Water-based chitosan/reduced graphene oxide ink for extrusion
Alireza Sanati , Elham Bidram , Ali Poursamar , Mohsen Rabbani , Mohammad Rafienia
Biosensor Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
Department of Biomaterials, Nanotechnology, and Tissue Engineering, School of Advanced Technologies in Medicine, Isfahan University of Medical
Sciences, Isfahan, Iran
Abstract
Recently, developing appropriate printing techniques and conductive inks has received considerable attention in the field of (bio)sensors.
Extrusion printing technology is an interesting alternative to conventional screen-printing for making flexible and disposable electronics due to
its special features such as, direct printing, easy control of design, and manufacturing processes. Moreover, fabricating highly dispersed and
stable graphene inks with appropriate conductivity and printability is always a challenge in (bio)sensors. Here, a water-based chitosan/reduced
graphene oxide (CS/rGO) ink was obtained using extrusion printing to make conductive electrodes on paper. CS/GO ratio of 0.2 showed the best
stability, electrochemical performance and hydrophilicity (water contact angle of 85° ± 6). The resulting sensor was a simple two-electrode
device based on the chronoamperometry technique, representing a good potential for detecting glucose in the linear range of 0.5 to 4mM and
with a limit of detection (LOD) of 0.45mM (S/N=3). Furthermore, this non-enzymatic sensor showed proper selectivity against interfering
substances, as well as an excellent stability during 28days (2.9% response fall). Ultimately, the developed conductive ink can be considered as an
innovative material with high stability and dispersivity of rGO for the future studies on disposable (bio)sensors and flexible electronics