Orientation and morphology of Pt nanoparticles in γ-alumina processed via ion implantation and thermal annealing

SCRIPTA MATERIALIA

卷:188

Article

Clauser, Arielle L.¹  Giulian, Raquel²  McClure, Zachary D.^3,5,6  Sarfo, Kofi Oware³  Ophus, Colin⁴  Ciston, Jim⁴  Arnadottir, Liney³  Santala, Melissa K.¹ 

[1] Oregon State Univ, Sch Mech Ind & Mfg Engn, 204 Rogers Hall, Corvallis, OR 97331 USA

[2] Univ Fed Rio Grande do Sul, Inst Phys, Porto Alegre, RS, Brazil

[3] Oregon State Univ, Sch Chem Biol & Environm Engn, Corvallis, OR 97331 USA

[4] Lawrence Berkeley Natl Lab, Mol Foundry, Natl Ctr Electron Microscopy, Berkeley, CA USA

[5] Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA

[6] Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA

关键词: Crystalline oxides;    Platinum;    Interfaces;    Nanoparticle morphology;    Transmission electron microscopy;   

DOI  :  10.1016/j.scriptamat.2020.06.058

来源: Elsevier

【 摘 要 】

Structure and chemistry of metal/metal-oxide interfaces are critical for many catalytic processes and sensing. Pristine interfaces of Pt and gamma-Al2O3 were fabricated using high-energy ion implantation and thermal processing. Amorphous regions of alumina develop in single crystal alpha-alumina during Pt+ implantation and an 800 degrees C thermal treatment crystalizes amorphized alumina to gamma-Al2O3 and allows Pt ions to precipitate within the developing gamma-alumina, yielding Pt nanoparticle tetrahedra terminated by {111} surfaces. The phase of alumina that developed and the distribution, morphology, and orientation of Pt nanoparticles was determined using x-ray diffraction, Rutherford backscattering spectrometry, transmission electron microscopy and scanning transmission electron microscopy. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free