Issue 33, 2019

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

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

Supplementary files

Article information

Article type
Paper
Submitted
04 Jun 2019
Accepted
16 Jul 2019
First published
17 Jul 2019

New J. Chem., 2019,43, 12923-12931

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, 43, 12923 DOI: 10.1039/C9NJ02903F

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