Research of the multifunctional rGO/MoS2 material in the sensing field: Human breathing and Hg(II) pollution detection

Abstract 2D materials have many advantages in manufacturing sensors due to their high surface-volume ratio, rich electrochemically active sites, and other unique performances. This paper prepared rGO/MoS2 composites with annealed reduced graphene oxide (rGO) and MoS2 by ultrasonic method. Their response discussed including electrical signal changes of non-contact human body sensing and heavy metal ion detection. The rGO/MoS2 composites ink was sprayed on the flexible PET substrate to fabricate a sensor. Its responses to exhaled gas and non-contact finger reached up to 1500% and 5400% in a 52% humidity environment respectively. For heavy metal ions in water, the minimum detection concentration limit of Hg (II) in water reached 1 nM. This work shows that the rGO/MoS2 composites are promising materials to develop flexible sensors for the detection of non-contact creatures and heavy metal pollution.