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Issue 16, 2015

Taking a hard line with biotemplating: cobalt-doped magnetite magnetic nanoparticle arrays

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Abstract

Rapid advancements made in technology, and the drive towards miniaturisation, means that we require reliable, sustainable and cost effective methods of manufacturing a wide range of nanomaterials. In this bioinspired study, we take advantage of millions of years of evolution, and adapt a biomineralisation protein for surface patterning of biotemplated magnetic nanoparticles (MNPs). We employ soft-lithographic micro-contact printing to pattern a recombinant version of the biomineralisation protein Mms6 (derived from the magnetotactic bacterium Magnetospirillum magneticum AMB-1). The Mms6 attaches to gold surfaces via a cysteine residue introduced into the N-terminal region. The surface bound protein biotemplates highly uniform MNPs of magnetite onto patterned surfaces during an aqueous mineralisation reaction (with a mean diameter of 90 ± 15 nm). The simple addition of 6% cobalt to the mineralisation reaction maintains the uniformity in grain size (with a mean diameter of 84 ± 14 nm), and results in the production of MNPs with a much higher coercivity (increased from ≈156 Oe to ≈377 Oe). Biotemplating magnetic nanoparticles on patterned surfaces could form a novel, environmentally friendly route for the production of bit-patterned media, potentially the next generation of ultra-high density magnetic data storage devices. This is a simple method to fine-tune the magnetic hardness of the surface biotemplated MNPs, and could easily be adapted to biotemplate a wide range of different nanomaterials on surfaces to create a range of biologically templated devices.

Graphical abstract: Taking a hard line with biotemplating: cobalt-doped magnetite magnetic nanoparticle arrays

Supplementary files

Article information


Submitted
28 Jan 2015
Accepted
21 Mar 2015
First published
23 Mar 2015

Nanoscale, 2015,7, 7340-7351
Article type
Paper
Author version available

Taking a hard line with biotemplating: cobalt-doped magnetite magnetic nanoparticle arrays

S. M. Bird, J. M. Galloway, A. E. Rawlings, J. P. Bramble and S. S. Staniland, Nanoscale, 2015, 7, 7340 DOI: 10.1039/C5NR00651A

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