Reduced graphene oxide for room-temperature gas sensors

We demonstrated high-performance gas sensors based on graphene oxide (GO) sheets partially reduced via low-temperature thermal treatments. Hydrophilic graphene oxide sheets uniformly suspended in water were first dispersed onto gold interdigitated electrodes. The partial reduction of the GO sheets was then achieved through low-temperature, multi-step annealing (100, 200, and 300 degrees C) or one-step heating (200 degrees C) of the device in argon flow at atmospheric pressure. The electrical conductance of GO was measured after each heating cycle to interpret the level of reduction. The thermally-reduced GO showed p-type semiconducting behavior in ambient conditions and was responsive to low-concentration NO2…

• NS
  National Science Foundation
• DO
  Division of Chemical, Bioengineering, Environmental, and Transport Systems
• DO
  Division of Civil, Mechanical and Manufacturing Innovation
• BE
  Basic Energy Sciences
• AN
  Argonne National Laboratory