Different Types of Partially Reduced Graphene Oxide as Mild Heat Sensors for Medical Applications

Graphene oxide suspension was spin-coated on a glass substrate and reduced at 300 °C in vacuum to produce partially reduced graphene oxide (PRGO) thin film, which was used as a temperature sensor device. The PRGO film showed high-temperature dependent resistance coefficient of Kilo ohms per degree. Nevertheless, it failed in the test of durability and stability along with many cycles. On the other hand, polymethacrylate encapsulated PRGO (PMMA-PRGO) thin film to form a compact structure. Hence, it overcomes the bare film drawbacks and featured much better durability and reversibility with rather relatively low resistance. Observed temperature limits, IV curves perturbation and irreversibility were discussed. Polymer encapsulation process proved efficacious in enhancing even PRGO non-steady structure as a p-type semiconductor. Besides, it promotes functionalization of several degrees of reduced graphene oxide GO for relevant electronic applications. On sensing terms, PMMA-PRGO not only presented hundreds of ohms for each one degree but also symmetrical liner drop over temperature that makes it a promising within mild range. This work suggests a simple technique to produce stable RGO based electronics as a semiconductor of reduction dependent bandgap.