Purpose – A new simple technique was developed to synthesize graphene film on flexible Poly-
ethylene Terephthalate (PET) substrate and applied as a strain sensor.
Design/methodology/approach – Graphene film was synthesized using Laser treatment of
graphene oxide (GO) film deposited on PET substrate. A universal Laser system was used to
simultaneously reduce and pattern the GO film into Laser Reduced Graphene Oxide (LRGO)
film.
Findings – The Laser treatment synthesizes a multilayer graphene film with overlapped flakes,
which shows structure integrity, mechanical flexibility and electrical conductivity of 1.33 x 10
3

S/m. The developed LRGO/PET film was used to fabricate a high sensitivity strain sensor. The
sensitivity and temperature dependency of its gauge factor (GF) was examined at applied strains
up to 0.25% and operating temperatures up to 80
o
C. The fabricated sensor shows stable GF of ~
78 up to 60
o
C

with standard error of the mean not exceed ± 0.2.
Originality/value – The proposed method offers a new simple and productive technique to
fabricate large-scale graphene-based flexible devices at a low cost.