Synthesis of graphene oxide and its gas sensing properties to NH3

Graphene have attracted wide attention for its unique characteristics(e.g.electronic,thermal,mechanical etc.).Graphene oxide not only possesses the intrinsic properties of graphene but also contains many oxygen-containing functional groups such as hydroxyl,epoxy,carboxyl and carbonyl groups.Those oxygen-containing functional groups may improve the adsorbability of graphene oxide to gases which is advantageous for its gas sensing properties.In this investigation,graphene oxide was synthesized by a modified Hummer's method.The gas sensing properties of the as-prepared graphene oxide to NH3was then investigated.The results indicate that graphene oxide exhibited excellent sensitivities to NH3 with a well linearly relationship ranging from 1.5×10-4 to 3.5×10-4.