Solution-Processed Conductive Biocomposites Based
on Polyhydroxybutyrate and Reduced Graphene Oxide
Version 2 2018-07-18, 18:36
Version 1 2018-07-18, 18:33
Posted on 2018-07-18 - 18:36
Graphenic
material/biopolymer nanocomposites have attracted attention
for use in next generation flexible and degradable electronics. However,
achieving high electrical conductivity (above 10 S/m) and favorable
mechanical properties in such materials remains a challenge. In this
work, reduced graphene oxide (rGO)/polyhydroxybutyrate (PHB) films
were both prepared from solution. The following three reducing agents
were investigated: sodium borohydride, hydrazine, and l-ascorbic
acid. For the first two reducing agents (sodium borohydride and hydrazine),
GO was first reduced and then added to the dissolved PHB, whereas
for the third reducing agent (l-ascorbic acid) an in situ
reduction was performed. We systematically investigated the effects
of the three reducing agents by comparing their reduction efficiency,
the residual functional groups presented on the GO, and the properties
of the resulting composites of all the composites, reduction by l-ascorbic acid gives the lowest electrical percolation threshold
(∼1 wt %) and the highest electrical conductivity (30 S/m on
8 wt % loading). This conductivity value is on par with the highest
known values for rGO/biopolymer composites. The mechanical properties
of the composites were characterized; the ultimate tensile stress
and Young’s modulus of the 4 wt % composites formed with rGO
reduced using either hydrazine or l-ascorbic acid were higher
than that for pure PHB. A strain sensor was demonstrated using these
composites.
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Dan, Li; Pope, Michael A.; Elias, Anastasia L. (2018). Solution-Processed Conductive Biocomposites Based
on Polyhydroxybutyrate and Reduced Graphene Oxide. ACS Publications. Collection. https://doi.org/10.1021/acs.jpcc.8b02515
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AUTHORS (3)
LD
Li Dan
MP
Michael A. Pope
AE
Anastasia L. Elias