Figure 4
From: Graphene-coated microballs for a hyper-sensitive vacuum sensor
The device structure used to measure the sensor activity of a single ball and to test its reproducibility. (a) Microscopic images of the device used to test sensor activity (with and without a single ball). (b) Reproducibility test results using the device at 100 °C, (c) 120 °C, and (d) 150 °C (logarithmic scale).
