Conductive gels based on modified agarose embedded with gold nanoparticles and their application as a conducting support for Shewanella oneidensis MR-1

Sindhu Krishna Suravaram, David Kelham Smith, Alison Parkin, Victor Chechik

Research output: Contribution to journalArticlepeer-review


Shewanella oneidensis is an electrogenic microbe which
could be more widely applied in biosensing and fuel cell applications
if better methods existed to promote electrode-biofilm formation. This
paper reports a simple procedure that converts agarose, a cheap and
readily available polymer, into a modified “MAgarose” material which
will form biocompatible hydrogels that embed gold nanoparticles
(AuNPs) along the fibers to yield a composite material with a
conductivity ca. 80 times higher than an unmodified agarose-AuNP
gel. Proof-of-concept bioelectrochemical experiments using
Shewanella oneidensis show that when these MAgarose-AuNP gels
are used to coat carbon veil there is a 10-fold increase in oxidative
microbial current production when tested in a 3-electrode cell set-up.
Microscopy results show that this can be attributed to the ability of the
composite hydrogel to support MR-1 growth throughout the 3D matrix.
Original languageEnglish
Pages (from-to)5876-5879
Number of pages4
Issue number23
Early online date19 Nov 2019
Publication statusPublished - 23 Dec 2019

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