▎ 摘　　要

We report thermal behavior of reduced graphene oxide (rGO) as temperature sensor patterned on a ready-made printed circuit board (PCB). Solution-processable graphene oxide (GO) was drop-casted and reduced by photothermal laser irradiation directly on PCBs. Laser irradiation adjusted for appropriate light power reduced GO without destroying electrode patterns and electronic components in PCBs, causing rGO to become a negative thermal coefficient of resistance (TCR). The rGO sensor with electrodes improved contact resistance showed 46% temperature variation from -10 degrees C to 90 degrees C. Furthermore, the rGO sensor was fabricated between analogue pin electrodes of commercial Arduino PCBs to measure temperature. An Arduino system showed 13.1% sensitivity to temperature variation from -10 degrees C to 50 degrees C detected at the analogue input pin of rGO sensor.