Abstract
In this work, wearable resistive gas sensors based on hybrid graphene/zinc oxide (ZnO) nanocomposites were fabricated on a flexible cotton fabric and employed to monitor odorless and colorless carbon monoxide (CO). Dip-coating and chemical bath deposition (CBD) was used to deposit the graphene layer and grow the ZnO nanorods, respectively. The films were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-Ray diffraction (XRD) to investigate their morphological structures, elemental composition, and crystal phase, respectively. Those characterizations were also confirming the growth of ZnO nanorods on the already-deposited graphene layer on fabrics. From the gas sensor measurements at room temperature, it was revealed that these graphene/ZnO nanocomposites were highly sensitive and selective towards CO gas at low concentration down to 10 ppm. The shortest response and recovery times of the sensors were measured to be 280 s and 45 s, respectively. Moreover, in comparison to bare graphene sensors, the surface modification by ZnO nanorods could obviously enhance the sensing response by up to 40% (i.e., doubled sensitivity). These flexible hybrid sensors are therefore expected to be a promising alternative for the existing rigid CO sensors in the market by offering unique nanostructures, low-cost fabrication, high flexibility, and good sensing performances.
Highlights
Nowadays, air pollution has been considered as one of the major concerns in modern societies because it causes highly widespread damage to the environment and adverse health effect to humans
The conditions of the sample during device processing are depicted in Fig. 1(b) where the color of fabrics was changing from white to black after its surfaces have been modified with graphene
Wearable carbon monoxide (CO) gas sensors based on heterostructure graphene/zinc oxide (ZnO) nanorods on cotton fabrics have been realized using low-cost and low-temperature wet chemical deposition methods
Summary
Air pollution has been considered as one of the major concerns in modern societies because it causes highly widespread damage to the environment and adverse health effect to humans. We report on the fabrication and characterization of wearable gas sensors based on graphene/ZnO composites grown on cotton fabrics via wet solution-based methods.
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