Performance of inkjet-printed strain sensor based on graphene/silver nanoparticles hybrid conductive inks on polyvinyl a
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Performance of inkjet-printed strain sensor based on graphene/silver nanoparticles hybrid conductive inks on polyvinyl alcohol substrate Y. Z. N. Htwe1 · I. N. Hidayah1 · M. Mariatti1 Received: 2 March 2020 / Accepted: 25 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Recently, there have been considerable interests in strain sensors that are flexible and stretchable, due to their potential for use in wearable electronics applications. Herein, a facile approach has been employed to produce synergistic strain sensor, taking advantage of the salient properties of hybrid conductive inks produced from graphene and silver nanoparticles (AgNPs). The hybrid ink was inkjet-printed on a polyvinyl alcohol (PVA) substrate. The effect of factors such as amount of graphene, annealing time and printing cycle on the performance of the hybrid conductive ink was investigated. The results showed that an increase in the amount of graphene from 0.1 to 0.5 wt% produced about 90% enhancement in the electrical conductivity of the hybrid ink. However, the change in electrical conductivity values of the hybrid ink at 0.5 wt% and 0.7 wt% graphene content is negligible. On the other hand, it was observed that the electrical conductivity was notably influenced by the number of printing cycle, as well as the annealing time. Significantly, the sensitivity performance of the printed hybrid graphene/AgNPs strain sensor is higher than that of individual graphene and AgNPs printed strain sensors under the strain range up to 20%.
1 Introduction There has been a recent advancement in the field of electronic devices and this had invariably expanded the scope of flexible electronics. In previous times, flexible electronics basically refer to the flexible, stretchable and foldable storage devices which are presently giving way to the more recent wearable and stretchable devices which are more advanced. Unfortunately, the operational scope of this set of recent electronic devices extends beyond the conventional material-based electronics which are significantly rigid [1]. Among the various wearable sensors, there has been a growing interest in the strain sensors in fields such as robotics, automotive and medicine. Particularly in medicine, they can be used for monitoring blood pressure, shape, force, strain and stress [2]. However, it has been observed that most of the conventionally fabricated strain sensors are generally too rigid with very low flexibility. This often results in undesirable separation between the sensor and the medium * M. Mariatti [email protected] 1
School of Materials and Mineral Resources Engineering, University Sains Malaysia, 14300, Engineering Campus, Nibong Tebal, Pulau Pinang, Malaysia
or substance that is being monitored [3]. Invariably, these devices could be damaged and as such, the results obtained from them are highly unreliable. As such, fabrication of flexible strain sensors through printing is being considered as a potential approach to overcome the peculiar shortcoming of
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