Dynamic Response of The Graphene Gas Sensors Towards CO, H2 And NH3 Gases At Different Temperatures

International Semiconductor Science and Technology Conference, Turkey, 1 - 04 December 2013, pp.35, (Full Text)

Graphene has been considered as an excellent candidate for future electronics because of

its extraordinary mechanical [1, 2-4] electrical [1, 5-8] and thermal [9] properties. Gas sensing is

one of the most promising applications for graphene because of its huge surface area and its

extremely high carrier mobility [10, 11]. In this study, we studied dynamic response of the

graphene field effect transistor (GFET) gas sensors towards carbon monoxide (CO), hydrogen

(H2) and ammonia (NH3) gases at different temperatures. The electrical characterizations of the

fabricated backgate graphene transistors were made under 3.0 x 10-5 mbar vacuum environment

using Keithley 2612A source meter (200V, 10A Pulse). We demonstrate that graphene field effect

gas sensors can detect gas molecules at extremely low concentrations at room temperature and two

different temperatures, namely 90 0C and 120 0C. The detection limits depending on temperature

have been measured.