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DOI: 10.1038/s41467-022-32622-4

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