Aberration corrected and 3D cryo-tomography HAADF-STEM surface studies of ZnO tetrapods

M. R. Ward, H. Sugiura, K. Yoshida, N. Tanaka, P. L. Gai, E. D. Boyes

Research output: Contribution to journalConference article

Abstract

We present a morphology study of ZnO tetrapods using aberration corrected TEM, HAADF-STEM and 3D HAADF-STEM cryotomography as an alternative to more conventional TEM and SEM techniques. We use 3D IMOD reconstructions to show that the {11̄0} facets dominate the total surface area of uniform hexagonal prism tetrapods. Using HRTEM we show that the small tetrapods have a zincblende phase core from which the four legs extend. The facets and the edges of these legs were found to be atomically clean and flat with the potential for ZnO tetrapods as model substrates. We deposited ultrafine Pt/Pd nanoparticles onto the tetrapods and investigated the resulting morphologies. We found using HAADF-STEM cryotomography and reconstruction techniques that the nanoparticle coverage gave separate nanoparticles and overall uniform coverage. We believe these techniques and the results from them could be useful for the development of nanoparticle-ZnO tetrapod composite systems with applications in optoelectronics, gas sensing and catalysis.

Original languageEnglish
Article number012073
JournalJournal of Physics: Conference Series
Volume371
DOIs
Publication statusPublished - 2012 Jan 1
Externally publishedYes
EventElectron Microscopy and Analysis Group Conference 2011, EMAG 2011 - Birmingham, United Kingdom
Duration: 2011 Sep 62011 Sep 9

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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