Jump to main content
Jump to site search


Direct growth of oriented nanocrystals of gamma-iron on graphene oxide substrates. Detailed analysis of the factors affecting unexpected formation of the gamma-iron phase

Author affiliations

Abstract

In bulk, face-centered gamma-iron exists only at temperatures above 917 °C, returning back to body-centered alpha-iron upon cooling below this temperature. In this work, we report formation of the gamma-iron phase at temperatures significantly lower than the 917 °C threshold in the form of nanoparticles. Moreover, the as-grown nanoparticles have specific orientation along the (002) plane as the result of the templating effect of the graphene oxide substrate. Also, we provide a complete account of the factors responsible for the formation of the gamma-phase. Namely, we demonstrate the role of the type of carbon substrate, and the effect of the temperature and time of annealing and the graphene oxide/iron ion ratio. We demonstrate that the gamma-phase is not formed when using three-dimensional forms of carbon, elucidating the “magic” role of graphene oxide in this process.

Graphical abstract: Direct growth of oriented nanocrystals of gamma-iron on graphene oxide substrates. Detailed analysis of the factors affecting unexpected formation of the gamma-iron phase

Back to tab navigation

Supplementary files

Publication details

The article was received on 04 Jun 2019, accepted on 16 Jul 2019 and first published on 17 Jul 2019


Article type: Paper
DOI: 10.1039/C9NJ02903F
New J. Chem., 2019, Advance Article

  •   Request permissions

    Direct growth of oriented nanocrystals of gamma-iron on graphene oxide substrates. Detailed analysis of the factors affecting unexpected formation of the gamma-iron phase

    A. Khannanov, A. Kiiamov, A. Valimukhametova, F. G. Vagizov and A. M. Dimiev, New J. Chem., 2019, Advance Article , DOI: 10.1039/C9NJ02903F

Search articles by author

Spotlight

Advertisements