Growth of hematite nanowire arrays during dense pentlandite oxidation

Zhu, Huihui and Deng, Jinxia and Chen, Jun and Yu, Ranbo and Xing, Xianran (2014) Growth of hematite nanowire arrays during dense pentlandite oxidation. Journal of Materials Chemistry A, 2 (9). pp. 3008-3014. ISSN 2050-7488

Abstract

A simple synthesis method is proposed for producing aligned and uniform single-crystal one-dimensional hematite (α-Fe2O3) nanostructures on pentlandite. Pentlandite is the most common terrestrial iron-nickel sulfide and the principal ore mineral of nickel. In this study, a pentlandite sample was synthesized from pure components Fe, Ni and S. Oxidation makes the chemical potential of iron reduce more than that of nickel. Iron migrated rapidly to the surface of dense pentlandite and was oxidized preferentially to form an oxide layer. Several micrometers long α-Fe 2O3 nanowires grown along the [110] direction were achieved. The ordered oxygen vacancies which lie parallel to the growth direction were observed. Hematite (α-Fe2O3) and magnetite including Ni (NixFe3-xO4) are major components of the oxide layer. Three kinds of morphology are included in this layer: nanowires, dense and porous oxides. The Ni-rich pentlandite coexists with NiS, hexagonal pyrrhotite (Fe1-xS) and/or godlevskite (Ni 7S6). This work provides a new strategy to inexpensively and efficiently synthesize nanostructures directly from ore minerals.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version cannot be displayed due to copyright restrictions.
Faculty / Department / School: No Faculty
Date Deposited: 14 Sep 2017 01:20
Last Modified: 14 Sep 2017 01:20
Uncontrolled Keywords: growth directions; iron-nickel; nanowire arrays; ore minerals; porous oxides; pure components; synthesis method; minerals; iron; nickel; nanotechnology; chemical reactions; solid state physics
Fields of Research : 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030306 Synthesis of Materials
03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030302 Nanochemistry and Supramolecular Chemistry
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Identification Number or DOI: 10.1039/c3ta14832g
URI: http://eprints.usq.edu.au/id/eprint/31956

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