  We demonstrate the excellent temperature sensing property of a chemically
synthesized reduced graphene oxide (rGO). It is found that with increase in
temperature from 80 to 375K, the resistivity of reduced graphene oxide
monotonically decreases. The ultra-fast temperature sensing property is
demonstrated by keeping and removing a block of ice under the rGO sensor, which
shows the resistance of rGO increases by 15% in 592 miliseconds and recovers in
8.92 seconds. The temperature sensing of rGO is compared with a standard
platinum thermo sensor (Pt 111) and found the sensitivity is much better in
rGO.
