▎ 摘　　要

In this study, the hydrogen gas (H-2) sensing mechanism of suspended graphene (Gr)/ Poly(3,4-ethylene dioxythiophene): Poly(styrene sulfonate) - Polyethylene oxide (PEDOT: PSS-PEO) composite nanoscale channels precisely patterned with near-field electrospinning is investigated. Suspended Gr/PEDOT: PSS-PEO nanoscale channels not only have a higher surface-to-volume ratio for easy diffusion in/out of the composite but also show enhanced response due to effective charge transfer at the interface of suspended graphene and PEDOT: PSS-PEO nanofiber. A sensing response of 2% for 1 ppm of H-2 concentration with good linearity over a wide dynamic range is achieved. Arrays of nanoscale channels for enhanced sensitivity are also implemented and microheaters for effective and fast device recovery are integrated. Moreover, the sensor response is also characterized at various conditions such as channel materials and sizes, temperatures, and gas concentrations. The demonstrated performance, with low power consumption and small form factor, promises a facile and low-cost suspended graphene/PEDOT: PSS-PEO sensor solution with enhanced sensitivity.