氧化石墨烯的制备及其对NH_3的敏感特性研究

Synthesis of graphene oxide and its gas sensing properties to NH_3

石墨烯独特的原子结构赋予其电学、热学、力学等方面的优异性能,在诸多领域具有广泛的应用。氧化石墨烯不仅具有石墨烯结构特点,而且具有大量的含氧官能团,增强了对气体的吸附能力,更适合应用于气敏传感器。通过改进的Hummer方法制备了片状多层氧化石墨烯,并对不同浓度的NH3进行敏感特性测试。结果表明氧化石墨烯对NH3具有良好的响应,在(1.5～3.5)×10-4范围内呈线性关系。

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 oxygencontaining 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.