Microtwinning in template-synthesized single-crystal metal nanowires

Jinguo Wang, Mingliang Tian, Thomas E. Mallouk, Moses H.W. Chan

Research output: Contribution to journalArticlepeer-review

152 Scopus citations

Abstract

Twinning is one of the most popular planar defects in nanocrystals, and it is frequently observed in face-centered cubic (fcc) structured metallic nanocrystals. In this study, copper, silver, and gold nanowires with diameters of 30-50 nm were prepared by electrochemical deposition in "track-etched" polycarbonate membranes. High-resolution transmission electron microscopy (HRTEM) and electron diffraction were used to study the microstructure of the nanowires. Microtwins were observed to be dependent on growth orientation in the single-crystal metal (copper, silver, and gold) nanowires. In single-crystal nanowires with a [111] growth orientation, both primary (111)[112̄] and secondary (1̄1̄1)[112] twins were observed, whereas in the wires with a [112̄] growth orientation, lengthwise twins and stacking faults were the dominant features. No twinning was observed in nanowires that grew along the [100] and [110] directions. The crystallography of the twins was characterized by HRTEM and electron microdiffraction. The twinning mechanism (nucleation and growth) is discussed in relation to a two-dimensional (2D) nucleation and growth mechanism for the single-crystal nanowires.

Original languageEnglish (US)
Pages (from-to)841-845
Number of pages5
JournalJournal of Physical Chemistry B
Volume108
Issue number3
DOIs
StatePublished - Jan 22 2004

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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