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

TY - JOUR

T1 - Conductive gels based on modified agarose embedded with gold nanoparticles and their application as a conducting support for Shewanella oneidensis MR-1

AU - Suravaram, Sindhu Krishna

AU - Smith, David Kelham

AU - Parkin, Alison

AU - Chechik, Victor

N1 - © 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

PY - 2019/12/23

Y1 - 2019/12/23

N2 - Shewanella oneidensis is an electrogenic microbe whichcould be more widely applied in biosensing and fuel cell applicationsif better methods existed to promote electrode-biofilm formation. Thispaper reports a simple procedure that converts agarose, a cheap andreadily available polymer, into a modified “MAgarose” material whichwill form biocompatible hydrogels that embed gold nanoparticles(AuNPs) along the fibers to yield a composite material with aconductivity ca. 80 times higher than an unmodified agarose-AuNPgel. Proof-of-concept bioelectrochemical experiments usingShewanella oneidensis show that when these MAgarose-AuNP gelsare used to coat carbon veil there is a 10-fold increase in oxidativemicrobial current production when tested in a 3-electrode cell set-up.Microscopy results show that this can be attributed to the ability of thecomposite hydrogel to support MR-1 growth throughout the 3D matrix.

AB - Shewanella oneidensis is an electrogenic microbe whichcould be more widely applied in biosensing and fuel cell applicationsif better methods existed to promote electrode-biofilm formation. Thispaper reports a simple procedure that converts agarose, a cheap andreadily available polymer, into a modified “MAgarose” material whichwill form biocompatible hydrogels that embed gold nanoparticles(AuNPs) along the fibers to yield a composite material with aconductivity ca. 80 times higher than an unmodified agarose-AuNPgel. Proof-of-concept bioelectrochemical experiments usingShewanella oneidensis show that when these MAgarose-AuNP gelsare used to coat carbon veil there is a 10-fold increase in oxidativemicrobial current production when tested in a 3-electrode cell set-up.Microscopy results show that this can be attributed to the ability of thecomposite hydrogel to support MR-1 growth throughout the 3D matrix.

U2 - 10.1002/celc.201901618

DO - 10.1002/celc.201901618

M3 - Article

SN - 2196-0216

VL - 6

SP - 5876

EP - 5879

JO - ChemElectroChem

JF - ChemElectroChem

IS - 23

ER -